commit 89babb3

init

 1@@ -0,0 +1,20 @@
 2+#!/bin/sh
 3+LIBS=`pkgconf --libs x11`
 4+OUT=xd
 5+PREFIX=${PREFIX:-/usr/local}
 6+
 7+case $1 in
 8+	make)
 9+		cc xd.c $LIBS -o $OUT
10+	;;
11+	install)
12+		[ ! -f xd ] && return
13+		cp $OUT $PREFIX/bin/$OUT
14+	;;
15+	uninstall)
16+		rm $PREFIX/bin/$OUT
17+	;;
18+	clean)
19+		rm $OUT
20+	;;
21+esac

 1@@ -0,0 +1,96 @@
 2+#include<X11/Xlib.h>
 3+#include<X11/keysym.h>
 4+
 5+#include<stdbool.h>
 6+#include<stdio.h>
 7+#include<stdlib.h>
 8+
 9+int main(void)
10+{
11+	Display *d=XOpenDisplay(NULL);
12+	if(!d)
13+	{
14+		fprintf(stderr, "couldnt open display\n");
15+		return 1;
16+	}
17+
18+	int s=DefaultScreen(d);
19+
20+	Window w=XCreateSimpleWindow(d, RootWindow(d, s),
21+			100, 100, 640, 480, 0, BlackPixel(d,s), 
22+			WhitePixel(d, s));
23+	XStoreName(d, w, "xd");
24+	/*
25+	 * exposure mask redraws lost parts on window manipulation
26+	 */
27+	XSelectInput(d, w, ExposureMask|KeyPressMask|
28+			ButtonPressMask|ButtonReleaseMask|
29+			PointerMotionMask);
30+	XMapWindow(d, w);
31+	GC gc=XCreateGC(d, w, 0, NULL);
32+	XSetForeground(d, gc, BlackPixel(d,s));
33+
34+	int z=20;
35+	XSetLineAttributes(d, gc, z, LineSolid, CapRound, JoinRound);
36+
37+	bool dr=false, er=false;
38+	int lx=0, ly=0;
39+
40+	while(1)
41+	{
42+		XEvent ev;
43+		XNextEvent(d, &ev);
44+		XSetLineAttributes(d, gc, z, LineSolid, CapRound, JoinRound);
45+
46+		switch(ev.type)
47+		{
48+			case Expose: break;
49+			case ButtonPress:
50+				if(ev.xbutton.button==Button1)
51+				{
52+					dr=true;
53+					lx=ev.xbutton.x;
54+					ly=ev.xbutton.y;
55+				}
56+				break;
57+			case ButtonRelease:
58+				if(ev.xbutton.button==Button1)
59+				{
60+					dr=false;
61+				}
62+				break;
63+			case MotionNotify:
64+
65+				if (dr)
66+				{
67+					XSetForeground(d, gc, er ? WhitePixel(d,s) : BlackPixel(d,s));
68+					XDrawLine(d,w,gc,lx,ly,
69+							ev.xmotion.x,
70+							ev.xmotion.y);
71+					lx=ev.xmotion.x;
72+					ly=ev.xmotion.y;
73+					XFlush(d);
74+				}
75+				break;
76+			case KeyPress: {
77+				KeySym k=XLookupKeysym(&ev.xkey, 0);
78+				if (k==XK_q||k==XK_Escape) goto q;
79+				if (k==XK_c) XClearWindow(d,w);
80+				if (k==XK_e) er=!er;
81+				if (k==XK_i) z+=5;
82+				if (k==XK_o) z-=5;
83+				if (k==XK_p) z=20;
84+
85+				break;
86+			}
87+		}
88+	}
89+
90+q:
91+	XFreeGC(d,gc);
92+	XDestroyWindow(d,w);
93+	XCloseDisplay(d);
94+	return 0;
95+
96+}
97+