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- --
- -- This example demonstrates entity hierarchy by simulating a simple solar system.
- -- Since entity transformations are always relative to the entity's parent
- -- so the moon's rotation takes places around the planet, which is its parent.
- --
- screen = Screen()
- sun = ScreenShape(ScreenShape.SHAPE_CIRCLE, 100,100, 30)
- sun:setPosition(640/2, 480/2)
- sun:setColor(0.7, 0.5, 0.3, 1)
- sun.colorAffectsChildren = false
- screen:addChild(sun)
- planet = ScreenShape(ScreenShape.SHAPE_CIRCLE, 50,50, 30)
- planet:setPosition(150,0)
- planet:setColor(0.2, 0.8, 0, 1)
- planet.colorAffectsChildren = false
- sun:addChild(planet)
- moon = ScreenShape(ScreenShape.SHAPE_CIRCLE, 20,20, 30)
- moon:setPosition(50,0)
- moon:setColor(1, 1, 0.6, 1)
- planet:addChild(moon)
- planetRotation = 0
- moonRotation = 0
- function Update(elapsed)
- planetRotation = planetRotation + elapsed
- moonRotation = moonRotation + (elapsed * 6)
- planet:setPosition(cos(planetRotation)*150, sin(planetRotation)*150)
- moon:setPosition(cos(moonRotation)*50, sin(moonRotation)*50)
- end
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