21 lines
691 B
Crystal
21 lines
691 B
Crystal
require "../../../src/engine/gravity/field"
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describe Gravity::Field do
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earth = Gravity::Body(2).new(mass: 5972200000000000000000000.0, position: Vector[0.0, 0.0])
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earth_surface = Vector[6371000.0, 0.0]
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it "accelerate arbitrary points" do
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field = Gravity::Field(2).new([earth])
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field = Gravity::Field(2).new(earth)
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field = Gravity::Field(2).new({earth})
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earth.acceleration(earth_surface).magnitude.round(2).should eq(9.82)
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end
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it "allow zero gravity field" do
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g = Gravity::Field(2).zero
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g.acceleration(earth_surface).magnitude.round(2).should eq(0)
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g = Gravity::Field(2).new
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g.acceleration(earth_surface).magnitude.round(2).should eq(0)
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end
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end
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