pilot add max thurst security

I start to use more SFML feature to avoid recomputing the zoom myself.
I still needs it to compute the coordinates of the grid however.

Sources:
- https://www.sfml-dev.org/tutorials/2.5/graphics-transform.php
- https://oprypin.github.io/crsfml/tutorials/graphics/vertex-array.html

spec/engine/vector_spec.cr

@@ -137,7 +137,7 @@ describe Vector do
     Vector[1, 1].magnitude.should eq(Math.sqrt(2))
     Vector[1, 2].magnitude.should eq(Math.sqrt(1**2 + 2**2))
     Vector[2, 2].magnitude.should eq(Math.sqrt(2**2 + 2**2))
-    Vector[2, 2, 2].magnitude.should eq((2**2 + 2**2 + 2**2)**(1.0/3.0))
+    Vector[2, 2, 2].magnitude.should eq((2**2 + 2**2 + 2**2)**(1.0/2.0))
   end
 
   it "normalized vector" do

src/engine/projectable.cr

@@ -27,19 +27,19 @@ class Projectable(N)
     @gravity_body.speed
   end
 
-  def sf_shape(coef : Float64 = 1.0, offset : Vector(Float64, N) = Vector(Float64, N).zero)
+  def sf_shape(offset : Vector(Float64, N) = Vector(Float64, N).zero)
     shape = SF::CircleShape.new(@size)
     shape.fill_color = SF.color(@color[0], @color[1], @color[2])
 
     shape.outline_thickness = @outline_size
     shape.outline_color = SF.color(@outline_color[0], @outline_color[1], @outline_color[2])
-    shape.position = sf_position(coef, offset)
+    shape.position = sf_position(offset)
     shape
   end
 
   # the sf_position is the projected position of the gravity_body on the graphic plan
-  def sf_position(coef : Float64 = 1.0, offset : Vector(Float64, N) = Vector(Float64, N).zero)
-    zoomed_position = @gravity_body.position * coef + offset
+  def sf_position(offset : Vector(Float64, N) = Vector(Float64, N).zero)
+    zoomed_position = @gravity_body.position + offset
     SF.vector2(zoomed_position[0], zoomed_position[1])
   end
 end

src/engine/vector.cr

@@ -169,13 +169,16 @@ class Vector(T, N) # should be a struct since it's a simple pointer inside, the
     T
   end
 
-  # I think it's always square root not 1.0/size
   def magnitude : Number
-    reduce(T.zero) { |base, elem| base + elem**2 } ** (1.0 / size)
+    reduce(T.zero) { |base, elem| base + elem**2 } ** (1.0 / 2.0)
+  end
+
+  # put the vector on a trigonomic circle so sqrt(x**2 + y**2) = 1
+  def normalize
+    self / magnitude
   end
 
   def normalize
-    magnitude = self.magnitude
-    self / magnitude
+    self.div!(magnitude)
   end
 end

src/engine/vessel.cr

@@ -84,6 +84,7 @@ class Vessel(N)
       orders.sort!
       order = orders.pop # remove last order and execute it
       order.execute
+      # orders.unshift order if order.keep
       order
     end
   end
@@ -102,8 +103,9 @@ class Vessel(N)
   class Order(N)
     setter :station
     getter :priority, :group
+    # property :keep
 
-    def initialize(@priority : Int32 = 0, @group : Symbol = :default, @station : Station(N)? = nil, &@block : Order(N) -> Nil)
+    def initialize(@priority : Int32 = 0, @group : Symbol = :default, @station : Station(N)? = nil, @keep : Bool = false, &@block : Order(N) -> Nil)
     end
 
     def to_s(io : IO) : Nil
@@ -139,60 +141,112 @@ class Vessel(N)
   end
 
   class Pilot(N) < Station(N)
-    property low_thrust_save, low_thrust_pressed, computer_input_thurst
-    property permanent_mode, temporary_mode
+    # these properties handle manual override of trust (either analogic or exact computed)
+    property low_thrust_save, low_thrust_pressed, computer_input_thrust
+    # on the interface, the pilot can select a body to create relative vectors
+    property current_selected_body : Gravity::Body(N)?
+    # this is a hard limit for thrust so the pilot can avoid killing all the people aboard
+    property max_thrust
+    # permanent mode is the default modes to apply at all time
+    property permanent_modes : Array(Mode)
+    # temporary mode must be set at each tick and will be reset each time it is applied
+    property temporary_modes : Array(Mode)
 
-    @permanent_mode : Symbol?
-    @temporary_mode : Symbol?
+    enum Mode
+      Constant
+      Pulse
+      AntiGrav
+      AntiSpeed
+    end
 
     def initialize(*p, **o)
       super
-      @permanent_mode = nil
-      @temporary_mode = nil
+      @permanent_modes = Array(Mode).new
+      @temporary_modes = Array(Mode).new
       @low_thrust_save = 0.0
       @low_thrust_pressed = false
-      @computer_input_thurst = Vector(Float64, N).zero
+      @computer_input_thrust = Vector(Float64, N).zero
+      @max_thrust = 20.0
+      @current_selected_body = nil
     end
 
-    def set_exact_acceleration_axis!(index : Int32, value : Float64)
+    # Modify immediatly one elemnt of the acceleration vector
+    def set_exact_acceleration_axis(index : Int32, value : Float64)
       vessel.gravity_body.acceleration[index] = value
     end
 
-    def set_exact_acceleration_axis!(axis : Vector(Float64, N))
+    # Modify immediatly the acceleration vector
+    def set_exact_acceleration_axis(axis : Vector(Float64, N))
       axis.each_with_index do |value, index|
-        set_exact_acceleration_axis!(index, value)
+        set_exact_acceleration_axis(index, value)
       end
     end
 
-    #     set_exact_acceleration_axis!({0, 23.0}, {1, 11.2}) # to set x;y at once
-    def set_exact_acceleration_axis!(*tuples : Array(Tuple(Int32, Float64)))
+    #     set_exact_acceleration_axis({0, 23.0}, {1, 11.2}) # to set x;y at once
+    def set_exact_acceleration_axis(*tuples : Array(Tuple(Int32, Float64)))
       tuples.each do |tuple|
-        set_exact_acceleration_axis!(*tuple)
+        set_exact_acceleration_axis(*tuple)
+      end
+    end
+
+    def immediate_modes : Array(Mode)
+      if !@temporary_modes.empty?
+        @temporary_modes
+      else
+        @permanent_modes
       end
     end
 
     def apply_current_mode
-      if (@permanent_mode == :antigrav && @temporary_mode.nil?) || @temporary_mode == :antigrav
-        # somehow it doesn't work as expected... :thinking:
-        set_exact_acceleration_axis!(-vessel.gravity)
+      new_acceleration_axis = Vector(Float64, N).zero
+      must_update_acceleration_axis = false
+      if immediate_modes.includes?(Mode::AntiGrav)
+        must_update_acceleration_axis = true
+        new_acceleration_axis.add!(-vessel.gravity)
       end
 
-      @temporary_mode = nil # each time we apply the temporary_mode, reset it
+      if immediate_modes.includes?(Mode::AntiSpeed)
+        must_update_acceleration_axis = true
+        reset_acceleration = true
+        if (current_selected_body = @current_selected_body)
+          relative_speed = vessel.gravity_body.speed - current_selected_body.speed
+          new_acceleration_axis.add!(-relative_speed)
+        end
+      end
+
+      if new_acceleration_axis.magnitude > @max_thrust
+        new_acceleration_axis.normalize.mult!(@max_thrust)
+      end
+      set_exact_acceleration_axis(new_acceleration_axis) if must_update_acceleration_axis
+
+      @temporary_modes.clear # each time we apply the temporary_mode, reset it
     end
 
     def accelerate_current_vector!(coef : Float64)
-      set_exact_acceleration_axis!(vessel.gravity_body.speed * coef)
+      set_exact_acceleration_axis(vessel.gravity_body.speed * coef)
     end
   end
 
   class Navigation(N) < Station(N)
+    class Cadran
+      property radius : Array(Float64)
+      def initialize(default_radius : Float64 = 1000.0)
+        @radius = [] of Float64
+        @radius << default_radius if !default_radius.nil?
+      end
+    end
+
     property zoom_select : Int32
     property zoom_position : Vector(Float64, N)
+    property cadran : Cadran
+    property zoom_ratio : Float64
 
     def initialize(*p, **o)
       super
+      @zoom_ratio = 1.0
       @zoom_select = 0
       @zoom_position = Vector(Float64, N).zero
+      @cadran = Cadran.new
     end
   end
 end

src/tests/physics_sandbox.cr

@@ -7,6 +7,8 @@ require "crsfml"
 require "imgui"
 require "imgui-sfml"
 
+require "./physics_sandbox/*"
+
 require "log"
 Log.setup(:debug)
 
@@ -20,26 +22,58 @@ class Game
   @window : SF::RenderWindow
   @delta_clock : SF::Clock
   @screen_center_position : Vector(Float64, 2)
+  @center_position : Vector(Float64, 2)
   @joystick_moved : Vector(Float64, 2)
 
-  ZOOM = 1/4
   SECOND_IN_NANO = 1_000_000_000
+  DEFAULT_ZOOM = 5/16
 
   def accuracy_frequency_nano_rate
     ((SECOND_IN_NANO * @timescale) // @framerate).to_u64
   end
 
+  def draw(item : SF::VertexBuffer, transform : SF::Transform? = nil)
+    states = SF::RenderStates.new
+    if transform
+      states.transform = transform
+    end
+    @window.draw(item, states)
+  end
+
+  def draw(item : SF::Shape, transform : SF::Transform? = nil)
+    states = SF::RenderStates.new
+    if transform
+      states.transform = transform
+    end
+    @window.draw(item, states)
+  end
+
+  def default_viewport
+    SF.float_rect(0.0, 0.0, 1.0, @width / @height)
+  end
+
   def initialize(@framerate : Int32 = 60, @width : Int32 = 800, @height : Int32 = 600)
     @window = SF::RenderWindow.new(
       SF::VideoMode.new(width, height),
       "Sandbox",
     )
+    @zoom = 1.0
     @joystick_moved = Vector[0.0, 0.0]
     @screen_center_position = Vector[width / 2, height / 2]
+    @center_position = Vector[0.0, 0.0]
+
     @delta_clock = SF::Clock.new
+    @time_passed = Time::Span.zero
+    @timescale = 1.0
+    @window_frequency = Time::Span.new(nanoseconds: SECOND_IN_NANO // @framerate)
+
     ImGui::SFML.init(@window)
     @window.framerate_limit = @framerate
-    @time_passed = Time::Span.zero
+
+    @view = SF::View.new
+    @view.viewport = default_viewport # SF.float_rect(0.0, 0.0, 1.0, @width / @height)
+    @view.center = {@center_position[0], @center_position[1]}
+    @window.view = @view
 
     # connected = SF::Joystick.connected?(0)
     # # How many buttons does joystick #0 support?
@@ -51,9 +85,6 @@ class Game
     # # What's the current position of the Y axis on joystick #0?
     # position = SF::Joystick.get_axis_position(0, SF::Joystick::Y)
 
-    @timescale = 1.0
-    @window_frequency = Time::Span.new(nanoseconds: SECOND_IN_NANO // @framerate)
-
     sun_offset = Vector[3*10.0**11, 3*10.0**11]
     @bodies = {
       vessel: Gravity::MovingBody(2).new(mass: 1.0, g: 0.1, position: Vector[10.0, 10.0]),
@@ -71,33 +102,34 @@ class Game
     @vessel_p = Projectable(2).new(
       gravity_body: @bodies[:vessel],
       color: {255, 0, 250},
-      size: 3,
+      size: 5,
     )
     @star = Projectable(2).new(
       gravity_body: @bodies[:star],
       color: {200, 200, 50},
-      size: 10,
+      size: 20,
     )
     @pla1 = Projectable(2).new(
       gravity_body: @bodies[:pla1],
       color: {150, 50, 50},
-      size: 5,
+      size: 10,
     )
     @pla2 = Projectable(2).new(
       gravity_body: @bodies[:pla2],
       color: {50, 50, 150},
-      size: 5,
+      size: 10,
     )
     @pla3 = Projectable(2).new(
       gravity_body: @bodies[:pla3],
       color: {50, 150, 50},
-      size: 5,
+      size: 10,
     )
     @projectables = {
       @star, @pla1, @pla2, @pla3, @star, @vessel_p,
     }
     @g = Gravity::Field(2).new(@gravited)
     @vessel = Vessel(2).new(name: "Starbird", gravity_body: @bodies[:vessel], gravity_field: @g)
+    @vessel.navigation.zoom_ratio = DEFAULT_ZOOM
     @timer = Physics::Tick::Timer.new
     @ui_events_handler = UI::EventHandler.new
   end
@@ -113,10 +145,10 @@ class Game
         @window.close
         exit
       when SF::Event::KeyPressed
-        puts "KeyPressed #{event}"
+        Log.debug "KeyPressed #{event}"
       when SF::Event::MouseMoved
       when SF::Event::MouseButtonEvent
-        puts "MouseButtonEvent #{event}"
+        Log.debug "MouseButtonEvent #{event}"
       when SF::Event::JoystickButtonPressed
         @joystick_moved.zero!              # reset 0
         joystick_moved_modified = :vector # force exact set
@@ -143,14 +175,14 @@ class Game
     end
 
     if joystick_moved_modified == :vector
-      @vessel.pilot.set_exact_acceleration_axis!(@joystick_moved)
+      @vessel.pilot.set_exact_acceleration_axis(@joystick_moved)
     elsif joystick_moved_modified == :accelerate
       # can double the vector each second
-      puts "accelerate #{@joystick_moved}"
+      Log.debug "accelerate #{@joystick_moved}"
       @vessel.pilot.accelerate_current_vector!(1.0 + (@joystick_moved[0] + 100) / 2 * 0.01)
     elsif joystick_moved_modified == :slow
       # can slow
-      puts "slow down #{@joystick_moved}"
+      Log.debug "slow down #{@joystick_moved}"
       @vessel.pilot.accelerate_current_vector!(-1.0 - (@joystick_moved[0] + 100) / 2 * 0.01)
     end
   end
@@ -168,250 +200,15 @@ class Game
     end
   end
 
-  include ImGui::Helper
-
-  # will yield the value
-  def draw_slider(label : String, data : Float64, max : Float64 = 100.0, min : Float64 = -100.0, flags : ImGui::ImGuiSliderFlags = ImGui::ImGuiSliderFlags::NoRoundToFormat, &)
-    ptr = pointerof(data)
-    if ImGui.slider_scalar(
-         label: label,
-         p_data: ptr,
-         p_min: min,
-         p_max: max,
-         flags: flags,
-       )
-      yield data
-    end
-  end
-
-  # will yield the value
-  def draw_input(label : String, data : Float64, max : Float64 = 100.0, min : Float64 = -100.0, flags : ImGui::ImGuiInputTextFlags = ImGui::ImGuiInputTextFlags::EnterReturnsTrue, &)
-    ptr = pointerof(data)
-    if ImGui.input_scalar(
-         label: label,
-         p_data: ptr,
-         flags: flags,
-       )
-      data = max if data > max
-      data = min if data < min
-      yield data
-    end
-  end
-
   def accelerate_by_tick(movable_body : Gravity::MovingBody)
     gravity_field = @g.acceleration(movable_body.position)
     acceleration = movable_body.acceleration + gravity_field
     Physics.move_by_one_tick!(@timer.tick, movable_body.position, movable_body.speed, acceleration)
   end
 
-  def draw_captain
-    ImGui.text "Time passed: #{@time_passed}"
-    draw_slider(
-      label: "Set timescale###set_timescale",
-      data: @timescale,
-      min: 0.1,
-      max: 3600 * 24 * 7,
-      flags: (
-        ImGui::ImGuiSliderFlags::Logarithmic
-      ),
-    ) do |value|
-      @timescale = value
-    end
-
-  end
-
-  def draw_pilot
-    draw_table(title: "Trusters", headers: {"Name", "X", "Y", "unit"}) do
-      draw_table_line(
-        "Analogic acceleration",
-        ->{
-          draw_slider(
-            label: "###acceleration_analogue_x",
-            data: @vessel.gravity_body.acceleration[0],
-            flags: (
-              ImGui::ImGuiSliderFlags::Logarithmic
-            ),
-          ) do |value|
-            @vessel.pilot.order(priority: 10, group: :acceleration_x) do
-              @vessel.pilot.set_exact_acceleration_axis!(0, value)
-              @vessel.pilot.permanent_mode = :constant
-              @vessel.pilot.low_thrust_pressed = false
-              @vessel.pilot.low_thrust_save = value
-            end
-          end
-        },
-        ->{
-          draw_slider(
-            label: "###acceleration_analogue_y",
-            data: @vessel.gravity_body.acceleration[1],
-            flags: (
-              ImGui::ImGuiSliderFlags::Logarithmic
-            ),
-          ) do |value|
-            @vessel.pilot.order(priority: 10, group: :acceleration_y) do
-              @vessel.pilot.set_exact_acceleration_axis!(1, value)
-              @vessel.pilot.permanent_mode = :constant
-              @vessel.pilot.low_thrust_pressed = false
-              @vessel.pilot.low_thrust_save = value
-            end
-          end
-        },
-        "m/s²",
-      )
-
-      # automatically reset acceleration to 0, used for maneuvers
-      draw_table_line(
-        "Low thrust",
-        ->{
-          draw_slider(
-            label: "###acceleration_low_analogic_x",
-            data: @vessel.gravity_body.acceleration[0],
-          ) do |value|
-            @vessel.pilot.order(priority: 10, group: :maneuvers) do
-              @vessel.pilot.temporary_mode = :pulse
-              if !@vessel.pilot.low_thrust_pressed
-                @vessel.pilot.low_thrust_save = @vessel.gravity_body.acceleration[0]
-              end
-              @vessel.pilot.low_thrust_pressed = true
-              @vessel.pilot.set_exact_acceleration_axis!(0, value)
-              lock_callback = @ui_events_handler.add(SF::Event::KeyPressed) do |callback, event|
-                if event.as(SF::Event::KeyPressed).code == SF::Keyboard::Key::L
-                  @vessel.pilot.low_thrust_save = value
-                end
-              end
-              @ui_events_handler.add(SF::Event::MouseButtonReleased) do |callback|
-                @ui_events_handler.remove(SF::Event::MouseButtonReleased, callback)
-                @ui_events_handler.remove(SF::Event::MouseButtonReleased, lock_callback)
-                @vessel.pilot.low_thrust_pressed = false
-                @vessel.pilot.set_exact_acceleration_axis!(0, @vessel.pilot.low_thrust_save)
-              end
-            end
-          end
-        },
-        ->{
-          draw_slider(
-            label: "###acceleration_low_analogic_y",
-            data: @vessel.gravity_body.acceleration[1],
-          ) do |value|
-            @vessel.pilot.order(priority: 10, group: :maneuvers) do
-              @vessel.pilot.temporary_mode = :pulse
-              if !@vessel.pilot.low_thrust_pressed
-                @vessel.pilot.low_thrust_save = @vessel.gravity_body.acceleration[1]
-              end
-              @vessel.pilot.low_thrust_pressed = true
-              @vessel.pilot.set_exact_acceleration_axis!(1, value)
-              lock_callback = @ui_events_handler.add(SF::Event::KeyPressed) do |callback, event|
-                if event.as(SF::Event::KeyPressed).code == SF::Keyboard::Key::L
-                  @vessel.pilot.low_thrust_save = value
-                end
-              end
-              @ui_events_handler.add(SF::Event::MouseButtonReleased) do |callback|
-                @ui_events_handler.remove(SF::Event::MouseButtonReleased, callback)
-                @ui_events_handler.remove(SF::Event::MouseButtonReleased, lock_callback)
-                @vessel.pilot.low_thrust_pressed = false
-                @vessel.pilot.set_exact_acceleration_axis!(1, @vessel.pilot.low_thrust_save)
-              end
-            end
-          end
-        },
-        "m/s²",
-      )
-
-      draw_table_line(
-        "Computer acceleration",
-        ->{
-          draw_input(
-            label: "###acceleration_digit_x",
-            data: @vessel.pilot.computer_input_thurst[0],
-          ) do |value|
-            @vessel.pilot.order(priority: 9, group: :maneuvers) do
-              @vessel.pilot.computer_input_thurst[0] = value
-            end
-          end
-        },
-        ->{
-          draw_input(
-            label: "###acceleration_digit_y",
-            data: @vessel.pilot.computer_input_thurst[1],
-          ) do |value|
-            @vessel.pilot.order(priority: 9, group: :maneuvers) do
-              @vessel.pilot.computer_input_thurst[1] = value
-            end
-          end
-        },
-        "m/s²",
-      )
-      draw_table_line(
-        "",
-        ->{
-          if ImGui.button("Comfirm")
-            @vessel.pilot.order(priority: 100, group: :maneuvers) do
-              @vessel.pilot.permanent_mode = :constant
-              @vessel.pilot.set_exact_acceleration_axis!(@vessel.pilot.computer_input_thurst)
-              # @vessel.pilot.set_exact_acceleration_axis!(0, @vessel.pilot.computer_input_thurst[0])
-              # @vessel.pilot.set_exact_acceleration_axis!(1, @vessel.pilot.computer_input_thurst[1])
-            end
-          end
-          if ImGui.button("Reset")
-            @vessel.pilot.order(priority: 100, group: :prepare) do
-              @vessel.pilot.set_exact_acceleration_axis!(@vessel.pilot.computer_input_thurst)
-              # @vessel.pilot.computer_input_thurst[0] = @vessel.gravity_body.acceleration[0]
-              # @vessel.pilot.computer_input_thurst[1] = @vessel.gravity_body.acceleration[1]
-            end
-          end
-        },
-        ->{
-          if ImGui.button("Zero")
-            @vessel.pilot.order(priority: 10, group: :prepare) do
-              @vessel.pilot.computer_input_thurst[0] = 0.0
-              @vessel.pilot.computer_input_thurst[1] = 0.0
-            end
-          end
-        },
-        ->{
-          if @vessel.pilot.permanent_mode != :antigrav
-            if ImGui.button("Anti-grav")
-              @vessel.pilot.order(priority: 10, group: :fly_mode) do
-                @vessel.pilot.permanent_mode = :antigrav
-                @vessel.gravity_body.acceleration[0] = @vessel.gravity[0]
-                @vessel.gravity_body.acceleration[1] = @vessel.gravity[1]
-              end
-            end
-          else
-            if ImGui.button("Disable anti-grav")
-              @vessel.pilot.order(priority: 11, group: :fly_mode) do
-                if @vessel.pilot.permanent_mode == :antigrav
-                  @vessel.pilot.permanent_mode = nil
-                end
-              end
-            end
-          end
-        },
-      )
-    end
-  end
-
-  def draw_navigation(gravity_field)
-    # ImGui.text "Total Accele is  : [#{acceleration[0].round(4)}, #{acceleration[1].round(4)}] m/s²"
-    ImGui.text "Pulse Accele is  : [#{@vessel.gravity_body.acceleration[0].round(4)}, #{@vessel.gravity_body.acceleration[1].round(4)}] m/s²"
-    ImGui.text "GraviticBody is  : [#{gravity_field[0].round(4)}, #{gravity_field[1].round(4)}] m/s²"
-    ImGui.text "Current speed is : #{@vessel.gravity_body.speed.magnitude.round(4)} m/s"
-
-    draw_table(title: "Actual vectors", headers: {"Name", "X", "Y", "unit"}) do
-      draw_table_line "Position", @vessel.gravity_body.position[0].round(3).to_s, @vessel.gravity_body.position[1].round(3).to_s, "m"
-      draw_table_line "Speed", @vessel.gravity_body.speed[0].round(3).to_s, @vessel.gravity_body.speed[1].round(3).to_s, "m/s"
-      draw_table_line "Acceleration", @vessel.gravity_body.acceleration[0].round(3).to_s, @vessel.gravity_body.acceleration[1].round(3).to_s, "m/s²"
-    end
-
-    ImGui.text "Zoom on"
-    ImGui.radio_button("vessel##navigation_zoom", pointerof(@vessel.navigation.zoom_select), 0)
-    ImGui.same_line
-    ImGui.radio_button("star##navigation_zoom", pointerof(@vessel.navigation.zoom_select), 1)
-    ImGui.same_line
-    ImGui.radio_button("fixed##navigation_zoom", pointerof(@vessel.navigation.zoom_select), 2)
-    ImGui.same_line
-    ImGui.radio_button("zero##navigation_zoom", pointerof(@vessel.navigation.zoom_select), 3)
-  end
+  include PhysicsSandboxDraw
+  include PhysicsSandboxGrid
+  include PhysicsSandboxCadran
 
   def execute(tick : Int)
     @vessel.execute_orders!
@@ -422,180 +219,68 @@ class Game
     gravity_field = @g.acceleration(@bodies[:vessel].position)
     @graviting.each { |graviting| accelerate_by_tick(graviting) }
 
-    if ImGui.begin("Bridge")
-      if ImGui.tree_node_ex("Captain", ImGui::ImGuiTreeNodeFlags.new(ImGui::ImGuiTreeNodeFlags::DefaultOpen))
-        draw_captain
-        ImGui.tree_pop
-      end
+    draw_bridge(gravity_field)
 
-      if ImGui.tree_node_ex("Navigation", ImGui::ImGuiTreeNodeFlags.new(ImGui::ImGuiTreeNodeFlags::DefaultOpen))
-        draw_navigation(gravity_field)
-        ImGui.tree_pop
-      end
-
-      if ImGui.tree_node_ex("Pilot", ImGui::ImGuiTreeNodeFlags.new(ImGui::ImGuiTreeNodeFlags::DefaultOpen))
-        draw_pilot
-        ImGui.tree_pop
-      end
-
-      ImGui.end
-    end
-
-    zoom_object_position =
+    object_position =
       if @vessel.navigation.zoom_select == 0
-        @vessel.navigation.zoom_position = @vessel.gravity_body.position * ZOOM
+        @vessel.navigation.zoom_position = @vessel.gravity_body.position
       elsif @vessel.navigation.zoom_select == 1
-        @vessel.navigation.zoom_position = @star.gravity_body.position * ZOOM
+        @vessel.navigation.zoom_position = @star.gravity_body.position
       elsif @vessel.navigation.zoom_select == 2
         @vessel.navigation.zoom_position
       else
         @vessel.navigation.zoom_position = @screen_center_position
       end
-    zoom_offset = @screen_center_position - zoom_object_position
-    @projectables.each { |projectable| @window.draw(projectable.sf_shape(ZOOM, zoom_offset)) }
-    draw_all_trajectories(ZOOM, zoom_offset)
+    @center_position = object_position
+    @view.set_center(
+      @center_position[0],
+      @center_position[1],
+    )
+    if @zoom != @vessel.navigation.zoom_ratio
+      @view.zoom @zoom / @vessel.navigation.zoom_ratio
+      @zoom = @vessel.navigation.zoom_ratio
+      if @zoom == 1.0
+        @view.viewport = default_viewport
+      end
+    end
+    @window.view = @view
 
-    draw_grid(ZOOM, zoom_object_position)
-    # draw_grid(ZOOM, Vector[0.0, 0.0])
+    @projectables.each { |projectable| draw(projectable.sf_shape) }
+    draw_all_trajectories
+    # draw_grid
+    @vessel.navigation.cadran.radius.each do |radius|
+      draw_cadran(center: @vessel.gravity_body.position, radius: radius)
+    end
   end
 
-  def draw_all_trajectories(coef, offset)
+  def draw_all_trajectories
     t = Trajectory.new(body: @vessel_p.gravity_body, gravity_field: @g)
     t_with_gravity = t.compute(steps: 1000, accuracy: 500.millisecond * @timescale)
-    draw_trajectory({255, 0, 0}, t_with_gravity, coef, offset)
+    draw_trajectory({255, 0, 0}, t_with_gravity)
 
     t = Trajectory.new(body: @vessel_p.gravity_body, gravity_field: Gravity::Field(2).zero)
     t_without_gravity = t.compute(steps: 20, accuracy: 5.second * @timescale)
-    draw_trajectory({255, 255, 0}, t_without_gravity, coef, offset)
+    draw_trajectory({255, 255, 0}, t_without_gravity)
 
     t = Trajectory.new(body: @pla1.gravity_body, gravity_field: @g)
     t_without_gravity = t.compute(steps: 100, accuracy: 10.second * @timescale)
-    draw_trajectory({255, 0, 0}, t_without_gravity, coef, offset)
+    draw_trajectory({255, 0, 0}, t_without_gravity)
 
     t = Trajectory.new(body: @pla2.gravity_body, gravity_field: @g)
     t_without_gravity = t.compute(steps: 100, accuracy: 10.second * @timescale)
-    draw_trajectory({0, 0, 255}, t_without_gravity, coef, offset)
+    draw_trajectory({0, 0, 255}, t_without_gravity)
 
     t = Trajectory.new(body: @pla3.gravity_body, gravity_field: @g)
     t_without_gravity = t.compute(steps: 100, accuracy: 10.second * @timescale)
-    draw_trajectory({0, 255, 0}, t_without_gravity, coef, offset)
+    draw_trajectory({0, 255, 0}, t_without_gravity)
   end
 
-  def draw_trajectory(color : Tuple(Int32, Int32, Int32), trajectory, coef = 1.0, offset = Vector(Float64, 2).zero)
+  def draw_trajectory(color : Tuple(Int32, Int32, Int32), trajectory)
     trajectory.each do |point|
-      sf_point = SF::CircleShape.new(1)
+      sf_point = SF::CircleShape.new(2)
       sf_point.fill_color = SF.color(*color)
-      point = point * coef + offset
       sf_point.position = SF.vector2(point[0], point[1])
-      @window.draw(sf_point)
-    end
-  end
-
-  def absolute_coordinates(x, y, coef, offset)
-    v = SF.vector2f(
-      (x - (offset[0] % MAIN_LINES_REAL_SPACE)) * coef,
-      (y - (offset[1] % MAIN_LINES_REAL_SPACE)) * coef,
-    )
-    # pp v
-    # v
-  end
-
-  def relative_coordinates(x, y, coef, offset)
-    SF.vector2f(x * coef, y * coef)
-  end
-
-  MAIN_LINES_REAL_SPACE = 1000
-  SECONDARY_LINES_AMOUNT = 3
-  SECONDARY_LINES_SPACE = MAIN_LINES_REAL_SPACE / SECONDARY_LINES_AMOUNT
-  SECONDARY_LINES_COLOR = SF::Color.new(255, 255, 255, 20)
-
-  # this one will be dynamic to evaluate distances
-  def draw_grid(coef, zoom_offset)
-    main_lines = Array(SF::VertexBuffer).new
-    secondary_lines = Array(SF::VertexBuffer).new
-    max_size = {@width, @height}.max
-
-    # puts "------------------"
-    main_lines_amount = (MAIN_LINES_REAL_SPACE / max_size / coef).ceil.to_i32 + 2
-    main_lines_amount.times do |index|
-      main_line_v = SF::VertexBuffer.new(SF::LineStrip)
-      main_line_h = SF::VertexBuffer.new(SF::LineStrip)
-      main_lines << main_line_v
-      main_lines << main_line_h
-      main_line_v.create(2)
-      main_line_h.create(2)
-      v_start = MAIN_LINES_REAL_SPACE * index
-      v_end = @width / coef + zoom_offset[0] % MAIN_LINES_REAL_SPACE
-      h_start = MAIN_LINES_REAL_SPACE * index
-      h_end = @height / coef + zoom_offset[1] % MAIN_LINES_REAL_SPACE
-      # pp({
-      #      index: index,
-      #      v_start: v_start,
-      #      v_end: v_end,
-      #      h_start: h_start,
-      #      h_end: h_end,
-      #      offset: zoom_offset,
-      #      coef: coef,
-      #    })
-      main_line_v_buffer_0 = SF::Vertex.new(
-        absolute_coordinates(v_start, 0, coef, zoom_offset),
-      )
-      main_line_v_buffer_1 = SF::Vertex.new(
-        absolute_coordinates(v_start, h_end, coef, zoom_offset),
-      )
-      main_line_h_buffer_0 = SF::Vertex.new(
-        absolute_coordinates(0, h_start, coef, zoom_offset),
-      )
-      main_line_h_buffer_1 = SF::Vertex.new(
-        absolute_coordinates(v_end, h_start, coef, zoom_offset),
-      )
-      main_line_v_buffer = Slice[main_line_v_buffer_0, main_line_v_buffer_1]
-      main_line_h_buffer = Slice[main_line_h_buffer_0, main_line_h_buffer_1]
-      main_line_v.update(main_line_v_buffer, 0)
-      main_line_h.update(main_line_h_buffer, 0)
-
-      SECONDARY_LINES_AMOUNT.times do |subindex|
-        secondary_line_v = SF::VertexBuffer.new(SF::LineStrip)
-        secondary_line_h = SF::VertexBuffer.new(SF::LineStrip)
-        secondary_lines << secondary_line_v
-        secondary_lines << secondary_line_h
-        secondary_line_v.create(2)
-        secondary_line_h.create(2)
-        secondary_v_start = SECONDARY_LINES_SPACE * subindex
-        secondary_h_start = SECONDARY_LINES_SPACE * subindex
-        secondary_line_v_buffer_0 = SF::Vertex.new(
-          absolute_coordinates(v_start + secondary_v_start, 0, coef, zoom_offset),
-          color: SECONDARY_LINES_COLOR,
-        )
-        secondary_line_v_buffer_1 = SF::Vertex.new(
-          absolute_coordinates(v_start + secondary_v_start, h_end, coef, zoom_offset),
-          color: SECONDARY_LINES_COLOR,
-        )
-        secondary_line_h_buffer_0 = SF::Vertex.new(
-          absolute_coordinates(0, h_start + secondary_h_start, coef, zoom_offset),
-          color: SECONDARY_LINES_COLOR,
-        )
-        secondary_line_h_buffer_1 = SF::Vertex.new(
-          absolute_coordinates(v_end, h_start + secondary_h_start, coef, zoom_offset),
-          color: SECONDARY_LINES_COLOR,
-        )
-        secondary_line_v_buffer = Slice[secondary_line_v_buffer_0, secondary_line_v_buffer_1]
-        secondary_line_h_buffer = Slice[secondary_line_h_buffer_0, secondary_line_h_buffer_1]
-        secondary_line_v.update(secondary_line_v_buffer, 0)
-        secondary_line_h.update(secondary_line_h_buffer, 0)
-      end
-
-    end
-
-    main_lines.each do |line|
-      # line[0].color = SF::Color.new(255, 255, 255)
-      # line[1].color = SF::Color.new(255, 255, 255)
-      @window.draw(line)
-    end
-    secondary_lines.each do |line|
-      # line[0].color = SF::Color.new(255, 255, 255)
-      # line[1].color = SF::Color.new(255, 255, 255)
-      @window.draw(line)
+      draw(sf_point)
     end
   end
 end

src/tests/physics_sandbox/cadran.cr

@@ -0,0 +1,56 @@
+module PhysicsSandboxCadran
+
+  def add_line(lines, p1 : SF::Vector2f, p2 : SF::Vector2f, color : SF::Color = SF::Color::White)
+    line1 = SF::VertexBuffer.new(SF::LineStrip)
+    line1.create(2)
+    line1.update(
+      Slice[
+        SF::Vertex.new(position: p1, color: color),
+        SF::Vertex.new(position: p2, color: color),
+      ], 0)
+    lines << line1
+  end
+
+  CADRAN_COLOR = SF::Color.new(230, 230, 230, 120)
+  def draw_cadran(center : Vector(Float64, 2), radius : Number)
+    circle = SF::CircleShape.new(radius: radius, point_count: 100)
+    circle.outline_color = CADRAN_COLOR
+    circle.outline_thickness = 1
+    center_position_offset = {
+      center[0] - radius,
+      center[1] - radius,
+    }
+    circle.position = center_position_offset
+    circle.fill_color = SF::Color::Transparent
+    draw(circle)
+
+    lines = Array(SF::VertexBuffer).new
+    add_line(
+      lines: lines,
+      p1: SF.vector2f(center[0] - 2**(1/2)/2 * radius, center[1] - 2**(1/2)/2 * radius),
+      p2: SF.vector2f(center[0] + 2**(1/2)/2 * radius, center[1] + 2**(1/2)/2 * radius),
+      color: CADRAN_COLOR,
+    )
+    add_line(
+      lines: lines,
+      p1: SF.vector2f(center[0] + 2**(1/2)/2 * radius, center[1] - 2**(1/2)/2 * radius),
+      p2: SF.vector2f(center[0] - 2**(1/2)/2 * radius, center[1] + 2**(1/2)/2 * radius),
+      color: CADRAN_COLOR,
+    )
+    add_line(
+      lines: lines,
+      p1: SF.vector2f(center[0] + radius, center[1]),
+      p2: SF.vector2f(center[0] - radius, center[1]),
+      color: CADRAN_COLOR,
+    )
+    add_line(
+      lines: lines,
+      p1: SF.vector2f(center[0], center[1] - radius),
+      p2: SF.vector2f(center[0], center[1] + radius),
+      color: CADRAN_COLOR,
+    )
+
+    lines.each { |line| draw(line) }
+  end
+
+end

src/tests/physics_sandbox/draw.cr

@@ -0,0 +1,360 @@
+module PhysicsSandboxDraw
+
+  include ImGui::Helper
+
+  # will yield the value
+  def draw_slider(label : String, data : Float64, max : Float64 = 100.0, min : Float64 = -100.0, flags : ImGui::ImGuiSliderFlags = ImGui::ImGuiSliderFlags::NoRoundToFormat, &)
+    ptr = pointerof(data)
+    if ImGui.slider_scalar(
+         label: label,
+         p_data: ptr,
+         p_min: min,
+         p_max: max,
+         flags: flags,
+       )
+      yield data
+    end
+  end
+
+  # will yield the value
+  def draw_input(label : String, data : Float64, max : Float64 = 100.0, min : Float64 = -100.0, flags : ImGui::ImGuiInputTextFlags = ImGui::ImGuiInputTextFlags::EnterReturnsTrue, &)
+    ptr = pointerof(data)
+    if ImGui.input_scalar(
+         label: label,
+         p_data: ptr,
+         flags: flags,
+       )
+      data = max if data > max
+      data = min if data < min
+      yield data
+    end
+  end
+
+  def draw_captain
+    ImGui.text "Time passed: #{@time_passed}"
+    draw_slider(
+      label: "Set timescale###set_timescale",
+      data: @timescale,
+      min: 0.1,
+      max: 3600 * 24 * 7,
+      flags: (
+        ImGui::ImGuiSliderFlags::Logarithmic
+      ),
+    ) do |value|
+      @timescale = value
+    end
+
+  end
+
+  def draw_pilot
+    draw_table(title: "Trusters", headers: {"Name", "X", "Y", "unit"}) do
+      draw_table_line(
+        "Analogic acceleration",
+        ->{
+          draw_slider(
+            label: "###acceleration_analogue_x",
+            data: @vessel.gravity_body.acceleration[0],
+            min: -@vessel.pilot.max_thrust,
+            max: @vessel.pilot.max_thrust,
+            flags: (
+              ImGui::ImGuiSliderFlags::Logarithmic
+            ),
+          ) do |value|
+            @vessel.pilot.order(priority: 10, group: :acceleration_x) do
+              @vessel.pilot.set_exact_acceleration_axis(0, value)
+              @vessel.pilot.permanent_modes.clear
+              @vessel.pilot.permanent_modes << Vessel::Pilot::Mode::Constant
+              @vessel.pilot.low_thrust_pressed = false
+              @vessel.pilot.low_thrust_save = value
+            end
+          end
+        },
+        ->{
+          draw_slider(
+            label: "###acceleration_analogue_y",
+            data: @vessel.gravity_body.acceleration[1],
+            min: -@vessel.pilot.max_thrust,
+            max: @vessel.pilot.max_thrust,
+            flags: (
+              ImGui::ImGuiSliderFlags::Logarithmic
+            ),
+          ) do |value|
+            @vessel.pilot.order(priority: 10, group: :acceleration_y) do
+              @vessel.pilot.set_exact_acceleration_axis(1, value)
+              @vessel.pilot.permanent_modes.clear
+              @vessel.pilot.permanent_modes << Vessel::Pilot::Mode::Constant
+              @vessel.pilot.low_thrust_pressed = false
+              @vessel.pilot.low_thrust_save = value
+            end
+          end
+        },
+        "m/s²",
+      )
+
+      # automatically reset acceleration to 0, used for maneuvers
+      draw_table_line(
+        "Low thrust",
+        ->{
+          draw_slider(
+            label: "###acceleration_low_analogic_x",
+            data: @vessel.gravity_body.acceleration[0],
+            min: -@vessel.pilot.max_thrust,
+            max: @vessel.pilot.max_thrust,
+          ) do |value|
+            @vessel.pilot.order(priority: 10, group: :maneuvers) do
+              @vessel.pilot.temporary_modes << Vessel::Pilot::Mode::Pulse
+              if !@vessel.pilot.low_thrust_pressed
+                @vessel.pilot.low_thrust_save = @vessel.gravity_body.acceleration[0]
+              end
+              @vessel.pilot.low_thrust_pressed = true
+              @vessel.pilot.set_exact_acceleration_axis(0, value)
+              lock_callback = @ui_events_handler.add(SF::Event::KeyPressed) do |callback, event|
+                if event.as(SF::Event::KeyPressed).code == SF::Keyboard::Key::L
+                  @vessel.pilot.low_thrust_save = value
+                end
+              end
+              @ui_events_handler.add(SF::Event::MouseButtonReleased) do |callback|
+                @ui_events_handler.remove(SF::Event::MouseButtonReleased, callback)
+                @ui_events_handler.remove(SF::Event::MouseButtonReleased, lock_callback)
+                @vessel.pilot.low_thrust_pressed = false
+                @vessel.pilot.set_exact_acceleration_axis(0, @vessel.pilot.low_thrust_save)
+              end
+            end
+          end
+        },
+        ->{
+          draw_slider(
+            label: "###acceleration_low_analogic_y",
+            data: @vessel.gravity_body.acceleration[1],
+            min: -@vessel.pilot.max_thrust,
+            max: @vessel.pilot.max_thrust,
+          ) do |value|
+            @vessel.pilot.order(priority: 10, group: :maneuvers) do
+              @vessel.pilot.temporary_modes << Vessel::Pilot::Mode::Pulse
+              if !@vessel.pilot.low_thrust_pressed
+                @vessel.pilot.low_thrust_save = @vessel.gravity_body.acceleration[1]
+              end
+              @vessel.pilot.low_thrust_pressed = true
+              @vessel.pilot.set_exact_acceleration_axis(1, value)
+              lock_callback = @ui_events_handler.add(SF::Event::KeyPressed) do |callback, event|
+                if event.as(SF::Event::KeyPressed).code == SF::Keyboard::Key::L
+                  @vessel.pilot.low_thrust_save = value
+                end
+              end
+              @ui_events_handler.add(SF::Event::MouseButtonReleased) do |callback|
+                @ui_events_handler.remove(SF::Event::MouseButtonReleased, callback)
+                @ui_events_handler.remove(SF::Event::MouseButtonReleased, lock_callback)
+                @vessel.pilot.low_thrust_pressed = false
+                @vessel.pilot.set_exact_acceleration_axis(1, @vessel.pilot.low_thrust_save)
+              end
+            end
+          end
+        },
+        "m/s²",
+      )
+
+      draw_table_line(
+        "Computer acceleration",
+        ->{
+          draw_input(
+            label: "###acceleration_digit_x",
+            data: @vessel.pilot.computer_input_thrust[0],
+            min: -@vessel.pilot.max_thrust,
+            max: @vessel.pilot.max_thrust,
+          ) do |value|
+            @vessel.pilot.order(priority: 9, group: :maneuvers) do
+              @vessel.pilot.computer_input_thrust[0] = value
+            end
+          end
+        },
+        ->{
+          draw_input(
+            label: "###acceleration_digit_y",
+            data: @vessel.pilot.computer_input_thrust[1],
+            min: -@vessel.pilot.max_thrust,
+            max: @vessel.pilot.max_thrust,
+          ) do |value|
+            @vessel.pilot.order(priority: 9, group: :maneuvers) do
+              @vessel.pilot.computer_input_thrust[1] = value
+            end
+          end
+        },
+        "m/s²",
+      )
+
+      draw_table_line(
+        "[Security] Max thurst",
+        ->{
+          draw_input(
+            label: "###pilot_input_max_thurst",
+            data: @vessel.pilot.max_thrust,
+            min: 9,
+            max: 900,
+          ) do |value|
+            @vessel.pilot.max_thrust = value
+          end
+        },
+        ->{
+          draw_slider(
+            label: "###pilot_slider_max_thurst",
+            data: @vessel.pilot.max_thrust,
+            min: 9,
+            max: 900,
+          ) do |value|
+            @vessel.pilot.max_thrust = value
+          end
+        },
+        ->{
+          ImGui.text @vessel.pilot.max_thrust > 20 ? "Inertia Dampers needed" : "No danger"
+        }
+      )
+
+      # Manual reset
+      draw_table_line(
+        "",
+        ->{
+          if ImGui.button("Comfirm")
+            @vessel.pilot.order(priority: 100, group: :maneuvers) do
+              @vessel.pilot.permanent_modes.clear
+              @vessel.pilot.permanent_modes << Vessel::Pilot::Mode::Constant
+              @vessel.pilot.set_exact_acceleration_axis(@vessel.pilot.computer_input_thrust)
+              # @vessel.pilot.set_exact_acceleration_axis(0, @vessel.pilot.computer_input_thrust[0])
+              # @vessel.pilot.set_exact_acceleration_axis(1, @vessel.pilot.computer_input_thrust[1])
+            end
+          end
+        },
+        ->{
+          if ImGui.button("Reset")
+            @vessel.pilot.order(priority: 100, group: :prepare) do
+              @vessel.pilot.permanent_modes.clear
+              @vessel.pilot.permanent_modes << Vessel::Pilot::Mode::Constant
+              @vessel.pilot.set_exact_acceleration_axis(@vessel.pilot.computer_input_thrust)
+              # @vessel.pilot.computer_input_thrust[0] = @vessel.gravity_body.acceleration[0]
+              # @vessel.pilot.computer_input_thrust[1] = @vessel.gravity_body.acceleration[1]
+            end
+          end
+        },
+        ->{
+          if ImGui.button("Zero")
+            @vessel.pilot.order(priority: 10, group: :prepare) do
+              @vessel.pilot.computer_input_thrust[0] = 0.0
+              @vessel.pilot.computer_input_thrust[1] = 0.0
+            end
+          end
+        },
+      )
+
+      draw_table_line(
+        "",
+        # AntiGrav
+        ->{
+          if !@vessel.pilot.permanent_modes.includes?(Vessel::Pilot::Mode::AntiGrav)
+            if ImGui.button("Anti-grav")
+              @vessel.pilot.order(priority: 10, group: :fly_mode) do
+                @vessel.pilot.permanent_modes << Vessel::Pilot::Mode::AntiGrav
+                # @vessel.gravity_body.acceleration[0] = @vessel.gravity[0]
+                # @vessel.gravity_body.acceleration[1] = @vessel.gravity[1]
+              end
+            end
+          else
+            if ImGui.button("Disable anti-grav")
+              @vessel.pilot.order(priority: 11, group: :fly_mode) do
+                if @vessel.pilot.permanent_modes.includes?(Vessel::Pilot::Mode::AntiGrav)
+                  @vessel.pilot.permanent_modes.delete Vessel::Pilot::Mode::AntiGrav
+                end
+              end
+            end
+          end
+        },
+
+        # AntiSpeed
+        ->{
+          if !@vessel.pilot.permanent_modes.includes?(Vessel::Pilot::Mode::AntiSpeed)
+            if ImGui.button("Anti-speed")
+              @vessel.pilot.order(priority: 10, group: :fly_mode) do
+                @vessel.pilot.permanent_modes << Vessel::Pilot::Mode::AntiSpeed
+                @vessel.pilot.current_selected_body = @star.gravity_body
+                # @vessel.antispeed[0] = @vessel.speed[0]
+                # @vessel.antispeed[1] = @vessel.speed[1]
+              end
+            end
+          else
+            if ImGui.button("Disable anti-speed")
+              @vessel.pilot.order(priority: 11, group: :fly_mode) do
+                if @vessel.pilot.permanent_modes << Vessel::Pilot::Mode::AntiSpeed
+                  @vessel.pilot.permanent_modes.delete Vessel::Pilot::Mode::AntiSpeed
+                end
+              end
+            end
+          end
+        },
+      )
+
+    end
+  end
+
+  def draw_navigation(gravity_field)
+    # ImGui.text "Total Accele is  : [#{acceleration[0].round(4)}, #{acceleration[1].round(4)}] m/s²"
+    ImGui.text "Pulse Accele is  : [#{@vessel.gravity_body.acceleration[0].round(4)}, #{@vessel.gravity_body.acceleration[1].round(4)}] m/s²"
+    ImGui.text "GraviticBody is  : [#{gravity_field[0].round(4)}, #{gravity_field[1].round(4)}] m/s²"
+    ImGui.text "Current speed is : #{@vessel.gravity_body.speed.magnitude.round(4)} m/s"
+
+    draw_table(title: "Actual vectors", headers: {"Name", "X", "Y", "unit"}) do
+      draw_table_line "Position", @vessel.gravity_body.position[0].round(3).to_s, @vessel.gravity_body.position[1].round(3).to_s, "m"
+      draw_table_line "Speed", @vessel.gravity_body.speed[0].round(3).to_s, @vessel.gravity_body.speed[1].round(3).to_s, "m/s"
+      draw_table_line "Acceleration", @vessel.gravity_body.acceleration[0].round(3).to_s, @vessel.gravity_body.acceleration[1].round(3).to_s, "m/s²"
+    end
+
+    ImGui.text "Zoom on"
+    ImGui.radio_button("vessel##navigation_zoom", pointerof(@vessel.navigation.zoom_select), 0)
+    ImGui.same_line
+    ImGui.radio_button("star##navigation_zoom", pointerof(@vessel.navigation.zoom_select), 1)
+    ImGui.same_line
+    ImGui.radio_button("fixed##navigation_zoom", pointerof(@vessel.navigation.zoom_select), 2)
+    ImGui.same_line
+    ImGui.radio_button("zero##navigation_zoom", pointerof(@vessel.navigation.zoom_select), 3)
+    draw_slider(
+      label: "###cadran_slide_zoom_ratio",
+      data: @vessel.navigation.zoom_ratio,
+      max: 10,
+      min: 0.001,
+      flags: ImGui::ImGuiSliderFlags::Logarithmic,
+    ) do |value|
+      @vessel.navigation.zoom_ratio = value
+    end
+
+    ImGui.text "Cadran"
+    draw_slider(
+      label: "###cadran_slide_radius",
+      data: @vessel.navigation.cadran.radius[0],
+      max: 10.0**10,
+      min: 0.0,
+      flags: ImGui::ImGuiSliderFlags::Logarithmic,
+    ) do |value|
+      @vessel.navigation.cadran.radius[0] = value
+    end
+  end
+
+  def draw_bridge(gravity_field)
+
+    if ImGui.begin("Bridge")
+      if ImGui.tree_node_ex("Captain", ImGui::ImGuiTreeNodeFlags.new(ImGui::ImGuiTreeNodeFlags::DefaultOpen))
+        draw_captain
+        ImGui.tree_pop
+      end
+
+      if ImGui.tree_node_ex("Navigation", ImGui::ImGuiTreeNodeFlags.new(ImGui::ImGuiTreeNodeFlags::DefaultOpen))
+        draw_navigation(gravity_field)
+        ImGui.tree_pop
+      end
+
+      if ImGui.tree_node_ex("Pilot", ImGui::ImGuiTreeNodeFlags.new(ImGui::ImGuiTreeNodeFlags::DefaultOpen))
+        draw_pilot
+        ImGui.tree_pop
+      end
+
+      ImGui.end
+    end
+  end
+
+end

src/tests/physics_sandbox/grid.cr

@@ -0,0 +1,115 @@
+module PhysicsSandboxGrid
+
+  MAIN_LINES_REAL_SPACE = 1000
+  SECONDARY_LINES_AMOUNT = 3
+  SECONDARY_LINES_SPACE = MAIN_LINES_REAL_SPACE / SECONDARY_LINES_AMOUNT
+  SECONDARY_LINES_COLOR = SF::Color.new(255, 255, 255, 30)
+
+  def absolute_coordinates(pos, offset)
+    SF.vector2f(pos[0] + offset[0], pos[1] + offset[1])
+  end
+
+  # this one will be dynamic to evaluate distances
+  def draw_grid
+    main_lines = Array(SF::VertexBuffer).new
+    secondary_lines = Array(SF::VertexBuffer).new
+    width = @width
+    height = @height
+    max_size = {width, height}.max
+    offset = {
+      -@center_position[0] + (@center_position[0] // MAIN_LINES_REAL_SPACE) * MAIN_LINES_REAL_SPACE,
+      -@center_position[1] + (@center_position[1] // MAIN_LINES_REAL_SPACE) * MAIN_LINES_REAL_SPACE,
+    }
+
+    main_lines_amount = (max_size / MAIN_LINES_REAL_SPACE).ceil.to_i32 + 1
+    start = -main_lines_amount // 2
+    stop = start + main_lines_amount
+    pp({
+         center_position: @center_position,
+         offset: offset,
+         max_size: max_size,
+         start: start,
+         stop: stop,
+         main_lines_amount: main_lines_amount,
+       })
+
+    (start..stop).each do |index|
+      main_line_v = SF::VertexBuffer.new(SF::LineStrip)
+      main_line_h = SF::VertexBuffer.new(SF::LineStrip)
+      main_lines << main_line_v
+      main_lines << main_line_h
+      main_line_v.create(2)
+      main_line_h.create(2)
+      x_start = MAIN_LINES_REAL_SPACE * index
+      x_end = width
+      y_start = MAIN_LINES_REAL_SPACE * index
+      y_end = height
+      # pp({
+      #      center_position: @center_position,
+      #      index: index,
+      #      v_start: v_start,
+      #      x_end: x_end,
+      #      y_start: y_start,
+      #      h_end: h_end,
+      #      x_start: x_start,
+      #      y_start: y_start,
+      #    })
+      main_line_v_buffer_0 = SF::Vertex.new(
+        absolute_coordinates({x_start, start * MAIN_LINES_REAL_SPACE}, offset),
+      )
+      main_line_v_buffer_1 = SF::Vertex.new(
+        absolute_coordinates({x_start, y_end}, offset),
+      )
+      main_line_h_buffer_0 = SF::Vertex.new(
+        absolute_coordinates({start * MAIN_LINES_REAL_SPACE, y_start}, offset),
+      )
+      main_line_h_buffer_1 = SF::Vertex.new(
+        absolute_coordinates({x_end, y_start}, offset),
+      )
+      main_line_v_buffer = Slice[main_line_v_buffer_0, main_line_v_buffer_1]
+      main_line_h_buffer = Slice[main_line_h_buffer_0, main_line_h_buffer_1]
+      main_line_v.update(main_line_v_buffer, 0)
+      main_line_h.update(main_line_h_buffer, 0)
+
+      SECONDARY_LINES_AMOUNT.times do |subindex|
+        secondary_line_v = SF::VertexBuffer.new(SF::LineStrip)
+        secondary_line_h = SF::VertexBuffer.new(SF::LineStrip)
+        secondary_lines << secondary_line_v
+        secondary_lines << secondary_line_h
+        secondary_line_v.create(2)
+        secondary_line_h.create(2)
+        secondary_x_start = SECONDARY_LINES_SPACE * subindex
+        secondary_y_start = SECONDARY_LINES_SPACE * subindex
+        secondary_line_v_buffer_0 = SF::Vertex.new(
+          absolute_coordinates({x_start + secondary_x_start, start * MAIN_LINES_REAL_SPACE}, offset),
+          color: SECONDARY_LINES_COLOR,
+        )
+        secondary_line_v_buffer_1 = SF::Vertex.new(
+          absolute_coordinates({x_start + secondary_x_start, y_end}, offset),
+          color: SECONDARY_LINES_COLOR,
+        )
+        secondary_line_h_buffer_0 = SF::Vertex.new(
+          absolute_coordinates({start * MAIN_LINES_REAL_SPACE, y_start + secondary_y_start}, offset),
+          color: SECONDARY_LINES_COLOR,
+        )
+        secondary_line_h_buffer_1 = SF::Vertex.new(
+          absolute_coordinates({x_end, y_start + secondary_y_start}, offset),
+          color: SECONDARY_LINES_COLOR,
+        )
+        secondary_line_v_buffer = Slice[secondary_line_v_buffer_0, secondary_line_v_buffer_1]
+        secondary_line_h_buffer = Slice[secondary_line_h_buffer_0, secondary_line_h_buffer_1]
+        secondary_line_v.update(secondary_line_v_buffer, 0)
+        secondary_line_h.update(secondary_line_h_buffer, 0)
+      end
+
+    end
+
+    main_lines.each do |line|
+      draw(line)
+    end
+    secondary_lines.each do |line|
+      draw(line)
+    end
+  end
+
+end