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/*
* java-gnome, a UI library for writing GTK and GNOME programs from Java!
*
* Copyright © 2007-2010 Operational Dynamics Consulting, Pty Ltd and Others
*
* The code in this file, and the program it is a part of, is made available
* to you by its authors as open source software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License version
* 2 ("GPL") as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GPL for more details.
*
* You should have received a copy of the GPL along with this program. If not,
* see http://www.gnu.org/licenses/. The authors of this program may be
* contacted through http://java-gnome.sourceforge.net/.
*/
package org.freedesktop.cairo;
import java.io.File;
import java.io.IOException;
import org.gnome.gtk.Gtk;
import org.gnome.gtk.GraphicalTestCase;
/**
* Started life as the Cairo drawing example; evolved to a unit test. This
* TestCase is predicated on the assumption that PNGs are deterministic. I
* don't know of anything that actually guarantees or requires this to be the
* case, but it seems a reasonable guess, given that it is ultimately just a
* pixel mapping. Perhaps compression will get in the way; if so, switch this
* to a TIFF.
*
* <p>
* As you will see, the file being compared was (can be) generated with this
* code, so if you need to redo this run it as an executable.
*
* @author Andrew Cowie
*/
/*
* TODO Actually do the comaprison!
*/
public class ValidateDrawingToFile extends GraphicalTestCase
{
private static String OUTPUT_FILENAME = "tmp/tests/ValidateDrawingToFile.png";
private static void draw() {
final Context cr;
final ImageSurface surface;
surface = new ImageSurface(Format.ARGB32, 100, 100);
cr = new Context(surface);
cr.setSource(0.0, 0.0, 1.0, 0.8);
cr.moveTo(10, 10);
cr.lineTo(20, 5);
cr.stroke();
try {
surface.writeToPNG(OUTPUT_FILENAME);
} catch (IOException e) {
fail("Unexpected file write error");
}
try {
surface.writeToPNG("/an/inexistent/filename");
fail("You should get an IOException");
} catch (IOException e) {
// ok
}
}
public final void testImageSurfaceWriteToPNG() {
final File target;
target = new File(OUTPUT_FILENAME);
if (target.exists()) {
target.delete();
}
draw();
assertTrue("PNG output not found", target.exists());
/*
* TODO compare output to some canonical example! How? Compare MD5
* sums? Load the two images and compare pixels? And where are we
* storing the other file in the tree?
*/
}
public static void main(String[] args) {
Gtk.init(args);
draw();
}
}
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