How to set a fixed point on one of the endpoints of a curve, that is fixed while dragging so the shape of the curve changes? (-item1.y is the y-coordinate of the Item-id; this is a fixed number with normal rectangles)

Qt Code: 
  1. Path {
  2.         id: bendline
  3.         startX: -146; startY: -12
  4.         PathCurve { x: -138; y: -17 }
  5.         PathCurve { x: -132; y: -25 }
  6.         PathCurve { x: -130; y: -item1.y+365 }
  7.         property color mycolor: "black"
  8.     }
  9.  
  10. MouseArea {
  11.         anchors.fill: parent
  12.         onPositionChanged: {
  13.             if (mouse.buttons & Qt.LeftButton) {
  14.                 bendline.x -= (x - mouse.x); bendline.y = -item1.y+365;
  15.             }
  16.         }
  17.  
  18. PathView {
  19.             id: bendView;
  20.             x: 10
  21.             y: 20
  22.             model: { item1.y >= 387 && item1.y < 459 ? 300 : 0 }
  23.             path: bendline
  24.             delegate: Rectangle {
  25.                 id: dot;
  26.                 width: 1; height: 1;
  27.                 color: bendline.mycolor
  28.             }
  29.         }
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