Change getting started in Readme and godoc

README.md

@@ -38,6 +38,15 @@ Quick Start
 The following Go code generates a simple drawing and saves it to an image file with package draw2d:
 
 ```go
+package main
+
+import (
+	"github.com/llgcode/draw2d/draw2dimg"
+	"image"
+	"image/color"
+)
+
+func main() {
 	// Initialize the graphic context on an RGBA image
 	dest := image.NewRGBA(image.Rect(0, 0, 297, 210.0))
 	gc := draw2dimg.NewGraphicContext(dest)
@@ -56,11 +65,20 @@ gc.FillStroke()
 
 	// Save to file
 	draw2dimg.SaveToPngFile("hello.png", dest)
+}
 ```
 
 The same Go code can also generate a pdf document with package draw2dpdf:
 
 ```go
+package main
+
+import (
+	"github.com/llgcode/draw2d/draw2dpdf"
+	"image/color"
+)
+
+func main() {
 	// Initialize the graphic context on an RGBA image
 	dest := draw2dpdf.NewPdf("L", "mm", "A4")
 	gc := draw2dpdf.NewGraphicContext(dest)
@@ -79,6 +97,7 @@ gc.FillStroke()
 
 	// Save to file
 	draw2dpdf.SaveToPdfFile("hello.pdf", dest)
+}
 ```
 
 There are more examples here: https://github.com/llgcode/draw2d/tree/master/samples

draw2d.go

@@ -26,6 +26,15 @@
 // Package draw2d itself provides a graphic context that can draw vector
 // graphics and text on an image canvas. The following Go code
 // generates a simple drawing and saves it to an image file:
+//		package main
+//
+// 		import (
+// 			"github.com/llgcode/draw2d/draw2dimg"
+// 			"image"
+// 			"image/color"
+// 		)
+//
+// 		func main() {
 // 			// Initialize the graphic context on an RGBA image
 // 			dest := image.NewRGBA(image.Rect(0, 0, 297, 210.0))
 // 			gc := draw2dimg.NewGraphicContext(dest)
@@ -43,7 +52,9 @@
 // 			gc.FillStroke()
 //
 // 			// Save to file
-//   draw2d.SaveToPngFile("hello.png", dest)
+// 			draw2dimg.SaveToPngFile("hello.png", dest)
+// 		}
+//
 //
 // There are more examples here:
 // https://github.com/llgcode/draw2d/tree/master/samples