concat.go

concat.go

@@ -0,0 +1,56 @@
+//go:build todo
+package imageutils
+
+import (
+	"image"
+	"image/color"
+	"image/draw"
+)
+
+type pair struct {
+	first, second image.Image
+}
+
+func (p pair) ColorModel() color.Model { return p.first.ColorModel() }
+
+func (p pair) Bounds() image.Rectangle {
+	var (
+		b1 = p.first.Bounds()
+		b2 = p.second.Bounds()
+	)
+
+	return image.Rectangle{
+		image.ZP,
+		image.Point{
+			X: b1.Dx() + b2.Dx(),
+			Y: max(b1.Dy(), b2.Dy()),
+		},
+	}
+}
+
+func (p pair) At(x, y int) color.Color {
+	rgbaImg := image.NewRGBA(p.Bounds())
+	draw.Draw(
+		rgbaImg,
+		rgbaImg.Bounds(),
+		p.first,
+		image.ZP,
+		draw.Src,
+	)
+	draw.Draw(
+		rgbaImg,
+		p.Bounds(),
+		p.second,
+		image.Point{
+			p.first.Bounds().Dx(),
+			0,
+		},
+		draw.Src,
+	)
+	return rgbaImg
+}
+
+// Concat concatenates second image to the right side of first.
+func Concat(i1, i2 image.Image) image.Image {
+	return pair{i1, i2}
+}

scale.go

@@ -42,5 +42,5 @@ func Scale(img image.Image, scale int) image.Image {
 	if scale < 1 {
 		scale = 1
 	}
-	return rescaled{img, scale}	
+	return rescaled{img, scale}
 }