// forked from uranodai's interactive circle /** * インタラクションのサンプル * つかんで動かす * @author Default * @version 0.1 */ package { import flash.display.Sprite; import flash.events.Event; import flash.events.MouseEvent; [SWF(width="400", height="400", frameRate="30", backgroundColor="#FFFFFF")] public class Study1 extends Sprite{ private var FRICTION:Number = 0.98; //スピードの減衰率 private var GRAVITY:Number = 1; //重力 private var RADIUS:Number = 40; //半径 private var posx:Number; //位置 private var posy:Number; private var vx:Number; //速度 private var vy:Number; private var pmouseX:Number = 0; //前フレームのマウスポインタの座標 private var pmouseY:Number = 0; private var onMouse:Boolean = false; //ボールとマウスポインタの接触フラグ private var onDrag:Boolean = false; //ボールのドラッグ中フラグ public function Study1() { //位置とスピードの初期化 posx = stage.stageWidth/2; posy = stage.stageHeight/2; vx = 0; vy = 0; //イベントリスナの追加 addEventListener(Event.ENTER_FRAME, draw); stage.addEventListener(MouseEvent.MOUSE_DOWN, function(e:MouseEvent):void { if(onMouse){ pmouseX = mouseX; pmouseY = mouseY; onDrag = true; } }); stage.addEventListener(MouseEvent.MOUSE_UP, function(e:MouseEvent):void { onDrag = false; }); } private function draw(e:Event):void { graphics.clear(); //位置の計算 if(onDrag){ posx = mouseX; posy = mouseY; vx = mouseX - pmouseX; vy = mouseY - pmouseY; pmouseX = mouseX; pmouseY = mouseY; }else{ vx = vx*FRICTION; vy = vy*FRICTION+GRAVITY; posx = posx+vx; posy = posy+vy; bounce(); //跳ね返り判定 } checkOnMouse(); //ボールとマウスが触れているか判定 //描画 graphics.lineStyle(0,0xFF0066); graphics.drawCircle(posx, posy, RADIUS); graphics.endFill(); } //ボールとマウスが触れているか判定 private function checkOnMouse():void { if(Math.sqrt(Math.pow(mouseX-posx,2)+Math.pow(mouseY-posy,2))<RADIUS){ onMouse = true; graphics.beginFill(0xFF0066,0.3); }else{ onMouse = false; graphics.beginFill(0xFFFFFF,0.3); } } //跳ね返り判定 private function bounce():void{ var bounceMinX:Number = RADIUS; var bounceMaxX:Number = stage.stageWidth-RADIUS; var bounceMinY:Number = RADIUS; var bounceMaxY:Number = stage.stageHeight-RADIUS; if(posx < bounceMinX || posx>bounceMaxX){ vx = -vx*FRICTION; if(Math.abs(vx)<1)vx = 0; if(posx<bounceMinX){ posx = bounceMinX -(posx-bounceMinX); } if(posx > bounceMaxX){ posx = bounceMaxX -(posx-bounceMaxX); } } if(posy < bounceMinY || posy>bounceMaxY){ vy = -vy*FRICTION; if(Math.abs(vy)<1)vy = 0; if(posy<bounceMinY){ posy = bounceMinY -(posy-bounceMinY); } if(posy > bounceMaxY){ if(bounceMaxY-posy<1){ posy = bounceMaxY; }else{ posy = bounceMaxY-(posy-bounceMaxY); } } } } } }