draw_create(Display *dpy, int screen, Window win, unsigned int w, unsigned int h) {

　　Draw *draw = (Draw *)calloc(1, sizeof(Draw))

　　draw->dpy = dpy

　　draw->screen = screen

　　draw->win = win

　　draw->w = w

　　draw->h = h

　　draw->drawable = XCreatePixmap(dpy, win, w, h, DefaultDepth(dpy, screen))

　　draw->gc = XCreateGC(dpy, win, 0, NULL)