    paper.pageToLocalRect(rect)

Transform the rectangle `rect` defined in the page coordinate system to the local coordinate system.

    var x, y;
    paper.on('blank:pointerdown', function(evt) {
      x = evt.pageX;
      y = evt.pageY;
    });
    paper.on('blank:pointerup', function(evt) {
      var pageRect = g.Rect(x, y, evt.pageX - x, evt.pageY - y).normalize();
      var localRect1 = this.pageToLocalRect(pageRect);
      // alternative method signature
      var localRect2 = this.pageToLocalRect(x, y, evt.pageX - x, evt.pageY - y).normalize();
      // Move and resize the element to cover the area, that the user just selected.
      element.position(localRect1.x, localRect1.y);
      element.resize(localRect1.width, localRect1.height);
    });