102 lines
3.9 KiB
C#
102 lines
3.9 KiB
C#
using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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using RecrownedAthenaeum.Camera;
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using System;
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namespace RecrownedAthenaeum.Render
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{
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public class RectangleRenderer : IDisposable
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{
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public readonly PrimitiveBatch primitiveBatch;
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private bool disposed;
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private bool began;
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private bool filling;
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public RectangleRenderer(PrimitiveBatch primitiveBatch)
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{
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this.primitiveBatch = primitiveBatch;
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}
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public RectangleRenderer(GraphicsDevice graphicsDevice, Camera2D camera) : this(new PrimitiveBatch(graphicsDevice, camera, 4))
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{
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}
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public void Begin(bool filled)
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{
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filling = filled;
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if (disposed) throw new ObjectDisposedException(GetType().Name);
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if (began) throw new InvalidOperationException("Cannot begin twice.");
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primitiveBatch.Begin(filled ? PrimitiveType.TriangleStrip : PrimitiveType.LineStrip);
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began = true;
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}
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public void End()
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{
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if (disposed) throw new ObjectDisposedException(GetType().Name);
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if (!began) throw new InvalidOperationException("Cannot end before beginning.");
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primitiveBatch.End();
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began = false;
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}
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/// <summary>
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/// Draws a basic rectangle given bottom left and top right.
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/// </summary>
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/// <param name="x">X coordinate of bottom left.</param>
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/// <param name="y">Y coordinate of bottom left.</param>
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/// <param name="width">Width of rectangle.</param>
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/// <param name="height">Height of rectangle.</param>
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/// <param name="color">Color of all vertices of this rectangle.</param>
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/// <param name="rotation">Rotation of rectangle. Default is 0 radians.</param>
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public void DrawRectangle(int x, int y, int width, int height, Color color, double rotation = 0)
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{
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if (disposed) throw new ObjectDisposedException(GetType().Name);
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if (!began) throw new InvalidOperationException("Renderer must be started by calling Begin.");
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Vector2[] corners = new Vector2[4];
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corners[0] = new Vector2(x, y);
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corners[1] = new Vector2(x + (float)Math.Cos(rotation) * width, y + (float)Math.Sin(rotation) * width);
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double topRightAngleFromOrig = Math.Atan(height / (double)width);
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float origDiagonalHypotenuse = (float)Math.Sqrt(width * width * height * height);
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corners[2] = new Vector2(x + (float)Math.Cos(topRightAngleFromOrig + rotation) * origDiagonalHypotenuse, y + (float)Math.Sin(topRightAngleFromOrig + rotation) * origDiagonalHypotenuse);
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corners[3] = new Vector2(x + (float)Math.Cos(rotation + Math.PI / 4f) * height, y + (float)Math.Sin(rotation) * height);
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if (filling)
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{
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primitiveBatch.AddVertex(corners[1], color);
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primitiveBatch.AddVertex(corners[2], color);
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primitiveBatch.AddVertex(corners[0], color);
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primitiveBatch.AddVertex(corners[3], color);
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} else
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{
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primitiveBatch.AddVertex(corners[0], color);
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primitiveBatch.AddVertex(corners[1], color);
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primitiveBatch.AddVertex(corners[2], color);
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primitiveBatch.AddVertex(corners[3], color);
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}
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}
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public void Dispose()
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{
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Dispose(true);
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GC.SuppressFinalize(this);
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}
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public void Dispose(bool disposing)
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{
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if (!disposed && disposing)
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{
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if (primitiveBatch != null)
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{
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primitiveBatch.Dispose();
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}
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}
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else
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{
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if (disposed) throw new ObjectDisposedException(typeof(PrimitiveBatch).Name);
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}
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}
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}
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}
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