A Simple Side-Scrolling Shooting Game - C# Game Programming: For Serious Game Creation - page 319

The spaceship is moved around by the values in the Input class, which is
handled in the Level Update loop.
public void Update(double elapsedTime)
{
// Get controls and apply to player character
double _x ¼ _input.Controller.LeftControlStick.X;
double _y ¼ _input.Controller.LeftControlStick.Y * - 1;
Vector controlInput ¼ new Vector(_x, _y,0);
if (Math.Abs(controlInput.Length()) < 0.0001)
{
// If the input is very small, then the player may not be using
// a controller; he might be using the keyboard.
if (_input.Keyboard.IsKeyHeld(Keys.Left))
{
controlInput.X ¼ -1;
}
if (_input.Keyboard.IsKeyHeld(Keys.Right))
{
controlInput.X ¼ 1;
}
if (_input.Keyboard.IsKeyHeld(Keys.Up))
{
controlInput.Y ¼ 1;
}
if (_input.Keyboard.IsKeyHeld(Keys.Down))
{
controlInput.Y ¼ -1;
}
}
_playerCharacter.Move(controlInput * elapsedTime);
}
The controls are quite simple for the gamepad. A vector is created that describes
how the control stick is pushed (The Y axis is reversed by multiplying the value