/** linestyle.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 300
#define HEIGHT 350

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

    gnome_init("linestyle","1.0",argc,argv);
    app = gnome_app_new("linestyle","Line Styles");
    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) {
    int i;
    int x = 40;
    int y = 180;
    char dashList[4] = { 5, 15, 20, 30 };
    GdkGC *gc;
    GdkColormap *colormap;
    GdkColor foreground;
    GdkColor background;
    GdkFont *font;
    GdkPoint points[3] = {
        { 80, 40 },
        { 40, 120 },
        { 80, 120 }
    };

    font = gdk_font_load("vga");
    gc = gdk_gc_new(widget->window);
    colormap = gdk_colormap_get_system();
    if(gdk_color_parse("blue",&foreground)) {
        gdk_color_alloc(colormap,&foreground);
        gdk_gc_set_foreground(gc,&foreground);
    }
    if(gdk_color_parse("yellow",&background)) {
        gdk_color_alloc(colormap,&background);
        gdk_gc_set_background(gc,&background);
    }

    /*- The MITER join -*/
    gdk_gc_set_line_attributes(gc,
            10,
            GDK_LINE_SOLID,
            GDK_CAP_BUTT,
            GDK_JOIN_MITER);
    gdk_draw_polygon(widget->window,
            gc,
            FALSE,
            points,
            (int)(sizeof(points)/sizeof(GdkPoint)));
    gdk_draw_string(widget->window,
            font,
            gc,
            points[1].x,points[1].y + 20,
            "Miter");

    /*- The ROUND join -*/
    for(i=0; i<3; i++)
        points[i].x += 80;
    gdk_gc_set_line_attributes(gc,
            10,
            GDK_LINE_SOLID,
            GDK_CAP_BUTT,
            GDK_JOIN_ROUND);
    gdk_draw_polygon(widget->window,
            gc,
            FALSE,
            points,
            (int)(sizeof(points)/sizeof(GdkPoint)));
    gdk_draw_string(widget->window,
            font,
            gc,
            points[1].x,points[1].y + 20,
            "Round");

    /*- The BEVEL join -*/
    for(i=0; i<3; i++)
        points[i].x += 80;
    gdk_gc_set_line_attributes(gc,
            10,
            GDK_LINE_SOLID,
            GDK_CAP_BUTT,
            GDK_JOIN_BEVEL);
    gdk_draw_polygon(widget->window,
            gc,
            FALSE,
            points,
            (int)(sizeof(points)/sizeof(GdkPoint)));
    gdk_draw_string(widget->window,
            font,
            gc,
            points[1].x,points[1].y + 20,
            "Bevel");

    /*- Cap BUTT -*/
    gdk_gc_set_line_attributes(gc,
            10,
            GDK_LINE_SOLID,
            GDK_CAP_BUTT,
            GDK_JOIN_MITER);
    gdk_draw_line(widget->window,
            gc,
            x,y,
            x + 120,y);
    gdk_draw_string(widget->window,
            font,
            gc,
            x + 130,y + 5,
            "Butt");
    
    /*- Cap NOT LAST -*/
    y += 20;
    gdk_gc_set_line_attributes(gc,
            10,
            GDK_LINE_SOLID,
            GDK_CAP_NOT_LAST,
            GDK_JOIN_MITER);
    gdk_draw_line(widget->window,
            gc,
            x,y,
            x + 120,y);
    gdk_draw_string(widget->window,
            font,
            gc,
            x + 130,y + 5,
            "Not last");
    
    /*- Cap ROUND -*/
    y += 20;
    gdk_gc_set_line_attributes(gc,
            10,
            GDK_LINE_SOLID,
            GDK_CAP_ROUND,
            GDK_JOIN_MITER);
    gdk_draw_line(widget->window,
            gc,
            x,y,
            x + 120,y);
    gdk_draw_string(widget->window,
            font,
            gc,
            x + 130,y + 5,
            "Round");
    
    /*- Cap PROJECTING -*/
    y += 20;
    gdk_gc_set_line_attributes(gc,
            10,
            GDK_LINE_SOLID,
            GDK_CAP_PROJECTING,
            GDK_JOIN_MITER);
    gdk_draw_line(widget->window,
            gc,
            x,y,
            x + 120,y);
    gdk_draw_string(widget->window,
            font,
            gc,
            x + 130,y + 5,
            "Projecting");

    /*- Style SOLID -*/
    y += 40;
    gdk_gc_set_line_attributes(gc,
            10,
            GDK_LINE_SOLID,
            GDK_CAP_BUTT,
            GDK_JOIN_MITER);
    gdk_draw_line(widget->window,
            gc,
            x,y,
            x + 120,y);
    gdk_draw_string(widget->window,
            font,
            gc,
            x + 130,y + 5,
            "Solid");

    /*- Style ON_OFF_DASH -*/
    y += 20;
    gdk_gc_set_dashes(gc,
            0,
            dashList,
            4);
    gdk_gc_set_line_attributes(gc,
            10,
            GDK_LINE_ON_OFF_DASH,
            GDK_CAP_BUTT,
            GDK_JOIN_MITER);
    gdk_draw_line(widget->window,
            gc,
            x,y,
            x + 120,y);
    gdk_draw_string(widget->window,
            font,
            gc,
            x + 130,y + 5,
            "On off dash");

    /*- Style DOUBLE DASH -*/
    y += 20;
    gdk_gc_set_line_attributes(gc,
            10,
            GDK_LINE_DOUBLE_DASH,
            GDK_CAP_BUTT,
            GDK_JOIN_MITER);
    gdk_draw_line(widget->window,
            gc,
            x,y,
            x + 120,y);
    gdk_draw_string(widget->window,
            font,
            gc,
            x + 130,y + 5,
            "Double dash");

    gdk_font_unref(font);
    gdk_gc_unref(gc);
    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);
}