Monday Apr 26, 2010

JavaFX [1.3] - Save As Image


JavaFX - Save As Image code updated to be compatible with JavaFX 1.3
Please refer to JavaFX13Utils.fx for more information. You will need to update only if you are using internal APIs as mentioned in this forum thread.

<script src="http://dl.javafx.com/1.3/dtfx.js"></script> <script src="http://javafxdemos.googlecode.com/hg/resource/SaveAsImage/1.3/SaveAsImage.js"></script>

For Applet mode, click on above image

For standalone mode

Try it out and let me know feedback

Thursday Jan 14, 2010

JavaFX - Printing


There were many queries related to saving and printing of JavaFX nodes. Users can capture the node as image following the approach outlined in one of previous blog and use ImageIO APIs to save the image to file. For printing, we can use 2D printing - java.awt.print.PrinterJob and java.awt.print.Printable. Implement print method in Printable interface and draw the image onto Graphics object. Another approach is to directly print the image using javax.print.PrintService.

Below sample demonstrates use of ImageIO and PrintService to print the Chart

<script src="http://dl.javafx.com/1.2/dtfx.js"></script> <script src="http://javafxdemos.googlecode.com/hg/resource/JavaFXPrint/JavaFXPrint.js"></script>


To launch click on above image or

The chart node is captured in BufferedImage. Refer to toBufferedImage method in Utils.fx. The image is then streamed to a ByteArrayOutputStream using ImageIO API. A PrintService instance which supports DocFlavor.INPUT_STREAM.PNG is obtained using lookupPrintServices method in PrintServicesLookup and print. Refer to print method in PrintUtils.java for more information.

Try it out and let me know feedback.. ..and once again wish you a
Happy New Year!


<script type="text/javascript">var dzone_style = '2';</script> <script language="javascript" src="http://javafxdemos.googlecode.com/hg/resource/JavaFXPrint/zoneit.js"></script>

Tuesday Jul 21, 2009

JavaFX - Save As Image


There was a question on forum related to saving of node as image. JavaFX sample - EffectsPlayground had this feature. It uses internal APIs, so its broken in JavaFX 1.2. Community has identified a solution. Thanks to Chris Jensen for pointing me to this.

If you are using internal APIs as mentioned in forum thread, you will have to update your code to use 1.3 internal APIs. Please refer to JavaFX [1.3] - Save As Image post for update related to JavaFX 1.3.

Since it uses internal APIs, it may again break in next release. May be most of users just want to save a set of nodes displayed on screen. In that case we may get the top level container and draw the contents on to an image. Yes, draw back is that it will draw all nodes, so we may have to selectively hide nodes before we save the image.

<script src="http://dl.javafx.com/1.2/dtfx.js"></script> <script src="/rakeshmenonp/resource/SaveAsImage/SaveAsImage.js"></script>

For Applet mode, click on above image

For standalone mode

First we get the instance of top level container which may be an Applet or Frame.

public function getContainer() : Container {

    var container : Container;

    if("{__PROFILE__}" == "browser") { // Applet
        container = FX.getArgument("javafx.applet"as Applet;
    else // Standalone
        var frames = Frame.getFrames();
        // We may improve this logic so as to find the
        // exact Stage (Frame) based on its title
        container = (frames[0as JFrame).getContentPane();
    }

    return container;
}

Now we can save the contents of the Container as Image

function save(container : Container, bounds : Bounds, file : File) {

    var bufferedImage = new BufferedImage(
        bounds.width, bounds.height, BufferedImage.TYPE_INT_ARGB);
    var graphics = bufferedImage.getGraphics();
    graphics.translate(-bounds.minX, -bounds.minY);
    container.paint(graphics);
    graphics.dispose();

    ImageIO.write(bufferedImage, "png", file);
}

Yes, it captures the entire scene. So user has to hide the nodes which are not required before saving as image. For this I have created two groups. One group will hold all nodes that needs to be captured. Other group contains nodes which are not required (such as Button). Before taking saving as image, hide the node which contains controls etc, so that they won't appear in saved image.

Try it out and let me know feedback


<script type="text/javascript">var dzone_url = "http://blogs.sun.com/rakeshmenonp/entry/javafx_save_as_image";</script> <script type="text/javascript">var dzone_style = '2';</script> <script language="javascript" src="http://widgets.dzone.com/widgets/zoneit.js"></script>

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