private void CheckCollision()
{
// ball and paddle
Rect rect = ball.GetRect();
rect.Intersect(paddle.GetRect());
if (!rect.IsEmpty)
{
// paddle 100 px
// ball position 0-100
double ballPosition = ball.LocationX - paddle.LocationX;
// -0.5 <-> 0.5
double hitPercent = (ballPosition / paddle.Width) - 0.5;
// set ball speed
ball.SetSpeed(hitPercent);
}
// ball and blocks
foreach (Block block in blocks)
{
Rect ballRect = ball.GetRect();
ballRect.Intersect(block.GetRect());
if (!ballRect.IsEmpty)
{
// remove from List collection
blocks.Remove(block);
// remove from Canvas
canvas.Children.Remove(block);
// ball SpeedX and SpeedY?
double ballCenter = ball.LocationX + (ball.Width) / 2;
if (ballCenter < block.LocationX || ballCenter > (block.LocationX + block.Width))
{
ball.SpeedX *= -1;
}
else
{
ball.SpeedY *= -1;
}
// break
break;
}
}
}
void tmr_Tick(object sender, EventArgs e)
{
Point res;
for (int iBall = 0; iBall < _NumBalls; iBall++)
{
// first we see if the ball will collide
// with the frame, the paddle or the blocks
var ball = _balls[iBall];
if (!ball.IsDead)
{
// first see if it hits the walls
res = WillCollide(
ball,
ClientRectangle, // rect of whole frame
fShouldBeInside: true);
if (res.X == 0 && res.Y == 0) //didn't hit
{
// see if it hits paddle
res = WillCollide(
ball,
_paddle.GetRect(), // rect of paddle
fShouldBeInside: false);
if (res.X == 0 && res.Y == 0) //didn't hit
{
// see if it hits any block
if (_numBlocksAlive == 0)
{
_nLevels++;
_nBlocksY++;
// reward: bring back some balls
int nBallsToBringBackToLife = 0;
for (int i = 0; i < _NumBalls; i++)
{
if (_balls[i].IsDead)
{
_balls[i].IsDead = false;
_balls[i]._pos.X = 100 + 10 * i;
_balls[i]._pos.Y = 100 + 10 * i;
_NumBallsAlive++;
Invalidate(_balls[i].GetRect());
if (++nBallsToBringBackToLife == 3)
{
break;
}
}
}
MakeBlocks();
}
else
{
for (int i = 0; i < _nBlocksX; i++)
{
for (int j = 0; j < _nBlocksY; j++)
{
if (!_blocks[i, j].IsDead)
{
res = WillCollide(
ball,
_blocks[i, j].GetRect(),
fShouldBeInside: false);
if (res.X != 0 || res.Y != 0)
{
Beep(100, 10);
_blocks[i, j].IsDead = true;
_numBlocksAlive--;
_Score++;
Invalidate(_blocks[i, j].GetRect());
}
}
}
}
}
}
else
{// hit paddle
Beep(400, 10);
}
}
else
{ // did hit frame edge
if (res.Y == -1)
{ // hit bottom of frame
ball.IsDead = true;
Invalidate(ball.GetRect());
_NumBallsAlive--;
}
}
// now we can move the ball
Invalidate(ball.GetRect());
ball._pos.X += ball._velocity.X;
ball._pos.Y += ball._velocity.Y;
Invalidate(ball.GetRect());
}
}
if (_NumBallsAlive == 0)
{
this._timer.Enabled = false;
}
this.Text = string.Format(
"Blocks by Calvin Hsia. Score = {0} # Levels = {1} # of balls left = {2}",
_Score,
_nLevels,
_NumBallsAlive);
}
