Rectangle renderers work.

CameraTest/CameraTest.cs

@@ -107,42 +107,13 @@ namespace CameraTest
         protected override void Draw(GameTime gameTime)
         {
             GraphicsDevice.Clear(Color.Black);
+            rr.Begin(true);
             rr.Draw(25, 25, 70, 70, Color.Purple);
-            /*
+            rr.End();
-             *             float rotation = 0;
-                        double width = 20;
-                        double height = 20;
-                        int x = 50;
-                        int y = 50;
-                        double topRightAngleFromOrig = Math.Atan(height / width);
-                        pb.Begin(PrimitiveType.LineList);
 
-
+            rr.Begin(false);
-                        Vector2 bottomLeft = new Vector2(x, y);
+            rr.Draw(75, 75, 70, 70, Color.Green);
-                        Vector2 bottomRight = new Vector2(x + (float)(Math.Cos(rotation) * width), y + (float)(Math.Sin(rotation) * width));
+            rr.End();
-                        float origDiagonalHypotenuse = (float)Math.Sqrt(width * width + height * height);
-                        Vector2 topRight = new Vector2(x + (float)Math.Cos(topRightAngleFromOrig + rotation) * origDiagonalHypotenuse, y + (float)Math.Sin(topRightAngleFromOrig + rotation) * origDiagonalHypotenuse);
-                        Vector2 topLeft = new Vector2(x - (float)(Math.Cos((Math.PI / 2f) - rotation) * height), y + (float)(Math.Sin((Math.PI / 2f) - rotation) * height));
-
-                        verts[0] = bottomLeft;
-                        verts[1] = bottomRight;
-                        verts[2] = topRight;
-                        verts[3] = topLeft;
-
-                        vertposcol[0] = new VertexPositionColor(new Vector3(verts[0], 0), Color.White);
-                        vertposcol[1] = new VertexPositionColor(new Vector3(verts[1], 0), Color.White);
-                        vertposcol[2] = new VertexPositionColor(new Vector3(verts[2], 0), Color.White);
-                        vertposcol[3] = new VertexPositionColor(new Vector3(verts[3], 0), Color.White);
-
-                        EffectTechnique effectTechnique = be.Techniques[0];
-                        EffectPassCollection effectPassCollection = effectTechnique.Passes;
-                        foreach (EffectPass pass in effectPassCollection)
-                        {
-                            pass.Apply();
-                            GraphicsDevice.DrawUserPrimitives(PrimitiveType.LineStrip, vertposcol, 0, 4);
-                        }
-                        pb.End(); 
-             */
             base.Draw(gameTime);
         }
     }

Demo/Demo.cs

@@ -31,16 +31,13 @@ namespace Demo
         {
             // TODO: Add your initialization logic here
             basicEffect = new BasicEffect(GraphicsDevice);
-            basicEffect.View = Matrix.CreateLookAt(new Vector3(graphics.PreferredBackBufferWidth/2f, graphics.PreferredBackBufferHeight/2f, 1f), Vector3.Forward, Vector3.Up);
-            basicEffect.World = Matrix.Identity;
-            basicEffect.Projection = Matrix.CreateOrthographic(GraphicsDevice.Viewport.Width, GraphicsDevice.Viewport.Height, 0, 1);
             basicEffect.VertexColorEnabled = true;
 
-            vertices = new VertexPositionColor[5];
+            vertices = new VertexPositionColor[4];
-            vertices[0] = new VertexPositionColor(new Vector3(5, 5, 0), Color.Red);
+            vertices[0] = new VertexPositionColor(new Vector3(0, 0, 0), Color.Red);
-            vertices[1] = new VertexPositionColor(new Vector3(10, 5, 0), Color.Red);
+            vertices[1] = new VertexPositionColor(new Vector3(10, 0, 0), Color.Red);
             vertices[2] = new VertexPositionColor(new Vector3(10, 10, 0), Color.Red);
-            vertices[3] = new VertexPositionColor(new Vector3(5, 10, 0), Color.Red);
+            vertices[3] = new VertexPositionColor(new Vector3(0, 10, 0), Color.Red);
             base.Initialize();
         }
 
@@ -52,6 +49,7 @@ namespace Demo
         {
             // Create a new SpriteBatch, which can be used to draw textures.
             spriteBatch = new SpriteBatch(GraphicsDevice);
+            basicEffect.World = Matrix.CreateOrthographicOffCenter(new Rectangle(0, 0, GraphicsDevice.Viewport.Width, GraphicsDevice.Viewport.Height), 0, 1);
 
             // TODO: use this.Content to load your game content here
         }

RecrownedAthenaeum.sln

@@ -11,8 +11,6 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "RecrownedAthenaeum.Tools",
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CameraTest", "CameraTest\CameraTest.csproj", "{4A9796EE-D10D-4ED8-AE6E-9CE96C3D4FE9}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Demo", "Demo\Demo.csproj", "{A56A7DFD-C5E7-4D9B-9A9F-25F94EC824BD}"
-EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -35,10 +33,6 @@ Global
 		{4A9796EE-D10D-4ED8-AE6E-9CE96C3D4FE9}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{4A9796EE-D10D-4ED8-AE6E-9CE96C3D4FE9}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{4A9796EE-D10D-4ED8-AE6E-9CE96C3D4FE9}.Release|Any CPU.Build.0 = Release|Any CPU
-		{A56A7DFD-C5E7-4D9B-9A9F-25F94EC824BD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{A56A7DFD-C5E7-4D9B-9A9F-25F94EC824BD}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{A56A7DFD-C5E7-4D9B-9A9F-25F94EC824BD}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{A56A7DFD-C5E7-4D9B-9A9F-25F94EC824BD}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

RecrownedAthenaeum/Camera/Camera3D.cs

@@ -76,7 +76,7 @@ namespace RecrownedAthenaeum.Camera
         public virtual void Apply()
         {
             ViewMatrix = Matrix.CreateLookAt(position, lookAt, upDirection);
-            TransformationMatrix = worldMatrix * ViewMatrix * projectionMatrix;
+            TransformationMatrix = projectionMatrix * ViewMatrix * worldMatrix;
         }
 
         /// <summary>

RecrownedAthenaeum/Render/PrimitiveBatch.cs

@@ -15,17 +15,18 @@ namespace RecrownedAthenaeum.Render
         int bufferPosition;
         BasicEffect basicEffect;
         PrimitiveType primitiveType;
+        private int verticesPerPrimitive;
 
         /// <summary>
-        /// Sets the vertices per primitive. Default is dependent on the primitive type. Lists will generally satisfy the amount of vertices they need, while strips should be set or it will all be interconnected.
+        /// Amount of primitives.
         /// </summary>
-        public int verticesPerPrimitive;
+        public int primitiveCount;
 
         GraphicsDevice graphicsDevice;
         bool began;
         bool disposed;
         Camera3D camera;
-
+        
         /// <summary>
         /// Creates a batch used to draw primitives.
         /// </summary>
@@ -55,7 +56,8 @@ namespace RecrownedAthenaeum.Render
             {
                 case PrimitiveType.LineList: verticesPerPrimitive = 2; break;
                 case PrimitiveType.TriangleList: verticesPerPrimitive = 3; break;
-                default: verticesPerPrimitive = 1; break;
+                case PrimitiveType.LineStrip: verticesPerPrimitive = 1; break;
+                case PrimitiveType.TriangleStrip: verticesPerPrimitive = 3; break;
             }
             basicEffect.World = camera.worldMatrix;
             basicEffect.View = camera.ViewMatrix;
@@ -108,18 +110,21 @@ namespace RecrownedAthenaeum.Render
 
         /// <summary>
         /// Flushes the batch. Automatically called if required if using <see cref="PrimitiveType.LineList"/> or <see cref="PrimitiveType.TriangleList"/>. Otherwise, manual flushing is required.
+        /// <see cref="primitiveCount"/> is used if not zero. Is reset to zero every flush.
         /// </summary>
         public void Flush()
         {
             if (!began) throw new InvalidOperationException("Begin needs to be called before flushing.");
             if (disposed) throw new ObjectDisposedException(this.GetType().Name);
             if (bufferPosition == 0) return;
+            if (primitiveCount == 0) primitiveCount = bufferPosition / verticesPerPrimitive; 
             foreach (EffectPass effectPass in basicEffect.CurrentTechnique.Passes)
             {
                 effectPass.Apply();
-                graphicsDevice.DrawUserPrimitives(primitiveType, vertices, 0, bufferPosition/verticesPerPrimitive);
+                graphicsDevice.DrawUserPrimitives(primitiveType, vertices, 0, primitiveCount);
             }
             bufferPosition = 0;
+            primitiveCount = 0;
         }
 
         /// <summary>

RecrownedAthenaeum/Render/RectangleRenderer.cs

@@ -10,6 +10,7 @@ namespace RecrownedAthenaeum.Render
     /// </summary>
     public class RectangleRenderer : IDisposable
     {
+        private bool filled;
         private bool disposed;
         /// <summary>
         /// The <see cref="PrimitiveBatch"/> used. Needs to be disposed.
@@ -23,7 +24,7 @@ namespace RecrownedAthenaeum.Render
         /// <param name="graphicsDevice">Graphics device to use. Default will use <see cref="Configuration"/>.</param>
         public RectangleRenderer(Camera2D camera = null, GraphicsDevice graphicsDevice = null)
         {
-            primitiveBatch = new PrimitiveBatch(camera, graphicsDevice, 4);
+            primitiveBatch = new PrimitiveBatch(camera, graphicsDevice);
         }
 
         /// <summary>
@@ -48,6 +49,23 @@ namespace RecrownedAthenaeum.Render
             disposed = true;
         }
 
+        /// <summary>
+        /// Begins a batch for rectangles.
+        /// </summary>
+        /// <param name="filled">Whether or not this batch should be filled rectangles.</param>
+        public void Begin(bool filled = false)
+        {
+            this.filled = filled;
+            primitiveBatch.Begin(filled ? PrimitiveType.TriangleStrip : PrimitiveType.LineStrip);
+        }
+
+        /// <summary>
+        /// Ends the batch.
+        /// </summary>
+        public void End()
+        {
+            primitiveBatch.End();
+        }
         /// <summary>
         /// Draws a basic rectangle given bottom left and top right.
         /// </summary>
@@ -58,35 +76,29 @@ namespace RecrownedAthenaeum.Render
         /// <param name="color">Color of all vertices of this rectangle.</param>
         /// <param name="rotation">Rotation of rectangle. Default is 0 radians.</param>
         /// <param name="filled">If this rectangle should be filled.</param>
-        public void Draw(int x, int y, int width, int height, Color color, double rotation = 0, bool filled = false)
+        public void Draw(int x, int y, int width, int height, Color color, float rotation = 0)
         {
-            primitiveBatch.Begin(filled ? PrimitiveType.TriangleStrip : PrimitiveType.LineStrip);
+            primitiveBatch.primitiveCount = filled ? 3 : 4;
-
             Vector2[] corners = new Vector2[4];
-
-            double topRightAngleFromOrig = Math.Atan((double)height / width);
             corners[0] = new Vector2(x, y);
-            corners[1] = new Vector2(x + (float)Math.Cos(rotation) * width, y + (float)Math.Sin(rotation) * width);
+            corners[1] = new Vector2(x + width, y);
-            float origDiagonalHypotenuse = (float)Math.Sqrt((width * width) + (height * height));
+            corners[2] = new Vector2(x + width, y + height);
-            corners[2] = new Vector2(x + (float)Math.Cos(topRightAngleFromOrig + rotation) * origDiagonalHypotenuse, y + (float)Math.Sin(topRightAngleFromOrig + rotation) * origDiagonalHypotenuse);
+            corners[3] = new Vector2(x, y + height);
-            corners[3] = new Vector2(x - (float)(Math.Cos((Math.PI / 2f) - rotation) * height), y + (float)(Math.Sin((Math.PI / 2f) - rotation) * height));
 
-            if (filled)
+            if (rotation != 0)
             {
-                primitiveBatch.AddVertex(corners[1], color);
+                Matrix rotMat = Matrix.CreateRotationZ(rotation);
-                primitiveBatch.AddVertex(corners[2], color);
+                for (int i = 0; i < corners.Length; i++)
-                primitiveBatch.AddVertex(corners[0], color);
+                {
-                primitiveBatch.AddVertex(corners[3], color);
+                    Vector2.Transform(corners[i], rotMat);
-            }
+                }
-            else
-            {
-                primitiveBatch.AddVertex(corners[0], color);
-                primitiveBatch.AddVertex(corners[1], color);
-                primitiveBatch.AddVertex(corners[2], color);
-                primitiveBatch.AddVertex(corners[3], color);
             }
 
-            primitiveBatch.End();
+            primitiveBatch.AddVertex(corners[0], color);
+            primitiveBatch.AddVertex(corners[1], color);
+            primitiveBatch.AddVertex(corners[2], color);
+            primitiveBatch.AddVertex(corners[3], color);
+            primitiveBatch.AddVertex(corners[0], color);
         }
     }
 }