Flex坐标系统及转换_技术辅导

这些坐标系的点是可以转换的，并且有相应的方法，看来adobe想得挺周到。我们一个一个的说一下：

这个坐标系的原点在整个flash舞台的左上角，MouseEvent实例的stageX,stageY就是这个坐标系中的值。

坐标原点是相对的组件的左上角，MouseEvent中的localX,localY就是相对这个坐标系说的。

这个东西比较抽象了UIComponent类实例的contentMouseX 和 contentMouseY 就是了，这个主要针对有滚动条的组件说的，有滚动条了，内容肯定不少，内容所占的区域的坐标就是这个坐标系了。

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
backgroundColor="white">
<mx:Script>
<!--[CDATA[
import mx.controls.Alert;
// Handle the mouseDown event generated
// by clicking in the application.
private function handleMouseDown(event:MouseEvent):void {
// Convert the mouse position to global coordinates.
// The localX and localY properties of the mouse event contain
// the coordinates at which the event occurred relative to the
// event target, typically one of the
// colored internal Canvas controls.
// A production version of this example could use the stageX
// and stageY properties, which use the global coordinates,
// and avoid this step.
// This example uses the localX and localY properties only to
// illustrate conversion between different frames of reference.
var pt:Point = new Point(event.localX, event.localY);
pt = event.target.localToGlobal(pt);
// Convert the global coordinates to the content coordinates
// inside the outer c1 Canvas control.
pt = c1.globalToContent(pt);
// Figure out which quadrant was clicked.
var whichColor:String = "border area";
if (pt.x < 150) {
if (pt.y < 150)
whichColor = "red";
else
whichColor = "blue";
}
else {
if (pt.y < 150)
whichColor = "green";
else
whichColor = "magenta";
}
Alert.show("You clicked on the " + whichColor);
}
]]-->
</mx:Script>
<mx:Canvas id="c1"
borderStyle="none"
width="300" height="300"
mouseDown="handleMouseDown(event);">
<mx:Canvas
width="150" height="150"
x="0" y="0"
backgroundColor="red">
<mx:Button label="I'm in Red"/>
</mx:Canvas>
<mx:Canvas
width="150" height="150"
x="150" y="0"
backgroundColor="green">
<mx:Button label="I'm in Green"/>
</mx:Canvas>
<mx:Canvas
width="150" height="150"
x="0" y="150"
backgroundColor="blue">
<mx:Button label="I'm in Blue"/>
</mx:Canvas>
<mx:Canvas
width="150" height="150"
x="150" y="150"
backgroundColor="magenta">
<mx:Button label="I'm in Magenta"/>
</mx:Canvas>
</mx:Canvas>
</mx:Application>

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