karma/flying-balls
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gravity control through scroll movements

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This commit is contained in:
Antonio Carzaniga 2021-12-01 20:28:41 +01:00
parent 87db81dcfe
commit dfd7ca908b
1 changed files with 38 additions and 2 deletions
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40
balls.c
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@ -387,6 +387,39 @@ gint keyboard_input (GtkWidget *widget, GdkEventKey *event) {
return TRUE; return TRUE;
} }
gboolean mouse_scroll (GtkWidget *widget, GdkEvent *event, gpointer user_data) {
if (event->type == GDK_SCROLL) {
GdkEventScroll * e = (GdkEventScroll*) event;
switch (e->direction) {
case GDK_SCROLL_SMOOTH: {
double dx, dy;
gdk_event_get_scroll_deltas (event, &dx, &dy);
g_x -= 10*dx;
g_y -= 10*dy;
gravity_vector_countdown = gravity_vector_init;
break;
}
case GDK_SCROLL_LEFT:
g_x -= 10;
gravity_vector_countdown = gravity_vector_init;
break;
case GDK_SCROLL_RIGHT:
g_x += 10;
gravity_vector_countdown = gravity_vector_init;
break;
case GDK_SCROLL_UP:
g_y += 10;
gravity_vector_countdown = gravity_vector_init;
break;
case GDK_SCROLL_DOWN:
g_y -= 10;
gravity_vector_countdown = gravity_vector_init;
break;
}
}
return TRUE;
}
void destroy_window (void) { void destroy_window (void) {
gtk_main_quit(); gtk_main_quit();
} }
@ -520,13 +553,16 @@ int main (int argc, const char *argv[]) {
g_signal_connect(window, "destroy", G_CALLBACK(destroy_window), NULL); g_signal_connect(window, "destroy", G_CALLBACK(destroy_window), NULL);
g_signal_connect (G_OBJECT (window), "delete-event", G_CALLBACK(destroy_window), 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); g_signal_connect(G_OBJECT (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); gtk_widget_set_events (window, GDK_EXPOSURE_MASK | GDK_SCROLL_MASK | GDK_SMOOTH_SCROLL_MASK | GDK_KEY_PRESS_MASK);
canvas = gtk_drawing_area_new (); canvas = gtk_drawing_area_new ();
g_signal_connect (G_OBJECT (canvas), "configure-event", G_CALLBACK(configure_event), NULL); g_signal_connect (G_OBJECT (canvas), "configure-event", G_CALLBACK(configure_event), NULL);
g_signal_connect (G_OBJECT (canvas), "draw", G_CALLBACK (draw_event), NULL); g_signal_connect (G_OBJECT (canvas), "draw", G_CALLBACK (draw_event), NULL);
g_signal_connect (G_OBJECT (canvas), "scroll-event",G_CALLBACK(mouse_scroll), NULL);
gtk_widget_set_events (canvas, GDK_SCROLL_MASK | GDK_SMOOTH_SCROLL_MASK);
gtk_container_add (GTK_CONTAINER (window), canvas); gtk_container_add (GTK_CONTAINER (window), canvas);
g_timeout_add (delta * 1000, timeout, canvas); g_timeout_add (delta * 1000, timeout, canvas);