protected override void OnSizeChanged(int w, int h, int oldw, int oldh)
{
base.OnSizeChanged(w, h, oldw, oldh);
// before measure, get the center of view
_positionX = Measurements.GetWidth(this) / 2;
_positionY = Measurements.GetHeight(this) / 2;
int d = System.Math.Min(w, h);
_buttonRadius = (int)(d / 2 * 0.25);
_joystickRadius = (int)(d / 2 * 0.75);
}
protected override void OnDraw(Canvas canvas)
{
// Set the center values
_centerX = Measurements.GetWidth(this) / 2;
_centerY = Measurements.GetHeight(this) / 2;
// Unexplainable Offsets
_centerX = _centerX * 1.5;
_centerY = _centerY * 2;
// painting the main circle
canvas.DrawCircle((int)_centerX, (int)_centerY, _joystickRadius, mainCircle);
// painting the secondary circle
canvas.DrawCircle((int)_centerX, (int)_centerY, _joystickRadius / 2, secondaryCircle);
// paint lines
canvas.DrawLine((float)_centerX, (float)_centerY, (float)_centerX,
(float)(_centerY - _joystickRadius), verticalLine);
canvas.DrawLine((float)(_centerX - _joystickRadius), (float)_centerY,
(float)(_centerX + _joystickRadius), (float)_centerY,
horizontalLine);
canvas.DrawLine((float)_centerX, (float)(_centerY + _joystickRadius),
(float)_centerX, (float)_centerY, horizontalLine);
// If this is the Initial drawing of the joystick,
// then center the control button
if (_isInitialDraw)
{
_positionX = (int)_centerX;
_positionY = (int)_centerY;
_isInitialDraw = false;
}
// painting the move button
canvas.DrawCircle(_positionX, _positionY, _buttonRadius, button);
}