Hi all,
I have been working recently with TileLayerOverlays. The idea is to
represent thematic mapping with different colors on countries. I
needed it to be fast so I am using TileLayers. But I wanted to change
the mouse cursor when hovering over the countries.
I thought it could be interesting to share how I did it. Baiscally I
have a TileLayer (that extends from TileLayerBase) that add custom
Tiles (Sprites), like some examples on the demo. the custom tile then
adds an event listener to mouse movement. In every movement I check
the color of the pixel behind the mouse and if it is distintct to
white then it means I should activate the mouse cursor. The mouse
cursor is set by setting the tile buttonMode property to true.
Here is the class in case someone needs it.
----------------
package com.vizzuality.map.overlays
{
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Loader;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.IOErrorEvent;
import flash.events.MouseEvent;
public class CustomTile extends Sprite
{
public var loader:Loader;
private var bm:Bitmap;
private var bmd:BitmapData;
public function CustomTile()
{
loader = new Loader();
loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR,
ioErrorHandler,false,0,true);
loader.contentLoaderInfo.addEventListener(Event.COMPLETE,
loaded,false,0,true);
this.addEventListener(MouseEvent.MOUSE_MOVE,onMouseOver);
}
private function ioErrorHandler(event:IOErrorEvent):void {
event.currentTarget.removeEventListener(IOErrorEvent.IO_ERROR,
ioErrorHandler);
}
private function onMouseOver(evt:MouseEvent):void {
bm = this.loader.content as Bitmap;
bmd = new BitmapData(256, 256);
bmd.draw(bm.bitmapData);
var color:int = bmd.getPixel(evt.localX, evt.localY);
if (color != 0xFFFFFF) {
this.buttonMode=true;
} else {
this.buttonMode=false;
}
}
private function loaded(event:Event):void {
event.currentTarget.removeEventListener(Event.COMPLETE,
loaded)
addChild(loader);
}
}
}
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