x1,y1とx2,y2の距離を求める
dx = x2 – x1;
dy = y2 – y1;
dist = Math.sprt(dx * dx + dy * dy);
[sourcecode language=”java”]
package
{
import flash.display.Sprite;
import flash.events.MouseEvent;
import flash.text.TextField;
public class MouseDistance extends Sprite {
private var sprite1:Sprite;
private var textField:TextField;
public function MouseDistance() {
init();
}
private function init():void {
sprite1 = new Sprite();
addChild(sprite1);
sprite1.graphics.beginFill(0x000000);
sprite1.graphics.drawRect(-2, -2, 4, 4);
sprite1.graphics.endFill();
sprite1.x = stage.stageWidth / 2;
sprite1.y = stage.stageHeight / 2;
textField = new TextField();
addChild(textField);
stage.addEventListener(MouseEvent.MOUSE_MOVE, onMouseMove);
}
public function onMouseMove(event:MouseEvent):void {
graphics.clear();
graphics.lineStyle(1, 0, 1);
graphics.moveTo(sprite1.x, sprite1.y);
graphics.lineTo(mouseX, mouseY);
var dx:Number = sprite1.x – mouseX;
var dy:Number = sprite1.y – mouseY;
var dist:Number = Math.sqrt(dx * dx + dy * dy);
textField.text = dist.toString();
}
}
}
[/sourcecode]
上のはステージの中心にSpriteをおいて、それとマウスの距離を計算