Main.hx

package;

import flash.display.Bitmap;
import flash.display.Sprite;
import flash.events.Event;
import flash.Lib;
import openfl.Assets;

class Main extends Sprite {
  private var image: Bitmap;
  private var previousTimeMilliseconds = 0;
  private var maxDeltaTimeSeconds = 1.0 / 30.0;
  
  public function new () {
    super();
    
    var imageBitmapData = Assets.getBitmapData("img/EasyToUse.png");
    
    image = new Bitmap(imageBitmapData);
    
    addChild(image);
    
    addEventListener (Event.ENTER_FRAME, this_onEnterFrame);
  }
  
  private function this_onEnterFrame (event:Event):Void {
    var currentTimeMilliseconds = Lib.getTimer();
    var deltaTimeMilliseconds = (currentTimeMilliseconds -
                                 previousTimeMilliseconds);
    var deltaTimeSeconds = deltaTimeMilliseconds / 1000;
    
    if (deltaTimeSeconds > maxDeltaTimeSeconds) {
      deltaTimeSeconds = maxDeltaTimeSeconds;
    }
    
    var speedPixelsPerSecond = 40.0;
    var dx = speedPixelsPerSecond * deltaTimeSeconds;
    
    image.x += dx;
    
    previousTimeMilliseconds = currentTimeMilliseconds;
    
    trace(deltaTimeSeconds);
  }
}