/* -*- mode: c; c-basic-offset: 2 -*-
- * To compile:
- *
- * gcc -Wall -g $(pkg-config --cflags --libs gtk+-2.0 cairo) \
- * akamaru.c -o akamaru
- *
* See:
*
* http://en.wikipedia.org/wiki/Verlet_integration
* corrections at the end instead of meaning as it goes.
*/
-#include <gtk/gtk.h>
-#include <cairo.h>
-#include <cairo-xlib.h>
-#include <gdk/gdkx.h>
+#include <glib.h>
#include <stdlib.h>
#include <string.h>
-#include <sys/time.h>
+#include <stdarg.h>
#include <math.h>
-const double ground_level = 500;
+#include "akamaru.h"
+
const double elasticity = 0.7;
+const double friction = 8;
+const double gravity = 50;
-typedef struct _xy_pair Point;
-typedef struct _xy_pair Vector;
-struct _xy_pair {
- double x, y;
-};
-
-typedef struct _Object Object;
-typedef struct _Stick Stick;
-typedef struct _String String;
-typedef struct _Polygon Polygon;
-typedef struct _Offset Offset;
-typedef struct _Model Model;
-
-struct _Object {
- Vector force;
-
- Point position;
- Point previous_position;
- Vector velocity;
-
- double mass;
- double theta;
-};
-
-struct _Stick {
- Object *a, *b;
- int length;
-};
-
-struct _String {
- Object *a, *b;
- int length;
-};
-
-struct _Offset {
- int num_objects;
- Object **objects;
- int dx, dy;
-};
-
-struct _Polygon {
- int num_points;
- Point *points;
- Vector *normals;
- int edge;
-};
-
-struct _Model {
- int num_objects;
- Object *objects;
- int num_sticks;
- Stick *sticks;
- int num_strings;
- String *strings;
- int num_offsets;
- Offset *offsets;
- int num_polygons;
- Polygon *polygons;
- double k;
- double friction;
-
- Object *anchor_object;
- Vector anchor_position;
-
- double theta;
-};
+void
+object_init (Object *object, double x, double y, double mass)
+{
+ object->position.x = x;
+ object->position.y = y;
+ object->previous_position.x = x;
+ object->previous_position.y = y;
+ object->mass = mass;
+}
-static void
-polygon_init (Polygon *p, int num_points, ...)
+void
+spring_init (Spring *spring, Object *a, Object *b, double length)
+{
+ spring->a = a;
+ spring->b = b;
+ spring->length = length;
+}
+
+void
+stick_init (Stick *stick, Object *a, Object *b, double length)
+{
+ stick->a = a;
+ stick->b = b;
+ stick->length = length;
+}
+
+void
+string_init (String *string, Object *a, Object *b, double length)
+{
+ string->a = a;
+ string->b = b;
+ string->length = length;
+}
+
+void
+offset_spring_init (OffsetSpring *spring, Object *a, Object *b,
+ double dx, double dy)
+{
+ spring->a = a;
+ spring->b = b;
+ spring->dx = dx;
+ spring->dy = dy;
+}
+
+void
+spacer_init (Spacer *spacer, Object *a, Object *b, double length)
+{
+ spacer->a = a;
+ spacer->b = b;
+ spacer->length = length;
+}
+
+void
+anchor_init (Anchor *anchor, Object *object, double x, double y)
+{
+ anchor->object = object;
+ anchor->x = x;
+ anchor->y = y;
+}
+
+void
+polygon_init (Polygon *p, int enclosing, int num_points, ...)
{
double dx, dy, length;
int i, j;
va_start (ap, num_points);
p->num_points = num_points;
p->points = g_new (Point, num_points);
+ p->enclosing = enclosing;
for (i = 0; i < num_points; i++) {
p->points[i].x = va_arg (ap, double);
p->normals = g_new (Vector, p->num_points);
/* Compute outward pointing normals. p->normals[i] is the normal
* for the edged between p->points[i] and p->points[i + 1]. */
- for (i = 0; i < p->num_points; i++) {
+ for (i = 0; i < p->num_points; i++) {
j = (i + 1) % p->num_points;
dx = p->points[j].x - p->points[i].x;
dy = p->points[j].y - p->points[i].y;
}
}
-static void
+void
polygon_init_diamond (Polygon *polygon, double x, double y)
{
- return polygon_init (polygon, 5,
+ return polygon_init (polygon, FALSE, 5,
x, y,
x + 10, y + 40,
x + 90, y + 40,
x + 50, y - 20);
}
-static void
+void
polygon_init_rectangle (Polygon *polygon, double x0, double y0,
double x1, double y1)
{
- return polygon_init (polygon, 4, x0, y0, x0, y1, x1, y1, x1, y0);
+ return polygon_init (polygon, FALSE, 4, x0, y0, x0, y1, x1, y1, x1, y0);
}
-static void
-model_init_polygons (Model *model)
+void
+polygon_init_enclosing_rectangle (Polygon *polygon, double x0, double y0,
+ double x1, double y1)
{
- const int num_polygons = 5;
-
- model->polygons = g_new (Polygon, num_polygons);
- polygon_init_diamond (&model->polygons[0], 250, 300);
- polygon_init_diamond (&model->polygons[1], 400, 150);
- polygon_init_rectangle (&model->polygons[2], -100, 200, 200, 250);
- polygon_init_rectangle (&model->polygons[3], -200, ground_level,
- 1200, ground_level + 400);
-
- polygon_init_rectangle (&model->polygons[4], 300, 320, 400, 350);
-
-
- model->num_polygons = num_polygons;
+ return polygon_init (polygon, TRUE, 4, x0, y0, x0, y1, x1, y1, x1, y0);
}
-static void
-model_init_snake (Model *model)
+void
+model_fini (Model *model)
{
- const int num_objects = 20;
- const int num_sticks = num_objects * 2 - 3;
int i;
- memset (model, 0, sizeof *model);
- model->objects = g_new (Object, num_objects);
- model->num_objects = num_objects;
- model->sticks = g_new (Stick, num_sticks);
- model->num_sticks = num_sticks;
- model_init_polygons (model);
-
- for (i = 0; i < num_objects; i++) {
- model->objects[i].position.x = random() % 200 + 20;
- model->objects[i].position.y = random() % 200 + 20;
- model->objects[i].previous_position.x = random() % 200 + 20;
- model->objects[i].previous_position.y = random() % 200 + 20;
-
- if (i + 1 < num_objects) {
- model->sticks[i * 2].a = &model->objects[i];
- model->sticks[i * 2].b = &model->objects[i + 1];
- model->sticks[i * 2].length = random() % 20 + 20;
- }
- if (i + 2 < num_objects) {
- model->sticks[i * 2 + 1].a = &model->objects[i];
- model->sticks[i * 2 + 1].b = &model->objects[i + 2];
- model->sticks[i * 2 + 1].length = random() % 20 + 20;
- }
- }
+ g_free (model->objects);
+ g_free (model->sticks);
+ g_free (model->strings);
+ for (i = 0; i < model->num_offsets; i++)
+ g_free (model->offsets[i].objects);
+ g_free (model->springs);
+ g_free (model->offset_springs);
+ g_free (model->spacers);
+ for (i = 0; i < model->num_polygons; i++)
+ g_free (model->polygons[i].points);
+ g_free (model->polygons);
- model->anchor_object = NULL;
+ memset (model, 0, sizeof *model);
}
static void
-model_init_rope (Model *model)
+model_accumulate_forces (Model *model)
{
- const int num_objects = 20;
- const int num_sticks = num_objects - 1;
- const int stick_length = 10;
int i;
+ double x, y, dx, dy, distance, displacement;
+ Point middle;
+ Vector u, v;
- memset (model, 0, sizeof *model);
- model->objects = g_new (Object, num_objects);
- model->num_objects = num_objects;
- model->sticks = g_new (Stick, num_sticks);
- model->num_sticks = num_sticks;
- model_init_polygons (model);
-
- for (i = 0; i < num_objects; i++) {
- model->objects[i].position.x = 200;
- model->objects[i].position.y = 40 + i * stick_length;
- model->objects[i].previous_position.x = 200;
- model->objects[i].previous_position.y = 40 + i * stick_length;
-
- if (i + 1 < num_objects) {
- model->sticks[i].a = &model->objects[i];
- model->sticks[i].b = &model->objects[i + 1];
- model->sticks[i].length = stick_length;
- }
- }
-
- model->anchor_object = NULL;
-}
-
-static void
-model_init_curtain (Model *model)
-{
- const int num_ropes = 5;
- const int num_rope_objects = 15;
- const int num_objects = num_ropes * num_rope_objects;
- const int num_sticks = num_ropes * (num_rope_objects - 1);
- const int stick_length = 10;
- const int rope_offset = 30;
- double x, y;
- int i, j, index, stick_index;
+ for (i = 0; i < model->num_objects; i++) {
+ /* Gravity */
+ model->objects[i].force.x = 0;
+ model->objects[i].force.y = gravity * model->objects[i].mass;
- memset (model, 0, sizeof *model);
- model->objects = g_new (Object, num_objects);
- model->num_objects = num_objects;
- model->sticks = g_new (Stick, num_sticks);
- model->num_sticks = num_sticks;
- model->offsets = g_new (Offset, 1);
- model->num_offsets = 1;
- model_init_polygons (model);
-
- model->offsets[0].num_objects = num_ropes;
- model->offsets[0].objects = g_new (Object *, num_ropes);
- model->offsets[0].dx = rope_offset;
- model->offsets[0].dy = 0;
-
- for (i = 0; i < num_ropes; i++) {
- for (j = 0; j < num_rope_objects; j++) {
- x = 200 + i * rope_offset;
- y = 40 + j * stick_length;
- index = i * num_rope_objects + j;
- model->objects[index].position.x = x;
- model->objects[index].position.y = y;
- model->objects[index].previous_position.x = x;
- model->objects[index].previous_position.y = y;
-
- if (j + 1 < num_rope_objects) {
- stick_index = i * (num_rope_objects - 1) + j;
- model->sticks[stick_index].a = &model->objects[index];
- model->sticks[stick_index].b = &model->objects[index + 1];
- model->sticks[stick_index].length = stick_length;
- }
- }
+ /* Friction */
+ v.x = model->objects[i].position.x - model->objects[i].previous_position.x;
+ v.y = model->objects[i].position.y - model->objects[i].previous_position.y;
+ model->objects[i].force.x -= v.x * friction;
+ model->objects[i].force.y -= v.y * friction;
+ }
- model->offsets[0].objects[i] = &model->objects[i * num_rope_objects];
+ for (i = 0; i < model->num_springs; i++) {
+ x = model->springs[i].a->position.x;
+ y = model->springs[i].a->position.y;
+ dx = model->springs[i].b->position.x - x;
+ dy = model->springs[i].b->position.y - y;
+ distance = sqrt (dx * dx + dy * dy);
+ u.x = dx / distance;
+ u.y = dy / distance;
+ displacement = distance - model->springs[i].length;
+ model->springs[i].a->force.x += u.x * model->k * displacement;
+ model->springs[i].a->force.y += u.y * model->k * displacement;
+ model->springs[i].b->force.x -= u.x * model->k * displacement;
+ model->springs[i].b->force.y -= u.y * model->k * displacement;
}
- model->anchor_object = NULL;
-}
+ for (i = 0; i < model->num_offset_springs; i++) {
+ middle.x =
+ (model->offset_springs[i].a->position.x +
+ model->offset_springs[i].b->position.x) / 2;
+ middle.y =
+ (model->offset_springs[i].a->position.y +
+ model->offset_springs[i].b->position.y) / 2;
-static void
-model_init_grid (Model *model)
-{
- const int num_ropes = 10;
- const int num_rope_objects = 10;
- const int num_objects = num_ropes * num_rope_objects;
- const int num_strings = num_ropes * (num_rope_objects - 1) +
- (num_ropes - 1) * num_rope_objects;
- const int string_length = 10;
- const int rope_offset = 10;
- double x, y;
- int i, j, index, string_index;
+ x = middle.x - model->offset_springs[i].dx / 2;
+ y = middle.y - model->offset_springs[i].dy / 2;
- memset (model, 0, sizeof *model);
- model->objects = g_new (Object, num_objects);
- model->num_objects = num_objects;
- model->strings = g_new (String, num_strings);
- model->num_strings = num_strings;
- model->offsets = g_new (Offset, 1);
- model->num_offsets = 1;
- model_init_polygons (model);
-
- model->offsets[0].num_objects = num_ropes;
- model->offsets[0].objects = g_new (Object *, num_ropes);
- model->offsets[0].dx = rope_offset;
- model->offsets[0].dy = 0;
-
- for (i = 0; i < num_ropes; i++) {
- for (j = 0; j < num_rope_objects; j++) {
- x = 200 + i * rope_offset;
- y = 40 + j * string_length;
- index = i * num_rope_objects + j;
- model->objects[index].position.x = x;
- model->objects[index].position.y = y;
- model->objects[index].previous_position.x = x;
- model->objects[index].previous_position.y = y;
-
- if (i + 1 < num_ropes) {
- string_index = i * num_rope_objects + j;
- model->strings[string_index].a = &model->objects[index];
- model->strings[string_index].b = &model->objects[index + num_rope_objects];
- model->strings[string_index].length = string_length;
- }
-
- if (j + 1 < num_rope_objects) {
- string_index =
- (num_ropes - 1) * num_rope_objects + i * (num_rope_objects - 1) + j;
- model->strings[string_index].a = &model->objects[index];
- model->strings[string_index].b = &model->objects[index + 1];
- model->strings[string_index].length = string_length;
- }
- }
+ dx = x - model->offset_springs[i].a->position.x;
+ dy = y - model->offset_springs[i].a->position.y;
- model->offsets[0].objects[i] = &model->objects[i * num_rope_objects];
+ model->offset_springs[i].a->force.x += dx * model->k;
+ model->offset_springs[i].a->force.y += dy * model->k;
+ model->offset_springs[i].b->force.x -= dx * model->k;
+ model->offset_springs[i].b->force.y -= dy * model->k;
}
- model->anchor_object = NULL;
-}
-
-static void
-model_fini (Model *model)
-{
- g_free (model->objects);
- g_free (model->sticks);
- g_free (model->strings);
- g_free (model->offsets);
- memset (model, 0, sizeof *model);
-}
-
-static void
-model_accumulate_forces (Model *model)
-{
- int i;
-
for (i = 0; i < model->num_objects; i++) {
- model->objects[i].force.x = 0;
- model->objects[i].force.y = 3;
+ double f =
+ model->objects[i].force.x * model->objects[i].force.x +
+ model->objects[i].force.y * model->objects[i].force.y;
+
+ if (f > 100000000)
+ abort();
}
}
y = o->position.y;
o->position.x =
- x + 0.9 * (x - o->previous_position.x) + o->force.x * step * step;
+ x + (x - o->previous_position.x) + o->force.x * step * step;
o->position.y =
- y + 0.9 * (y - o->previous_position.y) + o->force.y * step * step;
+ y + (y - o->previous_position.y) + o->force.y * step * step;
o->previous_position.x = x;
o->previous_position.y = y;
dy = point->y - polygon->points[i].y;
if (polygon->normals[i].x * dx + polygon->normals[i].y * dy >= 0)
- return FALSE;
+ return polygon->enclosing;
}
- return TRUE;
+ return !polygon->enclosing;
}
static void
if (d > distance) {
distance = d;
edge = i;
- polygon->edge = i;
n = &polygon->normals[i];
}
}
}
}
+static void
+model_constrain_anchor (Model *model, Anchor *anchor)
+{
+ anchor->object->position.x = anchor->x;
+ anchor->object->position.y = anchor->y;
+ anchor->object->previous_position.x = anchor->x;
+ anchor->object->previous_position.y = anchor->y;
+}
+
static void
model_constrain_offset (Model *model, Offset *offset)
{
double dx, dy, x, y, distance, fraction;
int i;
- /* Anchor object constraint. */
- if (model->anchor_object != NULL) {
- model->anchor_object->position.x = model->anchor_position.x;
- model->anchor_object->position.y = model->anchor_position.y;
- model->anchor_object->previous_position.x = model->anchor_position.x;
- model->anchor_object->previous_position.y = model->anchor_position.y;
- }
+ if (model->mouse_anchor.object != NULL)
+ model_constrain_anchor (model, &model->mouse_anchor);
+ for (i = 0; i < model->num_anchors; i++)
+ model_constrain_anchor (model, &model->anchors[i]);
/* String constraints. */
for (i = 0; i < model->num_strings; i++) {
model->strings[i].b->position.y = y + dy * (1 - fraction);
}
+ /* Spacer constraints. */
+ for (i = 0; i < model->num_spacers; i++) {
+ x = model->spacers[i].a->position.x;
+ y = model->spacers[i].a->position.y;
+ dx = model->spacers[i].b->position.x - x;
+ dy = model->spacers[i].b->position.y - y;
+ distance = estimate_distance (dx, dy, model->spacers[i].length);
+ if (distance > model->spacers[i].length)
+ continue;
+ fraction = (distance - model->spacers[i].length) / distance / 2;
+ model->spacers[i].a->position.x = x + dx * fraction;
+ model->spacers[i].a->position.y = y + dy * fraction;
+ model->spacers[i].b->position.x = x + dx * (1 - fraction);
+ model->spacers[i].b->position.y = y + dy * (1 - fraction);
+ }
+
/* Stick constraints. */
for (i = 0; i < model->num_sticks; i++) {
x = model->sticks[i].a->position.x;
model_constrain_polygon (model, &model->polygons[i]);
}
-static void
+void
model_step (Model *model, double delta_t)
{
int i;
model_accumulate_forces (model);
model_integrate (model, delta_t);
-
- for (i = 0; i < 500; i++)
+ for (i = 0; i < 20; i++)
model_constrain (model);
model->theta += delta_t;
return sqrt (dx*dx + dy*dy);
}
-static Object *
+Object *
model_find_nearest (Model *model, double x, double y)
{
Object *object;
return object;
}
-
-typedef struct _Color Color;
-struct _Color {
- double red, green, blue;
-};
-
-static void
-draw_sticks (cairo_t *cr,
- Model *model,
- Color *color)
-{
- int i;
-
- cairo_set_source_rgba (cr, color->red, color->green, color->blue, 1);
- cairo_new_path (cr);
- cairo_set_line_width (cr, 2);
- cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
- cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
-
- for (i = 0; i < model->num_sticks; i++) {
- cairo_move_to (cr,
- model->sticks[i].a->position.x,
- model->sticks[i].a->position.y);
- cairo_line_to (cr,
- model->sticks[i].b->position.x,
- model->sticks[i].b->position.y);
- }
-
- cairo_stroke (cr);
-}
-
-static void
-draw_strings (cairo_t *cr,
- Model *model,
- Color *color)
-{
- int i;
-
- cairo_set_source_rgba (cr, color->red, color->green, color->blue, 1);
- cairo_new_path (cr);
- cairo_set_line_width (cr, 1);
- cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
- cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
-
- for (i = 0; i < model->num_strings; i++) {
- cairo_move_to (cr,
- model->strings[i].a->position.x,
- model->strings[i].a->position.y);
- cairo_line_to (cr,
- model->strings[i].b->position.x,
- model->strings[i].b->position.y);
- }
-
- cairo_stroke (cr);
-}
-
-static void
-draw_offsets (cairo_t *cr,
- Model *model,
- Color *color)
-{
- int i, j;
-
- cairo_set_source_rgba (cr, color->red, color->green, color->blue, 0.5);
- cairo_new_path (cr);
- cairo_set_line_width (cr, 4);
- cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
- cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
-
- for (i = 0; i < model->num_offsets; i++) {
- for (j = 0; j < model->offsets[i].num_objects; j++) {
- cairo_line_to (cr,
- model->offsets[i].objects[j]->position.x,
- model->offsets[i].objects[j]->position.y);
- }
- cairo_stroke (cr);
- }
-
-}
-
-static void
-draw_polygons (cairo_t *cr, Model *model, Color *color)
-{
- Polygon *p;
- int i, j;
-
- for (i = 0; i < model->num_polygons; i++) {
- p = &model->polygons[i];
- cairo_set_source_rgba (cr, color->red, color->green, color->blue, 0.4);
-
-
- for (j = 0; j < p->num_points; j++)
- cairo_line_to (cr, p->points[j].x, p->points[j].y);
- cairo_close_path (cr);
- }
- cairo_fill (cr);
-
-}
-
-static void
-draw_objects (cairo_t *cr, Model *model, Color *color)
-{
- int i;
-
- for (i = 0; i < model->num_objects; i++) {
- }
-}
-
-static Color blue = { 0, 0, 1 };
-static Color green = { 0, 1, 0 };
-static Color red = { 1, 0, 0 };
-static Color black = { 0, 0, 0 };
-static Color white = { 1, 1, 1 };
-
-typedef struct _Closure Closure;
-struct _Closure {
- GtkWidget *drawing_area;
- GtkWidget *fps_label;
- Model *model;
- int frame_count;
- int i;
- struct timeval start;
-};
-
-static void
-draw_model (GtkWidget *widget, Model *model)
-{
- cairo_t *cr;
-
- cr = gdk_cairo_create (widget->window);
-
- cairo_set_source_rgb (cr, 1, 1, 1);
- cairo_paint (cr);
-
- draw_polygons (cr, model, &blue);
- draw_sticks (cr, model, &black);
- draw_strings (cr, model, &green);
- draw_offsets (cr, model, &blue);
- draw_objects (cr, model, &white);
-
- cairo_destroy (cr);
-}
-
-static gboolean
-expose_event (GtkWidget *widget,
- GdkEventExpose *event,
- gpointer data)
-{
- Closure *closure = data;
-
- draw_model (widget, closure->model);
-
- return TRUE;
-}
-
-static gboolean
-button_press_event (GtkWidget *widget,
- GdkEventButton *event,
- gpointer data)
-{
- Closure *closure = data;
-
- if (event->button != 1)
- return TRUE;
-
- closure->model->anchor_position.x = event->x;
- closure->model->anchor_position.y = event->y;
- closure->model->anchor_object = model_find_nearest (closure->model,
- event->x, event->y);
-
- return TRUE;
-}
-
-static gboolean
-button_release_event (GtkWidget *widget,
- GdkEventButton *event,
- gpointer data)
-{
- Closure *closure = data;
-
- if ((event->state & GDK_BUTTON1_MASK) == 0)
- return TRUE;
-
- closure->model->anchor_object = NULL;
-
- return TRUE;
-}
-
-static gboolean
-motion_notify_event (GtkWidget *widget,
- GdkEventMotion *event,
- gpointer data)
-{
- Closure *closure = data;
- int x, y;
- GdkModifierType state;
-
- gdk_window_get_pointer (event->window, &x, &y, &state);
-
- closure->model->anchor_position.x = x + 0.5;
- closure->model->anchor_position.y = y + 0.5;
-
- return TRUE;
-}
-
-typedef void (*ModelInitFunc) (Model *model);
-
-static void
-model_changed (GtkComboBox *combo, gpointer user_data)
-{
- Closure *closure = user_data;
- GtkTreeIter iter;
- GtkTreeModel *tree_model;
- ModelInitFunc init;
- char *name;
-
- tree_model = gtk_combo_box_get_model (combo);
- if (!gtk_combo_box_get_active_iter (combo, &iter))
- return;
-
- gtk_tree_model_get (tree_model, &iter, 0, &name, 1, &init, -1);
-
- model_fini (closure->model);
- (*init) (closure->model);
-}
-
-static GtkTreeModel *
-create_model_store (void)
-{
- static struct {
- const char *name;
- ModelInitFunc init;
- } models[] = {
- { "Rope", model_init_rope },
- { "Snake", model_init_snake },
- { "Curtain", model_init_curtain },
- { "Grid", model_init_grid }
- };
-
- GtkTreeIter iter;
- GtkTreeStore *store;
- gint i;
-
- store = gtk_tree_store_new (2, G_TYPE_STRING, G_TYPE_POINTER);
-
- for (i = 0; i < G_N_ELEMENTS(models); i++) {
- gtk_tree_store_append (store, &iter, NULL);
- gtk_tree_store_set (store, &iter,
- 0, models[i].name, 1, models[i].init, -1);
- }
-
- return GTK_TREE_MODEL (store);
-
-}
-
-static GtkWidget *
-create_model_combo (Closure *closure)
-{
- GtkWidget *hbox;
- GtkWidget *combo, *label;
- GtkTreeModel *store;
- GtkCellRenderer *renderer;
-
- hbox = gtk_hbox_new (FALSE, 8);
-
- label = gtk_label_new_with_mnemonic ("_Model:");
- gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
-
- store = create_model_store ();
- combo = gtk_combo_box_new_with_model (store);
- gtk_combo_box_set_active (GTK_COMBO_BOX (combo), 0);
- g_object_unref (store);
-
- renderer = gtk_cell_renderer_text_new ();
- gtk_cell_layout_pack_start (GTK_CELL_LAYOUT (combo), renderer, TRUE);
- gtk_cell_layout_set_attributes (GTK_CELL_LAYOUT (combo), renderer,
- "text", 0,
- NULL);
-
- gtk_label_set_mnemonic_widget (GTK_LABEL (label), combo);
- gtk_box_pack_start (GTK_BOX (hbox), combo, FALSE, FALSE, 0);
- g_signal_connect (combo, "changed",
- G_CALLBACK (model_changed), closure);
-
- label = gtk_label_new ("Frames per second: 0");
- gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
-
- closure->fps_label = label;
-
- return hbox;
-}
-
-static void
-create_window (Closure *closure)
-{
- GtkWidget *window;
- GtkWidget *frame;
- GtkWidget *vbox;
- GtkWidget *da;
- GtkWidget *model_combo;
-
- window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
- gtk_window_set_title (GTK_WINDOW (window), "Akamaru");
-
- g_signal_connect (window, "destroy",
- G_CALLBACK (gtk_main_quit), &window);
-
- gtk_container_set_border_width (GTK_CONTAINER (window), 8);
-
- vbox = gtk_vbox_new (FALSE, 8);
- gtk_container_set_border_width (GTK_CONTAINER (vbox), 8);
- gtk_container_add (GTK_CONTAINER (window), vbox);
-
- /*
- * Create the drawing area
- */
-
- frame = gtk_frame_new (NULL);
- gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
- gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, 0);
-
- da = gtk_drawing_area_new ();
- /* set a minimum size */
- gtk_widget_set_size_request (da, 200, 200);
-
- gtk_container_add (GTK_CONTAINER (frame), da);
-
- /* Signals used to handle backing pixmap */
-
- g_signal_connect (da, "expose_event",
- G_CALLBACK (expose_event), closure);
-
- /* Event signals */
-
- g_signal_connect (da, "motion_notify_event",
- G_CALLBACK (motion_notify_event), closure);
- g_signal_connect (da, "button_press_event",
- G_CALLBACK (button_press_event), closure);
- g_signal_connect (da, "button_release_event",
- G_CALLBACK (button_release_event), closure);
-
- /* Ask to receive events the drawing area doesn't normally
- * subscribe to
- */
- gtk_widget_set_events (da, gtk_widget_get_events (da)
- | GDK_LEAVE_NOTIFY_MASK
- | GDK_BUTTON_PRESS_MASK
- | GDK_BUTTON_RELEASE_MASK
- | GDK_POINTER_MOTION_MASK
- | GDK_POINTER_MOTION_HINT_MASK);
-
- model_combo = create_model_combo (closure);
- gtk_box_pack_start (GTK_BOX (vbox), model_combo, FALSE, FALSE, 0);
-
- closure->drawing_area = da;
-}
-
-static gint
-timeout_callback (gpointer data)
-{
- Closure *closure = data;
-
- model_step (closure->model, 1);
-
- closure->i++;
- if (closure->i == 1) {
- gtk_widget_queue_draw (closure->drawing_area);
- closure->i = 0;
- closure->frame_count++;
- }
-
- if (closure->frame_count == 200) {
- struct timeval end, elapsed;
- double total;
- char text[50];
-
- closure->frame_count = 0;
- gettimeofday (&end, NULL);
- if (closure->start.tv_usec > end.tv_usec) {
- end.tv_usec += 1000000;
- end.tv_sec--;
- }
-
- elapsed.tv_usec = end.tv_usec - closure->start.tv_usec;
- elapsed.tv_sec = end.tv_sec - closure->start.tv_sec;
-
- total = elapsed.tv_sec + ((double) elapsed.tv_usec / 1e6);
- if (total < 0) {
- total = 0;
- }
- closure->start = end;
- snprintf (text, sizeof text, "Frames per second: %.2f", 200 / total);
- gtk_label_set_text (GTK_LABEL (closure->fps_label), text);
- }
-
- return TRUE;
-}
-
-int
-main (int argc, char *argv[])
-{
- Closure closure;
- Model model;
-
- gtk_init (&argc, &argv);
- model_init_rope (&model);
- create_window (&closure);
- closure.i = 0;
- gtk_widget_show_all (gtk_widget_get_toplevel (closure.drawing_area));
- closure.model = &model;
- closure.frame_count = 0;
- gettimeofday (&closure.start, NULL);
- g_timeout_add (100, timeout_callback, &closure);
- gtk_main ();
-
- return 0;
-}