/// <summary>
/// ��齫Ҫ�����߽�����б�Ҫ��ʱ��ת��ķ���
/// </summary>
/// <param name="ball">�ж��Ƿ���ײ���������</param>
private void DetectWallCollision(Ball ball)
{
bool hit = false;
if ((ball.Right + ball.XSpeed >this.Width-12) //�ұ߽�
|| (ball.Left + ball.XSpeed < borderWidth)) //��߽�
{
hit = true;
ball.ReverseX();
}
if (ball.Top + ball.YSpeed < borderWidth)//�ϱ߽�
{
hit = true;
ball.ReverseY();
if (ball.FromPaddle)
ball.ReverseY();//����ɳ�ȥ
}
if (hit && !ball.FromPaddle)
{
wallSound.Play();
}
}
/// <summary>
/// Checks if the ball is about to hit the side or top walls, and reverses it's direction if necessary
/// </summary>
/// <param name="ball">The ball to check for collision</param>
private void DetectWallCollision(Ball ball)
{
bool hit = false;
if ((ball.Right + ball.XSpeed > this.Width - borderWidth) //right border
|| (ball.Left + ball.XSpeed < borderWidth)) //left border
{
hit = true;
ball.ReverseX();
}
//is the ball about to hit the top border?
if (ball.Top + ball.YSpeed < borderWidth)
{
hit = true;
ball.ReverseY();
}
if (hit) { wallSound.Play(); }
}
/// <summary>
/// �����������ש�����ײ�Ƿ���������������ж����ש������û���������
/// </summary>
/// <param name="ball">Ҫ������</param>
/// <param name="bricks">Ҫ�����Ƿ��е��ߵ�ש��</param>
private void CheckBricks(Ball ball, Brick[,] bricks)
{
bool ultimatelyReverseX = false; //����������ȷ����ֻ����һ��ʱ���ڱ���תһ��
bool ultimatelyReverseY = false; //���������ֱ���ת����ֱ�Ӵ���ש������
foreach (Brick brick in bricks)
{
bool hit, reverseX, reverseY;
if (brick.Strength > 0) //ש��û������ʱ����Ƿ�����ײ
{
//ִ����ײ���
DetectBrickCollision(ball, brick, out hit, out reverseX, out reverseY);
if (hit)
{
brick.Hit(); //��ש���һ��Ѫ
if (brick.Strength == 0)//ש��Ѫ��Ϊ0��ʱ��Ӧ����ʧ
{
CheckBrickForPowerUps(brick); //���ש�����Ƿ����������
brickCount--; //��ש������1
}
score += level * brick.CalculateScore();
brickSound.Play();
if (reverseX) ultimatelyReverseX = true;
if (reverseY) ultimatelyReverseY = true;
}
}
}
if (ultimatelyReverseY) ball.ReverseY();
if (ultimatelyReverseX) ball.ReverseX();
}
/// <summary>
/// Given a ball and brick, checks them for collision
/// if they collide, checks if the brick had powerups inside it
/// </summary>
/// <param name="ball">Ball object to check for collision</param>
/// <param name="bricks">Brick object to check for powerups</param>
private void CheckBricks(Ball ball, Brick[,] bricks)
{
bool ultimatelyReverseX = false; //these variables exist so that the ball can only be reversed
bool ultimatelyReverseY = false; //once per timer tick, otherwise sometimes the ball can be reversed twice
//and plough right through bricks
foreach (Brick brick in bricks)
{
bool hit, reverseX, reverseY;
if (brick.Strength > 0) //only detect collision if the brick hasn't been hit
{
//perform collision detection
DetectBrickCollision(ball, brick, out hit, out reverseX, out reverseY);
if (hit)
{
brick.Hit(); //subtract the strength
if (brick.Strength == 0)
{
CheckBrickForPowerUps(brick); //check if the brick had any powerups
brickCount--; //update the new brickcount
}
score += level * brick.CalculateScore();
brickSound.Play();
if (reverseX) ultimatelyReverseX = true;
if (reverseY) ultimatelyReverseY = true;
}
}
}
if (ultimatelyReverseY) ball.ReverseY();
if (ultimatelyReverseX) ball.ReverseX();
}