/** pixels.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 WIDTH 400
#define HEIGHT 200

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

    gnome_init("pixels","1.0",argc,argv);
    app = gnome_app_new("pixels","Drawing Pixels");
    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) {
    static GdkPoint points[] = {
        { 50,100 }, { 51,100 }, { 50,101 }, { 51,101 },
        { 60,100 }, { 61,100 }, { 60,101 }, { 61,101 },
        { 55,105 }, { 56,105 }, { 55,106 }, { 56,106 },
        { 50,110 }, { 51,111 }, { 52,112 }, { 53,112 },
        { 54,113 }, { 55,113 }, { 56,113 }, { 57,113 },
        { 58,112 }, { 59,112 }, { 60,111 }, { 61,110 },
    };
    gint x = WIDTH/4;
    gint y = 0;
    gint i;

    while(y < HEIGHT) {
        for(i=0; i<10; i++) {
            gdk_draw_point(widget->window,
                    widget->style->black_gc,
                    x++,
                    y);
        }
        for(i=0; i<10; i++) {
            gdk_draw_point(widget->window,
                    widget->style->white_gc,
                    x,
                    y++);
        }
    }

    srand(1);
    for(i=0; i<2000; i++) {
        x = (int)(((double)rand()*WIDTH)/RAND_MAX);
        y = (int)(((double)rand()*HEIGHT)/RAND_MAX);
        gdk_draw_point(widget->window,
                widget->style->white_gc,
                x,
                y);
    }

    gdk_draw_points(widget->window,
                widget->style->black_gc,
                points,
                sizeof(points)/sizeof(GdkPoint));

    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);
}