blob: f3fa1babf4e4574df4544bafa38574280cff4e5b [file] [log] [blame]
#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 _contour {
struct _contour *next, *prev;
int direction;
int num_points;
int size;
point_t points[0];
} contour_t;
typedef struct _TrapView {
GtkWidget widget;
cairo_surface_t *pixmap;
int pixmap_width, pixmap_height;
box_t extents;
contour_t *contours;
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 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 = cairo_create (surface);
contour_t *contour;
gdouble sf_x, sf_y, sf;
gdouble mid, dim;
gdouble x0, y0;
int n;
box_t extents;
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
if (self->contours == NULL) {
cairo_destroy(cr);
return surface;
}
extents = self->extents;
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;
for (contour = self->contours; contour; contour = contour->next) {
if (contour->num_points == 0)
continue;
cairo_save (cr); {
cairo_scale (cr, sf, sf);
cairo_translate (cr, -x0, -y0);
switch (contour->direction) {
case -1:
cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);
break;
case 0:
cairo_set_source_rgb (cr, 0.0, 1.0, 0.0);
break;
case 1:
cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
break;
}
{
const point_t *p = &contour->points[0];
cairo_arc (cr, p->x, p->y, 4/sf, 0, 2 * M_PI);
cairo_save (cr);
cairo_identity_matrix (cr);
cairo_stroke (cr);
cairo_restore (cr);
}
for (n = 0; n < contour->num_points; n++) {
const point_t *p = &contour->points[n];
cairo_arc (cr, p->x, p->y, 2/sf, 0, 2 * M_PI);
cairo_fill (cr);
}
for (n = 0; n < contour->num_points; n++) {
const point_t *p = &contour->points[n];
cairo_line_to (cr, p->x, p->y);
}
} cairo_restore (cr);
switch (contour->direction) {
case -1:
cairo_set_source_rgb (cr, 0.3, 0.3, 0.9);
break;
case 0:
cairo_set_source_rgb (cr, 0.3, 0.9, 0.3);
break;
case 1:
cairo_set_source_rgb (cr, 0.9, 0.3, 0.3);
break;
}
cairo_set_line_width (cr, 1.);
cairo_stroke (cr);
}
cairo_destroy (cr);
return surface;
}
static void
trap_view_draw (TrapView *self, cairo_t *cr)
{
contour_t *contour;
gdouble sf_x, sf_y, sf;
gdouble mid, dim;
gdouble x0, y0;
int n;
box_t extents;
extents = self->extents;
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;
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_set_source_surface (cr, self->pixmap, 0, 0);
cairo_paint (cr);
if (self->contours == NULL)
return;
/* draw a zoom view of the area around the mouse */
if (1) {
double zoom = self->mag_zoom;
int size = self->mag_size;
int mag_x = self->mag_x;
int mag_y = self->mag_y;
if (1) {
if (self->px + size < self->widget.allocation.width/2)
mag_x = self->px + size/4;
else
mag_x = self->px - size/4 - size;
mag_y = self->py - size/2;
if (mag_y < 0)
mag_y = 0;
if (mag_y + size > self->widget.allocation.height)
mag_y = self->widget.allocation.height - size;
}
cairo_save (cr); {
/* bottom right */
cairo_rectangle (cr, mag_x, 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, mag_x + size/2, mag_y + size/2);
cairo_save (cr); {
for (contour = self->contours; contour; contour = contour->next) {
if (contour->num_points == 0)
continue;
cairo_save (cr); {
cairo_scale (cr, zoom, zoom);
cairo_translate (cr, -(self->px / sf + x0), -(self->py /sf + y0));
switch (contour->direction) {
case -1:
cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);
break;
case 0:
cairo_set_source_rgb (cr, 0.0, 1.0, 0.0);
break;
case 1:
cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
break;
}
{
const point_t *p = &contour->points[0];
cairo_arc (cr, p->x, p->y, 4/zoom, 0, 2 * M_PI);
cairo_save (cr);
cairo_identity_matrix (cr);
cairo_stroke (cr);
cairo_restore (cr);
}
for (n = 0; n < contour->num_points; n++) {
const point_t *p = &contour->points[n];
cairo_arc (cr, p->x, p->y, 2/zoom, 0, 2 * M_PI);
cairo_fill (cr);
}
for (n = 0; n < contour->num_points; n++) {
const point_t *p = &contour->points[n];
cairo_line_to (cr, p->x, p->y);
}
} cairo_restore (cr);
switch (contour->direction) {
case -1:
cairo_set_source_rgb (cr, 0.3, 0.3, 0.9);
break;
case 0:
cairo_set_source_rgb (cr, 0.3, 0.9, 0.3);
break;
case 1:
cairo_set_source_rgb (cr, 0.9, 0.3, 0.3);
break;
}
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.));
zoom /= 2;
for (i = -size/2/zoom; i <= size/2/zoom + 1; i+=2) {
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);
}
zoom *= 2;
cairo_set_source_rgba (cr, .7, .7, .7, .5);
cairo_set_line_width (cr, 1.);
cairo_stroke (cr);
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, .1, .1, .1, .5);
cairo_set_line_width (cr, 2.);
cairo_stroke (cr);
} cairo_restore (cr);
} cairo_restore (cr);
}
}
static gdouble
edge_length (const point_t *p1, const point_t *p2)
{
return hypot (p2->x - p1->x, p2->y - p1->y);
}
static gdouble
contour_compute_total_length (const contour_t *contour)
{
int n;
gdouble len = 0.;
for (n = 1; n < contour->num_points; n++)
len += edge_length (&contour->points[n-1], &contour->points[n]);
return len;
}
static void
trap_view_draw_labels (TrapView *self, cairo_t *cr)
{
contour_t *contour;
int y = 12;
for (contour = self->contours; contour; contour = contour->next) {
double total_length = contour_compute_total_length (contour) / 256.;
PangoLayout *layout;
gint width, height;
GString *string;
gchar *str;
if (contour->num_points == 0)
continue;
string = g_string_new (NULL);
g_string_append_printf (string,
"Number of points:\t%d\n"
"Total length of contour: \t%.2f",
contour->num_points,
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);
switch (contour->direction) {
case -1:
cairo_set_source_rgb (cr, 0.9, 0.3, 0.3);
break;
case 0:
cairo_set_source_rgb (cr, 0.3, 0.9, 0.3);
break;
case 1:
cairo_set_source_rgb (cr, 0.3, 0.3, 0.9);
break;
}
cairo_move_to (cr, 10, y);
pango_cairo_show_layout (cr, layout);
g_object_unref (layout);
y += height + 4;
}
}
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 gboolean
trap_view_key_press (GtkWidget *w, GdkEventKey *ev)
{
switch (ev->keyval) {
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)
{
}
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_update_magnifier (self, 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_update_mouse (self, 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 = 64;
self->mag_size = 200;
self->extents.p1.x = G_MAXDOUBLE;
self->extents.p1.y = G_MAXDOUBLE;
self->extents.p2.x = -G_MAXDOUBLE;
self->extents.p2.y = -G_MAXDOUBLE;
GTK_WIDGET_SET_FLAGS (self, GTK_CAN_FOCUS);
}
static contour_t *
_contour_add_point (TrapView *tv, contour_t *contour, point_t *p)
{
if (contour == NULL)
return NULL;
if (p->y < tv->extents.p1.y)
tv->extents.p1.y = p->y;
if (p->y > tv->extents.p2.y)
tv->extents.p2.y = p->y;
if (p->x < tv->extents.p1.x)
tv->extents.p1.x = p->x;
if (p->x > tv->extents.p2.x)
tv->extents.p2.x = p->x;
if (contour->num_points == contour->size) {
int newsize = 2 * contour->size;
void *newcontour;
newcontour = g_realloc (contour,
sizeof (contour_t) + newsize * sizeof (point_t));
if (newcontour == NULL)
return contour;
contour = newcontour;
contour->size = newsize;
if (contour->next != NULL)
contour->next->prev = newcontour;
if (contour->prev != NULL)
contour->prev->next = newcontour;
else
tv->contours = newcontour;
}
contour->points[contour->num_points++] = *p;
return contour;
}
static contour_t *
contour_new (TrapView *tv, int direction)
{
contour_t *t;
t = g_malloc (sizeof (contour_t) + 128 * sizeof (point_t));
t->direction = direction;
t->prev = NULL;
t->next = tv->contours;
if (tv->contours)
tv->contours->prev = t;
tv->contours = t;
t->size = 128;
t->num_points = 0;
return t;
}
int
main (int argc, char **argv)
{
TrapView *tv;
contour_t *contour = NULL;
GtkWidget *window;
FILE *file;
char *line = NULL;
size_t len = 0;
gtk_init (&argc, &argv);
tv = g_object_new (trap_view_get_type (), NULL);
file = fopen (argv[1], "r");
if (file != NULL) {
while (getline (&line, &len, file) != -1) {
point_t p;
int direction;
if (sscanf (line, "contour: direction=%d", &direction)) {
if (contour)
g_print ("read %d contour\n", contour->num_points);
contour = contour_new (tv, direction);
} else if (sscanf (line, " [%*d] = (%lf, %lf)", &p.x, &p.y) == 2) {
contour = _contour_add_point (tv, contour, &p);
}
}
if (contour)
g_print ("read %d contour\n", contour->num_points);
g_print ("extents=(%lg, %lg), (%lg, %lg)\n",
tv->extents.p1.x, tv->extents.p1.y,
tv->extents.p2.x, tv->extents.p2.y);
fclose (file);
}
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, 800, 800);
gtk_container_add (GTK_CONTAINER (window), &tv->widget);
gtk_widget_show_all (window);
gtk_main ();
return 0;
}