An one-button way to control the player coming from the past

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I always loved one-button games. First, they can be played with just one button. Second, in the mobile game era, it’s easy to port an on-button concept to an one-tap concept.

Almost five years ago (ages!!) I showed a strange way to move the player with Flash made with AS2, and I find it interesting to port it to AS3, to be ported again in other languages.

Since you can find the complete theory in the original post, I will just post the AS3 source code:

package {
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.text.TextField;
	public class Main extends Sprite {
		private var ball:Ball=new Ball();
		private var directionArrow:DirectionArrow=new DirectionArrow();
		private var powerText:TextField = new TextField();
		private var rotate:Boolean=true;
		private var power:Number=0;
		private var xSpeed:Number=0;
		private var ySpeed:Number=0;
		private var friction:Number=0.975;
		private var rotationSpeed:Number=5;
		public function Main() {
			addChild(ball);
			ball.x=320;
			ball.y=240;
			ball.addChild(directionArrow);
			powerText.textColor = 0xffffff;
			powerText.y=-10;
			powerText.x=-5;
			powerText.visible=false;
			ball.addChild(powerText);
			addEventListener(Event.ENTER_FRAME,update);
			stage.addEventListener(MouseEvent.MOUSE_DOWN,prepareLaunch);
			stage.addEventListener(MouseEvent.MOUSE_UP,launch);
		}
		private function prepareLaunch(e:MouseEvent):void {
			powerText.visible=true
			rotate=false;
		}
		private function launch(e:MouseEvent):void {
			if (! rotate) {
				powerText.visible=false;
				rotate=true;
				xSpeed+=power*Math.cos((directionArrow.rotation-90)*0.0174532925)/10;
				ySpeed+=power*Math.sin((directionArrow.rotation-90)*0.0174532925)/10;
				power=0;
				rotationSpeed*=-1;
			}
		}
		private function update(e:Event):void {
			if (rotate) {
				directionArrow.rotation+=rotationSpeed;
			}
			else {
				power++;
				power=Math.min(power,50);
				powerText.text=power.toString();
			}
			ball.x+=xSpeed;
			ball.y+=ySpeed;
			xSpeed*=friction;
			ySpeed*=friction;
		}
	}

}

and this is the result:

Press and keep the mouse pressed to move the ball with a given direction and speed

During next days I’ll port this prototype into the most famous formats.

Download the source code

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