/// <summary>
/// Update the camera.
/// </summary>
public static void Update(GameTime gameTime)
{
// if we don't have any input, don't bother
if (inputState == null)
{
return;
}
// Calculate the camera's current position.
if (inputState.ResetCamera)
{
Reset(aspectRatio);
}
float totalMilliseconds = (float)gameTime.ElapsedGameTime.TotalMilliseconds;
// check for input to rotate the camera up and down around the model
if (inputState.IsKeyPress(Keys.Up))
{
cameraArc += totalMilliseconds * 0.1f;
}
else if (inputState.IsKeyPress(Keys.Down))
{
cameraArc -= totalMilliseconds * 0.1f;
}
cameraArc += inputState.CurrentGamePadStates[0].ThumbSticks.Right.Y *
totalMilliseconds * 0.25f;
// limit the arc movement
if (cameraArc > 90.0f)
{
cameraArc = 90.0f;
}
else if (cameraArc < -90.0f)
{
cameraArc = -90.0f;
}
// check for input to rotate the camera around the model
if (inputState.IsKeyPress(Keys.Right))
{
cameraRotation += totalMilliseconds * 0.1f;
}
else if (inputState.IsKeyPress(Keys.Left))
{
cameraRotation -= totalMilliseconds * 0.1f;
}
cameraRotation += inputState.CurrentGamePadStates[0].ThumbSticks.Right.X *
totalMilliseconds * 0.25f;
// limit camera to one rotation
while (cameraRotation > 360f)
{
cameraRotation -= 360f;
}
while (cameraRotation < 0f)
{
cameraRotation += 360f;
}
// Check for input to zoom camera in and out
if (inputState.IsKeyPress(Keys.Z))
{
cameraDistance += totalMilliseconds;
}
else if (inputState.IsKeyPress(Keys.X))
{
cameraDistance -= totalMilliseconds;
}
cameraDistance += inputState.CurrentGamePadStates[0].Triggers.Left *
totalMilliseconds;
cameraDistance -= inputState.CurrentGamePadStates[0].Triggers.Right *
totalMilliseconds;
// limit the camera distance.
if (cameraDistance > 5000.0f)
{
cameraDistance = 5000.0f;
}
else if (cameraDistance < 350.0f)
{
cameraDistance = 350.0f;
}
// recreate the view matrix
view = Matrix.CreateRotationY(MathHelper.ToRadians(cameraRotation)) *
Matrix.CreateRotationX(MathHelper.ToRadians(cameraArc)) *
Matrix.CreateLookAt(new Vector3(0, 0, -cameraDistance),
Vector3.Zero, Vector3.Up);
}
