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Problem with isometric clipping/smooth scrolling

General and Gameplay Programming Programming

Started by Misogynator August 24, 2001 01:55 AM

1 comment, last by Misogynator 23 years, 6 months ago

Misogynator

Author

122

August 24, 2001 01:55 AM

So smooth scrolling(and the clipping to make it look good) was easy with square tile maps, but for some reason I can''t quite get it to work with iso maps, except for the right side of the screen, which clips perfectly. I''m hoping there''s some obvious typo or something, so here goes:

  
void cTerrain::drawTerrain(DDBLTFX ddbltfx)
{	
	scrollX = worldCameraX / TILE_SIZE_X;
	scrollY = worldCameraY / (RHOMBUS_SIZE_Y / 2);
	
	offsetY = worldCameraY & (RHOMBUS_SIZE_Y / 2 - 1);
	offsetX = worldCameraX & (TILE_SIZE_X - 1);

	for (y = scrollY, screenY = 0; y <= scrollY + (SCREEN_SIZE_Y * 4); y++, screenY++)
	{
		
	        terrainSource.top = 0;//(terrainDesc[x][y] * TILE_SIZE_Y) + tOff;

		terrainSource.bottom = 32;//= (terrainSource.top + TILE_SIZE_Y) - bOff;

		
		terrainDest.top = (screenY * (RHOMBUS_SIZE_Y / 2 + 1)) - offsetY;
		terrainDest.bottom = terrainDest.top + TILE_SIZE_Y;		
		
		if (terrainDest.top < 0)
		{	
			terrainDest.top += -terrainDest.top;
			terrainSource.top = -terrainDest.top;
		}
		
		else if (terrainDest.bottom > (SCREEN_SIZE_Y * TILE_SIZE_Y))
		{
			terrainDest.bottom -= terrainDest.bottom - (SCREEN_SIZE_Y * TILE_SIZE_Y);
			terrainSource.bottom = terrainDest.bottom - (SCREEN_SIZE_Y * TILE_SIZE_Y);
		}
		
		for (x = scrollX, screenX = 0; x <= scrollX + SCREEN_SIZE_X; x++, screenX++)
		{
				

				terrainSource.left = 0;
				terrainSource.right = TILE_SIZE_X;			
			
				terrainDest.left = (screenX * TILE_SIZE_X + ((y & 1) * (TILE_SIZE_X / 2))) - offsetX;
				terrainDest.right = terrainDest.left + TILE_SIZE_X;

				
				if (terrainDest.left < 0)
				{
					terrainSource.left += -terrainDest.left;			terrainDest.left += -terrainDest.left;1) * TILE_SIZE_X /2);
				}
				
				
				else if (terrainDest.right > (SCREEN_SIZE_X * TILE_SIZE_X))
				{
					terrainSource.right += (SCREEN_SIZE_X * TILE_SIZE_X) - terrainDest.right;
					terrainDest.right += (SCREEN_SIZE_X * TILE_SIZE_X) - terrainDest.right;
				}
				
				
				
				g_DDSBack->Blt(&terrainDest,
				g_DDSSprites1,
				&terrainSource,
				DDBLT_WAIT | DDBLT_KEYSRC | DDBLT_DDFX,
				&ddbltfx);
				

		}
		
		
	}

}

Misogynator

Author

122

August 24, 2001 02:38 AM

this line:

  terrainDest.left += -terrainDest.left;1) * TILE_SIZE_X /2);

obviously has a typo - everyhing after the 1st semicolon was a commented line that was only partially deleted. Plus the whole statement should be on the next line, obviously. Sorry bout that.

Misogynator

Author

122

August 24, 2001 02:39 AM

ermm..heh there needs to be an edit message option. Anyway, the last post wasn''t to say I fixed it, rather it was just a clarification.

Problem with isometric clipping/smooth scrolling

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