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util/show-polygon: Show the limited range of each edge

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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-11-01 08:37:58 +00:00
parent 03adea2f50
commit 5844dead01
1 changed files with 48 additions and 4 deletions
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52
util/show-polygon.c
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@ -55,17 +55,35 @@ static void draw_edges (cairo_t *cr, polygon_t *p, gdouble sf, int dir)
{
int n;
if (dir < 0)
cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);
else
cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
for (n = 0; n < p->num_edges; n++) {
const edge_t *e = &p->edges[n];
double dx, dy;
double x1, x2;
if (e->dir != dir)
continue;
cairo_arc (cr, e->p1.x, e->p1.y, 2/sf, 0, 2*M_PI);
cairo_arc (cr, e->p2.x, e->p2.y, 2/sf, 0, 2*M_PI);
dx = e->p2.x - e->p1.x;
dy = e->p2.y - e->p1.y;
x1 = e->p1.x + (e->top - e->p1.y) / dy * dx;
x2 = e->p1.x + (e->bot - e->p1.y) / dy * dx;
cairo_arc (cr, x1, e->top, 2/sf, 0, 2*M_PI);
cairo_arc (cr, x2, e->bot, 2/sf, 0, 2*M_PI);
cairo_fill (cr);
}
if (dir < 0)
cairo_set_source_rgba (cr, 0.0, 0.0, 1.0, 0.5);
else
cairo_set_source_rgba (cr, 1.0, 0.0, 0.0, 0.5);
for (n = 0; n < p->num_edges; n++) {
const edge_t *e = &p->edges[n];
@ -80,14 +98,40 @@ static void draw_edges (cairo_t *cr, polygon_t *p, gdouble sf, int dir)
cairo_set_line_width (cr, 1.);
cairo_stroke (cr);
} cairo_restore (cr);
if (dir < 0)
cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);
else
cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
for (n = 0; n < p->num_edges; n++) {
const edge_t *e = &p->edges[n];
double dx, dy;
double x1, x2;
if (e->dir != dir)
continue;
dx = e->p2.x - e->p1.x;
dy = e->p2.y - e->p1.y;
x1 = e->p1.x + (e->top - e->p1.y) / dy * dx;
x2 = e->p1.x + (e->bot - e->p1.y) / dy * dx;
cairo_move_to (cr, x1, e->top);
cairo_line_to (cr, x2, e->bot);
}
cairo_save (cr); {
cairo_identity_matrix (cr);
cairo_set_line_width (cr, 1.);
cairo_stroke (cr);
} cairo_restore (cr);
}
static void draw_polygon (cairo_t *cr, polygon_t *p, gdouble sf)
{
cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);
draw_edges (cr, p, sf, -1);
cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
draw_edges (cr, p, sf, +1);
}