I would suggest you look at doing your drawing with cairo if possible.
Once I discovered that, I gave up on calling all those gdk functions.
Read the documents on their site at, http://www.cairographics.org . It
looks like most gtk drawing is going this way. I'm also fuzzy on what
the role of the pixmap is in your example. Are you trying to draw to a
widget, or to a pixmap?
Here is an untested example off of the top of my head to do what you
want to a widget (drawing area widget that is)...
void draw(GtkWidget* widget)
{
int width = widget->allocation.width;
int height = widget->allocation.height;
cairo_t *cr gdk_cairo_create(widget->window);
int x = width / 2;
int y = height / 2;
int r = 30;
/* clearing to white: (rgb values in cairo are floating points instead of
bytes) */
cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
cairo_rectangle(, 0, 0, width, height);
cairo_fill(cr);
cairo_set_source_rgb(cr, 0.0, 1.0, 0.0);
cairo_arc(cr, x, y, r, 0.0, 0.0);
cairo_fill(cr);
cairo_set_source_rgb(cr, 1.0, 0.0, 0.0);
cairo_stroke(cr);
cairo_destroy(cr);
}
> Date: Mon, 14 Apr 2008 07:05:20 -0700 (PDT)
> From: Sergey Parhomenko <[EMAIL PROTECTED]>
> Subject: How to draw a primitive with one color and fill it with
> another?
> To: gtk-app-devel-list@gnome.org
> Message-ID: <[EMAIL PROTECTED]>
> Content-Type: text/plain; charset=iso-8859-1
>
> Hello everyone.
>
> I want to draw a red circle filled within with a green
> color on my pixmap. I've set foreground and background
> colors and passed TRUE as the "filled" parameter to
> gdk_draw_arc(). But the circle is filled with the same
> color as it is drawn, that is with the foreground
> color - red.
>
> How can I draw a red circle filled with green? The
> relevant part of my code is below.
>
> /* ... */
>
> static GdkPixmap *pixmap = NULL;
>
> void draw(GtkWidget* widget)
> {
> int width = widget->allocation.width;
> int height = widget->allocation.height;
> GdkGC *gc;
> GdkColor colors[2];
>
> int x = width / 2;
> int y = height / 2;
> int r = 30;
>
> if (pixmap)
> g_object_unref (pixmap);
> pixmap = gdk_pixmap_new (widget->window,
> width,
> height,
> -1);
> gc = gdk_gc_new((GdkDrawable *)pixmap);
> /* clearing to white: */
> gdk_draw_rectangle (pixmap,
> widget->style->white_gc,
> TRUE,
> 0, 0,
> width,
> height);
>
> gdk_color_parse("#ff0000", &colors[0]);
> gdk_color_parse("#00ff00", &colors[1]);
> /* By the way, can I get red and green GdkColor
> faster, without these gdk_color_parse()? Are some
> constants for this available? */
> gdk_gc_set_rgb_fg_color(gc, &colors[0]);
> gdk_gc_set_rgb_bg_color(gc, &colors[1]);
>
> gdk_draw_arc(pixmap, gc, TRUE, x - r / 2, y - r / 2,
> r, r, 0, 64 * 360);
> }
>
> /* ... */
>
>
>
>
>
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