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63 行
1.7 KiB
63 行
1.7 KiB
using System.Numerics;
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namespace Smoll {
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struct Transform2D {
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public Complex position;
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public float angle;
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public float scale;
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public void ForceInvariant() {
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while(angle > 2*MathF.PI) angle -= 2*MathF.PI;
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while(angle < 0) angle += 2*MathF.PI;
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}
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}
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sealed class Transform2DComponent : Component {
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public Transform2D transform;
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public Transform2DComponent()
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: this(0,0,0,1)
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{}
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public Transform2DComponent(float x, float y)
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: this(x,y,0,1)
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{}
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public Transform2DComponent(float x, float y, float angle)
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: this(x,y,angle,1)
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{}
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public Transform2DComponent(float x, float y, float angle, float scale) {
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transform = new Transform2D();
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transform.position = y*Complex.ImaginaryOne + x;
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transform.angle = angle;
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transform.scale = scale;
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}
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public Transform2D AbsoluteTransform() {
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var up = owner.parent;
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do {
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if(up == null) return transform;
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var component = up.GetComponent<Transform2DComponent>();
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if(component != null) {
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Transform2D combined = component.AbsoluteTransform();
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combined.scale *= transform.scale;
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var scaled_pos = combined.scale*(transform.position)*Complex.Exp(Complex.ImaginaryOne * combined.angle);
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combined.position = scaled_pos + combined.position;
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combined.angle += transform.angle;
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combined.ForceInvariant();
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return combined;
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}
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up = up.parent;
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} while(true);
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}
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public override void Update(float _)
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{
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transform.ForceInvariant();
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}
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}
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}
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