创建配额行

Question

我需要一些帮助。 我正在尝试为度量工具创建配额行，但我做不到。我尝试了很多方法，什么也没做。

尽我所能执行我的代码。你能帮我吗？

var LEFT = 0;   var RIGHT = 2;

document.addEventListener（'contextmenu'，event => event.preventDefault（））;

window.onload = function（）{

var canvas = document.getElementById('canvas');
paper.setup(canvas);

var path, myPath, x, y;
var draw = false;

function drawLine(point) {
  path = new paper.Path();

  path.selected       = true;
  path.selectedColor  = '#F6B343';
  path.strokeColor    = '#F6B343';
  path.strokeWidth    = 0.75;

  path.moveTo(point);
  path.lineTo(point);

  draw = true;
}

function quotas(x, y) {
  myPath = new paper.Path();
  myPath.strokeColor = 'black';
  myPath.selected = true;

  myPath.add(new paper.Point(x, y));
  myPath.add(new paper.Point(10, y));

  myPath.rotation = 90;
}

var tool = new paper.Tool();

tool.onMouseDown = function(event) {

  if (event.event.button == LEFT) {
    if (!draw) {
      drawLine(event.point);
      quotas(event.point.x, event.point.y);
    } else {
      draw = false;
    }
  }

  if (event.event.button == RIGHT) {
    path.selected = !path.selected;
  }
}

tool.onMouseMove = function(event) {
  if (draw) {
    path.lastSegment.point = event.point;
  }
}

}