/// <summary>
/// This is called when the game should draw itself.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
// Figure out our camera location. We spin around the origin based on time.
float angle = (float)gameTime.TotalGameTime.TotalSeconds;
Vector3 eye = new Vector3((float)Math.Cos(angle * .5f), 0f, (float)Math.Sin(angle * .5f)) * 12f;
eye.Y = 5f;
// Construct our view and projection matrices
Matrix view = Matrix.CreateLookAt(eye, Vector3.Zero, Vector3.Up);
Matrix projection = Matrix.CreatePerspectiveFieldOfView(
MathHelper.PiOver4, GraphicsDevice.Viewport.AspectRatio, .1f, 1000f);
// Add our shapes to be rendered
DebugShapeRenderer.AddBoundingBox(box, Color.Yellow);
DebugShapeRenderer.AddBoundingFrustum(frustum, Color.Green);
DebugShapeRenderer.AddBoundingSphere(sphere, Color.Red);
// Also add a triangle and a line
DebugShapeRenderer.AddTriangle(new Vector3(-1f, 0f, 0f), new Vector3(1f, 0f, 0f), new Vector3(0f, 2f, 0f), Color.Purple);
DebugShapeRenderer.AddLine(new Vector3(0f, 0f, 0f), new Vector3(3f, 3f, 3f), Color.Brown);
// Render our shapes now
DebugShapeRenderer.Draw(gameTime, view, projection);
base.Draw(gameTime);
}
/// <summary>
/// LoadContent will be called once per game and is the place to load
/// all of your content.
/// </summary>
protected override void LoadContent()
{
// Create a new SpriteBatch, which can be used to draw textures.
spriteBatch = new SpriteBatch(GraphicsDevice);
// Create a box that is centered on the origin and extends from (-3, -3, -3) to (3, 3, 3)
box = new BoundingBox(new Vector3(-3f), new Vector3(3f));
// Create our frustum to simulate a camera sitting at the origin, looking down the X axis, with a 16x9
// aspect ratio, a near plane of 1, and a far plane of 5
Matrix frustumView = Matrix.CreateLookAt(Vector3.Zero, Vector3.UnitX, Vector3.Up);
Matrix frustumProjection = Matrix.CreatePerspectiveFieldOfView(MathHelper.PiOver4, 16f / 9f, 1f, 5f);
frustum = new BoundingFrustum(frustumView * frustumProjection);
// Create a sphere that is centered on the origin and has a radius of 3
sphere = new BoundingSphere(Vector3.Zero, 3f);
// Initialize our renderer
DebugShapeRenderer.Initialize(GraphicsDevice);
}
