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Code: Select all

void BallManager::Update()
{
	int ballid = 0;
	int blockid = 0;

	Ball *current = m_firstBall;
	Block *currentBlock = 0;

	while(current != 0)
	{
		int x = current->GetXPosition();
		int y = current->GetYPosition();
		int width = current->GetWidth();
		int height = current->GetHeight();
		int direction = current->GetDirection();
		int speed = current->GetSpeed();

		int left = x - (width / 2);
		int top = y - (height / 2);

		switch(direction)
		{
		case 0: // nw
			x -= speed;
			y -= speed;
			break;
		case 1: // ne
			x += speed;
			y -= speed;
			break;
		case 2: // sw
			x -= speed;
			y += speed;
			break;
		case 3: // se
			x += speed;
			y += speed;
			break;
		default:
			break;
		}

		current->SetPosition(x, y);

		// check for collision
		currentBlock = m_blockManager->GetBlock(0);

		blockid = 0;
		while(currentBlock != 0)
		{
			if(currentBlock->GetCollidability())
			{
				int blockx = currentBlock->GetXPosition();
				int blocky = currentBlock->GetYPosition();
				int blockwidth = currentBlock->GetWidth();
				int blockheight = currentBlock->GetHeight();
				int blockleft = blockx - (blockwidth / 2);
				int blocktop = blocky - (blockheight / 2);

				if(blockid == 0)
				{

				}

				if (top + height < blocktop)
				{
				}				
				else if (top > blocktop + blockheight)
				{
				}
				else if (left + width < blockleft)
				{
				}
				else if (left > blockleft + blockwidth)
				{
				}
				else
				{ // woohoo collision :P
					char luabuf[50];

					sprintf(luabuf, "OnCollide(%d,%d,%d);",ballid,blockid, 0);

					m_lua->DoString(luabuf);
				}
			}

			currentBlock = currentBlock->GetNext();
			blockid++;
		}

		ballid++;
		current = current->GetNext();
	}
}

Code: Select all

-- Directions (for the ball)
DIRECTION_NW	= 0;
DIRECTION_NE	= 1;
DIRECTION_SW	= 2;
DIRECTION_SE	= 3;

-- Sides (for testing which side the ball collided from)
SIDE_TOP		= 0;
SIDE_BOTTOM		= 1;
SIDE_LEFT		= 2;
SIDE_RIGHT		= 3;

Code: Select all

/* Get the functions address */
lua_getglobal(m_lua->L, "OnCollide");

/* Push the arguments */
lua_pushnumber(m_lua->L, ballid);
lua_pushnumber(m_lua->L, blockid);
lua_pushnumber(m_lua->L, 0);

/* do the actual call */.
if(lua_pcall(m_lua->L, 3, 0, 0)){ /*3 arguments, 0 results*/
	error(); /* There was an error of some sort */
}