Setting a mask type on an Ellipse in Flex Gumbo

The following example shows how you can set an Ellipse object’s mask type as a clip mask or alpha mask by setting the maskType property.

Full code after the jump.

To use the following code, you must have Flash Player 10 and a Flex Gumbo SDK installed in your Flex Builder 3. For more information on downloading and installing the Gumbo SDK into Flex Builder 3, see “Using the beta Gumbo SDK in Flex Builder 3″.

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/11/11/setting-a-mask-type-on-an-ellipse-in-flex-gumbo/ -->
<FxApplication xmlns="http://ns.adobe.com/mxml/2009">
    <layout>
        <BasicLayout />
    </layout>

    <Form>
        <FormItem label="maskType:">
            <ComboBox id="comboBox"
                    dataProvider="[clip,alpha]" />
        </FormItem>
        <FormItem label="mask alpha:"
                direction="horizontal">
            <HSlider id="slider"
                    minimum="0.0"
                    maximum="1.0"
                    value="1.0"
                    liveDragging="true" />
            <Label text="{slider.value.toFixed(1)}" />
        </FormItem>
    </Form>

    <VGroup horizontalCenter="0" bottom="10">
        <Ellipse id="ellipse"
                maskType="{comboBox.selectedItem}"
                width="400"
                height="200">
            <mask>
                <Group>
                    <Rect width="100" height="100">
                        <fill>
                            <SolidColor alpha="{slider.value}" />
                        </fill>
                    </Rect>
                </Group>
            </mask>
            <fill>
                <SolidColor color="#FF00FF" />
            </fill>
        </Ellipse>
    </VGroup>

</FxApplication>

View source is enabled in the following example.

This entry is based on a beta version of the Flex Gumbo 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 Gumbo SDK.