Проверять тут - http://sketch.paperjs.org/

paraquest-arrow-editor.js

var title = new PointText(new Point(200, 10));
title.content="click - установка стрелки, drug - перемещени, shift-drug - вращение"
var debug = new PointText(new Point(200, 50));
var currentArrow;

var raster = new Raster({
    source: "https://paraquest.ru/uploads/slide/image/20/2018-11-12_21_10_04-Улет_с_Аламнера3.png",
    position: view.center
});
var arrow_options = {
    segments: [[0,0], [35,0], [35, 7], [50,0], [35,-7], [35, 0]],
	strokeColor: 'red',
	fillColor: 'red',
    strokeWidth: 2,
    strokeCap: 'round',
};
var	arrowPath = new Path(arrow_options);

// Бокс предназначен для большей зона охвата мышкой
var boxPath = new Path.Rectangle([-5,-15], [55,30]);
boxPath.strokeColor='black';
boxPath.fillColor='black';
boxPath.opacity=0;

var path = new Group([arrowPath, boxPath]);

var definition = new SymbolDefinition(path);
var originalRotation = 45;
var lastRotation = originalRotation;
var items = 0
var firstPoint;

var placeArrow = function(point) {
  var i = definition.place();
  var savedRotation;
  i.onMouseDown = function(event) {
     savedRotation = i.rotation;
     firstPoint = event.point;
     i.selected = true;
  }
  i.onMouseUp = function(event) {
      i.selected = false;
  }
  i.onDoubleClick = function(event) { i.remove();  }
  i.onMouseDrag = function(event) {
      if (event.modifiers.shift) {
          var x = event.point.x - firstPoint.x;
          var y = event.point.y - firstPoint.y;
          var ab = 0 + y*100;
          var a = Math.sqrt(Math.pow(0,2) + Math.pow(100,2));
          var b = Math.sqrt(Math.pow(x,2) + Math.pow(y,2));

        var angle = Math.acos(ab/(a*b));
	     i.rotation =  180 / Math.PI * Math.atan2(y, x);
        lastRotation = i.rotation;
      } else {
        i.position = event.point;
      }
  }
  i.name = 'arrow';
  i.position = point;
  i.rotate(lastRotation);
  items +=1;
}

tool.onMouseDown = function(event) {
  if (!(event.item && event.item.name == 'arrow')) {
    placeArrow(event.point);
  }
}