From 74ad09082610d27ef278fdbed892897f704168d6 Mon Sep 17 00:00:00 2001
From: rodri <rgl@antares-labs.eu>
Date: Sun, 14 Jun 2020 12:26:08 +0000
Subject: create a canvas and layers with the mouse. fixed some issues.

---
 canvas.c |  1 +
 fns.h    |  8 ++++++++
 layer.c  |  1 +
 main.c   | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++-------
 mkfile   |  1 +
 5 files changed, 64 insertions(+), 7 deletions(-)

diff --git a/canvas.c b/canvas.c
index a017fb0..abd0089 100644
--- a/canvas.c
+++ b/canvas.c
@@ -27,4 +27,5 @@ newcanvas(Point2 p, Rectangle r, ulong chan)
 	memset(&c->layers, 0, sizeof(Layer));
 	c->layers.next = &c->layers;
 	c->layers.prev = &c->layers;
+	return c;
 }
diff --git a/fns.h b/fns.h
index ece9b68..6667415 100644
--- a/fns.h
+++ b/fns.h
@@ -1,3 +1,11 @@
+/* alloc */
 void *emalloc(ulong);
 void *erealloc(void*, ulong);
 Image *eallocimage(Display*, Rectangle, ulong, int, ulong);
+
+/* canvas */
+Canvas *newcanvas(Point2, Rectangle, ulong);
+
+/* layer */
+Layer *newlayer(Canvas*);
+void rmlayer(Layer*);
diff --git a/layer.c b/layer.c
index d238b99..b8a2742 100644
--- a/layer.c
+++ b/layer.c
@@ -19,6 +19,7 @@ newlayer(Canvas *c)
 	l->next = &c->layers;
 	c->layers.prev->next = l;
 	c->layers.prev = l;
+	return l;
 }
 
 void
diff --git a/main.c b/main.c
index ad42fbb..5cb401d 100644
--- a/main.c
+++ b/main.c
@@ -41,18 +41,18 @@ initpalette(void)
 }
 
 Image*
-gencheckerboard(int w, int h)
+mkcheckerboard(int w, int h)
 {
 	Image *i, *dark, *light;
 	int x, y;
 
 	i = eallocimage(display, Rect(0,0,2*w,2*h), screen->chan, 1, DNofill);
-	dark = eallocimage(display, Rect(0,0,w,h), screen->chan, 0, DBlack&~0x7f);
-	light = eallocimage(display, Rect(0,0,w,h), screen->chan, 0, DBlack&~0xdf);
+	dark = eallocimage(display, Rect(0,0,w,h), screen->chan, 0, 0x333333FF);
+	light = eallocimage(display, Rect(0,0,w,h), screen->chan, 0, 0xEEEEEEFF);
 
-	for(y = 0; y < h; y += h)
-		for(x = 0; x < w; x += w)
-			draw(i, Rect(x,y,x+w,y+h), (x+y) % 2? light: dark, ZP);
+	for(y = 0; y < i->r.max.y; y += h)
+		for(x = 0; x < i->r.max.x; x += w)
+			draw(i, Rect(x,y,x+w,y+h), (x/w + y/h) % 2 == 0? light: dark, nil, ZP);
 
 	freeimage(dark);
 	freeimage(light);
@@ -68,7 +68,11 @@ drawlayer(Canvas *c, Layer *l)
 void
 drawcanvas(Canvas *c)
 {
+	Layer *l;
 
+	for(l = c->layers.next; l != &c->layers; l = l->next)
+		drawlayer(c, l);
+	draw(screen, screen->r, c->image, nil, ZP);
 }
 
 void
@@ -76,6 +80,9 @@ redraw(void)
 {
 	lockdisplay(display);
 	draw(screen, screen->r, pal[PCBlack], nil, ZP);
+	draw(screen, curcanvas == nil? screen->r: rectaddpt(curcanvas->image->r, toscreen(curcanvas->p)), background, nil, ZP);
+	if(curcanvas != nil)
+		drawcanvas(curcanvas);
 	flushimage(display, 1);
 	unlockdisplay(display);
 }
@@ -92,9 +99,47 @@ resized(void)
 }
 
 void
-mouse(Mousectl *mc, Keyboardctl *)
+rmb(Mousectl *mc, Keyboardctl *kc)
 {
+	enum {
+		NEW,
+		NEWLAYER
+	};
+	static char *items[] = {
+	 [NEW]		"new",
+	 [NEWLAYER]	"new layer",
+		nil
+	};
+	static Menu menu = { .item = items };
+	char buf[256], chanstr[9+1], *s;
+	ulong w, h, chan;
+	Point2 cpos;
+
+	switch(menuhit(3, mc, &menu, nil)){
+	case NEW:
+		if(curcanvas != nil)
+			break;
+		snprint(buf, sizeof buf, "%d %d %s", Dx(screen->r), Dy(screen->r), chantostr(chanstr, screen->chan));
+		enter("w h chan", buf, sizeof buf, mc, kc, nil);
+		w = strtoul(buf, &s, 10);
+		h = strtoul(s, &s, 10);
+		chan = strtochan(s);
+		cpos = Pt2(Dx(screen->r)/2 - w/2,Dy(screen->r)/2 + h/2,1);
+		curcanvas = newcanvas(cpos, Rect(0,0,w,h), chan);
+		break;
+	case NEWLAYER:
+		if(curcanvas == nil)
+			break;
+		newlayer(curcanvas);
+		break;
+	}
+}
 
+void
+mouse(Mousectl *mc, Keyboardctl *kc)
+{
+	if((mc->buttons&4) != 0)
+		rmb(mc, kc);
 }
 
 void
@@ -138,6 +183,7 @@ threadmain(int argc, char *argv[])
 	worldrf.bx = Vec2(1, 0);
 	worldrf.by = Vec2(0,-1);
 	initpalette();
+	background = mkcheckerboard(4, 4);
 
 	display->locking = 1;
 	unlockdisplay(display);
diff --git a/mkfile b/mkfile
index 90d5b2e..e83852c 100644
--- a/mkfile
+++ b/mkfile
@@ -5,6 +5,7 @@ TARG=puppeteer
 OFILES=\
 	alloc.$O\
 	layer.$O\
+	canvas.$O\
 	main.$O\
 
 HFILES=\
-- 
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