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==UV/Image Window==

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nice alpha grid drawing. dont follow image.
This commit is contained in:
Campbell Barton
2007-10-24 21:51:49 +00:00
parent 16637204fd
commit cbcaa31909
1 changed files with 40 additions and 25 deletions
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65
source/blender/src/drawimage.c
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@@ -1704,11 +1704,13 @@ static void imagespace_grid(SpaceImage *sima)
}
#define ALPHA_CHECKSIZE 30
static void sima_draw_alpha_backdrop(SpaceImage *sima, float x1, float y1, float xsize, float ysize)
{
float tile= sima->zoom*15.0f;
float tile= ALPHA_CHECKSIZE/2;
float x, y, maxx, maxy;
float xstart, ystart;
int checker_type = 0;
glColor3ub(100, 100, 100);
glRectf(x1, y1, x1 + sima->zoom*xsize, y1 + sima->zoom*ysize);
glColor3ub(160, 160, 160);
@@ -1716,33 +1718,46 @@ static void sima_draw_alpha_backdrop(SpaceImage *sima, float x1, float y1, float
maxx= x1+sima->zoom*xsize;
maxy= y1+sima->zoom*ysize;
for(x=0; x<xsize; x+=30) {
for(y=0; y<ysize; y+=30) {
float fx= x1 + sima->zoom*x;
float fy= y1 + sima->zoom*y;
float tilex= tile, tiley= tile;
if(fx+tile > maxx)
tilex= maxx-fx;
if(fy+tile > maxy)
tiley= maxy-fy;
glRectf(fx, fy, fx + tilex, fy + tiley);
xstart = fmod((float)sima->xof*sima->zoom, ALPHA_CHECKSIZE);
ystart = fmod((float)sima->yof*sima->zoom, ALPHA_CHECKSIZE);
if (xstart>0) xstart-=ALPHA_CHECKSIZE;
if (ystart>0) ystart-=ALPHA_CHECKSIZE;
ystart = ystart/sima->zoom;
xstart = xstart/sima->zoom;
while (checker_type != 2) {
/* there are only 2 checker_type's - 0 or 1 , offset the quads to make check's second time round */
if (checker_type==1) {
xstart -= ALPHA_CHECKSIZE*0.5/sima->zoom;
ystart -= ALPHA_CHECKSIZE*0.5/sima->zoom;
}
}
for(x=15; x<xsize; x+=30) {
for(y=15; y<ysize; y+=30) {
for(x=xstart; x<xsize; x+=ALPHA_CHECKSIZE/sima->zoom) {
float fx= x1 + sima->zoom*x;
float fy= y1 + sima->zoom*y;
float tilex= tile, tiley= tile;
if (fx+tile < x1)
continue;
if(fx+tile > maxx)
tilex= maxx-fx;
if(fy+tile > maxy)
tiley= maxy-fy;
glRectf(fx, fy, fx + tilex, fy + tiley);
for(y=ystart; y<ysize; y+=ALPHA_CHECKSIZE/sima->zoom) {
float fy= y1 + sima->zoom*y;
float tilex= tile, tiley= tile;
/* skip min values */
if (fy+tile<y1)
continue;
/* clip max values */
if(fx+tile > maxx)
tilex= maxx-fx;
if(fy+tile > maxy)
tiley= maxy-fy;
glRectf(MAX2(fx, x1), MAX2(fy, y1), fx + tilex, fy + tiley);
}
}
checker_type++;
}
}