concat example

examples/concat.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"math"
+
+	"github.com/fogleman/gg"
+)
+
+func main() {
+	im1, err := gg.LoadPNG("examples/lenna.png")
+	if err != nil {
+		panic(err)
+	}
+
+	im2, err := gg.LoadPNG("examples/gopher.png")
+	if err != nil {
+		panic(err)
+	}
+
+	s1 := im1.Bounds().Size()
+	s2 := im2.Bounds().Size()
+
+	width := int(math.Max(float64(s1.X), float64(s2.X)))
+	height := s1.Y + s2.Y
+
+	dc := gg.NewContext(width, height)
+	dc.DrawImage(im1, 0, 0)
+	dc.DrawImage(im2, 0, s1.Y)
+	dc.SavePNG("out.png")
+}