[Study] AS 3.0 Animation ch08_11

by nmrtmnr 08 Jul 2015

Embed

/**
 * Copyright nmrtmnr ( http://wonderfl.net/user/nmrtmnr )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/1VqM
 */

  package {
    import flash.display.Sprite;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import flash.text.TextField;
    import flash.events.Event;
    import flash.events.MouseEvent;

    public class MultiSpring extends Sprite {
      private var ball:Ball;
      private var handles:Array;
      private var spring:Number = 0.1;
      private var friction:Number = 0.8;
      private var numHandles:Number = 4;

      public function MultiSpring() {
        init();

        var textField:TextField = new TextField();
        addChild(textField);
        textField.x = 10;
        textField.y = 10;
        textField.width = stage.stageWidth;
        textField.height = 20;

        textField.text = '複数の目標へのバネ運動 (黒い点をドラッグして動かす)';
      }

      private function init():void {
        ball = new Ball(20, 0x00ff00);
        addChild(ball);

        handles = new Array();
        for(var i:uint = 0; i < numHandles; i++) {
          var handle:Ball = new Ball(10, 0x343434);
          handle.x = Math.random() * stage.stageWidth;
          handle.y = Math.random() * stage.stageHeight;
          handle.addEventListener(MouseEvent.MOUSE_DOWN, onPress);
          addChild(handle);
          handles.push(handle);
        }

        addEventListener(Event.ENTER_FRAME, onEnterFrame);
        addEventListener(MouseEvent.MOUSE_UP, onRelease);
      }

      public function onEnterFrame(event:Event):void {
        for(var i:uint = 0; i < numHandles; i++) {
          var handle:Ball = handles[i] as Ball;
          var dx:Number = handle.x - ball.x;
          var dy:Number = handle.y - ball.y;
          ball.vx += dx * spring;
          ball.vy += dy * spring;
        }

        ball.vx *= friction;
        ball.vy *= friction;

        ball.x += ball.vx;
        ball.y += ball.vy;

        graphics.clear();
        graphics.lineStyle(1);
        for(i = 0; i < numHandles; i++) {
          graphics.moveTo(ball.x, ball.y);
          graphics.lineTo(handles[i].x, handles[i].y);
        }
      }

      private function onPress(event:MouseEvent):void {
        event.target.startDrag();
      }

      private function onRelease(event:MouseEvent):void {
        stopDrag();
      }
    }
  }

  import flash.display.Sprite;

  // Arrowクラス
  class Arrow extends Sprite {
    public function Arrow() {
      init();
    }

    private function init():void {
      graphics.lineStyle(1, 0, 1);
      graphics.beginFill(0xffff00);
      graphics.moveTo(-50, -25);
      graphics.lineTo(0, -25);
      graphics.lineTo(0, -50);
      graphics.lineTo(50, 0);
      graphics.lineTo(0, 50);
      graphics.lineTo(0, 25);
      graphics.lineTo(-50, 25);
      graphics.lineTo(-50, -25);
      graphics.endFill();
    }
  }
  // ↑↑↑

  // Ballクラス
  class Ball extends Sprite {
    public var radius:Number;
    public var color:uint;
    public var vx:Number = 0;
    public var vy:Number = 0;

    public function Ball(radius:Number = 40, color:uint=0xff0000) {
      this.radius = radius;
      this.color = color;
      init();
    }

    private function init():void {
      graphics.beginFill(color);
      graphics.drawCircle(0, 0, radius);
      graphics.endFill();
    }
  }
  // ↑↑↑