karma/flying-balls
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using canvas and local cairo context.

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This commit is contained in:
Antonio Carzaniga 2019-12-05 16:34:31 +01:00
parent 1fb6d9d94d
commit a0fa9c4925
1 changed files with 22 additions and 41 deletions
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63
balls.c
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@ -5,7 +5,6 @@
#include <time.h>
#include <gdk/gdkkeysyms.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gtk/gtk.h>
#define DEFAULT_WIDTH 800
@ -19,8 +18,6 @@ struct ball {
double v_x;
double v_y;
guchar rgb_channels[3];
cairo_surface_t * surface;
};
@ -323,12 +320,12 @@ void update_state () {
*/
GtkWidget * window;
cairo_t * cr = 0;
GtkWidget * canvas;
int gravity_vector_countdown = 0;
int gravity_vector_init = 300;
void draw_gravity_vector() {
void draw_gravity_vector(cairo_t * cr) {
if (gravity_vector_countdown != 0) {
cairo_new_path(cr);
cairo_move_to(cr, width/2, height/2);
@ -343,16 +340,9 @@ void draw_gravity_vector() {
}
}
int balls_graphics_initialized = 0;
const char * face_filename = 0;
void init_graphics() {
if (cr)
cairo_destroy(cr);
cr = gdk_cairo_create(window->window);
if (balls_graphics_initialized)
return;
cairo_surface_t * face_surface;
int face_x_offset, face_y_offset;
@ -392,28 +382,20 @@ void init_graphics() {
}
if (face_surface)
cairo_surface_destroy (face_surface);
balls_graphics_initialized = 1;
}
void destroy_graphics() {
if (cr) {
cairo_destroy(cr);
cr = 0;
}
if (balls_graphics_initialized) {
for(int i = 0; i < n_balls; ++i)
cairo_surface_destroy(balls[i].surface);
balls_graphics_initialized = 0;
}
for(int i = 0; i < n_balls; ++i)
cairo_surface_destroy(balls[i].surface);
}
void draw_balls_onto_window () {
/* clear pixmap */
cairo_t * cr = gdk_cairo_create (canvas->window);
cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, clear_alpha);
cairo_paint(cr);
draw_gravity_vector();
draw_gravity_vector(cr);
/* draw balls */
for(int i = 0; i < n_balls; ++i) {
@ -423,18 +405,16 @@ void draw_balls_onto_window () {
cairo_paint(cr);
cairo_restore(cr);
}
cairo_destroy(cr);
}
gint resize_event (GtkWidget *widget, GdkEventConfigure * event) {
gint configure_event (GtkWidget *widget, GdkEventConfigure * event) {
if (width == widget->allocation.width && height == widget->allocation.height)
return FALSE;
width = widget->allocation.width;
height = widget->allocation.height;
init_graphics();
draw_balls_onto_window();
return TRUE;
}
@ -472,11 +452,8 @@ gint keyboard_input (GtkWidget *widget, GdkEventKey *event) {
return TRUE;
}
void show_event (GtkWidget *widget, gpointer data) {
init_graphics();
}
gboolean expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer data) {
draw_balls_onto_window();
return TRUE;
}
@ -587,24 +564,28 @@ int main (int argc, const char *argv[]) {
gtk_init(0, 0);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
assert(window);
gtk_window_set_default_size(GTK_WINDOW(window), w, h);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size(GTK_WINDOW(window), width, height);
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_title(GTK_WINDOW(window), "Balls");
gtk_window_set_title(GTK_WINDOW(window), "Game");
g_signal_connect(window, "destroy", G_CALLBACK(destroy_window), NULL);
g_signal_connect(window, "expose-event", G_CALLBACK(expose_event), NULL);
g_signal_connect(window, "configure-event", G_CALLBACK(resize_event), NULL);
g_signal_connect(window, "show", G_CALLBACK(show_event), NULL);
g_signal_connect (G_OBJECT (window), "delete-event", G_CALLBACK(destroy_window), NULL);
g_signal_connect(window, "key-press-event", G_CALLBACK(keyboard_input), NULL);
gtk_widget_set_events (window, GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK | GDK_KEY_PRESS_MASK);
g_timeout_add (delta * 1000, timeout, window);
canvas = gtk_drawing_area_new ();
g_signal_connect (G_OBJECT (canvas), "expose-event", G_CALLBACK (expose_event), NULL);
g_signal_connect (G_OBJECT (canvas), "configure-event", G_CALLBACK(configure_event), NULL);
gtk_container_add (GTK_CONTAINER (window), canvas);
g_timeout_add (delta * 1000, timeout, canvas);
gtk_widget_show_all(window);
init_graphics();
gtk_main();
if (stats_sampling > 0)