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| /* travail avec cairo en cinématique */
#include <stdio.h>
#include <cairo.h>
#include <gtk/gtk.h>
double centre_x=185.,centre_y=295.;
double sens_x=10.,sens_y=10.;
GtkWidget *drawarea; /* drawing area */
gboolean update(gpointer pData)
{
cairo_t *cr=NULL;
cr=gdk_cairo_create(drawarea->window);
cr=gdk_cairo_create(drawarea->window);
if ((centre_x+sens_x)>375.) sens_x=-sens_x;
if ((centre_x+sens_x)<20.) sens_x=-sens_x;
if ((centre_y+sens_y)>575.) sens_y=-sens_y;
if ((centre_y+sens_y)<20.) sens_y=-sens_y;
centre_x+=sens_x;
centre_y+=sens_y;
cairo_move_to(cr,centre_x+10.,centre_y);
cairo_arc(cr, centre_x,centre_y, 10., 0.,6.28);
cairo_stroke(cr);
cairo_destroy(cr);
return TRUE;
}
int main(int argc, char *argv[])
{
GtkWidget *window;
gboolean on_expose_event(GtkWidget * widget, GdkEventExpose * event, gpointer userdata);
gtk_init(&argc, &argv);
window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_default_size(GTK_WINDOW(window), 400, 600);
gtk_window_set_title(GTK_WINDOW(window), "GTK window");
drawarea=gtk_drawing_area_new();
gtk_container_add (GTK_CONTAINER(window), drawarea);
g_signal_connect(G_OBJECT(drawarea), "expose_event", G_CALLBACK(on_expose_event), NULL);
g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
g_timeout_add((guint)10, update,NULL); /* fonction appeler à intervale régulier */
gtk_widget_show_all(window);
gtk_main();
return 0;
}
gboolean on_expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer userdata)
{
cairo_t *cr=NULL;
cr=gdk_cairo_create(widget->window);
cairo_set_source_rgb(cr, .0, .0, .0);
cairo_rectangle(cr, 10.,10.,380.,580.);
cairo_move_to(cr,centre_x+10.,centre_y);
cairo_arc(cr, centre_x,centre_y, 10., 0.,6.28);
cairo_stroke(cr);
cairo_destroy(cr);
return FALSE;
} |
