gtk-drawing demo on win32

[Pieter Engelen <engelen pieter gmail com>]

Hi,
for a while now, I'm trying to compile the following demo.


#include <win32config.h>
#include <gtk/gtk.h>

int main( int argc, char **argv )
{gtk_init(&argc, &argv );

static GtkWidget *window = NULL;
/* Pixmap for scribble area, to store current scribbles */
static GdkPixmap *pixmap = NULL;

/* Create a new pixmap of the appropriate size to store our scribbles */
static gboolean
scribble_configure_event (GtkWidget         *widget,
                        GdkEventConfigure *event,
                        gpointer           data)
{
if (pixmap)
  g_object_unref (pixmap);

pixmap = gdk_pixmap_new (widget->window,
                         widget->allocation.width,
                         widget->allocation.height,
                         -1);

/* Initialize the pixmap to white */
gdk_draw_rectangle (pixmap,
                    widget->style->white_gc,
                    TRUE,
                    0, 0,
                    widget->allocation.width,
                    widget->allocation.height);

/* We've handled the configure event, no need for further processing. */
return TRUE;
}

/* Redraw the screen from the pixmap */
static gboolean
scribble_expose_event (GtkWidget      *widget,
                     GdkEventExpose *event,
                     gpointer        data)
{
/* We use the "foreground GC" for the widget since it already exists,
 * but honestly any GC would work. The only thing to worry about
 * is whether the GC has an inappropriate clip region set.
 */

gdk_draw_drawable (widget->window,
                   widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
                   pixmap,
                   /* Only copy the area that was exposed. */
                   event->area.x, event->area.y,
                   event->area.x, event->area.y,
                   event->area.width, event->area.height);

return FALSE;
}

/* Draw a rectangle on the screen */
static void
draw_brush (GtkWidget *widget,
          gdouble    x,
          gdouble    y)
{
GdkRectangle update_rect;

update_rect.x = x - 3;
update_rect.y = y - 3;
update_rect.width = 6;
update_rect.height = 6;

/* Paint to the pixmap, where we store our state */
gdk_draw_rectangle (pixmap,
                    widget->style->black_gc,
                    TRUE,
                    update_rect.x, update_rect.y,
                    update_rect.width, update_rect.height);

/* Now invalidate the affected region of the drawing area. */
gdk_window_invalidate_rect (widget->window,
                            &update_rect,
                            FALSE);
}

static gboolean
scribble_button_press_event (GtkWidget      *widget,
                           GdkEventButton *event,
                           gpointer        data)
{
if (pixmap == NULL)
  return FALSE; /* paranoia check, in case we haven't gotten a
configure event */

if (event->button == 1)
  draw_brush (widget, event->x, event->y);

/* We've handled the event, stop processing */
return TRUE;
}

static gboolean
scribble_motion_notify_event (GtkWidget      *widget,
                            GdkEventMotion *event,
                            gpointer        data)
{
int x, y;
GdkModifierType state;

if (pixmap == NULL)
  return FALSE; /* paranoia check, in case we haven't gotten a
configure event */

/* This call is very important; it requests the next motion event.
 * If you don't call gdk_window_get_pointer() you'll only get
 * a single motion event. The reason is that we specified
 * GDK_POINTER_MOTION_HINT_MASK to gtk_widget_set_events().
 * If we hadn't specified that, we could just use event->x, event->y
 * as the pointer location. But we'd also get deluged in events.
 * By requesting the next event as we handle the current one,
 * we avoid getting a huge number of events faster than we
 * can cope.
 */

gdk_window_get_pointer (event->window, &x, &y, &state);

if (state & GDK_BUTTON1_MASK)
  draw_brush (widget, x, y);

/* We've handled it, stop processing */
return TRUE;
}

static gboolean
checkerboard_expose (GtkWidget      *da,
                   GdkEventExpose *event,
                   gpointer        data)
{
gint i, j, xcount, ycount;
GdkGC *gc1, *gc2;
GdkColor color;

#define CHECK_SIZE 10
#define SPACING 2

/* At the start of an expose handler, a clip region of event->area
 * is set on the window, and event->area has been cleared to the
 * widget's background color. The docs for
 * gdk_window_begin_paint_region() give more details on how this
 * works.
 */

/* It would be a bit more efficient to keep these
 * GC's around instead of recreating on each expose, but
 * this is the lazy/slow way.
 */
gc1 = gdk_gc_new (da->window);
color.red = 30000;
color.green = 0;
color.blue = 30000;
gdk_gc_set_rgb_fg_color (gc1, &color);

gc2 = gdk_gc_new (da->window);
color.red = 65535;
color.green = 65535;
color.blue = 65535;
gdk_gc_set_rgb_fg_color (gc2, &color);

xcount = 0;
i = SPACING;
while (i < da->allocation.width)
  {
    j = SPACING;
    ycount = xcount % 2; /* start with even/odd depending on row */
    while (j < da->allocation.height)
      {
        GdkGC *gc;

        if (ycount % 2)
          gc = gc1;
        else
          gc = gc2;

        /* If we're outside event->area, this will do nothing.
         * It might be mildly more efficient if we handled
         * the clipping ourselves, but again we're feeling lazy.
         */
        gdk_draw_rectangle (da->window,
                            gc,
                            TRUE,
                            i, j,
                            CHECK_SIZE,
                            CHECK_SIZE);

        j += CHECK_SIZE + SPACING;
        ++ycount;
      }

    i += CHECK_SIZE + SPACING;
    ++xcount;
  }

g_object_unref (gc1);
g_object_unref (gc2);

/* return TRUE because we've handled this event, so no
 * further processing is required.
 */
return TRUE;
}

GtkWidget *
do_drawingarea (GtkWidget *do_widget)
{
GtkWidget *frame;
GtkWidget *vbox;
GtkWidget *da;
GtkWidget *label;

if (!window)
  {
    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    gtk_window_set_screen (GTK_WINDOW (window),
                           gtk_widget_get_screen (do_widget));
    gtk_window_set_title (GTK_WINDOW (window), "Drawing Area");

    g_signal_connect (window, "destroy", G_CALLBACK
(gtk_widget_destroyed), &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 checkerboard area
     */

    label = gtk_label_new (NULL);
    gtk_label_set_markup (GTK_LABEL (label),
                          "<u>Checkerboard pattern</u>");
    gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);

    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, 100, 100);

    gtk_container_add (GTK_CONTAINER (frame), da);

    g_signal_connect (da, "expose_event",
                      G_CALLBACK (checkerboard_expose), NULL);

    /*
     * Create the scribble area
     */

    label = gtk_label_new (NULL);
    gtk_label_set_markup (GTK_LABEL (label),
                          "<u>Scribble area</u>");
    gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);

    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, 100, 100);

    gtk_container_add (GTK_CONTAINER (frame), da);

    /* Signals used to handle backing pixmap */

    g_signal_connect (da, "expose_event",
                      G_CALLBACK (scribble_expose_event), NULL);
    g_signal_connect (da,"configure_event",
                      G_CALLBACK (scribble_configure_event), NULL);

    /* Event signals */

    g_signal_connect (da, "motion_notify_event",
                      G_CALLBACK (scribble_motion_notify_event), NULL);
    g_signal_connect (da, "button_press_event",
                      G_CALLBACK (scribble_button_press_event), NULL);

    /* 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_POINTER_MOTION_MASK
                           | GDK_POINTER_MOTION_HINT_MASK);

  }

if (!GTK_WIDGET_VISIBLE (window))
  {
    gtk_widget_show_all (window);
  }
else
  {
    gtk_widget_destroy (window);
    window = NULL;
  }

      return window;

}

gtk_main();
return 0;
}


I get the next error msg's.

(7) : error C2143: syntax error : missing ';' before 'type'
(9) : error C2143: syntax error : missing ';' before 'type'
(12) : error C2143: syntax error : missing ';' before 'type'
(20) : error C2065: 'pixmap' : undeclared identifier
(20) : error C2065: 'widget' : undeclared identifier
(20) : error C2223: left of '->window' must point to struct/union
(21) : error C2223: left of '->allocation' must point to struct/union
(22) : error C2223: left of '->allocation' must point to struct/union
(23) : warning C4047: 'function' : 'struct _GdkDrawable *' differs in
levels of indirection from 'const int '
(23) : warning C4024: 'gdk_pixmap_new' : different types for formal
and actual parameter 1
(23) : error C2198: 'gdk_pixmap_new' : too few actual parameters
(23) : warning C4047: '=' : 'int ' differs in levels of indirection
from 'struct _GdkDrawable *'
(26) : warning C4047: 'function' : 'struct _GdkDrawable *' differs in
levels of indirection from 'int '
(26) : warning C4024: 'gdk_draw_rectangle' : different types for
formal and actual parameter 1
(27) : error C2223: left of '->style' must point to struct/union
(30) : error C2223: left of '->allocation' must point to struct/union
(31) : error C2223: left of '->allocation' must point to struct/union
(31) : error C2198: 'gdk_draw_rectangle' : too few actual parameters
(39) : error C2061: syntax error : identifier 'scribble_expose_event'
(39) : error C2059: syntax error : ';'
(39) : error C2059: syntax error : 'type'
(67) : warning C4244: '=' : conversion from 'double ' to 'int ',
possible loss of data
68) : warning C4244: '=' : conversion from 'double ' to 'int ',
possible loss of data
(73) : warning C4047: 'function' : 'struct _GdkDrawable *' differs in
levels of indirection from 'int '
(73) : warning C4024: 'gdk_draw_rectangle' : different types for
formal and actual parameter 1
(90) : warning C4047: '==' : 'int ' differs in levels of indirection
from 'void *'
(109) : warning C4047: '==' : 'int ' differs in levels of indirection
from 'void *'
(219) : error C2065: 'window' : undeclared identifier
(221) : warning C4047: '=' : 'int ' differs in levels of indirection
from 'struct _GtkWidget *'
(227) : warning C4022: 'g_signal_connect_data' : pointer mismatch for
actual parameter 1
(279) : error C2065: 'scribble_expose_event' : undeclared identifier
(281) : error C2065: 'scribble_configure_event' : undeclared identifier
(303) : warning C4047: 'function' : 'struct _GtkWidget *' differs in
levels of indirection from 'int '
(303) : warning C4024: 'gtk_widget_show_all' : different types for
formal and actual parameter 1
(307) : warning C4047: 'function' : 'struct _GtkWidget *' differs in
levels of indirection from 'int '
(307) : warning C4024: 'gtk_widget_destroy' : different types for
formal and actual parameter 1
(308) : warning C4047: '=' : 'int ' differs in levels of indirection
from 'void *'
(311) : warning C4047: 'return' : 'struct _GtkWidget *' differs in
levels of indirection from 'int '
(315) : error C2371: 'gtk_main' : redefinition; different basic types
       c:\gtk2.4.7dev\include\gtk-2.0\gtk\gtkmain.h(136) : see
declaration of 'gtk_main'
(316) : error C2059: syntax error : 'return'
(317) : error C2059: syntax error : '}'
Error executing cl.exe.


I have been bussy with this for a while, but I didn't find the problem.
The code is correct (I think).

The problem is probaly the way I use gtk-stuff,
I have 
cmd-line option --use wintab
and under tool->options-> directories-> Ihave putten my path's to the gtk-stuff.
I have compilled other demo and there were no ptoblems.

Any idee???

Greetz