X-Git-Url: https://git.cworth.org/git?p=akamaru;a=blobdiff_plain;f=akamaru.c;h=d158f3e2da5b3728882025fb3ce9c3598def2aef;hp=17c70e9303760518783a62668b22148b59ade159;hb=4ea6cfd18613d299d62dc95a4d53161d89745935;hpb=4d57fbbcfb5e364daab875ad1ff2a3f7fc2e1bb1 diff --git a/akamaru.c b/akamaru.c index 17c70e9..d158f3e 100644 --- a/akamaru.c +++ b/akamaru.c @@ -1,9 +1,4 @@ /* -*- 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 @@ -17,94 +12,47 @@ * corrections at the end instead of meaning as it goes. */ -#include -#include -#include -#include +#include #include #include -#include +#include #include -const double ground_level = 500; -const double elasticity = 0.7; - -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 _Spring Spring; -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; -}; +#include "akamaru.h" -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 _Spring { - Object *a, *b; - int length; -}; - -struct _Polygon { - int num_points; - Point *points; - Vector *normals; - int edge; -}; +const double elasticity = 0.7; +const double friction = 1; +const double gravity = 20; -struct _Model { - int num_objects; - Object *objects; - int num_sticks; - Stick *sticks; - int num_strings; - String *strings; - int num_offsets; - Offset *offsets; - int num_springs; - Spring *springs; - int num_polygons; - Polygon *polygons; - double k; - double friction; +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; +} - Object *anchor_object; - Vector anchor_position; +void +spring_init (Spring *spring, Object *a, Object *b, double length) +{ + spring->a = a; + spring->b = b; + spring->length = length; +} - double theta; -}; +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; +} -static void +void polygon_init (Polygon *p, int num_points, ...) { double dx, dy, length; @@ -137,7 +85,7 @@ polygon_init (Polygon *p, int num_points, ...) } } -static void +void polygon_init_diamond (Polygon *polygon, double x, double y) { return polygon_init (polygon, 5, @@ -148,250 +96,29 @@ polygon_init_diamond (Polygon *polygon, double x, double y) 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); } -static void -model_init_polygons (Model *model) -{ - 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; -} - -static void -model_init_snake (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; - model->objects[i].mass = 1; - - 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; - } - } - - model->anchor_object = NULL; -} - -static void -model_init_rope (Model *model) -{ - const int num_objects = 20; - const int num_sticks = num_objects - 1; - const int stick_length = 10; - 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 = 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; - model->objects[i].mass = 1; - - 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; - - 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; - model->objects[i].mass = 1; - - 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; - } - } - - model->offsets[0].objects[i] = &model->objects[i * num_rope_objects]; - } - - model->anchor_object = NULL; -} - -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; - - 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; - model->objects[index].mass = 1; - - 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; - } - } - - model->offsets[0].objects[i] = &model->objects[i * num_rope_objects]; - } - - model->anchor_object = NULL; -} - -static void -model_init_molecule (Model *model) +void +model_fini (Model *model) { - const int num_objects = 8; - const int num_springs = num_objects * 2; - const int spring_length = 50; int i; - memset (model, 0, sizeof *model); - model->objects = g_new (Object, num_objects); - model->num_objects = num_objects; - model->springs = g_new (Spring, num_springs); - model->num_springs = num_springs; - model->k = 0.2; - - for (i = 0; i < num_objects; i++) { - model->objects[i].position.x = 200 + i * 20; - model->objects[i].position.y = 200; - model->objects[i].previous_position.x = 200 + i * 20; - model->objects[i].previous_position.y = 200; - model->objects[i].mass = 0; - } - - for (i = 0; i < num_objects; i++) { - model->springs[i * 2].a = &model->objects[i]; - model->springs[i * 2].b = &model->objects[(i + 1) % num_objects]; - model->springs[i * 2].length = spring_length; - model->springs[i * 2 + 1].a = &model->objects[i]; - model->springs[i * 2 + 1].b = &model->objects[(i + 2) % num_objects]; - model->springs[i * 2 + 1].length = spring_length; - } -} - -static void -model_fini (Model *model) -{ g_free (model->objects); g_free (model->sticks); g_free (model->strings); - g_free (model->offsets); + for (i = 0; i < model->num_offsets; i++) + g_free (model->offsets[i].objects); + g_free (model->springs); + g_free (model->offset_springs); + for (i = 0; i < model->num_polygons; i++) + g_free (model->polygons[i].points); + g_free (model->polygons); + memset (model, 0, sizeof *model); } @@ -400,11 +127,19 @@ model_accumulate_forces (Model *model) { int i; double x, y, dx, dy, distance, displacement; - Vector u; + Point middle; + Vector u, v; for (i = 0; i < model->num_objects; i++) { + /* Gravity */ model->objects[i].force.x = 0; - model->objects[i].force.y = 3 * model->objects[i].mass; + model->objects[i].force.y = gravity * model->objects[i].mass; + + /* 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; } for (i = 0; i < model->num_springs; i++) { @@ -421,6 +156,35 @@ model_accumulate_forces (Model *model) model->springs[i].b->force.x -= u.x * model->k * displacement; model->springs[i].b->force.y -= u.y * model->k * displacement; } + + 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; + + x = middle.x - model->offset_springs[i].dx / 2; + y = middle.y - model->offset_springs[i].dy / 2; + + dx = x - model->offset_springs[i].a->position.x; + dy = y - model->offset_springs[i].a->position.y; + + 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; + } + + for (i = 0; i < model->num_objects; i++) { + 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(); + } } static void @@ -436,9 +200,9 @@ model_integrate (Model *model, double step) y = o->position.y; o->position.x = - x + 0.8 * (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 + 0.8 * (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; @@ -602,15 +366,14 @@ model_constrain (Model *model) 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 < 50; i++) model_constrain (model); model->theta += delta_t; @@ -627,7 +390,7 @@ object_distance (Object *object, double x, double y) return sqrt (dx*dx + dy*dy); } -static Object * +Object * model_find_nearest (Model *model, double x, double y) { Object *object; @@ -644,451 +407,3 @@ model_find_nearest (Model *model, double x, double y) 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_springs (cairo_t *cr, - Model *model, - Color *color) -{ - int i; - - cairo_set_source_rgba (cr, color->red, color->green, color->blue, 0.4); - 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_springs; i++) { - cairo_move_to (cr, - model->springs[i].a->position.x, - model->springs[i].a->position.y); - cairo_line_to (cr, - model->springs[i].b->position.x, - model->springs[i].b->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; - - cairo_set_source_rgba (cr, color->red, color->green, color->blue, 0.4); - for (i = 0; i < model->num_objects; i++) { - cairo_arc (cr, model->objects[i].position.x, - model->objects[i].position.y, - 3, 0, 2*M_PI); - cairo_fill (cr); - } -} - -static Color blue = { 0, 0, 1 }; -static Color green = { 0, 1, 0 }; -static Color red = { 1, 0, 0 }; -static Color black = { 0, 0, 0 }; - -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_springs (cr, model, &black); - draw_offsets (cr, model, &blue); - draw_objects (cr, model, &red); - - 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 }, - { "Molecule", model_init_molecule } - }; - - 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; -}