From 1003203bb13f2c70c5c22b58b833c777b6b731d6 Mon Sep 17 00:00:00 2001
From: Sasha Koshka <sashakoshka@tebibyte.media>
Date: Sat, 1 Jul 2023 04:01:03 -0400
Subject: [PATCH] Glaggle example draws glaggle as expected

---
 examples/glaggle/main.go | 39 +++++++++++++++++++++++++++------------
 1 file changed, 27 insertions(+), 12 deletions(-)

diff --git a/examples/glaggle/main.go b/examples/glaggle/main.go
index fcd187a..b77f8dc 100644
--- a/examples/glaggle/main.go
+++ b/examples/glaggle/main.go
@@ -1,6 +1,7 @@
 package main
 
 import "os"
+import "math"
 import "image"
 import "image/png"
 import "git.tebibyte.media/tomo/ggfx"
@@ -13,18 +14,21 @@ func main () {
 		Bounds: img.Rect,
 		Width:  4,
 	}
-	black := []uint8 { 0,   0, 0, 255 }
-	red   := []uint8 { 255, 0, 0, 255 }
-	canvas.FillPolygon (
-		black,
-		image.Pt(10, 10),
-		image.Pt(70, 50),
-		image.Pt(20, 70))
-	canvas.StrokePolygon (
-		red, 1,
-		image.Pt(10, 10),
-		image.Pt(70, 50),
-		image.Pt(20, 70))
+	black  := []uint8 { 0,   0,   0, 255 }
+	yellow := []uint8 { 255, 255, 0, 255 }
+	midpoint := image.Pt(canvas.Bounds.Dx() / 2, canvas.Bounds.Dy() / 2)
+
+	face := circle(32, 100, midpoint)
+	canvas.FillPolygon(yellow, face...)
+	canvas.StrokePolygon(black, 2, face...)
+	
+	eye := circle(12, 16, midpoint.Add(image.Pt(-40, -30)))
+	canvas.FillPolygon(black, eye...)
+	eye = circle(12, 16, midpoint.Add(image.Pt(40, -30)))
+	canvas.FillPolygon(black, eye...)
+
+	mouth := circle(16, 70, midpoint)
+	canvas.StrokePolygon(black, 2, mouth[1:8]...)
 	
 	file, err := os.Create("TEST.png")
 	if err != nil { panic(err.Error()) }
@@ -35,3 +39,14 @@ func main () {
 	println("Open TEST.png to see the result.")
 }
 	
+func circle (resolution int, radius float64, center image.Point) []image.Point {
+	points := make([]image.Point, resolution)
+	for index := range points {
+		angle := float64(index) * ((2 * math.Pi) / float64(len(points)))
+		point := image.Pt (
+			int(math.Cos(angle) * radius),
+			int(math.Sin(angle) * radius))
+		points[index] = point.Add(center)
+	}
+	return points
+}