3d-view/test/test.js

3D camera view controller

'use strict'

var tape = require('tape')
var createOrbit = require('../view')
var lookAt = require('gl-mat4/lookAt')

var modes = [ 'orbit', 'turntable', 'matrix' ]

function arrayApproxEquals(a, b) {
  for(var i=0; i<a.length; ++i) {
    if(!(Math.abs(a[i] - b[i]) < 1e-4)) {
      return false
    }
  }
  return true
}

function matrixApproxEquals(a, b) {
  var x = a[15]
  var y = b[15]
  for(var i=0; i<15; ++i) {
    if(!(Math.abs(a[i] * y - b[i] * x) < 1e-4)) {
      return false
    }
  }
  return true
}

tape('orbit camera', function(t) {

  for(var i=0; i<100; ++i) {
    var center = [Math.random()-0.5, Math.random()-0.5, Math.random()-0.5]
    var eye = [Math.random()-0.5, Math.random()-0.5, Math.random()-0.5]
    var up = [Math.random()-0.5, Math.random()-0.5, Math.random()-0.5]

    var mat = lookAt([], eye, center, up)
    var smat = mat[15]

    modes.forEach(function(initMode) {
      var controller = createOrbit()
      controller.setMode(initMode)
      controller.lookAt(1, eye, center, up)

      modes.forEach(function(curMode) {
        controller.setMode(curMode)
        controller.recalcMatrix(10)

        var orbitMat = controller.computedMatrix
        t.ok(matrixApproxEquals(mat, orbitMat), 'compare mat: ' + mat + '   :    ' + orbitMat + '(initMode=' + initMode + ',curMode=' + curMode + ')')

        var oeye = controller.computedEye
        t.ok(arrayApproxEquals(eye, oeye), 'compare eye: '  + eye + ':' + oeye)

        if(curMode === 'matrix') {
          return
        }

        var ocenter = controller.computedCenter
        t.ok(arrayApproxEquals(center, ocenter), 'compare center: ' + center + ':' + ocenter)

        var dist = 0.0
        for(var j=0; j<3; ++j) {
          dist += Math.pow(eye[j] - center[j], 2)
        }
        dist = Math.sqrt(dist)
        t.ok(Math.abs(dist - Math.exp(controller.computedRadius[0])) < 1e-4, 'distance:' + controller.computedRadius + " expect " + dist)
      })
    })
  }

  for(var i=0; i<100; ++i) {
    var center = [Math.random()-0.5, Math.random()-0.5, Math.random()-0.5]
    var eye = [Math.random()-0.5, Math.random()-0.5, Math.random()-0.5]
    var up = [Math.random()-0.5, Math.random()-0.5, Math.random()-0.5]

    var mat = lookAt([], eye, center, up)

    modes.forEach(function(initMode) {
      var controller = createOrbit()

      controller.setMode(initMode)
      controller.setMatrix(1, mat)
      controller.recalcMatrix(10)

      modes.forEach(function(curMode) {
        controller.setMode(curMode)

        controller.recalcMatrix(10)

        var orbitMat = controller.computedMatrix
        t.ok(matrixApproxEquals(mat, orbitMat), 'compare mat: ' + mat + '   :    ' + orbitMat)

        var oeye = controller.computedEye
        t.ok(arrayApproxEquals(eye, oeye), 'compare eye: '  + eye + ':' + oeye)
      })
    })
  }

  t.end()
})