35 lines
1.3 KiB
C#
35 lines
1.3 KiB
C#
using Engine.Core;
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using Engine.Systems.Graphics;
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namespace Pong.Behaviours;
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public class DrawableCircle : Behaviour2D, IDrawableTriangle, IPreDraw
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{
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private const float CIRCLE_SEGMENT_COUNT = 32f;
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private readonly Circle circle = new();
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private Circle worldCircle = new();
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public ColorRGBA Color { get; set; } = new ColorRGBA(255, 255, 255);
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public void PreDraw() => UpdateWorldCircle();
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public void Draw(ITriangleBatch triangleBatch)
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{
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for (int i = 0; i < CIRCLE_SEGMENT_COUNT; i++)
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{
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float iPi1 = i / CIRCLE_SEGMENT_COUNT * 2f * Math.Pi;
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float iPi2 = (i + 1f).Mod(CIRCLE_SEGMENT_COUNT) / CIRCLE_SEGMENT_COUNT * 2f * Math.Pi;
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Vector2D firstVertex = new Vector2D(Math.Sin(iPi1), Math.Cos(iPi1)) * worldCircle.Radius;
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Vector2D secondVertex = new Vector2D(Math.Sin(iPi2), Math.Cos(iPi2)) * worldCircle.Radius;
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triangleBatch.Draw(new(worldCircle.Center, worldCircle.Center + firstVertex, worldCircle.Center + secondVertex), Color);
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}
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}
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protected void UpdateWorldCircle() => worldCircle = circle.Transform(Transform);
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public DrawableCircle(Circle circle) { this.circle = circle; }
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public DrawableCircle(Circle circle, ColorRGBA color) { this.circle = circle; Color = color; }
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}
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