go fmt

cmd/playground/circles/circles.go

@@ -29,14 +29,14 @@ func Circles(b image.Rectangle, radius int) chan iu.Circle {
 
 var exchange = color.ModelFunc(
 	func(c color.Color) color.Color {
-		if color.Alpha16Model.Convert(c) == color.Transparent{
+		if color.Alpha16Model.Convert(c) == color.Transparent {
 			return color.Opaque
 		}
 		return color.Transparent
 	},
 )
 
-type Exchange struct { image.Image }
+type Exchange struct{ image.Image }
 
 func (e Exchange) ColorModel() color.Model { return color.Alpha16Model }
 func (e Exchange) Bounds() image.Rectangle { return e.Image.Bounds() }
@@ -47,7 +47,7 @@ func (e Exchange) At(x, y int) color.Color {
 
 var blackAndWhite = color.ModelFunc(
 	func(c color.Color) color.Color {
-		if color.Alpha16Model.Convert(c) == color.Transparent{
+		if color.Alpha16Model.Convert(c) == color.Transparent {
 			return color.Black
 		}
 		return color.White
@@ -55,7 +55,7 @@ var blackAndWhite = color.ModelFunc(
 )
 
 // Black and white's alpha image.
-type BlackAndWhite struct { image.Image }
+type BlackAndWhite struct{ image.Image }
 
 func (b BlackAndWhite) ColorModel() color.Model { return color.GrayModel }
 func (b BlackAndWhite) Bounds() image.Rectangle { return b.Image.Bounds() }

cmd/playground/circles/colored.go

@@ -15,10 +15,10 @@ func main() {
 	circles := Circles(canvas.Bounds(), 2160/6)
 
 	palette := []color.Color{
-		color.RGBA{R:255, A:255},
-		color.RGBA{G:255, A:255},
-		color.RGBA{B:255, A:255},
+		color.RGBA{R: 255, A: 255},
+		color.RGBA{G: 255, A: 255},
+		color.RGBA{B: 255, A: 255},
 	}
 	c := palette[rand.Int()%2]
-	
+
 }

cmd/playground/circles/main.go

@@ -10,10 +10,10 @@ func main() {
 
 		draw.Draw(canvas, c.Bounds(), xor{c, canvas}, c.Bounds().Min, draw.Src)
 		/*
-		draw.DrawMask(
-			canvas, canvas.Bounds(), &image.Uniform{color.White},
-			image.Point{}, xor{c, canvas}, image.Point{}, draw.Src,
-		)
+			draw.DrawMask(
+				canvas, canvas.Bounds(), &image.Uniform{color.White},
+				image.Point{}, xor{c, canvas}, image.Point{}, draw.Src,
+			)
 		*/
 	}
 	/*

cmd/playground/circles/xor.go

@@ -11,7 +11,7 @@ func (t xor) At(x, y int) color.Color {
 	srcColor := t.ColorModel().Convert(t.src.At(x, y))
 
 	// xor operation (a || b) && !(a && b)
-	if ((dstColor == color.Opaque) || (srcColor == color.Opaque)) && 
+	if ((dstColor == color.Opaque) || (srcColor == color.Opaque)) &&
 		!((dstColor == color.Opaque) && (srcColor == color.Opaque)) {
 		return color.Opaque
 	}

cmd/playground/circles/xor_colored.go

@@ -1,3 +1 @@
 package main
-
-