code: function drawLinearTick(context, x1, y1, x2, y2) {
      context.beginPath();
  
      context.moveTo(x1, y1);
      context.lineTo(x2, y2);
      context.stroke();
  
      context.closePath();
      context.save();
  }
docs: /* istanbul ignore next: private, not testable 
  Draws a tick line on a linear gauge
  
  @param {Canvas2DContext} context
  @param x1
  @param y1
  @param x2
  @param y2