Add icon example

examples/glaggle/main.go

@@ -1,7 +1,6 @@
 package main
 
 import "os"
-import "math"
 import "image"
 import "image/png"
 import "git.tebibyte.media/tomo/ggfx"
@@ -18,17 +17,17 @@ func main () {
 	yellow := []uint8 { 255, 255, 0, 255 }
 	midpoint := image.Pt(canvas.Bounds.Dx() / 2, canvas.Bounds.Dy() / 2)
 
-	face := circle(32, 100, midpoint)
+	face := ggfx.Circle(32, 100, midpoint)
 	canvas.FillPolygon(yellow, face...)
 	canvas.StrokePolygon(black, 2, face...)
 	
-	eye := circle(12, 16, midpoint.Add(image.Pt(-40, -30)))
+	eye := ggfx.Circle(12, 16, midpoint.Add(image.Pt(-40, -30)))
 	canvas.FillPolygon(black, eye...)
-	eye = circle(12, 16, midpoint.Add(image.Pt(40, -30)))
+	eye = ggfx.Circle(12, 16, midpoint.Add(image.Pt(40, -30)))
 	canvas.FillPolygon(black, eye...)
 
-	mouth := circle(16, 70, midpoint)
+	mouth := ggfx.Circle(24, 70, midpoint)
-	canvas.StrokePolygon(black, 2, mouth[1:8]...)
+	canvas.PolyLine(black, 2, mouth[1:12]...)
 	
 	file, err := os.Create("TEST.png")
 	if err != nil { panic(err.Error()) }
@@ -38,15 +37,3 @@ 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
-}

examples/icon/main.go

@@ -0,0 +1,40 @@
+package main
+
+import "os"
+import "image"
+import "image/png"
+import "git.tebibyte.media/tomo/ggfx"
+
+func main () {
+	img := image.NewRGBA(image.Rect(0, 0, 256, 256))
+	canvas := ggfx.Image[uint8] {
+		Pix:    img.Pix,
+		Stride: img.Stride,
+		Bounds: img.Rect,
+		Width:  4,
+	}
+	black  := []uint8 { 0,   0,  0, 255 }
+	orange := []uint8 { 255, 48, 0, 255 }
+	midpoint := image.Pt(canvas.Bounds.Dx() / 2, canvas.Bounds.Dy() / 2)
+
+	canvas.FillRectangle(orange, canvas.Bounds)
+	for x := 1; x <= 6; x ++ {
+		point := image.Pt(x, 7 - x)
+		canvas.FillRectangle(black, image.Rectangle {
+			Min: point.Mul(32),
+			Max: point.Add(image.Pt(1, 1)).Mul(32),
+		})
+	}
+
+	ring := ggfx.Circle(32, 88, midpoint)
+	canvas.StrokePolygon(orange, 32, ring...)
+	canvas.StrokePolygon(black, 16, ring...)
+	
+	file, err := os.Create("TEST.png")
+	if err != nil { panic(err.Error()) }
+	defer file.Close()
+	err = png.Encode(file, img)
+	if err != nil { panic(err.Error()) }
+	
+	println("Open TEST.png to see the result.")
+}

polygon.go

@@ -5,7 +5,7 @@ import "image"
 
 func (this Image[T]) FillPolygon (fill []T, points ...image.Point) {
 	this.assertWidth(fill)
-	if len(points) < 2 { return }
+	if len(points) < 3 { return }
 
 	// figure out the bounds of the polygon so we don't test empty space
 	var area image.Rectangle
@@ -88,3 +88,12 @@ func (this Image[T]) StrokePolygon (stroke []T, weight int, points ...image.Poin
 		prevPoint = point
 	}
 }
+
+func (this Image[T]) PolyLine (stroke []T, weight int, points ...image.Point) {
+	if len(points) < 2 { return }
+	prevPoint := points[0]
+	for _, point := range points[1:] {
+		this.Line(stroke, weight, prevPoint, point)
+		prevPoint = point
+	}
+}

shapes.go

@@ -0,0 +1,16 @@
+package ggfx
+
+import "math"
+import "image"
+
+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
+}