在 Flash 中,可以利用設定 rotation 屬性,使物件達到旋轉效果,但如果需要使物件隨著滑鼠
旋轉,就得使用 radians
to degrees
的公式幫我們算出目前的 degrees,並將求得值設
給物件的 rotation 屬性。
radians
to degrees 公式:
degrees = radians *
180
/Math.PI;
Flash 程式:
程式碼:
package
{
import flash.display.Sprite;
import flash.events.Event;
[SWF(width=300,height=300,backgroundColor="#000000")]
public class Main extends Sprite
{
private var angle:Number=0;
private var square:Sprite = new Sprite();
private var circle:Sprite = new Sprite();
public function Main():void
{
//畫圓
circle.graphics.beginFill(0x558FF0);
circle.graphics.drawCircle(0, 0, 100);
circle.x = 150;
circle.y = 150;
addChild(circle);
//畫指針
square.graphics.beginFill(0xFFCC00);
square.graphics.drawRect(-5, -5, 100, 10);
square.x = 150;
square.y = 150;
addChild(square);
addEventListener(Event.ENTER_FRAME,go);
}
private function go(evt:Event):void{
var x:Number = mouseX;
var y:Number = mouseY;
//求得轉動角度
angle = Math.atan2(y - square.y , x - square.x) * (180 / Math.PI);
//將求得值傳給指針 rotation 屬性
square.rotation = angle;
}
}
}
檔案下載:rotation.zip
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