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[util] Show total edge length in show-edges

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This commit is contained in:
Chris Wilson 2009-08-04 13:14:38 +01:00
parent 0f8af05484
commit dc886450ac
1 changed files with 43 additions and 11 deletions
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54
util/show-edges.c
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@ -586,6 +586,23 @@ trap_view_draw (TrapView *self, cairo_t *cr)
cairo_restore (cr);
}
static gdouble
edge_length (const edge_t *e)
{
return hypot (e->p2.x - e->p1.x, e->p2.y - e->p1.y);
}
static gdouble
edges_compute_total_length (const edges_t *edges)
{
int n;
gdouble len = 0.;
for (n = 0; n < edges->num_edges; n++)
len += edge_length (&edges->edges[n]);
return len;
}
static gdouble
trapezoid_area (const trapezoid_t *t)
{
@ -646,26 +663,41 @@ trap_view_draw_labels (TrapView *self, cairo_t *cr)
{
PangoLayout *layout;
gint width, height;
gdouble total_area;
GString *string;
gchar *str;
traps_t *traps;
edges_t *edges;
string = g_string_new (NULL);
traps = self->current_traps;
if (traps == NULL)
return;
if (traps != NULL) {
/* convert total area from fixed-point (assuming 24.8) */
gdouble total_area = traps_compute_total_area (traps) / (256. * 256.);
g_string_append_printf (string,
"Number of trapezoids:\t%d\n"
"Total area of trapezoids:\t%.2f\n",
traps->num_traps,
total_area);
}
/* convert total area from fixed-point (assuming 24.8) */
total_area = traps_compute_total_area (traps) / (256. * 256.);
str = g_strdup_printf ("Number of trapezoids:\t%d\n"
"Total area of trapezoids:\t%.2f",
traps->num_traps,
total_area);
edges = self->current_edges;
if (edges != NULL) {
double total_length = edges_compute_total_length (edges) / 256.;
g_string_append_printf (string,
"Number of edges:\t%d\n"
"Total length of edges: \t%.2f\n",
edges->num_edges,
total_length);
}
str = g_string_free (string, FALSE);
layout = gtk_widget_create_pango_layout (&self->widget, str);
g_free (str);
pango_layout_get_pixel_size (layout, &width, &height);
cairo_move_to (cr, 10, 10 + height);
cairo_move_to (cr, 10, 40);
pango_cairo_show_layout (cr, layout);
g_object_unref (layout);
}
@ -1179,7 +1211,7 @@ main (int argc, char **argv)
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
g_signal_connect (window, "delete-event",
G_CALLBACK (gtk_main_quit), NULL);
gtk_widget_set_size_request (window, 512, 512);
gtk_widget_set_size_request (window, 800, 800);
gtk_container_add (GTK_CONTAINER (window), hbox);
gtk_widget_show (hbox);
gtk_widget_show (window);