2 files changed, 44 insertions, 11 deletions

diff --git a/drawing/drawing.ha b/drawing/drawing.ha
index fc59e1b..54a877b 100644
--- a/drawing/drawing.ha
+++ b/drawing/drawing.ha
@@ -77,15 +77,38 @@ export fn circle(picture: *picture, c: pos, r: i32, color: u32) void = {
 	};
 };
 
+export fn circle_hollow(picture: *picture, c: pos, r: i32, color: u32) void = {
+	const (cx,cy) = c;
+	const ymin = max(0, cy-r);
+	const ymax = min(picture.h:i32-1, cy+r);
+	const xmin = max(0, cx-r);
+	const xmax = min(picture.w:i32-1, cx+r);
+
+	const r2l = r*r - r;
+	const r2u = r*r + r;
+
+	for (let y = ymin; y<=ymax; y+=1) {
+		const yd = y-cy;
+		for (let x = xmin; x<=xmax; x+=1) {
+			const xd = x-cx;
+			const v = yd*yd + xd*xd;
+			if (r2l <= v && v <= r2u) {
+				pic_set(picture, (x,y), color);
+			};
+		};
+	};
+};
 export fn perform(pictures: []picture, op: op) void = {
 	match (op) {
 	case op_other => abort("oopsy");
 	case let o: op_circle =>
-		const x = o.0, y=o.1;
+		const x = o.pos.0, y=o.pos.1;
+		const r = o.radius;
+		const c = o.color & 0xffffff;
 		for (const pic &.. pictures) {
 			let pos_within_pic =
 				(x - pic.world_pos.0, y - pic.world_pos.1): pos;
-			circle(pic, pos_within_pic, 20, 0xff0088);
+			circle(pic, pos_within_pic, r: i32, c);
 		};
 	};
 };
diff --git a/drawing/op.ha b/drawing/op.ha
index acbca29..532fd75 100644
--- a/drawing/op.ha
+++ b/drawing/op.ha
@@ -1,25 +1,35 @@
 use io;
 use endian;
 
-export type op_circle = pos;
+export type op_circle = struct {
+	pos: pos,
+	radius: u8,
+	color: u32
+};
 export type op_other = void;
 
 export type op = (op_circle| op_other);
 
+def SER_LEN: size = 13;
+
 
 // return value must be freed... for now. ehh
 export fn ser_op(op: op) []u8 = {
 	const opc = op as op_circle;
-	let buf: []u8 = alloc([0...],8);
-	endian::leputu32(buf[0..4], opc.0: u32);
-	endian::leputu32(buf[4..8], opc.1: u32);
+	let buf: []u8 = alloc([0...],SER_LEN);
+	endian::leputu32(buf[0..4], opc.pos.0: u32);
+	endian::leputu32(buf[4..8], opc.pos.1: u32);
+	endian::leputu32(buf[8..12], opc.color: u32);
+	buf[12] = opc.radius;
 	return buf;
 };
 
 export fn deser_op(bytes: []u8) op = {
-	assert(len(bytes) == 8, "wrong length somehow");
-	return (
-		endian::legetu32(bytes[0..4]): i32,
-		endian::legetu32(bytes[4..8]): i32,
-	) : op_circle;
+	assert(len(bytes) == SER_LEN, "wrong length somehow");
+	return op_circle {
+		pos = (endian::legetu32(bytes[0..4]): i32,
+			endian::legetu32(bytes[4..8]): i32),
+		color = endian::legetu32(bytes[8..12]),
+		radius = bytes[12],
+	};
 };