From a8e4b50cb21072c4699291cbeb243e074ff000f1 Mon Sep 17 00:00:00 2001
From: Sigrid <ftrvxmtrx@gmail.com>
Date: Sat, 23 May 2020 20:41:20 +0200
Subject: [PATCH] paint: change colors in the palette with button 3

---
 sys/man/1/paint     |  2 ++
 sys/src/cmd/paint.c | 19 ++++++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/sys/man/1/paint b/sys/man/1/paint
index 2bcbf245c..b3f1c5410 100644
--- a/sys/man/1/paint
+++ b/sys/man/1/paint
@@ -13,6 +13,8 @@ displays a canvas upon which can be drawn lines using the mouse holding
 down buttons 1 or 2 for foreground or background color.  The canvas
 may be moved with button 3.  Colors and brush sizes may be selected by
 clicking on the palette at the bottom of the screen with buttons 1 or 2.
+Clicking button 3 on the palette allows changing a color by entering its
+hex value.
 .PP
 If the optional
 .I file
diff --git a/sys/src/cmd/paint.c b/sys/src/cmd/paint.c
index 4b2087de2..4175a4d5d 100644
--- a/sys/src/cmd/paint.c
+++ b/sys/src/cmd/paint.c
@@ -515,6 +515,10 @@ drawpal(void)
 int
 hitpal(Mouse m)
 {
+	int i;
+	u32int c;
+	char buf[16], *e;
+
 	if(ptinrect(m.xy, penr)){
 		if(m.buttons & 7){
 			brush = ((m.xy.x - penr.min.x) * NBRUSH) / Dx(penr);
@@ -525,7 +529,8 @@ hitpal(Mouse m)
 	if(ptinrect(m.xy, palr)){
 		Image *col;
 
-		col = pal[(m.xy.x - palr.min.x) * nelem(pal) / Dx(palr)];
+		i = (m.xy.x - palr.min.x) * nelem(pal) / Dx(palr);
+		col = pal[i];
 		switch(m.buttons & 7){
 		case 1:
 			ink = col;
@@ -536,6 +541,18 @@ hitpal(Mouse m)
 			drawpal();
 			update(nil);
 			break;
+		case 4:
+			snprint(buf, sizeof(buf), "%06x", c64[i]);
+			if(eenter("Hex", buf, sizeof(buf), &m) == 6){
+				c = strtoll(buf, &e, 16);
+				if(*e == 0){
+					c64[i] = c;
+					freeimage(pal[i]);
+					pal[i] = allocimage(display, Rect(0, 0, 1, 1), RGB24, 1, c<<8|0xff);
+					drawpal();
+				}
+			}
+			break;
 		}
 		return 1;
 	}