my map prints out a different size.
Author
I didn't know whether to start a new thread or continue with another. If someone could tell me the protocol of further question in a thread let me know. This place has been good for me so I don't want to do the wrong thing.
I am getting now the problem of reading in a map 640 X 640 pixels, with each tile 32 pixels.
So I should have 200 tiles of 32 pixel X 32 pixels..
When i print out all the tiles I don't get the whole map but it looks like 2/3 of it. It looks like the map has been scaled up when reading in so i am confused, does anyone have an idea?
I read in like this
if (FAILED(hr= D3DXCreateTextureFromFile(g_pd3dDevice,
L"grass3.bmp",&g_BackGroundFile)))
return hr;
i=0;
for (int row=0; row < bRows; row++)
for (int col=0; col < bCols; col++)
{
g_back.Col = col;
g_back.Row = row;
g_back.xMapPos =col * 32;
g_back.yMapPos =row * 32;
g_back.CanMoveOnTile =true;
g_back.TilePixelHeight =32;
g_back.TilePixelWidth =32;
g_back.TileNumber =i;
g_back.TileType =1;
i++;
}
/////print out like this
count=0;
for (int j=0; j< screenRows;j++)
for (int i=0; i< screenCols;i++)
{
{
backRect.left=g_back[count].xMapPos ;
backRect.right=backRect.left+g_back[count].TilePixelWidth ;
backRect.top=g_back[count].yMapPos ;
backRect.bottom=backRect.top+g_back[count].TilePixelHeight ;
D3DXVECTOR3 pos2=D3DXVECTOR3(
i * 32 ,
j * 32 , 1);
g_Sprite->Draw(g_BackGroundFile,&backRect,NULL,&pos2,0xFFFFFFFF);
count+=1;
of course I should only get a 640 X 480 map on the screen due to the window size but it looks like it is about 380 X 400 of the actual mapsize.
Have you double checked your screenRows and screenCols variables to make sure that they're 15 and 20?
Are you sure that this code does what you think?
The pSrcRect parameter of the ID3DXSprite::Draw function is supposed to be a rectangular area within the source texture, not a description of screen coordinates for rendering. The way you are creating your backRect indicates that you are using a 640 x 480 texture, however I suspect that you are using a 32 x 32 texture and wish to use this as a tile? If that is the case you can just pass NULL.
On the other hand if you wish to use a 640 x 480 texture you either have to specify that the texture does not have dimensions that are a power of 2 (2, 4, 8, 16, 32, 64, 128, 256, 512 etc.), or resize the image. D3DXCreateTextureFromFile assumes that the texture does have dimensions that are a power of 2 and scales your image down, which could also be the reason your map is smaller than you wished.
backRect.left=g_back[count].xMapPos ;backRect.right=backRect.left+g_back[count].TilePixelWidth ;backRect.top=g_back[count].yMapPos ;backRect.bottom=backRect.top+g_back[count].TilePixelHeight ;D3DXVECTOR3 pos2=D3DXVECTOR3(i * 32 ,j * 32 , 1);g_Sprite->Draw(g_BackGroundFile,&backRect,NULL,&pos2,0xFFFFFFFF);The pSrcRect parameter of the ID3DXSprite::Draw function is supposed to be a rectangular area within the source texture, not a description of screen coordinates for rendering. The way you are creating your backRect indicates that you are using a 640 x 480 texture, however I suspect that you are using a 32 x 32 texture and wish to use this as a tile? If that is the case you can just pass NULL.
On the other hand if you wish to use a 640 x 480 texture you either have to specify that the texture does not have dimensions that are a power of 2 (2, 4, 8, 16, 32, 64, 128, 256, 512 etc.), or resize the image. D3DXCreateTextureFromFile assumes that the texture does have dimensions that are a power of 2 and scales your image down, which could also be the reason your map is smaller than you wished.
Author
Ok, I am using screenRows and screenCols variables and I am making sure that they're 15 and 20.
Now I didn't know the map size has to be a power of 2, and I am using a 640 X 640 map. The pSrcRect I am using is for the area of the map, not where i want it on the screen. How did you see a 640 X 480 type of map being accessed, as it looks to me a square size with tile sizes 32pixels each side.
Anyway I think the most important thing is that the 640 X 640 isn't a power of 2. If the map is scaled up to 1024 size each way then that would explain what I am getting.
How do I correct this, do I need to rescale the src it or use the D3DXCreateTextureFromFileEx instead.
Now I didn't know the map size has to be a power of 2, and I am using a 640 X 640 map. The pSrcRect I am using is for the area of the map, not where i want it on the screen. How did you see a 640 X 480 type of map being accessed, as it looks to me a square size with tile sizes 32pixels each side.
Anyway I think the most important thing is that the 640 X 640 isn't a power of 2. If the map is scaled up to 1024 size each way then that would explain what I am getting.
How do I correct this, do I need to rescale the src it or use the D3DXCreateTextureFromFileEx instead.
This topic is closed to new replies.
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