double rect_overlap(int x1, int y1, int x2, int y2, int X1, int Y1,
int X2, int Y2) {
double a, A, o;
sraRegionPtr r, R;
sraRectangleIterator *iter;
sraRect rt;
a = nabs((x2 - x1) * (y2 - y1));
A = nabs((X2 - X1) * (Y2 - Y1));
r = sraRgnCreateRect(x1, y1, x2, y2);
R = sraRgnCreateRect(X1, Y1, X2, Y2);
sraRgnAnd(r, R);
o = 0.0;
iter = sraRgnGetIterator(r);
while (sraRgnIteratorNext(iter, &rt)) {
o += nabs( (rt.x2 - rt.x1) * (rt.y2 - rt.y1) );
}
sraRgnReleaseIterator(iter);
sraRgnDestroy(r);
sraRgnDestroy(R);
if (a < A) {
o = o/a;
} else {
o = o/A;
}
return o;
}
sraRectangleIterator *sraRgnGetReverseIterator(sraRegion *s,rfbBool reverseX,rfbBool reverseY)
{
sraRectangleIterator *i = sraRgnGetIterator(s);
if(reverseY) {
i->sPtrs[1] = &(s->front);
i->sPtrs[0] = &(s->back);
}
i->reverseX = reverseX;
i->reverseY = reverseY;
return(i);
}
/* pipe the output to sort|uniq -u and you'll get the errors. */
int main(int argc, char** argv)
{
sraRegionPtr region, region1, region2;
sraRectangleIterator* i;
sraRect rect;
rfbBool b;
region = sraRgnCreateRect(10, 10, 600, 300);
region1 = sraRgnCreateRect(40, 50, 350, 200);
region2 = sraRgnCreateRect(0, 0, 20, 40);
sraRgnPrint(region);
printf("\n[(10-300)[(10-600)]]\n\n");
b = sraRgnSubtract(region, region1);
printf("%s ",b?"true":"false");
sraRgnPrint(region);
printf("\ntrue [(10-50)[(10-600)](50-200)[(10-40)(350-600)](200-300)[(10-600)]]\n\n");
sraRgnOr(region, region2);
printf("%ld\n6\n\n", sraRgnCountRects(region));
i = sraRgnGetIterator(region);
while(sraRgnIteratorNext(i, &rect))
printf("%dx%d+%d+%d ",
rect.x2-rect.x1,rect.y2-rect.y1,
rect.x1,rect.y1);
sraRgnReleaseIterator(i);
printf("\n20x10+0+0 600x30+0+10 590x10+10+40 30x150+10+50 250x150+350+50 590x100+10+200 \n\n");
i = sraRgnGetReverseIterator(region,1,0);
while(sraRgnIteratorNext(i, &rect))
printf("%dx%d+%d+%d ",
rect.x2-rect.x1,rect.y2-rect.y1,
rect.x1,rect.y1);
sraRgnReleaseIterator(i);
printf("\n20x10+0+0 600x30+0+10 590x10+10+40 250x150+350+50 30x150+10+50 590x100+10+200 \n\n");
i = sraRgnGetReverseIterator(region,1,1);
while(sraRgnIteratorNext(i, &rect))
printf("%dx%d+%d+%d ",
rect.x2-rect.x1,rect.y2-rect.y1,
rect.x1,rect.y1);
sraRgnReleaseIterator(i);
printf("\n590x100+10+200 250x150+350+50 30x150+10+50 590x10+10+40 600x30+0+10 20x10+0+0 \n\n");
sraRgnDestroy(region);
sraRgnDestroy(region1);
sraRgnDestroy(region2);
return(0);
}
