/// <summary>
/// Initialize the sample.
/// </summary>
protected override void Initialize()
{
// create a default world and matrix
world = Matrix.Identity;
// create the mesh array
sampleMeshes = new Model[5];
// Set up the reference grid
grid = new SampleGrid();
grid.GridColor = Color.LimeGreen;
grid.GridScale = 1.0f;
grid.GridSize = 32;
// Set the grid to draw on the x/z plane around the origin
grid.WorldMatrix = Matrix.Identity;
// set up the sample camera
camera = new SampleArcBallCamera(SampleArcBallCameraMode.RollConstrained);
camera.Distance = 3;
// orbit the camera so we're looking down the z=-1 axis,
// at the "front" of the object
camera.OrbitRight(MathHelper.Pi);
// orbit up a bit for perspective
camera.OrbitUp(.2f);
// set the initial effect, technique, and mesh
activeMesh = 1;
activeCombination = 0;
activeEffect = effectTechniqueCombinations[activeCombination, 0];
activeTechnique = effectTechniqueCombinations[activeCombination, 1];
// set the initial specular values
specularPower = 16;
specularIntensity = 1;
base.Initialize();
}
private void HandleInput(GameTime gameTime, GamePadState gpState,
KeyboardState kbState)
{
float elapsedTime = (float)gameTime.ElapsedGameTime.TotalSeconds;
//Handle input for selecting meshes
if (((gpState.Buttons.X == ButtonState.Pressed) &&
(lastGpState.Buttons.X == ButtonState.Released)) ||
(kbState.IsKeyDown(Keys.Tab) && lastKbState.IsKeyUp(Keys.Tab)))
{
//switch the active mesh
activeMesh = (activeMesh + 1) % sampleMeshes.Length;
}
//Handle input for selecting the active effect
if (((gpState.Buttons.Y == ButtonState.Pressed) &&
(lastGpState.Buttons.Y == ButtonState.Released)) ||
(kbState.IsKeyDown(Keys.Space) && lastKbState.IsKeyUp(Keys.Space)))
{
activeCombination = (activeCombination + 1) %
effectTechniqueCombinationCount;
activeEffect = effectTechniqueCombinations[activeCombination, 0];
activeTechnique = effectTechniqueCombinations[activeCombination, 1];
}
//handle mesh rotation inputs
float dx =
SampleArcBallCamera.ReadKeyboardAxis(kbState, Keys.Left, Keys.Right) +
gpState.ThumbSticks.Left.X;
float dy =
SampleArcBallCamera.ReadKeyboardAxis(kbState, Keys.Down, Keys.Up) +
gpState.ThumbSticks.Left.Y;
//apply mesh rotation to world matrix
if (dx != 0)
{
world *= Matrix.CreateFromAxisAngle(camera.Up, elapsedTime * dx);
}
if (dy != 0)
{
world *= Matrix.CreateFromAxisAngle(camera.Right, elapsedTime * -dy);
}
//handle specular power and intensity inputs
float dPower = SampleArcBallCamera.ReadKeyboardAxis(kbState,
Keys.Multiply, Keys.Divide);
if (gpState.DPad.Right == ButtonState.Pressed)
{
dPower = 1;
}
if (gpState.DPad.Left == ButtonState.Pressed)
{
dPower = -1;
}
float dIntensity = SampleArcBallCamera.ReadKeyboardAxis(kbState,
Keys.Add, Keys.Subtract);
if (gpState.DPad.Up == ButtonState.Pressed)
{
dIntensity = 1;
}
if (gpState.DPad.Down == ButtonState.Pressed)
{
dIntensity = -1;
}
if (dPower != 0)
{
specularPower *= 1 + (elapsedTime * dPower);
specularPower = MathHelper.Clamp(specularPower,
specularPowerMinimum, specularPowerMaximum);
}
if (dIntensity != 0)
{
specularIntensity *= 1 + (elapsedTime * dIntensity);
specularIntensity = MathHelper.Clamp(specularIntensity,
specularIntensityMinimum, specularIntensityMaximum);
}
}
