119 lines
4.0 KiB
C#
119 lines
4.0 KiB
C#
using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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using System;
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namespace RecrownedAthenaeum.Render
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{
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/// <summary>
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/// Renders rectangles using the <see cref="PrimitiveBatch"/>.
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/// </summary>
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public class RectangleRenderer : IDisposable
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{
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private bool filled;
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private bool disposed;
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/// <summary>
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/// The <see cref="PrimitiveBatch"/> used. Needs to be disposed.
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/// </summary>
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private readonly PrimitiveBatch primitiveBatch;
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/// <summary>
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/// Creates a rectangle renderer with the given <see cref="PrimitiveBatch"/>.
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/// </summary>
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/// <param name="graphicsDevice">Graphics device to use.</param>
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public RectangleRenderer(GraphicsDevice graphicsDevice)
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{
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primitiveBatch = new PrimitiveBatch(graphicsDevice);
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}
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/// <summary>
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/// Disposes the rectangle renderer.
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/// </summary>
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public void Dispose()
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{
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Dispose(true);
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}
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/// <summary>
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/// Overridable for dispose.
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/// </summary>
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/// <param name="disposing">True when its a player calling the dispose.</param>
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public virtual void Dispose(bool disposing)
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{
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if (disposed) throw new ObjectDisposedException(GetType().Name);
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if (disposing)
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{
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primitiveBatch.Dispose();
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}
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disposed = true;
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}
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/// <summary>
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/// Begins a batch for rectangles.
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/// </summary>
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/// <param name="filled">Whether or not this batch should be filled rectangles.</param>
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public void Begin(bool filled = false)
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{
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this.filled = filled;
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primitiveBatch.Begin(filled ? PrimitiveType.TriangleStrip : PrimitiveType.LineStrip);
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}
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/// <summary>
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/// Ends the batch.
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/// </summary>
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public void End()
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{
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primitiveBatch.End();
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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 Draw(int x, int y, int width, int height, Color color, float rotation = 0)
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{
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primitiveBatch.primitiveCount = filled ? 3 : 4;
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Vector2[] corners = new Vector2[4];
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corners[1] = new Vector2(width, 0);
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corners[2] = new Vector2(width, height);
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corners[3] = new Vector2(0, height);
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if (rotation != 0)
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{
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Matrix rotMat = Matrix.CreateRotationZ(rotation);
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for (int i = 0; i < corners.Length; i++)
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{
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corners[i] = Vector2.Transform(corners[i], rotMat);
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}
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}
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for (int i = 0; i < corners.Length; i++)
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{
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corners[i].X += x;
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corners[i].Y += y;
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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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primitiveBatch.AddVertex(corners[0], color);
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primitiveBatch.Flush();
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}
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/// <summary>
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/// Draws the given rectangle.
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/// </summary>
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/// <param name="rectangle">Uses the x, y and dimensions to draw a rectangle.</param>
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/// <param name="color">The color of the rectangle.</param>
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public void Draw(Rectangle rectangle, Color color)
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{
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Draw(rectangle.X, rectangle.Y, rectangle.Width, rectangle.Height, color);
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}
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}
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}
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