text: 'use strict'
  
  function Cursor () {
    this.pos = { x: 0, y: 0 }
    this.translation = null
    this.operation = null
  
    this.translate = function (from = null, to = null, multi = false, copy = false, layer = false) {
      if ((from || to) && this.translation === null) { this.translation = { multi: multi, copy: copy, layer: layer } }
  
      if (from) { this.translation.from = from }
      if (to) { this.translation.to = to }
  
      if (!from && !to) {
        this.translation = null
      }
    }
  
    this.down = function (e) {
      this.pos = this.atEvent(e)
  
      // Translation
      if (dotgrid.tool.vertexAt(this.pos)) {
        this.translate(this.pos, this.pos, e.shiftKey, e.ctrlKey || e.metaKey, e.altKey)
      }
  
      dotgrid.renderer.update()
      dotgrid.interface.update()
      e.preventDefault()
    }
  
    this.last_pos = { x: 0, y: 0 }
  
    this.move = function (e) {
      this.pos = this.atEvent(e)
  
      // Translation
      if (this.translation) {
        this.translate(null, this.pos)
      }
  
      if (this.last_pos.x !== this.pos.x || this.last_pos.y !== this.pos.y) {
        dotgrid.renderer.update()
      }
  
      dotgrid.interface.update()
      e.preventDefault()
  
      this.last_pos = this.pos
    }
  
    this.up = function (e) {
      this.pos = this.atEvent(e)
  
      if (this.translation && !isEqual(this.translation.from, this.translation.to)) {
        if (this.translation.layer === true) { dotgrid.tool.translateLayer(this.translation.from, this.translation.to) } else if (this.translation.copy) { dotgrid.tool.translateCopy(this.translation.from, this.translation.to) } else if (this.translation.multi) { dotgrid.tool.translateMulti(this.translation.from, this.translation.to) } else { dotgrid.tool.translate(this.translation.from, this.translation.to) }
      } else if (e.target.id === 'guide') {
        dotgrid.tool.addVertex({ x: this.pos.x, y: this.pos.y })
        dotgrid.picker.stop()
      }
  
      this.translate()
  
      dotgrid.interface.update()
      dotgrid.renderer.update()
      e.preventDefault()
    }
  
    this.alt = function (e) {
      this.pos = this.atEvent(e)
  
      dotgrid.tool.removeSegmentsAt(this.pos)
      e.preventDefault()
  
      setTimeout(() => { dotgrid.tool.clear() }, 150)
    }
  
    // Position Mods
  
    this.atEvent = function (e) {
      return this.snapPos(this.relativePos({ x: e.clientX, y: e.clientY }))
    }
  
    this.relativePos = function (pos) {
      return {
        x: pos.x - dotgrid.renderer.el.offsetLeft,
        y: pos.y - dotgrid.renderer.el.offsetTop
      }
    }
  
    this.snapPos = function (pos) {
      return {
        x: clamp(step(pos.x, 15), 15, dotgrid.tool.settings.size.width - 15),
        y: clamp(step(pos.y, 15), 15, dotgrid.tool.settings.size.height - 15)
      }
    }
  
    function isEqual (a, b) { return a.x === b.x && a.y === b.y }
  }
  