Best way to convert event position to game position

[tguerin]

Hello guys,

I'm making a simple brick breaker for fun with flame + forge2d. I managed to get the platform to follow the mouse move on web but the way I did it seems too complicated. My platform is just a component that draw a rectangle (BouncerComponent), and when the cursor move I just update the position:

  final gameSize = Vector2(1920, 1080);

  @override
  void onMouseMove(PointerHoverInfo info) {
    target = info.eventPosition.game;
    final bouncerComponent = cameraWorld.firstChild<BouncerComponent>()!;
    // I only move along the x axis, -50 is just half the width of the platform
    bouncerComponent.position = Vector2(
      info.eventPosition.game.x / canvasSize.x * gameSize.x - 50,
      bouncerComponent.position.y,
    );
  }

I tried the screenToWorld but doesn't work. I also tried to use viewport and widget position from the cursor event but all values are the same. The only way I managed to get it work properly is to get a ratio of the cursor relative to the screen and multiply the game size.

Also I tested to draw directly from render method and it works without any conversion.

Am I missing something?

[spydon]

A simpler way to do this would be to use a MouseJoint, have you tried that?

There is a mouse joint example here: https://examples.flame-engine.org/#/flame_forge2d%2Fjoints_MouseJoint

[tguerin]

Thanks! I prefer this way.