refactor pdf2d.GraphicContext samples, so they can be used for test coverage

pdf2d/samples_test.go

@@ -0,0 +1,51 @@
+package pdf2d_test
+
+import (
+	"testing"
+
+	"github.com/stanim/draw2d"
+	"github.com/stanim/draw2d/pdf2d"
+
+	"github.com/stanim/draw2d.samples"
+	"github.com/stanim/draw2d.samples/android"
+	"github.com/stanim/draw2d.samples/frameimage"
+	"github.com/stanim/draw2d.samples/gopher"
+	"github.com/stanim/draw2d.samples/helloworld"
+)
+
+func test(t *testing.T, sample draw2d.Sample) {
+	// Initialize the graphic context on an RGBA image
+	dest := pdf2d.NewPdf("L", "mm", "A4")
+	gc := pdf2d.NewGraphicContext(dest)
+	// Draw Android logo
+	fn, err := sample(gc, "pdf")
+	if err != nil {
+		t.Errorf("Drawing %q failed: %v", fn, err)
+		return
+	}
+	// Save to png
+	err = pdf2d.SaveToPdfFile(fn, dest)
+	if err != nil {
+		t.Errorf("Saving %q failed: %v", fn, err)
+	}
+}
+
+func TestSampleAndroid(t *testing.T) {
+	test(t, android.Main)
+}
+
+func TestSampleGopher(t *testing.T) {
+	test(t, gopher.Main)
+}
+
+func TestSampleHelloWorld(t *testing.T) {
+	// Set the global folder for searching fonts
+	// The pdf backend needs for every ttf file its corresponding json
+	// file which is generated by gofpdf/makefont.
+	draw2d.SetFontFolder(samples.Dir("helloworld", "../"))
+	test(t, helloworld.Main)
+}
+
+func TestSampleFrameImage(t *testing.T) {
+	test(t, frameimage.Main)
+}