#include <stdio.h>#include <stdlib.h>#define MWINCLUDECOLORS#include "nano-X.h"int COLS, ROWS;GR_WINDOW_ID g_main;static voiddraw_screen(void){	GR_POINT tri[4] = { {80, 115}, {105, 115}, {55, 200}, {5, 115} };	GR_WINDOW_INFO winfo;	GR_GC_ID gc;	char dash1[2] = { 20, 20 };	char dash2[4] = { 10, 18, 4, 8 };	char dash3[4] = { 10, 18, 7, 5 };	char dash4[2] = { 8, 12 };	GrGetWindowInfo(g_main, &winfo);	/* Draw several lines and a few boxes */	gc = GrNewGC();	GrSetGCLineAttributes(gc, GR_LINE_ONOFF_DASH);	/* Draw a dashed box */	GrSetGCDash(gc, dash1, 2);	GrRect(g_main, gc, 5, 5, 100, 100);	GrSetGCDash(gc, dash2, 4);	GrLine(g_main, gc, 50, 50, 75, 75);	GrSetGCDash(gc, dash3, 4);	GrEllipse(g_main, gc, 160, 55, 50, 50);	GrSetGCDash(gc, dash4, 2);	GrPoly(g_main, gc, 4, tri);	GrDestroyGC(gc);}intmain(int argc, char **argv){	int COLS, ROWS;	if (GrOpen() < 0) {		fprintf(stderr, "Cannot open graphics\n");		exit(1);	}	COLS = 350;	ROWS = 300;	g_main = GrNewWindowEx(GR_WM_PROPS_APPWINDOW, "dashdemo",		GR_ROOT_WINDOW_ID, 100, 50, COLS - 120, ROWS - 60, BLUE);	GrSelectEvents(g_main, GR_EVENT_MASK_EXPOSURE|GR_EVENT_MASK_CLOSE_REQ);	GrMapWindow(g_main);	while (1) {		GR_EVENT event;		GrGetNextEvent(&event);		switch (event.type) {		case GR_EVENT_TYPE_EXPOSURE:			draw_screen();			break;		case GR_EVENT_TYPE_CLOSE_REQ:			GrClose();			exit(0);		}	}}