add sample: helloworld

samples/helloworld/helloworld.go

@@ -0,0 +1,51 @@
+// Copyright 2010 The draw2d Authors. All rights reserved.
+// created: 21/11/2010 by Laurent Le Goff, Stani Michiels
+
+// Package helloworld displays "Hello World" twice (one rotated) in a
+// rounded rectangle.
+package helloworld
+
+import (
+	"image"
+	"image/color"
+	"math"
+
+	"github.com/llgcode/draw2d"
+	"github.com/llgcode/draw2d/samples"
+)
+
+// Main draws "Hello World" and returns the filename. This should only be
+// used during testing.
+func Main(gc draw2d.GraphicContext, ext string) (string, error) {
+	// Draw hello world
+	Draw(gc)
+
+	// Return the output filename
+	return samples.Output("helloworld", ext), nil
+}
+
+// Draw "Hello World"
+func Draw(gc draw2d.GraphicContext) {
+	// Draw a rounded rectangle using default colors
+	draw2d.RoundRect(gc, 5, 5, 292, 205, 10, 10)
+	gc.FillStroke()
+
+	// Set the font luximbi.ttf
+	gc.SetFontData(draw2d.FontData{
+		Name:   "luxi",
+		Family: draw2d.FontFamilyMono,
+		Style:  draw2d.FontStyleBold | draw2d.FontStyleItalic})
+	// Set the fill text color to black
+	gc.SetFillColor(image.Black)
+	gc.SetDPI(72)
+	gc.SetFontSize(14)
+	// Display Hello World
+	gc.FillStringAt("Hello World", 8, 52)
+
+	gc.Save()
+	gc.SetFillColor(color.NRGBA{0xFF, 0x33, 0x33, 0xFF})
+	gc.Translate(145, 105)
+	gc.Rotate(math.Pi / 4)
+	gc.FillStringAt("Hello World", 0, 0)
+	gc.Restore()
+}