objectFit static method

void objectFit(GDisplayObject object, { BoxFit fit = BoxFit.cover, double? objW, double? objH, required double canvasW, required double canvasH, bool reposition = false, })

Resizes and positions object inside a container defined by canvasW and canvasH. If objW and objH are provided, they should be the original size of the asset. The fit parameter works similar to BoxFit in Flutter. If reposition is true, the object will be centered in the container after resizing.

Implementation

static void objectFit(
  GDisplayObject object, {
  BoxFit fit = BoxFit.cover,
  double? objW,
  double? objH,
  required double canvasW,
  required double canvasH,
  bool reposition = false,
}) {
  if (objW == null || objH == null) {
    /// calculate real objects bounds.
    if (object is GBitmap) {
      objW ??= object.texture!.width;
      objH ??= object.texture!.height;
    } else {
      final bounds = object.bounds!;
      objW ??= bounds.width;
      objH ??= bounds.height;
    }
  }
  var r1 = objW! / objH!;
  var r2 = canvasW / canvasH;
  // Determine resize behavior based on fit parameter
  if (fit == BoxFit.scaleDown) {
    fit = objW > canvasW || objH > canvasH ? BoxFit.contain : BoxFit.none;
  }

  if (fit == BoxFit.cover) {
    if (r2 > r1) {
      object.width = canvasW;
      object.scaleY = object.scaleX;
    } else {
      object.height = canvasH;
      object.scaleX = object.scaleY;
    }
  } else if (fit == BoxFit.contain) {
    if (r1 > r2) {
      object.width = canvasW;
      object.scaleY = object.scaleX;
    } else {
      object.height = canvasH;
      object.scaleX = object.scaleY;
    }
  } else if (fit == BoxFit.fill) {
    object.width = canvasW;
    object.height = canvasH;
  } else if (fit == BoxFit.none) {
    object.width = objW;
    object.height = objH;
  } else if (fit == BoxFit.fitHeight) {
    object.height = canvasH;
    object.scaleX = object.scaleY;
  } else if (fit == BoxFit.fitWidth) {
    object.width = canvasW;
    object.scaleY = object.scaleX;
  }

  // Reposition object if requested
  if (reposition) {
    if (object.pivotX == 0) {
      object.x = (canvasW - object.width) / 2;
      object.y = (canvasH - object.height) / 2;
    } else {
      object.x = canvasW / 2;
      object.y = canvasH / 2;
    }
  }
}