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/* Un exemple pour utiliser le "Graphic Context" XOR directement
* sans passer par GDK (les GdkGC n'existent pas dans GTK-3)
*
* En deplacant la souris avec un bouton enfonce',
* on fait apparaitre une ligne elastique tracee avec le mode XOR
*
* Fonctionne sous X11 (GTK-2 ou GTK-3: adapter la Makefile)
* ou MSWindows (teste' seulement pour GTK-2)
* MANQUE LE CAS DE MAC OS-X AVEC QUARTZ: AVIS AUX AMATEURS.
*
* Compiler avec ( -lX11 avec la Xlib only)
* Pour GTK-2
* gcc -g -Wall `pkg-config --cflags gtk+-2.0` xor_gtk.c `pkg-config --libs gtk+-2.0` -lX11
* et GTK-3
* gcc -g -Wall `pkg-config --cflags gtk+-3.0` xor_gtk.c `pkg-config --libs gtk+-3.0` -lX11
*/
#include <math.h>
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <cairo.h>
/* Taille de la fenêtre en pixels */
static int ix = 800;
static int iy = 500;
static GdkDisplay *gg_disp;
static GdkWindow *gg_win;
#if defined (GDK_WINDOWING_X11)
#include <X11/Xlib.h>
#include <gdk/gdkx.h>
#include <cairo/cairo-xlib.h>
static Display *x_disp;
static Window x_canvas;
static GC x_gc_xor;
#elif defined (GDK_WINDOWING_WIN32)
#define _WIN32_WINNT 0x0500
#include <windows.h>
#include <gdk/gdkwin32.h>
static HWND hwnd;
static HDC hdc ,hdc_xor;
#endif
/*
* Creation de l'image de fond
*/
#if (GTK_MAJOR_VERSION == 2)
gboolean ev_expose (GtkWidget *w ,GdkEventExpose *event ,gpointer data)
{
cairo_t *cr;
cr = gdk_cairo_create (gtk_widget_get_window(w));
#else
gboolean ev_expose (GtkWidget *w ,cairo_t *cr ,gpointer data)
{
#endif
gdouble dx ,dy;
dx = (gdouble)ix / 6.0;
dy = (gdouble)iy / 6.0;
/* rectangle noir */
cairo_set_source_rgb (cr ,0.0 ,0.0, 0.0);
cairo_rectangle (cr ,dx ,dy ,dx ,dy);
cairo_fill (cr);
/* cercle rouge */
cairo_set_source_rgb (cr ,1.0 ,0.0, 0.0);
cairo_arc (cr ,3*dx ,1.5*dy ,dx/2.0 ,0.0 ,6.2831853);
cairo_fill (cr);
/* cercle vert */
cairo_set_source_rgb (cr ,0.0 ,1.0, 0.0);
cairo_arc (cr ,1.5*dx ,3*dy ,dx/2.0 ,0.0 ,6.2831853);
cairo_fill (cr);
/* rectangle bleu */
cairo_set_source_rgb (cr ,0.0 ,0.0, 1.0);
cairo_rectangle (cr ,2.5*dx ,2.5*dy ,dx ,dy);
cairo_fill (cr);
return TRUE;
}
/*
* Reponses aux actions avec la souris
*/
static int old_x ,old_y ,button_pressed = FALSE;;
gint ev_button_press (GtkWidget *w ,GdkEvent *event ,gpointer data)
{
gint x ,y;
x = (gint) event->button.x;
y = (gint) event->button.y;
#ifdef GDK_WINDOWING_X11
XDrawLine (x_disp ,x_canvas ,x_gc_xor ,0 ,0 ,x ,y);
#elif defined (GDK_WINDOWING_WIN32)
MoveToEx (hdc ,0 ,0 ,(LPPOINT) NULL);
LineTo (hdc ,x ,y);
#endif
old_x = x;
old_y = y;
button_pressed = TRUE;
return TRUE;
}
gint ev_button_release (GtkWidget *w ,GdkEvent *event ,gpointer data)
{
gint x ,y;
x = (gint) event->button.x;
y = (gint) event->button.y;
#ifdef GDK_WINDOWING_X11
XDrawLine (x_disp ,x_canvas ,x_gc_xor ,0 ,0 ,old_x ,old_y);
#elif defined (GDK_WINDOWING_WIN32)
MoveToEx (hdc ,0 ,0 ,(LPPOINT) NULL);
LineTo (hdc ,old_x ,old_y);
#endif
button_pressed = FALSE;
return TRUE;
}
int ev_pointer_motion (GtkWidget *w ,GdkEvent *event ,gpointer data)
{
int x ,y;
if (button_pressed ) {
x = (gint) event->motion.x;
y = (gint) event->motion.y;
#ifdef GDK_WINDOWING_X11
XDrawLine (x_disp ,x_canvas ,x_gc_xor ,0 ,0 ,old_x ,old_y);
XDrawLine (x_disp ,x_canvas ,x_gc_xor ,0 ,0 ,x ,y);
#elif defined (GDK_WINDOWING_WIN32)
MoveToEx (hdc ,0 ,0 ,(LPPOINT) NULL);
LineTo (hdc ,old_x ,old_y);
MoveToEx (hdc ,0 ,0 ,(LPPOINT) NULL);
LineTo (hdc ,x ,y);
#endif
old_x = x;
old_y = y;
}
return TRUE;
}
/*
* Programme principal
*/
int main( int argc ,char *argv[] )
{
GtkWidget *w_main_window ,*w_canvas;
#ifdef GDK_WINDOWING_X11
XGCValues x_gc_val;
unsigned long valuemask;
#endif
gtk_init (&argc ,&argv);
printf ("GTK_MAJOR_VERSION = %d\n" ,GTK_MAJOR_VERSION);
w_main_window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gg_disp = gdk_display_get_default ();
w_canvas = gtk_drawing_area_new ();
gtk_widget_set_size_request (w_main_window ,ix ,iy);
gtk_container_add (GTK_CONTAINER (w_main_window) ,w_canvas );
gtk_widget_add_events (w_canvas
, GDK_BUTTON_PRESS_MASK
| GDK_BUTTON_RELEASE_MASK
| GDK_POINTER_MOTION_MASK
);
gtk_widget_show_all (w_main_window);
gg_win = gtk_widget_get_window (w_canvas);
#ifdef GDK_WINDOWING_X11
x_disp = gdk_x11_display_get_xdisplay (gg_disp);
#if (GTK_MAJOR_VERSION == 2)
x_canvas = gdk_x11_drawable_get_xid (gg_win);
#else
x_canvas = gdk_x11_window_get_xid (gg_win);
#endif
x_gc_val.function = GXxor;
x_gc_val.foreground = 0xffffff;
x_gc_val.line_width = 4;
valuemask = GCFunction | GCForeground | GCLineWidth;
x_gc_xor = XCreateGC (x_disp ,x_canvas ,valuemask ,&x_gc_val);
#elif defined (GDK_WINDOWING_WIN32)
hwnd = GDK_WINDOW_HWND (gg_win);
hdc = GetDC (hwnd);
hdc_xor = CreateCompatibleDC (hdc);
SetROP2 (hdc ,R2_XORPEN);
SelectObject (hdc ,GetStockObject(DC_PEN));
SetDCPenColor (hdc, RGB (0,255,0));
#endif
#if (GTK_MAJOR_VERSION == 2)
g_signal_connect (w_canvas ,"expose_event" ,G_CALLBACK (ev_expose) ,NULL);
#else
g_signal_connect (w_canvas ,"draw" ,G_CALLBACK (ev_expose) ,NULL);
#endif
g_signal_connect (w_canvas ,"button-press-event" ,G_CALLBACK (ev_button_press) ,NULL);
g_signal_connect (w_canvas ,"button-release-event" ,G_CALLBACK (ev_button_release) ,NULL);
g_signal_connect (w_canvas ,"motion-notify-event" ,G_CALLBACK (ev_pointer_motion) ,NULL);
g_signal_connect (w_main_window ,"delete_event" ,G_CALLBACK (gtk_main_quit) ,NULL);
gtk_widget_show_all (w_main_window);
gtk_main ();
return 0;
} |
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