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Clip large LineString features down to the bounds of the tile

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Eric Fischer
2014-09-26 17:07:52 -07:00
parent 2d34916fca
commit 120809b004
3 changed files with 66 additions and 2 deletions
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clip.c
+8 -1
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@@ -28,6 +28,7 @@ int clip(double *x0, double *y0, double *x1, double *y1, double xmin, double ymi
int outcode0 = computeOutCode(*x0, *y0, xmin, ymin, xmax, ymax);
int outcode1 = computeOutCode(*x1, *y1, xmin, ymin, xmax, ymax);
int accept = 0;
int changed = 0;
while (1) {
if (!(outcode0 | outcode1)) { // Bitwise OR is 0. Trivially accept and get out of loop
@@ -65,13 +66,19 @@ int clip(double *x0, double *y0, double *x1, double *y1, double xmin, double ymi
*x0 = x;
*y0 = y;
outcode0 = computeOutCode(*x0, *y0, xmin, ymin, xmax, ymax);
changed = 1;
} else {
*x1 = x;
*y1 = y;
outcode1 = computeOutCode(*x1, *y1, xmin, ymin, xmax, ymax);
changed = 1;
}
}
}
return accept;
if (accept == 0) {
return 0;
} else {
return changed + 1;
}
}