3d-view/view.js

3D camera view controller

'use strict'

module.exports = createViewController

var createTurntable = require('turntable-camera-controller')
var createOrbit     = require('orbit-camera-controller')
var createMatrix    = require('matrix-camera-controller')

function ViewController(controllers, mode) {
  this._controllerNames = Object.keys(controllers)
  this._controllerList = this._controllerNames.map(function(n) {
    return controllers[n]
  })
  this._mode   = mode
  this._active = controllers[mode]
  if(!this._active) {
    this._mode   = 'turntable'
    this._active = controllers.turntable
  }
  this.modes = this._controllerNames
  this.computedMatrix = this._active.computedMatrix
  this.computedEye    = this._active.computedEye
  this.computedUp     = this._active.computedUp
  this.computedCenter = this._active.computedCenter
  this.computedRadius = this._active.computedRadius
}

var proto = ViewController.prototype

proto.flush = function(a0) {
  var cc = this._controllerList
  for (var i = 0; i < cc.length; ++i) {
    cc[i].flush(a0)
  }
}
proto.idle = function(a0) {
  var cc = this._controllerList
  for (var i = 0; i < cc.length; ++i) {
    cc[i].idle(a0)
  }
}
proto.lookAt = function(a0, a1, a2, a3) {
  var cc = this._controllerList
  for (var i = 0; i < cc.length; ++i) {
    cc[i].lookAt(a0, a1, a2, a3)
  }
}
proto.rotate = function(a0, a1, a2, a3) {
  var cc = this._controllerList
  for (var i = 0; i < cc.length; ++i) {
    cc[i].rotate(a0, a1, a2, a3)
  }
}
proto.pan = function(a0, a1, a2, a3) {
  var cc = this._controllerList
  for (var i = 0; i < cc.length; ++i) {
    cc[i].pan(a0, a1, a2, a3)
  }
}
proto.translate = function(a0, a1, a2, a3) {
  var cc = this._controllerList
  for (var i = 0; i < cc.length; ++i) {
    cc[i].translate(a0, a1, a2, a3)
  }
}
proto.setMatrix = function(a0, a1) {
  var cc = this._controllerList
  for (var i = 0; i < cc.length; ++i) {
    cc[i].setMatrix(a0, a1)
  }
}
proto.setDistanceLimits = function(a0, a1) {
  var cc = this._controllerList
  for (var i = 0; i < cc.length; ++i) {
    cc[i].setDistanceLimits(a0, a1)
  }
}
proto.setDistance = function(a0, a1) {
  var cc = this._controllerList
  for (var i = 0; i < cc.length; ++i) {
    cc[i].setDistance(a0, a1)
  }
}

proto.recalcMatrix = function(t) {
  this._active.recalcMatrix(t)
}

proto.getDistance = function(t) {
  return this._active.getDistance(t)
}
proto.getDistanceLimits = function(out) {
  return this._active.getDistanceLimits(out)
}

proto.lastT = function() {
  return this._active.lastT()
}

proto.setMode = function(mode) {
  if(mode === this._mode) {
    return
  }
  var idx = this._controllerNames.indexOf(mode)
  if(idx < 0) {
    return
  }
  var prev  = this._active
  var next  = this._controllerList[idx]
  var lastT = Math.max(prev.lastT(), next.lastT())

  prev.recalcMatrix(lastT)
  next.setMatrix(lastT, prev.computedMatrix)

  this._active = next
  this._mode   = mode

  //Update matrix properties
  this.computedMatrix = this._active.computedMatrix
  this.computedEye    = this._active.computedEye
  this.computedUp     = this._active.computedUp
  this.computedCenter = this._active.computedCenter
  this.computedRadius = this._active.computedRadius
}

proto.getMode = function() {
  return this._mode
}

function createViewController(options) {
  options = options || {}

  var eye       = options.eye    || [0,0,1]
  var center    = options.center || [0,0,0]
  var up        = options.up     || [0,1,0]
  var limits    = options.distanceLimits || [0, Infinity]
  var mode      = options.mode   || 'turntable'

  var turntable = createTurntable()
  var orbit     = createOrbit()
  var matrix    = createMatrix()

  turntable.setDistanceLimits(limits[0], limits[1])
  turntable.lookAt(0, eye, center, up)
  orbit.setDistanceLimits(limits[0], limits[1])
  orbit.lookAt(0, eye, center, up)
  matrix.setDistanceLimits(limits[0], limits[1])
  matrix.lookAt(0, eye, center, up)

  return new ViewController({
    turntable: turntable,
    orbit: orbit,
    matrix: matrix
  }, mode)
}