samples

README

draw2d samples

Various samples for using draw2d

Using the image backend

The following Go code draws the android sample on a png image:

import (
	"image"

	"github.com/llgcode/draw2d"
	"github.com/llgcode/draw2d/samples/android"
)

function main(){}
	// Initialize the graphic context on an RGBA image
	dest := image.NewRGBA(image.Rect(0, 0, 297, 210.0))
	gc := draw2dimg.NewGraphicContext(dest)
	// Draw Android logo
	fn, err := android.Main(gc, "png")
	if err != nil {
		t.Errorf("Drawing %q failed: %v", fn, err)
		return
	}
	// Save to png
	err = draw2d.SaveToPngFile(fn, dest)
	if err != nil {
		t.Errorf("Saving %q failed: %v", fn, err)
	}
}

Using the pdf backend

The following Go code draws the android sample on a pdf document:

import (
	"image"

	"github.com/llgcode/draw2d/draw2dpdf"
	"github.com/llgcode/draw2d/samples/android"
)

function main(){}
	// Initialize the graphic context on a pdf document
	dest := draw2dpdf.NewPdf("L", "mm", "A4")
	gc := draw2dpdf.NewGraphicContext(dest)
	// Draw Android logo
	fn, err := android.Main(gc, "png")
	if err != nil {
		t.Errorf("Drawing %q failed: %v", fn, err)
		return
	}
	// Save to pdf
	err = draw2dpdf.SaveToPdfFile(fn, dest)
	if err != nil {
		t.Errorf("Saving %q failed: %v", fn, err)
	}
}

Testing

These samples are run as tests from the root package folder draw2d by:

go test ./...

Or if you want to run with test coverage:

go test -cover ./... | grep -v "no test"

The following files are responsible to run the image tests:

draw2d/test_test.go
draw2d/samples_test.go

The following files are responsible to run the pdf tests:

draw2d/pdf/test_test.go
draw2dpdf/samples_test.go

Documentation

Overview

Package samples provides examples which can be used with different backends. They are also used for testing and coverage of the draw2d package.

Index

• func Output(name, ext string) string
• func Resource(folder, filename, ext string) string

Functions

func Output

func Output(name, ext string) string

Output returns the output filename for testing.

func Resource

func Resource(folder, filename, ext string) string

Resource returns a resource filename for testing.