private void HandleInput(GameTime gameTime, GamePadState gamePadState,
KeyboardState keyboardState)
{
float elapsedTime = (float)gameTime.ElapsedGameTime.TotalSeconds;
//Handle input for selecting meshes
if (((gamePadState.Buttons.X == ButtonState.Pressed) &&
(lastGamePadState.Buttons.X == ButtonState.Released)) ||
(keyboardState.IsKeyDown(Keys.Tab) &&
lastKeyboardState.IsKeyUp(Keys.Tab)))
{
//switch the active mesh
activeMesh = (activeMesh + 1) % sampleMeshes.Length;
}
//Handle input for selecting the active technique
if (((gamePadState.Buttons.Y == ButtonState.Pressed) &&
(lastGamePadState.Buttons.Y == ButtonState.Released)) ||
(keyboardState.IsKeyDown(Keys.Space) &&
lastKeyboardState.IsKeyUp(Keys.Space)))
{
activeTechnique = (activeTechnique + 1) % effect.Techniques.Count;
}
//handle mesh rotation inputs
float dx =
SampleArcBallCamera.ReadKeyboardAxis(keyboardState, Keys.Left,
Keys.Right) + gamePadState.ThumbSticks.Left.X;
float dy =
SampleArcBallCamera.ReadKeyboardAxis(keyboardState, Keys.Down,
Keys.Up) + gamePadState.ThumbSticks.Left.Y;
//apply mesh rotation to world matrix
if (dx != 0)
{
world = world * Matrix.CreateFromAxisAngle(camera.Up,
elapsedTime * dx);
}
if (dy != 0)
{
world = world * Matrix.CreateFromAxisAngle(camera.Right,
elapsedTime * -dy);
}
}
/// <summary>
/// Load the graphics content.
/// </summary>
protected override void LoadContent()
{
//Set up the reference grid and sample camera
grid = new SampleGrid();
grid.GridColor = Color.LimeGreen;
grid.GridScale = 1.0f;
grid.GridSize = 32;
grid.LoadGraphicsContent(graphics.GraphicsDevice);
camera = new SampleArcBallCamera(
SampleArcBallCameraMode.RollConstrained);
camera.Distance = 3;
//orbit the camera so we're looking down the z=-1 axis
//the acr-ball camera is traditionally oriented to look
//at the "front" of an object
camera.OrbitRight(MathHelper.Pi);
//orbit up a bit for perspective
camera.OrbitUp(.2f);
//load meshes
sampleMeshes = new Model[5];
sampleMeshes[0] = Content.Load <Model>("Cube");
sampleMeshes[1] = Content.Load <Model>("SphereHighPoly");
sampleMeshes[2] = Content.Load <Model>("SphereLowPoly");
sampleMeshes[3] = Content.Load <Model>("Cylinder");
sampleMeshes[4] = Content.Load <Model>("Cone");
//load texture
modelTexture = Content.Load <Texture2D>("Clouds");
//load the effect
effect = Content.Load <Effect>("TexturesAndColors");
// The parameters are no longer shared, as they were in the previous
// Shader Series sample. There is only one effect, that uses multiple
// techniques, so there is only one instance of the parameters.
worldParameter = effect.Parameters["world"];
viewParameter = effect.Parameters["view"];
projectionParameter = effect.Parameters["projection"];
lightColorParameter = effect.Parameters["lightColor"];
lightDirectionParameter = effect.Parameters["lightDirection"];
ambientColorParameter = effect.Parameters["ambientColor"];
modelTextureParameter = effect.Parameters["modelTexture"];
//create the spritebatch for debug text
spriteBatch = new SpriteBatch(graphics.GraphicsDevice);
//load the sprite font for debug text
debugTextFont = Content.Load <SpriteFont>("DebugText");
//Calculate the projection properties first on any
//load callback. That way if the window gets resized,
//the perspective matrix is updated accordingly
float aspectRatio = (float)graphics.GraphicsDevice.Viewport.Width /
(float)graphics.GraphicsDevice.Viewport.Height;
float fov = MathHelper.PiOver4 * aspectRatio * 3 / 4;
projection = Matrix.CreatePerspectiveFieldOfView(fov,
aspectRatio, .1f, 1000f);
//create a default world matrix
world = Matrix.Identity;
//grid requires a projection matrix to draw correctly
grid.ProjectionMatrix = projection;
//Set the grid to draw on the x/z plane around the origin
grid.WorldMatrix = Matrix.Identity;
// calculate the safe left and top edges of the screen
safeBounds = new Vector2(
(float)graphics.GraphicsDevice.Viewport.X +
(float)graphics.GraphicsDevice.Viewport.Width * 0.1f,
(float)graphics.GraphicsDevice.Viewport.Y +
(float)graphics.GraphicsDevice.Viewport.Height * 0.1f
);
}