shithub: dpaint

Download patch

ref: 363056d387d355804f182d3161c63aa3b56d313f
parent: abf3fb949510d09d9c2da348ce3a4c4a7a80cadb
author: Clay Ayers <thedaemon@thedaemons.space>
date: Wed Oct 11 18:32:44 EDT 2023 

e


--- /dev/null
+++ b/0paint.c
@@ -1,0 +1,49 @@
+/*
+ * written in plan 9 c dialect
+ * thedaemon
+*/
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <event.h>
+
+void
+main(void)
+{
+	Mouse m;
+	Point prevm; /* previous mouse position */
+	initdraw(0, 0, "0 Paint");
+	eresized(0);
+	einit(Emouse);
+	int brush = 1;
+	int eraser = 4;
+
+	for(;;){
+		m = emouse();
+
+		if(m.buttons & 2)
+			break;
+		if(m.buttons & 4) { 
+			line(screen,
+			     prevm.x == -1 ? m.xy : prevm,
+			     m.xy, Enddisc, Enddisc, eraser, display->white, ZP);
+			prevm = m.xy;
+		} 
+		if(m.buttons & 1) { /* Paint Function  ? : is if else true and false*/
+			line(screen,
+			     prevm.x == -1 ? m.xy : prevm,
+			     m.xy, Enddisc, Enddisc, brush, display->black, ZP); /* ZP is a constant point (0,0) */
+			prevm = m.xy;
+		} else {
+			prevm = Pt(-1, -1);
+		}
+	}
+}
+
+void
+eresized(int new)
+{
+	USED(new);
+	if(getwindow(display, Refnone) < 0)
+		sysfatal("resize failed: %r");
+}