shell编写利用画矩形_gtk画图 矩形 弧线 文字

#include

static void destroy( GtkWidget *widget, gpointer data )

{

gtk_main_quit ();

}

static gboolean

my_expose( GtkWidget      *da,

GdkEventExpose *event,

gpointer        data )

{

GdkGC *gc1, *gc2, *gc;  /×gc1为矩形，gc2为文字×/

GdkColor color;

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 = 0;

color.blue = 65535;

gdk_gc_set_rgb_fg_color( gc2, &color );

gc = gc1;

gdk_draw_rectangle( da->window,

gc,

TRUE,//fill or not

5, 5, 100, 100 );  /×(分别是越大则向右移动、越大则向下移、越大则向右扩大、越大则向下扩大)×/

gc = gc2;

gdk_draw_arc( da->window,

gc,

FALSE, //don't fill

105, 5, 100, 100, 0, 60 * 64 );  /×(分别是越大则向右移动、越大则向下移、越大则向右扩大、越大则向下扩大、0不知道代表什么、弧线弧度)×/

PangoLayout *layout =

gtk_widget_create_pango_layout( da, "I'm a demonnfrom hell.nhahaha." );

PangoFontDescription *fontdesc =

pango_font_description_from_string( "Luxi Mono 12" );

pango_layout_set_font_description( layout, fontdesc );

gdk_draw_layout( da->window,

gc1,

5, 105, layout );

pango_font_description_free( fontdesc );

g_object_unref( layout );

g_object_unref( G_OBJECT(gc1) );

g_object_unref( G_OBJECT(gc2) );

return TRUE;

}

int main( int  argc, char *argv[] )

{

GtkWidget *window;

GtkWidget *da; //drawing area

gtk_init (&argc, &argv);

window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

g_signal_connect( G_OBJECT (window), "destroy",

G_CALLBACK (destroy), NULL );

da = gtk_drawing_area_new ();

/* set a minimum size */

gtk_widget_set_size_request( da, 300, 300 );

gtk_container_add( GTK_CONTAINER(window), da );

g_signal_connect( da, "expose_event",

G_CALLBACK(my_expose), NULL );

gtk_widget_show_all( window ); //simply show all widgets

gtk_main();

return 0;

}