Fading two images using the CrossFade effect in Flex 4

By On September 21, 2009 · 7 Comments

The following example shows how you can cross fade two bitmap images using the CrossFade effect in Flex 4.

Full code after the jump.

The following example(s) require Flash Player 10 and the Adobe Flex 4 SDK. To download the Adobe Flash Builder 4 trial, see http://www.adobe.com/products/flex/. To download the latest nightly build of the Flex 4 SDK, see http://opensource.adobe.com/wiki/display/flexsdk/Download+Flex+4.
For more information on getting started with Flex 4 and Flash Builder 4, see the official Adobe Flex Team blog.

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/09/21/fading-two-images-using-the-crossfade-effect-in-flex-4/ -->
<s:Application name="Spark_CrossFade_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/halo">
    <s:controlBarContent>
        <mx:Button id="btn"
                label="Play CrossFade effect"
                click="button1_click(event);" />
    </s:controlBarContent>
 
    <fx:Script>
        <![CDATA[
            [Embed("assets/fl_player_appicon.jpg")]
            private const FlashPlayerIcon:Class;
 
            [Embed("assets/fx_appicon.jpg")]
            private const FlexPlayerIcon:Class;
 
            protected function button1_click(evt:MouseEvent):void {
                xFade.stop();
                xFade.bitmapFrom = new FlexPlayerIcon().bitmapData;
                xFade.bitmapTo = new FlashPlayerIcon().bitmapData;
                xFade.play();
            }
        ]]>
    </fx:Script>
 
    <fx:Declarations>
        <s:CrossFade id="xFade" target="{logo}" duration="3000" />
    </fx:Declarations>
 
    <s:VGroup horizontalCenter="0" verticalCenter="0">
        <mx:Image id="logo" source="{FlexPlayerIcon}" />
    </s:VGroup>
 
</s:Application>

This entry is based on a beta version of the Flex 4 SDK and therefore is very likely to change as development of the Flex SDK continues. The API can (and will) change causing examples to possibly not compile in newer versions of the Flex 4 SDK.

 
Tagged with: • • • •
 
About The Author

Peter deHaan

Peter deHaan currently works for Adobe on the Flex SDK QA team. While not working on Flex, Flash, and ColdFusion applications, Peter enjoys making up bios and writing in 3rd person. Peter's rarely updated blog can be found at blogs.adobe.com/pdehaan/, actionscriptexamples.com, airexamples.com, and coldfusionexamples.com.

Visit Authors Website →

  • Add Widgets (Content Sidebar)

    This is your Content Sidebar. Edit this content that appears here in the widgets panel by adding or removing widgets in the Content Sidebar area.

Share
Facebook Twitter

7 Responses to Fading two images using the CrossFade effect in Flex 4

  1. bobby says:
    September 23, 2009 at 10:59 am

    I replaces the last lines with the following lines so that I do not want to jump to the initial image after end of the effect, but this is not working can any body help whats the problem is

  2. bobby says:
    September 23, 2009 at 11:06 am 
    <mx:Image id="logo" initialize="logo.source='{FlashPlayerIcon}'" />
  3. Dave says:
    April 18, 2010 at 12:12 am

    I am seeing the jump to the initial image that bobby is talking about. Relevant code:

    if (i == timer.repeatCount) {
    clazz = resourceManager.getClass(‘assets’, ‘dash_article_7′);
    bitmapFrom = new clazz().bitmapData;
    clazz = resourceManager.getClass(‘assets’, ‘dash_article_1′);
    bitmapTo = new clazz().bitmapData;
    dash_numbers.selectedIndex = 0;

    } else {
    clazz = resourceManager.getClass(‘assets’, ‘dash_article_’+i);
    bitmapFrom = new clazz().bitmapData;
    clazz = resourceManager.getClass(‘assets’, ‘dash_article_’+(i+1))
    bitmapTo = new clazz().bitmapData;

    }

    xFade.stop();
    xFade.bitmapFrom = bitmapFrom;
    xFade.bitmapTo = bitmapTo;
    xFade.play();

  4. Dave says:
    April 18, 2010 at 12:14 am

    There should be a <Declarations> block containing my CrossFade. The target of the CrossFade is an mx:Image that didnt show up either.

  5. francescop says:
    September 20, 2010 at 5:13 am

    just stick your BitmapImage with second term of transition:
    xFade.stop();
    xFade.bitmapFrom = new FlexPlayerIcon().bitmapData;
    xFade.bitmapTo = new FlashPlayerIcon().bitmapData;
    xFade.play();
    logo.source = new FlashPlayerIcon().bitmapData;

  6. Dean says:
    January 20, 2011 at 11:41 am

    put an ‘effectEnd=’function” on the crossfade that sets your image source to the 2nd image

  7. Mike Bronner says:
    January 22, 2011 at 2:12 pm

    How do you crossfade scaled images? I want to crossfade a scaled background-image, but the fading occurs with non-scaled images, and once the fade is done, snaps to scale.

    Any ideas?