added working frame-image sample

pdf2d/samples/frame-image/frame-image.go

@@ -0,0 +1,51 @@
+// Copyright 2010 The draw2d Authors. All rights reserved.
+// created: 21/11/2010 by Laurent Le Goff, Stani Michiels
+
+// Load a png image and rotate it
+package main
+
+import (
+	"image/color"
+	"math"
+
+	"github.com/stanim/draw2d"
+	"github.com/stanim/draw2d/pdf2d"
+	"github.com/stanim/gofpdf"
+)
+
+func main() {
+	// Margin between the image and the frame
+	const margin = 30
+	// Line width od the frame
+	const lineWidth = 3
+
+	// Initialize the graphic context on an RGBA image
+	dest := gofpdf.New("P", "mm", "A4", "../font")
+	dest.AddPage()
+	// Size of destination image
+	dw, dh := dest.GetPageSize()
+	gc := pdf2d.NewGraphicContext(dest)
+	// Draw frame
+	gc.SetFillColor(color.RGBA{0xff, 0xff, 0xff, 0xff})
+	draw2d.RoundRect(gc, lineWidth, lineWidth, dw-lineWidth, dh-lineWidth, 100, 100)
+	gc.SetLineWidth(lineWidth)
+	gc.FillStroke()
+
+	// load the source image
+	source, err := draw2d.LoadFromPngFile("gopher.png")
+	if err != nil {
+		panic(err)
+	}
+	// Size of source image
+	sw, sh := float64(source.Bounds().Dx()), float64(source.Bounds().Dy())
+	// Draw image to fit in the frame
+	// TODO Seems to have a transform bug here on draw image
+	scale := math.Min((dw-margin*2)/sw, (dh-margin*2)/sh)
+	gc.Translate(margin, margin)
+	gc.Scale(scale, scale)
+
+	gc.DrawImage(source)
+
+	// Save to pdf
+	pdf2d.SaveToPdfFile("frame-image.pdf", dest)
+}