/** polygons.c **/
#include <gnome.h>

gint eventDelete(GtkWidget *widget,
        GdkEvent *event,gpointer data);
gint eventDestroy(GtkWidget *widget,
        GdkEvent *event,gpointer data);
gboolean eventDraw(GtkWidget *widget,
        GdkEvent *event,gpointer data);

#define HORIZ 20
#define VERT 20
#define WIDTH (HORIZ * 29)
#define HEIGHT (VERT * 9)

static GdkPoint points[] = {
        { 80, 20 },
        { 20, 80 },
        { 40, 80 },
        { 60, 120 },
        { 20, 160 },
        { 80, 140 },
        { 140, 160 },
        { 100, 120 },
        { 120, 80 },
        { 140, 80 },
};

int main(int argc,char *argv[])
{
    GtkWidget *app;
    GtkWidget *area;

    gnome_init("polygons","1.0",argc,argv);
    app = gnome_app_new("polygons","Drawing Polygons");
    gtk_signal_connect(GTK_OBJECT(app),"delete_event",
            GTK_SIGNAL_FUNC(eventDelete),NULL);
    gtk_signal_connect(GTK_OBJECT(app),"destroy",
            GTK_SIGNAL_FUNC(eventDestroy),NULL);

    area = gtk_drawing_area_new();
    gtk_widget_set_usize(area,WIDTH,HEIGHT);
    gnome_app_set_contents(GNOME_APP(app),area);

    gtk_signal_connect(GTK_OBJECT(area),"event",
            GTK_SIGNAL_FUNC(eventDraw),NULL);

    gtk_widget_show_all(app);
    gtk_main();
    exit(0);
}
gboolean eventDraw(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    gint i;
    GdkPoint *p = malloc(sizeof(points));
    gint pointCount = sizeof(points)/sizeof(GdkPoint);

    for(i=0; i<pointCount; i++) {
        p[i].x = points[i].x;
        p[i].y = points[i].y;
    }
    gdk_draw_polygon(widget->window,
            widget->style->black_gc,
            FALSE,
            p,
            pointCount);

    for(i=0; i<pointCount; i++)
        p[i].x += 140;
    gdk_draw_polygon(widget->window,
            widget->style->white_gc,
            TRUE,
            p,
            pointCount);

    for(i=0; i<pointCount; i++)
        p[i].x += 140;
    gdk_draw_polygon(widget->window,
            widget->style->black_gc,
            FALSE,
            p,
            pointCount);
    gdk_draw_polygon(widget->window,
            widget->style->white_gc,
            TRUE,
            p,
            pointCount);

    for(i=0; i<pointCount; i++)
        p[i].x += 140;
    gdk_draw_polygon(widget->window,
            widget->style->white_gc,
            TRUE,
            p,
            pointCount);
    gdk_draw_polygon(widget->window,
            widget->style->black_gc,
            FALSE,
            p,
            pointCount);

    free(p);
    return(TRUE);
}
gint eventDelete(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    return(FALSE);
}
gint eventDestroy(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    gtk_main_quit();
    return(0);
}