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-rw-r--r--libs/cairo-1.16.0/util/show-traps.c1311
1 files changed, 1311 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/util/show-traps.c b/libs/cairo-1.16.0/util/show-traps.c
new file mode 100644
index 0000000..f46c8b0
--- /dev/null
+++ b/libs/cairo-1.16.0/util/show-traps.c
@@ -0,0 +1,1311 @@
+#define _GNU_SOURCE
+#include <gtk/gtk.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <gdk/gdkkeysyms.h>
+#include <math.h>
+
+typedef struct _point {
+ gdouble x, y;
+} point_t;
+typedef struct _box {
+ point_t p1, p2;
+} box_t;
+typedef struct _line {
+ point_t p1, p2;
+} line_t;
+typedef struct _trapezoid {
+ gdouble top, bottom;
+ line_t left, right;
+} trapezoid_t;
+typedef struct _traps {
+ struct _traps *next, *prev;
+ box_t extents;
+ int num_traps;
+ int size;
+ trapezoid_t traps[0];
+} traps_t;
+
+typedef struct _edge {
+ line_t line;
+ gdouble top, bottom;
+ point_t p1, p2;
+ int dir;
+} edge_t;
+typedef struct _edges {
+ struct _edges *next, *prev;
+ box_t extents;
+ int num_edges;
+ int size;
+ edge_t edges[0];
+} edges_t;
+
+typedef struct _TrapView {
+ GtkWidget widget;
+
+ struct _TrapView *group_head;
+ struct _TrapView *group_next;
+ struct _TrapView *group_prev;
+
+ cairo_surface_t *pixmap;
+ int pixmap_width, pixmap_height;
+
+ traps_t *traps_list;
+ traps_t *current_traps;
+
+ edges_t *edges_list;
+ edges_t *current_edges;
+
+ double px, py;
+
+ gint mag_x, mag_y;
+ gint mag_size;
+ gdouble mag_zoom;
+ gboolean in_mag_drag;
+ gint mag_drag_x, mag_drag_y;
+} TrapView;
+
+typedef struct _TrapViewClass {
+ GtkWidgetClass parent_class;
+} TrapViewClass;
+
+G_DEFINE_TYPE (TrapView, trap_view, GTK_TYPE_WIDGET)
+
+static gdouble
+_compute_intersection_x_for_y (const line_t *line,
+ gdouble y)
+{
+ gdouble dx = line->p2.x - line->p1.x;
+ gdouble dy = line->p2.y - line->p1.y;
+ gdouble x;
+
+ if (y == line->p1.y)
+ return line->p1.x;
+ if (y == line->p2.y)
+ return line->p2.x;
+
+ x = line->p1.x;
+ if (dy != 0)
+ x += (y - line->p1.y)*dx/dy;
+ return x;
+}
+
+static void
+_compute_intersection_point (const line_t *line,
+ gdouble y,
+ point_t *p)
+{
+ p->x = _compute_intersection_x_for_y (line, p->y = y);
+}
+
+static cairo_surface_t *
+pixmap_create (TrapView *self, cairo_surface_t *target)
+{
+ cairo_surface_t *surface = cairo_surface_create_similar (target, CAIRO_CONTENT_COLOR,
+ self->widget.allocation.width,
+ self->widget.allocation.height);
+ cairo_t *cr;
+ traps_t *traps;
+ edges_t *edges;
+ gdouble sf_x, sf_y, sf;
+ gdouble mid, dim;
+ gdouble x0, y0;
+ double dash[2] = {8, 8};
+ double dots[2] = {0., 1.};
+ int n;
+ box_t extents;
+ point_t p;
+
+ traps = self->current_traps;
+ if (traps == NULL)
+ return surface;
+ edges = self->current_edges;
+
+ extents = traps->extents;
+ if (edges != NULL) {
+ if (edges->extents.p1.x < extents.p1.x)
+ extents.p1.x = edges->extents.p1.x;
+ if (edges->extents.p1.y < extents.p1.y)
+ extents.p1.y = edges->extents.p1.y;
+ if (edges->extents.p2.x > extents.p2.x)
+ extents.p2.x = edges->extents.p2.x;
+ if (edges->extents.p2.y > extents.p2.y)
+ extents.p2.y = edges->extents.p2.y;
+ }
+
+ mid = (extents.p2.x + extents.p1.x) / 2.;
+ dim = (extents.p2.x - extents.p1.x) / 2. * 1.25;
+ sf_x = self->widget.allocation.width / dim / 2;
+
+ mid = (extents.p2.y + extents.p1.y) / 2.;
+ dim = (extents.p2.y - extents.p1.y) / 2. * 1.25;
+ sf_y = self->widget.allocation.height / dim / 2;
+
+ sf = MIN (sf_x, sf_y);
+
+ mid = (extents.p2.x + extents.p1.x) / 2.;
+ dim = sf_x / sf * (extents.p2.x - extents.p1.x) / 2. * 1.25;
+ x0 = mid - dim;
+ mid = (extents.p2.y + extents.p1.y) / 2.;
+ dim = sf_y / sf * (extents.p2.y - extents.p1.y) / 2. * 1.25;
+ y0 = mid - dim;
+
+ cr = cairo_create (surface);
+ cairo_set_source_rgb (cr, 1, 1, 1);
+ cairo_paint (cr);
+
+ cairo_save (cr);
+ cairo_scale (cr, sf, sf);
+ cairo_translate (cr, -x0, -y0);
+ cairo_set_source_rgba (cr, 0, 1, 0, .2);
+ for (n = 0; n < traps->num_traps; n++) {
+ const trapezoid_t *t = &traps->traps[n];
+
+ _compute_intersection_point (&t->left, t->top, &p);
+ cairo_move_to (cr, p.x, p.y);
+ _compute_intersection_point (&t->right, t->top, &p);
+ cairo_line_to (cr, p.x, p.y);
+ _compute_intersection_point (&t->right, t->bottom, &p);
+ cairo_line_to (cr, p.x, p.y);
+ _compute_intersection_point (&t->left, t->bottom, &p);
+ cairo_line_to (cr, p.x, p.y);
+ cairo_close_path (cr);
+ cairo_fill (cr);
+ }
+ cairo_restore (cr);
+
+ if (edges == NULL) {
+ cairo_save (cr);
+
+ /* top, bottom */
+ cairo_save (cr); {
+ cairo_matrix_t m;
+ cairo_matrix_init_scale (&m, sf, sf);
+ cairo_matrix_translate (&m, -x0, -y0);
+
+ cairo_set_line_width (cr, 1.);
+ cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
+ for (n = 0; n < traps->num_traps; n++) {
+ const trapezoid_t *t = &traps->traps[n];
+
+ _compute_intersection_point (&t->left, t->top, &p);
+ cairo_matrix_transform_point (&m, &p.x, &p.y);
+ cairo_move_to (cr, floor (p.x), floor (p.y) + .5);
+ cairo_set_dash (cr, dash, 2, fmod (floor (p.x), dash[0] + dash[1]));
+
+ _compute_intersection_point (&t->right, t->top, &p);
+ cairo_matrix_transform_point (&m, &p.x, &p.y);
+ cairo_line_to (cr, ceil (p.x), floor (p.y) + .5);
+ cairo_stroke (cr);
+
+ _compute_intersection_point (&t->left, t->bottom, &p);
+ cairo_matrix_transform_point (&m, &p.x, &p.y);
+ cairo_move_to (cr, floor (p.x), floor (p.y) + .5);
+ cairo_set_dash (cr, dash, 2, fmod (floor (p.x), dash[0] + dash[1]));
+
+ _compute_intersection_point (&t->right, t->bottom, &p);
+ cairo_matrix_transform_point (&m, &p.x, &p.y);
+ cairo_line_to (cr, ceil (p.x), floor (p.y) + .5);
+ cairo_stroke (cr);
+ }
+ } cairo_restore (cr);
+
+ /* left extents */
+ cairo_save (cr); {
+ cairo_save (cr); {
+ cairo_scale (cr, sf, sf);
+ cairo_translate (cr, -x0, -y0);
+
+ for (n = 0; n < traps->num_traps; n++) {
+ const trapezoid_t *t = &traps->traps[n];
+ cairo_move_to (cr, t->left.p1.x, t->left.p1.y);
+ cairo_line_to (cr, t->left.p2.x, t->left.p2.y);
+ }
+ } cairo_restore (cr);
+ cairo_set_source_rgb (cr, 1, 0, 0);
+ cairo_set_line_width (cr, 1.);
+ cairo_set_dash (cr, dash, 2, 0.);
+ cairo_stroke (cr);
+ } cairo_restore (cr);
+
+ /* left line */
+ cairo_save (cr); {
+ cairo_save (cr); {
+ cairo_scale (cr, sf, sf);
+ cairo_translate (cr, -x0, -y0);
+
+ for (n = 0; n < traps->num_traps; n++) {
+ const trapezoid_t *t = &traps->traps[n];
+ _compute_intersection_point (&t->left, t->top, &p);
+ cairo_move_to (cr, p.x, p.y);
+ _compute_intersection_point (&t->left, t->bottom, &p);
+ cairo_line_to (cr, p.x, p.y);
+ }
+ } cairo_restore (cr);
+ cairo_set_source_rgb (cr, 1, 0, 0);
+ cairo_stroke (cr);
+ } cairo_restore (cr);
+
+ /* right extents */
+ cairo_save (cr); {
+ cairo_save (cr); {
+ cairo_scale (cr, sf, sf);
+ cairo_translate (cr, -x0, -y0);
+
+ for (n = 0; n < traps->num_traps; n++) {
+ const trapezoid_t *t = &traps->traps[n];
+ cairo_move_to (cr, t->right.p1.x, t->right.p1.y);
+ cairo_line_to (cr, t->right.p2.x, t->right.p2.y);
+ }
+ } cairo_restore (cr);
+ cairo_set_source_rgb (cr, 0, 0, 1);
+ cairo_set_line_width (cr, 1.);
+ cairo_set_dash (cr, dash, 2, 0.);
+ cairo_stroke (cr);
+ } cairo_restore (cr);
+
+ /* right line */
+ cairo_save (cr); {
+ cairo_save (cr); {
+ cairo_scale (cr, sf, sf);
+ cairo_translate (cr, -x0, -y0);
+
+ for (n = 0; n < traps->num_traps; n++) {
+ const trapezoid_t *t = &traps->traps[n];
+ _compute_intersection_point (&t->right, t->top, &p);
+ cairo_move_to (cr, p.x, p.y);
+ _compute_intersection_point (&t->right, t->bottom, &p);
+ cairo_line_to (cr, p.x, p.y);
+ } cairo_restore (cr);
+ cairo_set_source_rgb (cr, 0, 0, 1);
+ cairo_stroke (cr);
+ } cairo_restore (cr);
+ }
+
+ /* end-points */
+ cairo_save (cr); {
+ cairo_save (cr); {
+ cairo_scale (cr, sf, sf);
+ cairo_translate (cr, -x0, -y0);
+
+ for (n = 0; n < traps->num_traps; n++) {
+ const trapezoid_t *t = &traps->traps[n];
+ _compute_intersection_point (&t->left, t->top, &p);
+ cairo_move_to (cr, p.x, p.y);
+ cairo_close_path (cr);
+ _compute_intersection_point (&t->left, t->bottom, &p);
+ cairo_move_to (cr, p.x, p.y);
+ cairo_close_path (cr);
+ _compute_intersection_point (&t->right, t->top, &p);
+ cairo_move_to (cr, p.x, p.y);
+ cairo_close_path (cr);
+ _compute_intersection_point (&t->right, t->bottom, &p);
+ cairo_move_to (cr, p.x, p.y);
+ cairo_close_path (cr);
+ }
+ } cairo_restore (cr);
+ cairo_set_source_rgb (cr, 0, 0, 0);
+ cairo_set_dash (cr, dots, 2, 0.);
+ cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
+ cairo_set_line_width (cr, 4.);
+ cairo_stroke (cr);
+ } cairo_restore (cr);
+
+ cairo_restore (cr);
+ } else {
+ cairo_save (cr);
+
+ for (n = 0; n < edges->num_edges; n++) {
+ const edge_t *e = &edges->edges[n];
+
+ cairo_save (cr); {
+ cairo_scale (cr, sf, sf);
+ cairo_translate (cr, -x0, -y0);
+ cairo_move_to (cr, e->p1.x, e->p1.y);
+ cairo_line_to (cr, e->p2.x, e->p2.y);
+ } cairo_restore (cr);
+
+ if (e->dir < 0) {
+ cairo_set_source_rgb (cr, 0, 0, 1);
+ cairo_set_dash (cr, dash, 2, dash[0]);
+ } else {
+ cairo_set_source_rgb (cr, 1, 0, 0);
+ cairo_set_dash (cr, dash, 2, 0.);
+ }
+
+ cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
+ cairo_set_line_width (cr, 1.);
+ cairo_stroke (cr);
+
+ cairo_save (cr); {
+ cairo_scale (cr, sf, sf);
+ cairo_translate (cr, -x0, -y0);
+ cairo_move_to (cr, e->p1.x, e->p1.y);
+ cairo_close_path (cr);
+ cairo_move_to (cr, e->p2.x, e->p2.y);
+ cairo_close_path (cr);
+ } cairo_restore (cr);
+ cairo_set_source_rgb (cr, 0, 0, 0);
+ cairo_set_dash (cr, dots, 2, 0.);
+ cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
+ cairo_set_line_width (cr, 4.);
+ cairo_stroke (cr);
+ }
+
+ cairo_restore (cr);
+ }
+
+ cairo_destroy (cr);
+ return surface;
+}
+
+static void
+trap_view_draw (TrapView *self, cairo_t *cr)
+{
+ traps_t *traps;
+ edges_t *edges;
+ gdouble sf_x, sf_y, sf;
+ gdouble mid, dim;
+ gdouble x0, y0;
+ double dash[2] = {8, 8};
+ int n;
+ box_t extents;
+ point_t p;
+
+ if (self->pixmap_width != self->widget.allocation.width ||
+ self->pixmap_height != self->widget.allocation.height)
+ {
+ cairo_surface_destroy (self->pixmap);
+ self->pixmap = pixmap_create (self, cairo_get_target (cr));
+ self->pixmap_width = self->widget.allocation.width;
+ self->pixmap_height = self->widget.allocation.height;
+ }
+
+ cairo_save (cr);
+ cairo_set_source_surface (cr, self->pixmap, 0, 0);
+ cairo_paint (cr);
+ cairo_restore (cr);
+
+ traps = self->current_traps;
+ if (traps == NULL)
+ return;
+
+ extents = traps->extents;
+ edges = self->current_edges;
+ if (edges != NULL) {
+ if (edges->extents.p1.x < extents.p1.x)
+ extents.p1.x = edges->extents.p1.x;
+ if (edges->extents.p1.y < extents.p1.y)
+ extents.p1.y = edges->extents.p1.y;
+ if (edges->extents.p2.x > extents.p2.x)
+ extents.p2.x = edges->extents.p2.x;
+ if (edges->extents.p2.y > extents.p2.y)
+ extents.p2.y = edges->extents.p2.y;
+ }
+
+ mid = (extents.p2.x + extents.p1.x) / 2.;
+ dim = (extents.p2.x - extents.p1.x) / 2. * 1.25;
+ sf_x = self->widget.allocation.width / dim / 2;
+
+ mid = (extents.p2.y + extents.p1.y) / 2.;
+ dim = (extents.p2.y - extents.p1.y) / 2. * 1.25;
+ sf_y = self->widget.allocation.height / dim / 2;
+
+ sf = MIN (sf_x, sf_y);
+
+ mid = (extents.p2.x + extents.p1.x) / 2.;
+ dim = sf_x / sf * (extents.p2.x - extents.p1.x) / 2. * 1.25;
+ x0 = mid - dim;
+ mid = (extents.p2.y + extents.p1.y) / 2.;
+ dim = sf_y / sf * (extents.p2.y - extents.p1.y) / 2. * 1.25;
+ y0 = mid - dim;
+
+ cairo_save (cr);
+
+ /* draw a zoom view of the area around the mouse */
+ {
+ double zoom = self->mag_zoom;
+ int size = self->mag_size;
+
+ cairo_save (cr);
+
+ /* bottom right */
+ cairo_rectangle (cr, self->mag_x, self->mag_y, size, size);
+ cairo_stroke_preserve (cr);
+ cairo_set_source_rgb (cr, 1, 1, 1);
+ cairo_fill_preserve (cr);
+ cairo_clip (cr);
+
+ /* compute roi in extents */
+ cairo_translate (cr, self->mag_x + size/2, self->mag_y + size/2);
+
+ cairo_save (cr);
+ cairo_scale (cr, zoom, zoom);
+ cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
+ for (n = 0; n < traps->num_traps; n++) {
+ const trapezoid_t *t = &traps->traps[n];
+
+ _compute_intersection_point (&t->left, t->top, &p);
+ cairo_move_to (cr, p.x, p.y);
+ _compute_intersection_point (&t->right, t->top, &p);
+ cairo_line_to (cr, p.x, p.y);
+ _compute_intersection_point (&t->right, t->bottom, &p);
+ cairo_line_to (cr, p.x, p.y);
+ _compute_intersection_point (&t->left, t->bottom, &p);
+ cairo_line_to (cr, p.x, p.y);
+ cairo_close_path (cr);
+ cairo_set_source_rgba (cr, 0, 1, 0, .2);
+ cairo_fill (cr);
+ }
+ cairo_restore (cr);
+
+ cairo_save (cr); {
+ cairo_matrix_t m;
+ cairo_matrix_init_scale (&m, zoom, zoom);
+ cairo_matrix_translate (&m, -(self->px / sf + x0), -(self->py /sf + y0));
+
+ cairo_set_source_rgb (cr, 0, 0, 0);
+ cairo_set_line_width (cr, 1.);
+ cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
+ for (n = 0; n < traps->num_traps; n++) {
+ const trapezoid_t *t = &traps->traps[n];
+
+ _compute_intersection_point (&t->left, t->top, &p);
+ cairo_matrix_transform_point (&m, &p.x, &p.y);
+ cairo_move_to (cr, floor (p.x), floor (p.y) + .5);
+ cairo_set_dash (cr, dash, 2, fmod (floor (p.x), dash[0] + dash[1]));
+
+ _compute_intersection_point (&t->right, t->top, &p);
+ cairo_matrix_transform_point (&m, &p.x, &p.y);
+ cairo_line_to (cr, ceil (p.x), floor (p.y) + .5);
+ cairo_stroke (cr);
+
+ _compute_intersection_point (&t->left, t->bottom, &p);
+ cairo_matrix_transform_point (&m, &p.x, &p.y);
+ cairo_move_to (cr, floor (p.x), floor (p.y) + .5);
+ cairo_set_dash (cr, dash, 2, fmod (floor (p.x), dash[0] + dash[1]));
+
+ _compute_intersection_point (&t->right, t->bottom, &p);
+ cairo_matrix_transform_point (&m, &p.x, &p.y);
+ cairo_line_to (cr, ceil (p.x), floor (p.y) + .5);
+ cairo_stroke (cr);
+ }
+ } cairo_restore (cr);
+
+ cairo_save (cr); { /* left extents */
+ cairo_save (cr); {
+ cairo_scale (cr, zoom, zoom);
+ cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
+ for (n = 0; n < traps->num_traps; n++) {
+ const trapezoid_t *t = &traps->traps[n];
+ cairo_move_to (cr, t->left.p1.x, t->left.p1.y);
+ cairo_line_to (cr, t->left.p2.x, t->left.p2.y);
+ }
+ } cairo_restore (cr);
+ cairo_set_source_rgb (cr, 1, 0, 0);
+ cairo_set_line_width (cr, .5);
+ cairo_set_dash (cr, dash, 2, 0.);
+ cairo_stroke (cr);
+ } cairo_restore (cr);
+ cairo_save (cr); { /* right extents */
+ cairo_save (cr); {
+ cairo_scale (cr, zoom, zoom);
+ cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
+
+ for (n = 0; n < traps->num_traps; n++) {
+ const trapezoid_t *t = &traps->traps[n];
+ cairo_move_to (cr, t->right.p1.x, t->right.p1.y);
+ cairo_line_to (cr, t->right.p2.x, t->right.p2.y);
+ }
+ } cairo_restore (cr);
+ cairo_set_source_rgb (cr, 0, 0, 1);
+ cairo_set_line_width (cr, .5);
+ cairo_set_dash (cr, dash, 2, 0.);
+ cairo_stroke (cr);
+ } cairo_restore (cr);
+
+ cairo_save (cr); { /* left lines */
+ cairo_save (cr);
+ cairo_scale (cr, zoom, zoom);
+ cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
+ for (n = 0; n < traps->num_traps; n++) {
+ const trapezoid_t *t = &traps->traps[n];
+ _compute_intersection_point (&t->left, t->top, &p);
+ cairo_move_to (cr, p.x, p.y);
+ _compute_intersection_point (&t->left, t->bottom, &p);
+ cairo_line_to (cr, p.x, p.y);
+ }
+ cairo_restore (cr);
+ cairo_set_source_rgb (cr, 1, 0, 0);
+ cairo_stroke (cr);
+ } cairo_restore (cr);
+ cairo_save (cr); { /* right lines */
+ cairo_save (cr);
+ cairo_scale (cr, zoom, zoom);
+ cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
+ for (n = 0; n < traps->num_traps; n++) {
+ const trapezoid_t *t = &traps->traps[n];
+ _compute_intersection_point (&t->right, t->top, &p);
+ cairo_move_to (cr, p.x, p.y);
+ _compute_intersection_point (&t->right, t->bottom, &p);
+ cairo_line_to (cr, p.x, p.y);
+ }
+ cairo_restore (cr);
+ cairo_set_source_rgb (cr, 0, 0, 1);
+ cairo_stroke (cr);
+ } cairo_restore (cr);
+
+ /* end-points */
+ cairo_save (cr); {
+ double dots[2] = {0., 1.};
+
+ cairo_save (cr);
+ cairo_scale (cr, zoom, zoom);
+ cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
+ for (n = 0; n < traps->num_traps; n++) {
+ const trapezoid_t *t = &traps->traps[n];
+ _compute_intersection_point (&t->left, t->top, &p);
+ cairo_move_to (cr, p.x, p.y);
+ cairo_close_path (cr);
+ _compute_intersection_point (&t->left, t->bottom, &p);
+ cairo_move_to (cr, p.x, p.y);
+ cairo_close_path (cr);
+ _compute_intersection_point (&t->right, t->top, &p);
+ cairo_move_to (cr, p.x, p.y);
+ cairo_close_path (cr);
+ _compute_intersection_point (&t->right, t->bottom, &p);
+ cairo_move_to (cr, p.x, p.y);
+ cairo_close_path (cr);
+ }
+ cairo_restore (cr);
+ cairo_set_source_rgb (cr, 0, 0, 0);
+ cairo_set_dash (cr, dots, 2, 0.);
+ cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
+ cairo_set_line_width (cr, 4.);
+ cairo_stroke (cr);
+ } cairo_restore (cr);
+
+ /* grid */
+ cairo_save (cr); {
+ int i;
+
+ cairo_translate (cr,
+ -zoom*fmod (self->px/sf + x0, 1.),
+ -zoom*fmod (self->py/sf + y0, 1.));
+ for (i = -size/2/zoom - 1; i <= size/2/zoom + 1; i++) {
+ cairo_move_to (cr, zoom*i, -size/2);
+ cairo_line_to (cr, zoom*i, size/2 + zoom);
+ cairo_move_to (cr, -size/2, zoom*i);
+ cairo_line_to (cr, size/2 + zoom, zoom*i);
+ }
+ cairo_set_source_rgba (cr, .7, .7, .7, .5);
+ cairo_set_line_width (cr, 1.);
+ cairo_stroke (cr);
+ } cairo_restore (cr);
+ }
+
+ cairo_restore (cr);
+}
+
+static gdouble
+trapezoid_area (const trapezoid_t *t)
+{
+ gdouble inner_left, inner_right;
+ gdouble outer_left, outer_right;
+ gdouble height;
+ gdouble area;
+
+ /* split into 3 sections: a rectangle with a pair of triangular bookends */
+ inner_left = _compute_intersection_x_for_y (&t->left, t->top);
+ outer_left = _compute_intersection_x_for_y (&t->left, t->bottom);
+ if (outer_left > inner_left) {
+ gdouble t = outer_left;
+ outer_left = inner_left;
+ inner_left = t;
+ }
+
+ inner_right = _compute_intersection_x_for_y (&t->right, t->top);
+ outer_right = _compute_intersection_x_for_y (&t->right, t->bottom);
+ if (outer_right > inner_right) {
+ gdouble t = outer_right;
+ outer_right = inner_right;
+ inner_right = t;
+ }
+
+ if (outer_left > outer_right) { /* reverse */
+ gdouble t;
+
+ t = outer_left;
+ outer_left = inner_right;
+ inner_right = t;
+
+ t = inner_left;
+ inner_left = outer_right;
+ outer_right = t;
+ }
+
+ height = t->bottom - t->top;
+ area = (inner_left - outer_left) * height / 2;
+ area += (outer_right - inner_right) * height / 2;
+ area += (inner_right - inner_left) * height;
+
+ return area;
+}
+
+static gdouble
+traps_compute_total_area (const traps_t *traps)
+{
+ int n;
+ gdouble area = 0.;
+ for (n = 0; n < traps->num_traps; n++)
+ area += trapezoid_area (&traps->traps[n]);
+ return area;
+}
+
+static void
+trap_view_draw_labels (TrapView *self, cairo_t *cr)
+{
+ PangoLayout *layout;
+ gint width, height;
+ gdouble total_area;
+ gchar *str;
+ traps_t *traps;
+
+ traps = self->current_traps;
+ if (traps == NULL)
+ return;
+
+ /* 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);
+ 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);
+ pango_cairo_show_layout (cr, layout);
+ g_object_unref (layout);
+}
+
+static gboolean
+trap_view_expose (GtkWidget *w, GdkEventExpose *ev)
+{
+ TrapView *self = (TrapView *) w;
+ cairo_t *cr;
+
+ cr = gdk_cairo_create (w->window);
+ gdk_cairo_region (cr, ev->region);
+ cairo_clip (cr);
+
+ trap_view_draw (self, cr);
+ trap_view_draw_labels (self, cr);
+
+ cairo_destroy (cr);
+ return FALSE;
+}
+
+static void
+trap_view_advance (TrapView *self)
+{
+ if (self->current_traps && self->current_traps->prev)
+ self->current_traps = self->current_traps->prev;
+ if (self->current_edges && self->current_edges->prev)
+ self->current_edges = self->current_edges->prev;
+ self->pixmap_width = self->pixmap_height = 0;
+ gtk_widget_queue_draw (&self->widget);
+}
+
+static void
+trap_view_back (TrapView *self)
+{
+ if (self->current_traps && self->current_traps->next)
+ self->current_traps = self->current_traps->next;
+ if (self->current_edges && self->current_edges->next)
+ self->current_edges = self->current_edges->next;
+ self->pixmap_width = self->pixmap_height = 0;
+ gtk_widget_queue_draw (&self->widget);
+}
+
+static void
+trap_view_group_foreach (TrapView *group, GFunc func, gpointer data)
+{
+ while (group) {
+ func (group, data);
+ group = group->group_next;
+ }
+}
+
+static gboolean
+trap_view_key_press (GtkWidget *w, GdkEventKey *ev)
+{
+ TrapView *self = (TrapView *) w;
+
+ switch (ev->keyval) {
+ case GDK_BackSpace:
+ trap_view_group_foreach (self->group_head,
+ (GFunc) trap_view_back,
+ NULL);
+ break;
+
+ case GDK_space:
+ trap_view_group_foreach (self->group_head,
+ (GFunc) trap_view_advance,
+ NULL);
+ break;
+
+ case GDK_Return:
+ trap_view_group_foreach (self->group_head,
+ (GFunc) trap_view_advance,
+ NULL);
+ break;
+
+ case GDK_Escape:
+ case GDK_Q:
+ gtk_main_quit ();
+ break;
+ }
+
+ return FALSE;
+}
+
+static gboolean
+trap_view_button_press (GtkWidget *w, GdkEventButton *ev)
+{
+ TrapView *self = (TrapView *) w;
+
+ if (ev->x < self->mag_x ||
+ ev->y < self->mag_y ||
+ ev->x > self->mag_x + self->mag_size ||
+ ev->y > self->mag_y + self->mag_size)
+ {
+ if (ev->type == GDK_BUTTON_PRESS) {
+ if (self->current_traps == NULL)
+ return FALSE;
+
+ if (ev->button == 1) {
+ trap_view_group_foreach (self->group_head,
+ (GFunc) trap_view_advance,
+ NULL);
+ } else if (ev->button == 3) {
+ trap_view_group_foreach (self->group_head,
+ (GFunc) trap_view_back,
+ NULL);
+ }
+ }
+ }
+ else
+ {
+ self->in_mag_drag = TRUE;
+ self->mag_drag_x = ev->x;
+ self->mag_drag_y = ev->y;
+ }
+
+ return FALSE;
+}
+
+static gboolean
+trap_view_button_release (GtkWidget *w, GdkEventButton *ev)
+{
+ TrapView *self = (TrapView *) w;
+
+ self->in_mag_drag = FALSE;
+
+ return FALSE;
+}
+
+static void
+trap_view_update_mouse (TrapView *self, GdkEventMotion *ev)
+{
+ self->px = ev->x;
+ self->py = ev->y;
+
+ gtk_widget_queue_draw (&self->widget);
+}
+
+static void
+trap_view_update_magnifier (TrapView *self, gint *xy)
+{
+ self->mag_x = xy[0];
+ self->mag_y = xy[1];
+
+ gtk_widget_queue_draw (&self->widget);
+}
+
+static gboolean
+trap_view_motion (GtkWidget *w, GdkEventMotion *ev)
+{
+ TrapView *self = (TrapView *) w;
+
+ if (self->in_mag_drag) {
+ int xy[2];
+
+ xy[0] = self->mag_x + ev->x - self->mag_drag_x;
+ xy[1] = self->mag_y + ev->y - self->mag_drag_y;
+
+ trap_view_group_foreach (self->group_head,
+ (GFunc) trap_view_update_magnifier,
+ xy);
+
+ self->mag_drag_x = ev->x;
+ self->mag_drag_y = ev->y;
+ } else if (ev->x < self->mag_x ||
+ ev->y < self->mag_y ||
+ ev->x > self->mag_x + self->mag_size ||
+ ev->y > self->mag_y + self->mag_size)
+ {
+ trap_view_group_foreach (self->group_head,
+ (GFunc) trap_view_update_mouse,
+ ev);
+ }
+
+ return FALSE;
+}
+
+static void
+trap_view_realize (GtkWidget *widget)
+{
+ GdkWindowAttr attributes;
+
+ GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
+
+ attributes.window_type = GDK_WINDOW_CHILD;
+ attributes.x = widget->allocation.x;
+ attributes.y = widget->allocation.y;
+ attributes.width = widget->allocation.width;
+ attributes.height = widget->allocation.height;
+ attributes.wclass = GDK_INPUT_OUTPUT;
+ attributes.visual = gtk_widget_get_visual (widget);
+ attributes.colormap = gtk_widget_get_colormap (widget);
+ attributes.event_mask = gtk_widget_get_events (widget) |
+ GDK_BUTTON_PRESS_MASK |
+ GDK_BUTTON_RELEASE_MASK |
+ GDK_KEY_PRESS_MASK |
+ GDK_KEY_RELEASE_MASK |
+ GDK_POINTER_MOTION_MASK |
+ GDK_BUTTON_MOTION_MASK |
+ GDK_EXPOSURE_MASK;
+
+ widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
+ &attributes,
+ GDK_WA_X | GDK_WA_Y |
+ GDK_WA_VISUAL | GDK_WA_COLORMAP);
+ gdk_window_set_user_data (widget->window, widget);
+
+ widget->style = gtk_style_attach (widget->style, widget->window);
+ gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
+}
+
+static void
+trap_view_size_allocate (GtkWidget *w, GdkRectangle *r)
+{
+ TrapView *self = (TrapView *) w;
+
+ GTK_WIDGET_CLASS (trap_view_parent_class)->size_allocate (w, r);
+
+ self->mag_x = w->allocation.width - self->mag_size - 10;
+ self->mag_y = w->allocation.height - self->mag_size - 10;
+}
+
+static void
+trap_view_finalize (GObject *obj)
+{
+ G_OBJECT_CLASS (trap_view_parent_class)->finalize (obj);
+}
+
+static void
+trap_view_class_init (TrapViewClass *klass)
+{
+ GObjectClass *object_class = (GObjectClass *) klass;
+ GtkWidgetClass *widget_class = (GtkWidgetClass *) klass;
+
+ object_class->finalize = trap_view_finalize;
+
+ widget_class->realize = trap_view_realize;
+ widget_class->size_allocate = trap_view_size_allocate;
+ widget_class->expose_event = trap_view_expose;
+ widget_class->key_press_event = trap_view_key_press;
+ widget_class->button_press_event = trap_view_button_press;
+ widget_class->button_release_event = trap_view_button_release;
+ widget_class->motion_notify_event = trap_view_motion;
+}
+
+static void
+trap_view_init (TrapView *self)
+{
+ self->mag_zoom = 10;
+ self->mag_size = 200;
+
+ GTK_WIDGET_SET_FLAGS (self, GTK_CAN_FOCUS);
+}
+
+static traps_t *
+_traps_add_trapezoid (TrapView *tv, traps_t *traps, const trapezoid_t *trap)
+{
+ if (trap->top < traps->extents.p1.y)
+ traps->extents.p1.y = trap->top;
+ if (trap->bottom > traps->extents.p2.y)
+ traps->extents.p2.y = trap->bottom;
+
+ if (trap->left.p1.x < traps->extents.p1.x)
+ traps->extents.p1.x = trap->left.p1.x;
+ if (trap->left.p2.x < traps->extents.p1.x)
+ traps->extents.p1.x = trap->left.p2.x;
+
+ if (trap->right.p1.x > traps->extents.p2.x)
+ traps->extents.p2.x = trap->right.p1.x;
+ if (trap->right.p2.x > traps->extents.p2.x)
+ traps->extents.p2.x = trap->right.p2.x;
+
+ if (traps->num_traps == traps->size) {
+ int newsize = 2 * traps->size;
+ void *newtraps;
+
+ newtraps = g_realloc (traps,
+ sizeof (traps_t) + newsize * sizeof (trapezoid_t));
+ if (newtraps == NULL)
+ return traps;
+
+ if (tv->current_traps == traps)
+ tv->current_traps = newtraps;
+
+ traps = newtraps;
+ traps->size = newsize;
+
+ if (traps->next != NULL)
+ traps->next->prev = newtraps;
+ if (traps->prev != NULL)
+ traps->prev->next = newtraps;
+ else
+ tv->traps_list = newtraps;
+ }
+
+ traps->traps[traps->num_traps++] = *trap;
+
+ return traps;
+}
+
+static traps_t *
+traps_new (TrapView *tv)
+{
+ traps_t *t;
+
+ t = g_malloc (sizeof (traps_t) + 16 * sizeof (trapezoid_t));
+ t->prev = NULL;
+ t->next = tv->traps_list;
+ if (tv->traps_list)
+ tv->traps_list->prev = t;
+ tv->traps_list = t;
+
+ if (tv->current_traps == NULL)
+ tv->current_traps = t;
+
+ t->size = 16;
+ t->num_traps = 0;
+ t->extents.p1.x = G_MAXDOUBLE;
+ t->extents.p1.y = G_MAXDOUBLE;
+ t->extents.p2.x = -G_MAXDOUBLE;
+ t->extents.p2.y = -G_MAXDOUBLE;
+
+ return t;
+}
+
+static edges_t *
+_edges_add_edge (TrapView *tv, edges_t *edges, edge_t *e)
+{
+ if (e->top < edges->extents.p1.y)
+ edges->extents.p1.y = e->top;
+ if (e->bottom > edges->extents.p2.y)
+ edges->extents.p2.y = e->bottom;
+
+ _compute_intersection_point (&e->line, e->top, &e->p1);
+ _compute_intersection_point (&e->line, e->bottom, &e->p2);
+
+ if (e->p1.x < edges->extents.p1.x)
+ edges->extents.p1.x = e->p1.x;
+ if (e->p2.x < edges->extents.p1.x)
+ edges->extents.p1.x = e->p2.x;
+
+ if (e->p1.x > edges->extents.p2.x)
+ edges->extents.p2.x = e->p1.x;
+ if (e->p2.x > edges->extents.p2.x)
+ edges->extents.p2.x = e->p2.x;
+
+ if (edges->num_edges == edges->size) {
+ int newsize = 2 * edges->size;
+ void *newedges;
+
+ newedges = g_realloc (edges,
+ sizeof (edges_t) + newsize * sizeof (edge_t));
+ if (newedges == NULL)
+ return edges;
+
+ if (tv->current_edges == edges)
+ tv->current_edges = newedges;
+
+ edges = newedges;
+ edges->size = newsize;
+
+ if (edges->next != NULL)
+ edges->next->prev = newedges;
+ if (edges->prev != NULL)
+ edges->prev->next = newedges;
+ else
+ tv->edges_list = newedges;
+ }
+
+ edges->edges[edges->num_edges++] = *e;
+
+ return edges;
+}
+
+static edges_t *
+edges_new (TrapView *tv)
+{
+ edges_t *t;
+
+ t = g_malloc (sizeof (edges_t) + 16 * sizeof (edge_t));
+ t->prev = NULL;
+ t->next = tv->edges_list;
+ if (tv->edges_list)
+ tv->edges_list->prev = t;
+ tv->edges_list = t;
+
+ if (tv->current_edges == NULL)
+ tv->current_edges = t;
+
+ t->size = 16;
+ t->num_edges = 0;
+ t->extents.p1.x = G_MAXDOUBLE;
+ t->extents.p1.y = G_MAXDOUBLE;
+ t->extents.p2.x = -G_MAXDOUBLE;
+ t->extents.p2.y = -G_MAXDOUBLE;
+
+ return t;
+}
+
+int
+main (int argc, char **argv)
+{
+ TrapView *tv, *group_head = NULL, *group_prev = NULL;
+ GtkWidget *window, *hbox;
+ FILE *file;
+
+ gtk_init (&argc, &argv);
+
+ hbox = gtk_hbox_new (TRUE, 0);
+
+ file = fopen (argv[1], "r");
+ if (file != NULL) {
+ char *line = NULL;
+ size_t len = 0;
+ traps_t *traps;
+
+ tv = g_object_new (trap_view_get_type (), NULL);
+ gtk_box_pack_start (GTK_BOX (hbox), &tv->widget, TRUE, TRUE, 0);
+ gtk_widget_show (&tv->widget);
+
+ tv->group_prev = group_prev;
+ tv->group_next = NULL;
+ if (group_prev)
+ group_prev->group_next = tv;
+ group_prev = tv;
+ if (group_head == NULL)
+ group_head = tv;
+ tv->group_head = group_head;
+
+ traps = traps_new (tv);
+ while (getline (&line, &len, file) != -1) {
+ trapezoid_t t;
+
+ if (sscanf (line,
+ "%lf %lf L:(%lf, %lf), (%lf, %lf) R:(%lf, %lf), (%lf, %lf)",
+ &t.top, &t.bottom,
+ &t.left.p1.x, &t.left.p1.y,
+ &t.left.p2.x, &t.left.p2.y,
+ &t.right.p1.x, &t.right.p1.y,
+ &t.right.p2.x, &t.right.p2.y) == 10) {
+ traps = _traps_add_trapezoid (tv, traps, &t);
+ } else {
+ if (traps->num_traps) {
+ g_print ("read %d trapezoids\n", traps->num_traps);
+ g_print ("extents=(%lg, %lg), (%lg, %lg)\n",
+ traps->extents.p1.x, traps->extents.p1.y,
+ traps->extents.p2.x, traps->extents.p2.y);
+ traps = traps_new (tv);
+ }
+ }
+ }
+ free (line);
+ fclose (file);
+
+ if (traps->num_traps) {
+ g_print ("read %d trapezoids\n", traps->num_traps);
+ g_print ("extents=(%lg, %lg), (%lg, %lg)\n",
+ traps->extents.p1.x, traps->extents.p1.y,
+ traps->extents.p2.x, traps->extents.p2.y);
+ }
+ }
+
+ file = fopen (argv[2], "r");
+ if (file != NULL) {
+ char *line = NULL;
+ size_t len = 0;
+ traps_t *traps;
+
+ tv = g_object_new (trap_view_get_type (), NULL);
+ gtk_box_pack_start (GTK_BOX (hbox), &tv->widget, TRUE, TRUE, 0);
+ gtk_widget_show (&tv->widget);
+
+ tv->group_prev = group_prev;
+ tv->group_next = NULL;
+ if (group_prev)
+ group_prev->group_next = tv;
+ group_prev = tv;
+ if (group_head == NULL)
+ group_head = tv;
+ tv->group_head = group_head;
+
+ traps = traps_new (tv);
+ while (getline (&line, &len, file) != -1) {
+ trapezoid_t t;
+
+ if (sscanf (line,
+ "%lf %lf L:(%lf, %lf), (%lf, %lf) R:(%lf, %lf), (%lf, %lf)",
+ &t.top, &t.bottom,
+ &t.left.p1.x, &t.left.p1.y,
+ &t.left.p2.x, &t.left.p2.y,
+ &t.right.p1.x, &t.right.p1.y,
+ &t.right.p2.x, &t.right.p2.y) == 10) {
+ traps = _traps_add_trapezoid (tv, traps, &t);
+ } else {
+ if (traps->num_traps) {
+ g_print ("read %d trapezoids\n", traps->num_traps);
+ g_print ("extents=(%lg, %lg), (%lg, %lg)\n",
+ traps->extents.p1.x, traps->extents.p1.y,
+ traps->extents.p2.x, traps->extents.p2.y);
+ traps = traps_new (tv);
+ }
+ }
+ }
+ free (line);
+ fclose (file);
+
+ if (traps->num_traps) {
+ g_print ("read %d trapezoids\n", traps->num_traps);
+ g_print ("extents=(%lg, %lg), (%lg, %lg)\n",
+ traps->extents.p1.x, traps->extents.p1.y,
+ traps->extents.p2.x, traps->extents.p2.y);
+ }
+ }
+
+#if 1
+ if (argc >=4) {
+ file = fopen (argv[3], "r");
+ if (file != NULL) {
+ char *line = NULL;
+ size_t len = 0;
+ edges_t *edges;
+
+ edges = edges_new (tv);
+ while (getline (&line, &len, file) != -1) {
+ edge_t e;
+
+ if (sscanf (line,
+ "(%lf, %lf), (%lf, %lf) %lf %lf %d",
+ &e.line.p1.x, &e.line.p1.y,
+ &e.line.p2.x, &e.line.p2.y,
+ &e.top, &e.bottom,
+ &e.dir) == 7) {
+ edges = _edges_add_edge (tv, edges, &e);
+ } else {
+ if (edges->num_edges) {
+ g_print ("read %d edges\n", edges->num_edges);
+ g_print ("extents=(%lg, %lg), (%lg, %lg)\n",
+ edges->extents.p1.x, edges->extents.p1.y,
+ edges->extents.p2.x, edges->extents.p2.y);
+ edges = edges_new (tv);
+ }
+ }
+ }
+ free (line);
+ fclose (file);
+
+ if (edges->num_edges) {
+ g_print ("read %d edges\n", edges->num_edges);
+ g_print ("extents=(%lg, %lg), (%lg, %lg)\n",
+ edges->extents.p1.x, edges->extents.p1.y,
+ edges->extents.p2.x, edges->extents.p2.y);
+ }
+ }
+ }
+#else
+ if (argc >= 4) {
+ file = fopen (argv[3], "r");
+ if (file != NULL) {
+ char *line = NULL;
+ size_t len = 0;
+ traps_t *traps;
+
+ tv = g_object_new (trap_view_get_type (), NULL);
+ gtk_box_pack_start (GTK_BOX (hbox), &tv->widget, TRUE, TRUE, 0);
+ gtk_widget_show (&tv->widget);
+
+ tv->group_prev = group_prev;
+ tv->group_next = NULL;
+ if (group_prev)
+ group_prev->group_next = tv;
+ group_prev = tv;
+ if (group_head == NULL)
+ group_head = tv;
+ tv->group_head = group_head;
+
+ traps = traps_new (tv);
+ while (getline (&line, &len, file) != -1) {
+ trapezoid_t t;
+
+ if (sscanf (line,
+ "%lf %lf L:(%lf, %lf), (%lf, %lf) R:(%lf, %lf), (%lf, %lf)",
+ &t.top, &t.bottom,
+ &t.left.p1.x, &t.left.p1.y,
+ &t.left.p2.x, &t.left.p2.y,
+ &t.right.p1.x, &t.right.p1.y,
+ &t.right.p2.x, &t.right.p2.y) == 10) {
+ traps = _traps_add_trapezoid (tv, traps, &t);
+ } else {
+ if (traps->num_traps) {
+ g_print ("read %d trapezoids\n", traps->num_traps);
+ g_print ("extents=(%lg, %lg), (%lg, %lg)\n",
+ traps->extents.p1.x, traps->extents.p1.y,
+ traps->extents.p2.x, traps->extents.p2.y);
+ traps = traps_new (tv);
+ }
+ }
+ }
+ free (line);
+ fclose (file);
+
+ if (traps->num_traps) {
+ g_print ("read %d trapezoids\n", traps->num_traps);
+ g_print ("extents=(%lg, %lg), (%lg, %lg)\n",
+ traps->extents.p1.x, traps->extents.p1.y,
+ traps->extents.p2.x, traps->extents.p2.y);
+ }
+ }
+ }
+#endif
+
+ 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_container_add (GTK_CONTAINER (window), hbox);
+ gtk_widget_show (hbox);
+ gtk_widget_show (window);
+
+ gtk_main ();
+ return 0;
+}
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-23 02:10:42 +0000