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cameo/area.c: move handling of left/right from hit_path to hit_segment

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For future extensions.
This commit is contained in:
Werner Almesberger 2012-03-20 19:30:03 -03:00
parent ebcdfd52ca
commit 7a61482a04
1 changed files with 16 additions and 8 deletions
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24
cameo/area.c
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@ -155,9 +155,9 @@ static int touch(double ax, double ay, double bx, double by,
static int hit_segment(double fx, double fy, double tx, double ty, static int hit_segment(double fx, double fy, double tx, double ty,
const struct point *a, const struct point *b, double r, int enter, const struct point *a, const struct point *b, double r, int enter,
double *n) int left, double *n)
{ {
double dx, dy, d; double dx, dy, nx, ny, nn;
double px, py; double px, py;
double na, nb; double na, nb;
@ -167,14 +167,22 @@ static int hit_segment(double fx, double fy, double tx, double ty,
dx = b->x-a->x; dx = b->x-a->x;
dy = b->y-a->y; dy = b->y-a->y;
if (left) {
nx = dx;
ny = dy;
} else {
nx = -dx;
ny = -dy;
}
/* -dy becomes the x component of the normal vector */ /* -dy becomes the x component of the normal vector */
if (enter ? dy < 0 : dy > 0) if (enter ? ny < 0 : ny > 0)
return 0; return 0;
d = hypot(dx, dy); nn = hypot(nx, ny);
px = a->x-dy/d*r; px = a->x-ny/nn*r;
py = a->y+dx/d*r; py = a->y+nx/nn*r;
if (!intersect(fx, fy, tx, ty, px, py, dx, dy, &na, &nb)) if (!intersect(fx, fy, tx, ty, px, py, dx, dy, &na, &nb))
return 0; return 0;
@ -205,8 +213,8 @@ static int hit_path(double fx, double fy, double tx, double ty,
if (inside) if (inside)
left = !left; left = !left;
for (p = path->first; p != path->last; p = p->next) { for (p = path->first; p != path->last; p = p->next) {
if (hit_segment(fx, fy, tx, ty, if (hit_segment(fx, fy, tx, ty, p, p->next,
left ? p : p->next, left ? p->next : p, r, enter, &tmp)) { r, enter, left, &tmp)) {
if (!found || nx > tmp) if (!found || nx > tmp)
nx = tmp; nx = tmp;
found = 1; found = 1;