1 | /** |
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2 | * @author Eberhard Graether / http://egraether.com/ |
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3 | */ |
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4 | |
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5 | THREE.TrackballControls = function ( object, domElement ) { |
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6 | |
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7 | var _this = this; |
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8 | var STATE = { NONE: -1, ROTATE: 0, ZOOM: 1, PAN: 2, TOUCH_ROTATE: 3, TOUCH_ZOOM: 4, TOUCH_PAN: 5 }; |
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9 | |
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10 | this.object = object; |
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11 | this.domElement = ( domElement !== undefined ) ? domElement : document; |
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12 | |
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13 | // API |
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14 | |
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15 | this.enabled = true; |
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16 | |
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17 | this.screen = { left: 0, top: 0, width: 0, height: 0 }; |
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18 | |
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19 | this.rotateSpeed = 1.0; |
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20 | this.zoomSpeed = 1.2; |
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21 | this.panSpeed = 0.3; |
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22 | |
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23 | this.noRotate = false; |
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24 | this.noZoom = false; |
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25 | this.noPan = false; |
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26 | this.noRoll = false; |
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27 | |
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28 | this.staticMoving = false; |
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29 | this.dynamicDampingFactor = 0.2; |
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30 | |
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31 | this.minDistance = 0; |
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32 | this.maxDistance = Infinity; |
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33 | |
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34 | this.keys = [ 65 /*A*/, 83 /*S*/, 68 /*D*/ ]; |
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35 | |
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36 | // internals |
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37 | |
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38 | this.target = new THREE.Vector3(); |
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39 | |
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40 | var lastPosition = new THREE.Vector3(); |
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41 | |
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42 | var _state = STATE.NONE, |
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43 | _prevState = STATE.NONE, |
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44 | |
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45 | _eye = new THREE.Vector3(), |
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46 | |
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47 | _rotateStart = new THREE.Vector3(), |
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48 | _rotateEnd = new THREE.Vector3(), |
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49 | |
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50 | _zoomStart = new THREE.Vector2(), |
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51 | _zoomEnd = new THREE.Vector2(), |
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52 | |
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53 | _touchZoomDistanceStart = 0, |
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54 | _touchZoomDistanceEnd = 0, |
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55 | |
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56 | _panStart = new THREE.Vector2(), |
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57 | _panEnd = new THREE.Vector2(); |
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58 | |
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59 | // for reset |
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60 | |
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61 | this.target0 = this.target.clone(); |
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62 | this.position0 = this.object.position.clone(); |
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63 | this.up0 = this.object.up.clone(); |
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64 | |
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65 | // events |
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66 | |
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67 | var changeEvent = { type: 'change' }; |
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68 | |
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69 | |
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70 | // methods |
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71 | |
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72 | this.handleResize = function () { |
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73 | |
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74 | if ( this.domElement === document ) { |
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75 | |
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76 | this.screen.left = 0; |
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77 | this.screen.top = 0; |
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78 | this.screen.width = window.innerWidth; |
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79 | this.screen.height = window.innerHeight; |
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80 | |
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81 | } else { |
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82 | |
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83 | this.screen = this.domElement.getBoundingClientRect(); |
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84 | |
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85 | } |
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86 | |
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87 | }; |
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88 | |
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89 | this.handleEvent = function ( event ) { |
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90 | |
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91 | if ( typeof this[ event.type ] == 'function' ) { |
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92 | |
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93 | this[ event.type ]( event ); |
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94 | |
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95 | } |
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96 | |
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97 | }; |
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98 | |
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99 | this.getMouseOnScreen = function ( clientX, clientY ) { |
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100 | |
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101 | return new THREE.Vector2( |
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102 | ( clientX - _this.screen.left ) / _this.screen.width, |
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103 | ( clientY - _this.screen.top ) / _this.screen.height |
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104 | ); |
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105 | |
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106 | }; |
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107 | |
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108 | this.getMouseProjectionOnBall = function ( clientX, clientY ) { |
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109 | |
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110 | var mouseOnBall = new THREE.Vector3( |
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111 | ( clientX - _this.screen.width * 0.5 - _this.screen.left ) / (_this.screen.width*.5), |
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112 | ( _this.screen.height * 0.5 + _this.screen.top - clientY ) / (_this.screen.height*.5), |
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113 | 0.0 |
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114 | ); |
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115 | |
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116 | var length = mouseOnBall.length(); |
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117 | |
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118 | if ( _this.noRoll ) { |
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119 | |
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120 | if ( length < Math.SQRT1_2 ) { |
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121 | |
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122 | mouseOnBall.z = Math.sqrt( 1.0 - length*length ); |
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123 | |
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124 | } else { |
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125 | |
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126 | mouseOnBall.z = .5 / length; |
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127 | |
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128 | } |
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129 | |
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130 | } else if ( length > 1.0 ) { |
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131 | |
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132 | mouseOnBall.normalize(); |
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133 | |
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134 | } else { |
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135 | |
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136 | mouseOnBall.z = Math.sqrt( 1.0 - length * length ); |
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137 | |
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138 | } |
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139 | |
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140 | _eye.copy( _this.object.position ).sub( _this.target ); |
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141 | |
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142 | var projection = _this.object.up.clone().setLength( mouseOnBall.y ); |
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143 | projection.add( _this.object.up.clone().cross( _eye ).setLength( mouseOnBall.x ) ); |
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144 | projection.add( _eye.setLength( mouseOnBall.z ) ); |
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145 | |
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146 | return projection; |
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147 | |
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148 | }; |
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149 | |
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150 | this.rotateCamera = function () { |
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151 | |
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152 | var angle = Math.acos( _rotateStart.dot( _rotateEnd ) / _rotateStart.length() / _rotateEnd.length() ); |
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153 | |
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154 | if ( angle ) { |
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155 | |
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156 | var axis = ( new THREE.Vector3() ).crossVectors( _rotateStart, _rotateEnd ).normalize(), |
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157 | quaternion = new THREE.Quaternion(); |
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158 | |
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159 | angle *= _this.rotateSpeed; |
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160 | |
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161 | quaternion.setFromAxisAngle( axis, -angle ); |
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162 | |
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163 | _eye.applyQuaternion( quaternion ); |
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164 | _this.object.up.applyQuaternion( quaternion ); |
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165 | |
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166 | _rotateEnd.applyQuaternion( quaternion ); |
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167 | |
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168 | if ( _this.staticMoving ) { |
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169 | |
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170 | _rotateStart.copy( _rotateEnd ); |
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171 | |
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172 | } else { |
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173 | |
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174 | quaternion.setFromAxisAngle( axis, angle * ( _this.dynamicDampingFactor - 1.0 ) ); |
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175 | _rotateStart.applyQuaternion( quaternion ); |
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176 | |
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177 | } |
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178 | |
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179 | } |
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180 | |
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181 | }; |
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182 | |
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183 | this.zoomCamera = function () { |
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184 | |
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185 | if ( _state === STATE.TOUCH_ZOOM ) { |
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186 | |
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187 | var factor = _touchZoomDistanceStart / _touchZoomDistanceEnd; |
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188 | _touchZoomDistanceStart = _touchZoomDistanceEnd; |
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189 | _eye.multiplyScalar( factor ); |
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190 | |
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191 | } else { |
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192 | |
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193 | var factor = 1.0 + ( _zoomEnd.y - _zoomStart.y ) * _this.zoomSpeed; |
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194 | |
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195 | if ( factor !== 1.0 && factor > 0.0 ) { |
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196 | |
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197 | _eye.multiplyScalar( factor ); |
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198 | |
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199 | if ( _this.staticMoving ) { |
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200 | |
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201 | _zoomStart.copy( _zoomEnd ); |
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202 | |
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203 | } else { |
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204 | |
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205 | _zoomStart.y += ( _zoomEnd.y - _zoomStart.y ) * this.dynamicDampingFactor; |
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206 | |
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207 | } |
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208 | |
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209 | } |
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210 | |
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211 | } |
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212 | |
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213 | }; |
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214 | |
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215 | this.panCamera = function () { |
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216 | |
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217 | var mouseChange = _panEnd.clone().sub( _panStart ); |
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218 | |
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219 | if ( mouseChange.lengthSq() ) { |
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220 | |
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221 | mouseChange.multiplyScalar( _eye.length() * _this.panSpeed ); |
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222 | |
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223 | var pan = _eye.clone().cross( _this.object.up ).setLength( mouseChange.x ); |
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224 | pan.add( _this.object.up.clone().setLength( mouseChange.y ) ); |
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225 | |
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226 | _this.object.position.add( pan ); |
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227 | _this.target.add( pan ); |
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228 | |
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229 | if ( _this.staticMoving ) { |
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230 | |
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231 | _panStart = _panEnd; |
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232 | |
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233 | } else { |
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234 | |
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235 | _panStart.add( mouseChange.subVectors( _panEnd, _panStart ).multiplyScalar( _this.dynamicDampingFactor ) ); |
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236 | |
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237 | } |
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238 | |
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239 | } |
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240 | |
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241 | }; |
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242 | |
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243 | this.checkDistances = function () { |
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244 | |
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245 | if ( !_this.noZoom || !_this.noPan ) { |
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246 | |
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247 | if ( _eye.lengthSq() > _this.maxDistance * _this.maxDistance ) { |
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248 | |
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249 | _this.object.position.addVectors( _this.target, _eye.setLength( _this.maxDistance ) ); |
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250 | |
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251 | } |
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252 | |
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253 | if ( _eye.lengthSq() < _this.minDistance * _this.minDistance ) { |
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254 | |
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255 | _this.object.position.addVectors( _this.target, _eye.setLength( _this.minDistance ) ); |
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256 | |
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257 | } |
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258 | |
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259 | } |
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260 | |
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261 | }; |
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262 | |
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263 | this.update = function () { |
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264 | |
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265 | _eye.subVectors( _this.object.position, _this.target ); |
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266 | |
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267 | if ( !_this.noRotate ) { |
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268 | |
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269 | _this.rotateCamera(); |
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270 | |
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271 | } |
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272 | |
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273 | if ( !_this.noZoom ) { |
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274 | |
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275 | _this.zoomCamera(); |
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276 | |
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277 | } |
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278 | |
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279 | if ( !_this.noPan ) { |
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280 | |
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281 | _this.panCamera(); |
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282 | |
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283 | } |
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284 | |
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285 | _this.object.position.addVectors( _this.target, _eye ); |
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286 | |
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287 | _this.checkDistances(); |
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288 | |
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289 | _this.object.lookAt( _this.target ); |
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290 | |
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291 | if ( lastPosition.distanceToSquared( _this.object.position ) > 0 ) { |
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292 | |
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293 | _this.dispatchEvent( changeEvent ); |
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294 | |
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295 | lastPosition.copy( _this.object.position ); |
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296 | |
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297 | } |
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298 | |
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299 | }; |
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300 | |
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301 | this.reset = function () { |
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302 | |
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303 | _state = STATE.NONE; |
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304 | _prevState = STATE.NONE; |
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305 | |
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306 | _this.target.copy( _this.target0 ); |
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307 | _this.object.position.copy( _this.position0 ); |
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308 | _this.object.up.copy( _this.up0 ); |
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309 | |
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310 | _eye.subVectors( _this.object.position, _this.target ); |
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311 | |
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312 | _this.object.lookAt( _this.target ); |
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313 | |
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314 | _this.dispatchEvent( changeEvent ); |
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315 | |
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316 | lastPosition.copy( _this.object.position ); |
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317 | |
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318 | }; |
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319 | |
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320 | // listeners |
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321 | |
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322 | function keydown( event ) { |
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323 | |
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324 | if ( _this.enabled === false ) return; |
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325 | |
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326 | window.removeEventListener( 'keydown', keydown ); |
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327 | |
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328 | _prevState = _state; |
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329 | |
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330 | if ( _state !== STATE.NONE ) { |
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331 | |
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332 | return; |
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333 | |
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334 | } else if ( event.keyCode === _this.keys[ STATE.ROTATE ] && !_this.noRotate ) { |
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335 | |
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336 | _state = STATE.ROTATE; |
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337 | |
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338 | } else if ( event.keyCode === _this.keys[ STATE.ZOOM ] && !_this.noZoom ) { |
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339 | |
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340 | _state = STATE.ZOOM; |
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341 | |
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342 | } else if ( event.keyCode === _this.keys[ STATE.PAN ] && !_this.noPan ) { |
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343 | |
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344 | _state = STATE.PAN; |
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345 | |
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346 | } |
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347 | |
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348 | } |
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349 | |
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350 | function keyup( event ) { |
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351 | |
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352 | if ( _this.enabled === false ) return; |
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353 | |
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354 | _state = _prevState; |
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355 | |
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356 | window.addEventListener( 'keydown', keydown, false ); |
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357 | |
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358 | } |
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359 | |
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360 | function mousedown( event ) { |
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361 | |
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362 | if ( _this.enabled === false ) return; |
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363 | |
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364 | event.preventDefault(); |
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365 | event.stopPropagation(); |
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366 | |
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367 | if ( _state === STATE.NONE ) { |
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368 | |
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369 | _state = event.button; |
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370 | |
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371 | } |
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372 | |
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373 | if ( _state === STATE.ROTATE && !_this.noRotate ) { |
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374 | |
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375 | _rotateStart = _this.getMouseProjectionOnBall( event.clientX, event.clientY ); |
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376 | _rotateEnd.copy(_rotateStart) |
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377 | |
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378 | } else if ( _state === STATE.ZOOM && !_this.noZoom ) { |
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379 | |
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380 | _zoomStart = _this.getMouseOnScreen( event.clientX, event.clientY ); |
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381 | _zoomEnd.copy(_zoomStart); |
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382 | |
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383 | } else if ( _state === STATE.PAN && !_this.noPan ) { |
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384 | |
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385 | _panStart = _this.getMouseOnScreen( event.clientX, event.clientY ); |
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386 | _panEnd.copy(_panStart) |
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387 | |
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388 | } |
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389 | |
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390 | document.addEventListener( 'mousemove', mousemove, false ); |
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391 | document.addEventListener( 'mouseup', mouseup, false ); |
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392 | |
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393 | } |
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394 | |
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395 | function mousemove( event ) { |
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396 | |
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397 | if ( _this.enabled === false ) return; |
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398 | |
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399 | event.preventDefault(); |
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400 | event.stopPropagation(); |
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401 | |
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402 | if ( _state === STATE.ROTATE && !_this.noRotate ) { |
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403 | |
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404 | _rotateEnd = _this.getMouseProjectionOnBall( event.clientX, event.clientY ); |
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405 | |
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406 | } else if ( _state === STATE.ZOOM && !_this.noZoom ) { |
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407 | |
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408 | _zoomEnd = _this.getMouseOnScreen( event.clientX, event.clientY ); |
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409 | |
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410 | } else if ( _state === STATE.PAN && !_this.noPan ) { |
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411 | |
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412 | _panEnd = _this.getMouseOnScreen( event.clientX, event.clientY ); |
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413 | |
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414 | } |
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415 | |
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416 | } |
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417 | |
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418 | function mouseup( event ) { |
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419 | |
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420 | if ( _this.enabled === false ) return; |
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421 | |
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422 | event.preventDefault(); |
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423 | event.stopPropagation(); |
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424 | |
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425 | _state = STATE.NONE; |
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426 | |
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427 | document.removeEventListener( 'mousemove', mousemove ); |
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428 | document.removeEventListener( 'mouseup', mouseup ); |
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429 | |
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430 | } |
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431 | |
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432 | function mousewheel( event ) { |
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433 | |
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434 | if ( _this.enabled === false ) return; |
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435 | |
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436 | event.preventDefault(); |
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437 | event.stopPropagation(); |
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438 | |
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439 | var delta = 0; |
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440 | |
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441 | if ( event.wheelDelta ) { // WebKit / Opera / Explorer 9 |
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442 | |
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443 | delta = event.wheelDelta / 40; |
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444 | |
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445 | } else if ( event.detail ) { // Firefox |
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446 | |
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447 | delta = - event.detail / 3; |
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448 | |
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449 | } |
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450 | |
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451 | _zoomStart.y += delta * 0.01; |
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452 | |
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453 | } |
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454 | |
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455 | function touchstart( event ) { |
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456 | |
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457 | if ( _this.enabled === false ) return; |
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458 | |
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459 | switch ( event.touches.length ) { |
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460 | |
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461 | case 1: |
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462 | _state = STATE.TOUCH_ROTATE; |
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463 | _rotateStart = _rotateEnd = _this.getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ); |
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464 | break; |
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465 | |
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466 | case 2: |
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467 | _state = STATE.TOUCH_ZOOM; |
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468 | var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX; |
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469 | var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY; |
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470 | _touchZoomDistanceEnd = _touchZoomDistanceStart = Math.sqrt( dx * dx + dy * dy ); |
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471 | break; |
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472 | |
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473 | case 3: |
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474 | _state = STATE.TOUCH_PAN; |
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475 | _panStart = _panEnd = _this.getMouseOnScreen( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ); |
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476 | break; |
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477 | |
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478 | default: |
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479 | _state = STATE.NONE; |
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480 | |
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481 | } |
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482 | |
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483 | } |
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484 | |
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485 | function touchmove( event ) { |
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486 | |
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487 | if ( _this.enabled === false ) return; |
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488 | |
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489 | event.preventDefault(); |
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490 | event.stopPropagation(); |
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491 | |
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492 | switch ( event.touches.length ) { |
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493 | |
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494 | case 1: |
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495 | _rotateEnd = _this.getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ); |
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496 | break; |
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497 | |
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498 | case 2: |
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499 | var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX; |
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500 | var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY; |
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501 | _touchZoomDistanceEnd = Math.sqrt( dx * dx + dy * dy ) |
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502 | break; |
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503 | |
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504 | case 3: |
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505 | _panEnd = _this.getMouseOnScreen( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ); |
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506 | break; |
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507 | |
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508 | default: |
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509 | _state = STATE.NONE; |
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510 | |
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511 | } |
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512 | |
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513 | } |
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514 | |
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515 | function touchend( event ) { |
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516 | |
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517 | if ( _this.enabled === false ) return; |
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518 | |
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519 | switch ( event.touches.length ) { |
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520 | |
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521 | case 1: |
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522 | _rotateStart = _rotateEnd = _this.getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ); |
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523 | break; |
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524 | |
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525 | case 2: |
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526 | _touchZoomDistanceStart = _touchZoomDistanceEnd = 0; |
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527 | break; |
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528 | |
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529 | case 3: |
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530 | _panStart = _panEnd = _this.getMouseOnScreen( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ); |
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531 | break; |
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532 | |
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533 | } |
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534 | |
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535 | _state = STATE.NONE; |
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536 | |
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537 | } |
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538 | |
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539 | this.domElement.addEventListener( 'contextmenu', function ( event ) { event.preventDefault(); }, false ); |
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540 | |
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541 | this.domElement.addEventListener( 'mousedown', mousedown, false ); |
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542 | |
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543 | this.domElement.addEventListener( 'mousewheel', mousewheel, false ); |
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544 | this.domElement.addEventListener( 'DOMMouseScroll', mousewheel, false ); // firefox |
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545 | |
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546 | this.domElement.addEventListener( 'touchstart', touchstart, false ); |
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547 | this.domElement.addEventListener( 'touchend', touchend, false ); |
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548 | this.domElement.addEventListener( 'touchmove', touchmove, false ); |
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549 | |
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550 | window.addEventListener( 'keydown', keydown, false ); |
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551 | window.addEventListener( 'keyup', keyup, false ); |
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552 | |
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553 | this.handleResize(); |
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554 | |
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555 | }; |
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556 | |
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557 | THREE.TrackballControls.prototype = Object.create( THREE.EventDispatcher.prototype ); |
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