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# Splitting a bmp into small pieces

Posted on 2001-07-31
Medium Priority
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Hi there,
I need a code example of how to split a bmp into small pieces. My problem:

I have a large bmp with tiles on it (for use in a tiled based game) only, it's like 14tiles x 30tiles in size. A tile is 48x48 and there is a 3 pixel sperater around the tiles, ie....

------------------
|    ||    ||    |
|    ||    ||    |
------------------

Kinda like that. I need to know how i can load a bmp up and have eg:

Tile height: ??
Tile width: ??
Skip width: ??
Skip height: ??

The values would be (for my purpose):
48,48,3,3

If anyone can help me, please do so.

Thanks
Stephen
0
Question by:St3v13
• 2

Author Comment

ID: 6338174
Btw, the program will then spit out seperate bmps of the sperate tiles.

Thanks
Stephen
0

LVL 27

Expert Comment

ID: 6338200
sorry had no time to code, but its not so heavy to solve

the heart, beside the calculation is the bitmap.canvas.copyrect-method
or as alternative the bitblt-api funtion
to copy a part from the source bitmap into the new one

meikl ;-)
0

LVL 2

Accepted Solution

bugroger earned 780 total points
ID: 6338832
Hi,
Try this code:

Type
TXYWH     = Record
x, y, w, h : integer;
End;
TTileXY   = array of TXYWH;

//Calc the XYPos in the Source-Bitmap and
//the width, height
//SkipL/R/T/B are Left, Right, Top, Bottom
Procedure CalcTileXY(VAR _TileXY : TTileXY;
horzCount, vertCount, TileHeight, TileWidth,
SkipL, SkipR, SkipT, SkipB : Integer);
VAR
x, y, i : integer;

Begin
SetLength(_TileXY, horzCount * vertCount);
i := 0;
For y := 0 to (vertCount -1) do
For x := 0 to (horzCount -1) do
Begin
_TileXY[i].x := (x * TileWidth) + SkipL;
_TileXY[i].y := (y * TileHeight) + SkipT;
_TileXY[i].w := TileWidth - (SkipL + SkipR);
_TileXY[i].h := TileHeight - (SkipT + SkipB);
Inc(i);
End;
End;

// TileNo from 1 to ...
Procedure GetTileBitmap(SourceBitmap : TBitmap; VAR DestBitmap : TBitmap;
_TileXY : TTileXY; TileNo : Cardinal);
Begin
Dec(TileNo);
DestBitmap.Canvas.CopyRect(
Rect(0,0, _TileXY[TileNo].w , _TileXY[TileNo].h ),
SourceBitmap.Canvas,
Rect(_TileXY[TileNo].x, _TileXY[TileNo].y,
_TileXY[TileNo].x + _TileXY[TileNo].w,
_TileXY[TileNo].y + _TileXY[TileNo].h));
End;

Procedure DestroyTileXY(VAR _TileXY : TTileXY);
Begin
SetLength(_TileXY, 0);
End;

-----------------------------------
example how to use these functions:
-----------------------------------

VAR
TileXY : TTileXY;
TileBitmap : TBitmap;

begin
CalcTileXY(TileXY, 5, 5, 50, 50, 1, 1, 1, 1);
TileBitmap := TBitmap.Create;
TileBitmap.Width := TileXY[0].w;
TileBitmap.height := TileXY[0].h;
GetTileBitmap(Image1.Picture.Bitmap, TileBitmap, TileXY, StrToInt(Edit1.Text));
Image2.Canvas.Draw(0,0, TileBitmap);
DestroyTileXY(TileXY);
TileBitmap.Free;
end;

GL
Bug
0

Author Comment

ID: 6338865
Excellent answer! Thanks so much for your time and effort. I hope these 195 points are enough :-)

Regards
Stephen
0

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