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#include <stdlib.h>
#include <stdio.h>
#include <xcb/xcb.h>
int
main ()
{
xcb_connection_t *c;
xcb_screen_t *screen;
xcb_drawable_t win;
xcb_gcontext_t foreground;
xcb_generic_event_t *e;
uint32_t mask = 0;
uint32_t values[2];
/* geometric objects */
xcb_point_t points[] = {
{10, 10},
{10, 20},
{20, 10},
{20, 20}};
xcb_point_t polyline[] = {
{50, 10},
{ 5, 20}, /* rest of points are relative */
{25,-20},
{10, 10}};
xcb_segment_t segments[] = {
{100, 10, 140, 30},
{110, 25, 130, 60}};
xcb_rectangle_t rectangles[] = {
{ 10, 50, 40, 20},
{ 80, 50, 10, 40}};
xcb_arc_t arcs[] = {
{10, 100, 60, 40, 0, 90 << 6},
{90, 100, 55, 40, 0, 270 << 6}};
/* Open the connection to the X server */
c = xcb_connect (NULL, NULL);
/* Get the first screen */
screen = xcb_setup_roots_iterator (xcb_get_setup (c)).data;
/* Create black (foreground) graphic context */
win = screen->root;
foreground = xcb_generate_id (c);
mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
values[0] = screen->black_pixel;
values[1] = 0;
xcb_create_gc (c, foreground, win, mask, values);
/* Ask for our window's Id */
win = xcb_generate_id(c);
/* Create the window */
mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
values[0] = screen->white_pixel;
values[1] = XCB_EVENT_MASK_EXPOSURE;
xcb_create_window (c, /* Connection */
XCB_COPY_FROM_PARENT, /* depth */
win, /* window Id */
screen->root, /* parent window */
0, 0, /* x, y */
150, 150, /* width, height */
10, /* border_width */
XCB_WINDOW_CLASS_INPUT_OUTPUT, /* class */
screen->root_visual, /* visual */
mask, values); /* masks */
/* Map the window on the screen */
xcb_map_window (c, win);
/* We flush the request */
xcb_flush (c);
while ((e = xcb_wait_for_event (c))) {
switch (e->response_type & ~0x80) {
case XCB_EXPOSE: {
/* We draw the points */
xcb_poly_point (c, XCB_COORD_MODE_ORIGIN, win, foreground, 4, points);
/* We draw the polygonal line */
xcb_poly_line (c, XCB_COORD_MODE_PREVIOUS, win, foreground, 4, polyline);
/* We draw the segements */
xcb_poly_segment (c, win, foreground, 2, segments);
/* We draw the rectangles */
xcb_poly_rectangle (c, win, foreground, 2, rectangles);
/* We draw the arcs */
xcb_poly_arc (c, win, foreground, 2, arcs);
/* We flush the request */
xcb_flush (c);
break;
}
default: {
/* Unknown event type, ignore it */
break;
}
}
/* Free the Generic Event */
free (e);
}
return 0;
}
编译
$ gcc main.c -lxcb