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pano.js
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pano.js
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/**
* @preserve Copyright (c) 2013 Humu <[email protected]>
* Pano.js can be freely distributed under the terms of the MIT license.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
var Pano = Pano || {};
(function() {
var DEG2RAD = Math.PI / 180;
var RAD2DEG = 180 / Math.PI;
/**
* Collect platform and browser info.
*/
var is_touch_device = window.createTouch != undefined;
var is_canvas_available = window.HTMLCanvasElement != undefined;
var is_webgl_available = window.WebGLRenderingContext != undefined;
var is_firefox = /Firefox[\/\s]\d+(?:.\d+)*/.test(window.navigator.userAgent);
var is_opera = /Opera[\/\s]\d+(?:.\d+)*/.test(window.navigator.userAgent);
var requestAnimationFrame = window.requestAnimationFrame || function(callback) {
setTimeout(callback, 17);
};
var new_label_id = 0;
var label_layer_style = null;
var default_label_style = null;
var util_canvas = null;
var screenshot_helper = null;
var screenshot_method = 'unknown';
var label_style_template = '.label-frame { \n' +
' position:absolute; \n' +
' width:200px; \n' +
' padding:8px; \n' +
' border:3px solid #5a8f00; \n' +
' font:1em/1.4 Cambria, Georgia, sans-serif; \n' +
' color:#333; \n' +
' background:#fff; \n' +
' text-align:left; \n' +
' -webkit-border-radius:10px; \n' +
' -moz-border-radius:10px; \n' +
' -o-border-radius:10px; \n' +
' -ms-border-radius:10px; \n' +
' border-radius:10px; \n' +
' -webkit-user-select:none; \n' +
' -moz-user-select:none; \n' +
' -o-user-select:none; \n' +
' -ms-user-select:none; \n' +
' user-select:none; \n' +
' pointer-events:none; \n' +
'}';
var label_layer_style_template = '.label-layer { \n' +
' position:absolute; \n' +
' overflow:hidden; \n' +
' pointer-events:none; \n' +
'}\n' +
/*
* For Opera 9.x ~ 12.x which does not support CSS pointer-events.
* See http://caniuse.com/pointer-events and
* http://www.opera.com/docs/specs/presto2.12/css/o-vendor/.
*/
'x:-o-prefocus, .label-layer { \n' +
' visibility: hidden; \n' +
'}';
var equirectangular_vs = '#ifdef GL_ES \n' +
' precision mediump float; \n' +
'#endif \n' +
'attribute vec2 a_position; \n' +
'varying vec2 v_fraction; \n' +
'void main(void) { \n' +
' v_fraction = vec2(0.5, -0.5) * a_position + vec2(0.5, 0.5); \n' +
' gl_Position = vec4(a_position, 0.0, 1.0); \n' +
'}';
var equirectangular_fs = '#ifdef GL_ES \n' +
' precision mediump float; \n' +
'#endif \n' +
'#define PI 3.1415927 \n' +
'uniform vec3 u_camUp; \n' +
'uniform vec3 u_camRight; \n' +
'uniform vec3 u_camPlaneOrigin; \n' +
'uniform sampler2D s_texture; \n' +
'varying vec2 v_fraction; \n' +
'void main(void) { \n' +
' vec3 ray = u_camPlaneOrigin + v_fraction.x * u_camRight - v_fraction.y * u_camUp; \n' +
' ray = normalize(ray); \n' +
' float theta = acos(ray.y) / PI; \n' +
' float phi = 0.5 * (atan(ray.z, ray.x) + PI) / PI; \n' +
' gl_FragColor = texture2D(s_texture, vec2(phi, theta)); \n' +
'}';
var sprite_vs = '#ifdef GL_ES \n' +
' precision mediump float; \n' +
'#endif \n' +
'uniform vec2 u_anchor; \n' +
'uniform vec2 u_size; \n' +
'attribute vec2 a_position; \n' +
'varying vec2 v_texcoord; \n' +
'void main(void) { \n' +
' v_texcoord = vec2(0.5, -0.5) * a_position + vec2(0.5, 0.5); \n' +
' gl_Position = vec4(u_anchor + u_size * a_position, 0.0, 1.0); \n' +
'}';
var sprite_fs = '#ifdef GL_ES \n' +
' precision mediump float; \n' +
'#endif \n' +
'uniform float u_alpha; \n' +
'uniform sampler2D s_texture; \n' +
'varying vec2 v_texcoord; \n' +
'void main(void) { \n' +
' gl_FragColor = u_alpha * texture2D(s_texture, v_texcoord); \n' +
'}';
function clamp(val, min, max) {
return Math.max(min, Math.min(max, val));
}
function makeSFVec() {
return window.Float32Array ? (new window.Float32Array(arguments)) : Array.prototype.slice.call(arguments, 0);
}
function eulerToQuat(heading, pitch) {
var halfHeadingRads = 0.5 * heading * DEG2RAD;
var halfPitchRads = 0.5 * (pitch - 90) * DEG2RAD;
var ch = Math.cos(halfHeadingRads);
var sh = Math.sin(halfHeadingRads);
var cp = Math.cos(halfPitchRads);
var sp = Math.sin(halfPitchRads);
return [ch*sp, sh*cp, -sh*sp, ch*cp];
}
function quatToEuler(x, y, z, w) {
var sp = -2 * (y * z - w * x);
// floating point error may result in invalid inputs for asin()
sp = clamp(sp, -1, 1);
var pitch = Math.asin(sp) * RAD2DEG;
var heading = Math.atan2(x * z + w * y, 0.5 - x * x - y * y) * RAD2DEG;
return [heading, pitch+90];
}
function intersectRects(r0, r1) {
var left = Math.max(r0.left, r1.left);
var top = Math.max(r0.top, r1.top);
var right = Math.min(r0.right, r1.right);
var bottom = Math.min(r0.bottom, r1.bottom);
return {
left: left,
top: top,
right: right,
bottom: bottom,
width: right-left,
height: bottom-top
};
}
function isPowerOfTwo(n) {
return (n & (n - 1)) == 0;
}
function getScriptPath(name, ignoreCase) {
var searchPattern = new RegExp('/' + name + '$', ignoreCase ? 'i' : '');
var scripts = document.getElementsByTagName("script");
for (var i=0; i<scripts.length; i++) {
var index = scripts[i].src.search(searchPattern);
if (index >= 0) {
return scripts[i].src.substring(0, index + 1);
}
}
return null;
}
function addCSSStyle(template) {
var cssStyle = document.createElement('style');
cssStyle.type = 'text/css';
cssStyle.innerHTML = template;
document.getElementsByTagName('head')[0].appendChild(cssStyle);
return cssStyle;
}
function getUtilCanvas(width, height, clear) {
var isClean = false;
if (!util_canvas) {
util_canvas = document.createElement('canvas');
isClean = true;
}
if (!util_canvas)
return null;
if (util_canvas.width != width || util_canvas.height != height) {
util_canvas.width = width;
util_canvas.height = height;
isClean = true;
}
if (!isClean && clear != false) {
var ctx = util_canvas.getContext('2d');
ctx.clearRect(0, 0, width, height);
}
return util_canvas;
}
function generateImageFromCanvas(canvas) {
var img = new Image;
try {
img.src = canvas.toDataURL();
}
catch (e) {
}
return img;
}
function getDataURLFromCanvas(canvas, type, quality) {
type = type || 'image/png';
/*
* It seems Firefox's implementation does not like the 2nd argument for toDataURL() which
* specifies an expected quality level. A security error will occur if it is set. See
* https://bugzilla.mozilla.org/show_bug.cgi?id=564388 for more details.
*/
return is_firefox ? canvas.toDataURL(type) : canvas.toDataURL(type, quality || 0.8);
}
function getWebGL(canvas) {
var ctx3dNames = ['webgl', 'experimental-webgl'];
for (var i=0; i<ctx3dNames.length; i++) {
try {
var gl = canvas.getContext(ctx3dNames[i]);
if (gl)
return gl;
}
catch (e) {
}
}
return null;
}
function createProgram(gl, vsource, fsource) {
var vShader = gl.createShader(gl.VERTEX_SHADER);
gl.shaderSource(vShader, vsource);
gl.compileShader(vShader);
if (!gl.getShaderParameter(vShader, gl.COMPILE_STATUS)) {
console.info(gl.getShaderInfoLog(vShader));
throw 'Vertex shader compilation error';
}
var fShader = gl.createShader(gl.FRAGMENT_SHADER);
gl.shaderSource(fShader, fsource);
gl.compileShader(fShader);
if (!gl.getShaderParameter(fShader, gl.COMPILE_STATUS)) {
console.info(gl.getShaderInfoLog(fShader));
throw 'Fragment shader compilation error';
}
var program = gl.createProgram();
gl.attachShader(program, vShader);
gl.attachShader(program, fShader);
gl.linkProgram(program);
if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
console.info(gl.getProgramInfoLog(program));
throw 'Program linking error';
}
return program;
}
/**
@class View
*/
function View(canvas, params) {
this.canvas = (typeof canvas) == 'string' ? document.getElementById(canvas) : canvas;
this.init_heading = 90;
this.init_pitch = 90;
this.init_fov = 90;
this.inertial_move = 'on';
this.image_filtering = 'on-idle';
this.img = null;
this.is_loading = false;
this.is_loaded = false;
this.labels = [];
this.label_layer = null;
this.lensFlares = [];
this.flareImgs = {};
var forceWebGLRendering = false;
var forceSoftwareRendering = false;
if (params) {
if ((typeof params['heading']) == 'number')
this.init_heading = params['heading'];
if ((typeof params['pitch']) == 'number')
this.init_pitch = clamp(params['pitch'], 0, 180);
if ((typeof params['fov']) == 'number')
this.init_fov = clamp(params['fov'], 30, 90);
if (params['rendering'] == 'webgl')
forceWebGLRendering = true;
else if (params['rendering'] == 'software')
forceSoftwareRendering = true;
if ((typeof params['inertial'] == 'string'))
this.inertial_move = params['inertial'];
if ((typeof params['filtering']) == 'string')
this.image_filtering = params['filtering'];
}
this.cam_heading = this.init_heading;
this.cam_pitch = this.init_pitch;
this.cam_fov = this.init_fov;
this.cam_plane = {
dir: makeSFVec(0, 0, 0),
up: makeSFVec(0, 0, 0),
right: makeSFVec(0, 0, 0),
origin: makeSFVec(0, 0, 0)
};
var self = this;
this.inert_fov_step = 0;
this.inert_heading_step = 0;
this.idle = true;
this.last_draw_ms = 0;
this.button_states = {};
this.pointer_position = [0, 0];
this.canvas.addEventListener('mousedown', function(evt) {
self.button_states[evt.button] = true;
self.pointer_position[0] = evt.clientX;
self.pointer_position[1] = evt.clientY;
evt.preventDefault();
evt.stopPropagation();
});
this.canvas.addEventListener('mouseup', function(evt) {
self.button_states[evt.button] = false;
evt.preventDefault();
evt.stopPropagation();
});
this.canvas.addEventListener('mouseout', function(evt) {
self.button_states[evt.button] = false;
evt.preventDefault();
evt.stopPropagation();
});
this.canvas.addEventListener('mousemove', function(evt) {
if (self.is_loaded && !self.is_navigating) {
if (self.button_states[0]) {
var deltaHeading = -(evt.clientX - self.pointer_position[0]) * 360 / self.canvas.width;
if (self.inertial_move == 'on') {
if ((deltaHeading > 0 && deltaHeading > self.inert_heading_step) || (deltaHeading < 0 && deltaHeading < self.inert_heading_step))
self.inert_heading_step = deltaHeading;
}
else {
self.cam_heading += deltaHeading;
}
self.cam_pitch += (evt.clientY - self.pointer_position[1]) * 180 / self.canvas.height;
self.cam_pitch = clamp(self.cam_pitch, 0, 180);
self.pointer_position[0] = evt.clientX;
self.pointer_position[1] = evt.clientY;
self.update();
}
}
evt.preventDefault();
evt.stopPropagation();
});
this.canvas.addEventListener(is_firefox ? 'DOMMouseScroll' : 'mousewheel', function(evt) {
if (self.is_loaded && !self.is_navigating) {
var newFov = self.cam_fov - (is_firefox ? -40*evt.detail : evt.wheelDelta) / 60;
newFov = clamp(newFov, 30, 90);
var deltaFov = newFov - self.cam_fov;
if (Math.abs(deltaFov) > 0) {
if (self.inertial_move == 'on') {
if ((deltaFov > 0 && deltaFov > self.inert_fov_step) || (deltaFov < 0 && deltaFov < self.inert_fov_step))
self.inert_fov_step = deltaFov;
}
else {
self.cam_fov += deltaFov;
}
self.update();
}
}
evt.preventDefault();
evt.stopPropagation();
});
window.addEventListener('resize', function() {
self._repositionLabelLayer();
self.update();
});
this.saved_canvas_pos = null;
this.dirty = false;
this.renderer = null;
this.is_webgl_enabled = false;
if (is_webgl_available && !forceSoftwareRendering) {
try {
this.renderer = new WebGLRenderer(this);
this.is_webgl_enabled = true;
}
catch (e) {
}
}
if (!this.renderer) {
if (forceWebGLRendering)
throw 'WebGL renderer is not available';
this.renderer = new Canvas2DRenderer(this);
}
this.is_navigating = false;
this.on_load_handler = null;
this.on_abort_handler = null;
this.on_error_handler = null;
this.on_load_start_handler = null;
this.on_load_end_handler = null;
this.on_enter_frame_handler = null;
this.on_exit_frame_handler = null;
var inertial_yaw = function() {
if (self.inert_heading_step != 0) {
self.cam_heading += self.inert_heading_step;
self.inert_heading_step *= 0.75;
if (Math.abs(self.inert_heading_step) < 0.1)
self.inert_heading_step = 0;
return true;
}
return false;
};
var inertial_zoom = function() {
if (self.inert_fov_step != 0) {
self.cam_fov += self.inert_fov_step;
self.inert_fov_step *= 0.7;
self.inert_fov_step = clamp(self.cam_fov + self.inert_fov_step, 30, 90) - self.cam_fov;
if (Math.abs(self.inert_fov_step) < 0.1)
self.inert_fov_step = 0;
return true;
}
return false;
};
var tick = function() {
if (self.is_navigating) {
// update the tweening engine to perform navigation animations
TWEEN.update();
}
if (self.dirty) {
// unset idle flag
self.idle = false;
// draw a new frame and see if there are further animations
var has_next_frame = false;
if (self.inertial_move == 'on') {
has_next_frame = inertial_yaw();
has_next_frame = inertial_zoom() || has_next_frame;
}
self._draw();
self._layoutLabels();
self.dirty = has_next_frame;
}
else if (!self.idle && (Date.now() - self.last_draw_ms >= 250)) {
// set idle flag
self.idle = true;
// draw a new frame with texture filtering on
if (!self.is_webgl_enabled && self.image_filtering == 'on-idle')
self._draw();
}
setTimeout(tick, 30);
};
// start ticking
tick();
// load the given equirectangular image if any
if (params && (typeof params['equirectangular']) == 'string' && params['equirectangular'] != '')
this.load(params['equirectangular']);
}
View.prototype = {
get domElement() {
return this.canvas;
},
get isMaximized() {
return this.saved_canvas_pos != null;
},
get filtering() {
return this.image_filtering;
},
set filtering(value) {
this.image_filtering = value;
},
get onLoad() {
return this.on_load_handler;
},
set onLoad(callback) {
if (!callback || (typeof callback) == 'function')
this.on_load_handler = callback;
},
get OnLoadStart() {
return this.on_load_start_handler;
},
set OnLoadStart(callback) {
if (!callback || (typeof callback) == 'function')
this.on_load_start_handler = callback;
},
get OnLoadEnd() {
return this.on_load_end_handler;
},
set OnLoadEnd(callback) {
if (!callback || (typeof callback) == 'function')
this.on_load_end_handler = callback;
},
get onAbort() {
return this.on_abort_handler;
},
set onAbort(callback) {
if (!callback || (typeof callback) == 'function')
this.on_abort_handler = callback;
},
get onError() {
return this.on_error_handler;
},
set onError(callback) {
if (!callback || (typeof callback) == 'function')
this.on_error_handler = callback;
},
get onEnterFrame() {
return this.on_enter_frame_handler;
},
set onEnterFrame(callback) {
if (!callback || (typeof callback) == 'function')
this.on_enter_frame_handler = callback;
},
get onExitFrame() {
return this.on_exit_frame_handler;
},
set onExitFrame(callback) {
if (!callback || (typeof callback) == 'function')
this.on_exit_frame_handler = callback;
},
load: function(url, reset) {
// cancel downloading of the previous image if any
if (this.is_loading) {
this.img.onload = this.img.onabort = this.img.onerror = null;
this.img.src = '';
this.img = null;
this.is_loading = false;
}
var self = this;
this.img = new Image;
this.img.onload = function() {
self.img = null; // do not cache the image object in view instance
if (reset || reset == undefined) {
self.cam_heading = self.init_heading;
self.cam_pitch = self.init_pitch;
self.cam_fov = self.init_fov;
}
if (self.is_loaded) {
self._destroyLabels();
self.flareImgs = {};
self.lensFlares.length = 0;
self.renderer.init();
}
self.is_loading = false;
self.is_loaded = true;
if (self.on_load_handler)
self.on_load_handler.call(null, self);
if (self.on_load_end_handler)
self.on_load_end_handler.call(null, self);
self.renderer.setImage(this);
self.update();
};
this.img.onabort = function() {
self.img = null; // do not cache the image object in view instance
self.is_loading = false;
if (self.on_abort_handler)
self.on_abort_handler.call(null, self);
if (self.on_load_end_handler)
self.on_load_end_handler.call(null, self);
};
this.img.onerror = function() {
self.img = null; // do not cache the image object in view instance
self.is_loading = false;
if (self.on_error_handler)
self.on_error_handler.call(null, self);
if (self.on_load_end_handler)
self.on_load_end_handler.call(null, self);
};
this.is_loading = true;
if (this.on_load_start_handler)
this.on_load_start_handler.call(null, this);
this.img.src = url;
},
reset: function() {
// stop navigation if any and reset the camera
if (this.is_navigating) {
TWEEN.removeAll();
this.is_navigating = false;
}
this.cam_heading = this.init_heading;
this.cam_pitch = this.init_pitch;
this.cam_fov = this.init_fov;
this.update();
},
yaw: function(degs) {
var newHeading = this.cam_heading + degs;
if (Math.abs(newHeading - this.cam_heading) > 0) {
if (this.inertial_move == 'on')
this.inert_heading_step = newHeading - this.cam_heading;
else
this.cam_heading = newHeading;
this.update();
}
},
pitch: function(degs) {
var newPitch = clamp(this.cam_pitch + degs, 0, 180);
if (Math.abs(newPitch - this.cam_pitch) > 0) {
this.cam_pitch = newPitch;
this.update();
}
},
zoom: function(degs) {
var newFov = clamp(this.cam_fov + degs, 30, 90);
if (Math.abs(newFov - this.cam_fov) > 0) {
if (this.inertial_move == 'on')
this.inert_fov_step = newFov - this.cam_fov;
else
this.cam_fov = newFov;
this.update();
}
},
jumpTo: function(heading, pitch, fov) {
if (heading != undefined)
this.cam_heading = heading;
if (pitch != undefined)
this.cam_pitch = clamp(pitch, 0, 180);
if (fov != undefined)
this.cam_fov = clamp(fov, 30, 90);
this.update();
},
navigateTo: function(heading, pitch, fov, duration, callbackOnArrival, easingFn) {
// prevent from starting another navigation when the current one is still active
if (this.is_navigating)
return;
heading = (heading != undefined) ? heading : this.cam_heading;
pitch = (pitch != undefined) ? clamp(pitch, 0, 180) : this.cam_pitch;
fov = (fov != undefined) ? clamp(fov, 30, 90) : this.cam_fov;
duration = (duration != undefined) ? duration : 2000;
if ((typeof easingFn) == 'string') {
var matches = /^(\w+)\.(\w+)$/.exec(easingFn);
easingFn = (matches && TWEEN.Easing[matches[1]]) ? TWEEN.Easing[matches[1]][matches[2]] : undefined;
}
easingFn = easingFn || TWEEN.Easing.Quadratic.InOut;
var self = this;
var start = {heading: this.cam_heading, pitch: this.cam_pitch, fov: this.cam_fov};
var end = {heading: heading, pitch: pitch, fov: fov};
var camInterpolator = new CameraInterpolator(start, end);
var fraction = {value: 0};
var tween = (new TWEEN.Tween(fraction)).to({value: 0.999}, duration).easing(easingFn);
tween.onUpdate(function() {
var cam = camInterpolator.interpolate(fraction.value);
self.cam_heading = cam.heading;
self.cam_pitch = cam.pitch;
self.cam_fov = cam.fov;
self.update();
});
tween.onComplete(function() {
self.is_navigating = false;
if (callbackOnArrival && (typeof callbackOnArrival) == 'function')
callbackOnArrival.call(null, self);
});
tween.start();
this.is_navigating = true;
},
playTour: function(path) {
if (path.length == 0)
return;
var self = this;
var navigateToNode = function(index) {
var node = path[index];
self.navigateTo( node.heading, node.pitch, node.fov, node.duration,
(index + 1 == path.length) ? // already reaches the end of the tour?
node.onArrival :
function() {
// invoke the callback of the current node, if any
if (node.onArrival && (typeof node.onArrival) == 'function')
node.onArrival.call(null, self);
// then continue to next node
if (node.hoverTime > 0)
setTimeout(function() {
navigateToNode(index + 1);
}, node.hoverTime);
else
navigateToNode(index + 1);
}
);
};
// start tour
navigateToNode(0);
},
addLabel: function(innertHTML, heading, pitch, isInteractive, frameOptions, callbackOnLayout) {
if (!default_label_style)
default_label_style = addCSSStyle(label_style_template);
if (!this.label_layer) {
if (!label_layer_style)
label_layer_style = addCSSStyle(label_layer_style_template);
var canvasRect = this.canvas.getBoundingClientRect();
this.label_layer = document.createElement('div');
this.label_layer.className = 'label-layer';
this.label_layer.style.left = canvasRect.left + 'px';
this.label_layer.style.top = canvasRect.top + 'px';
this.label_layer.style.width = canvasRect.width + 'px';
this.label_layer.style.height = canvasRect.height + 'px';
document.body.appendChild(this.label_layer);
}
var isEnclosedByTag = /^\s*<([a-z][a-z0-9]*)(?:(?:\s+[^<>]*>)|>).*<\/\1>\s*$/.test(innertHTML.replace(/\n/g, ''));
var container = document.createElement('div');
container.innerHTML = innertHTML;
if (!isEnclosedByTag || frameOptions) {
container.className = 'label-frame';
if (frameOptions) {
if (frameOptions.width)
container.style.width = frameOptions.width;
if (frameOptions.foregroundColor)
container.style.color = frameOptions.foregroundColor;
if (frameOptions.backgroundColor)
container.style.backgroundColor = frameOptions.backgroundColor;
if (frameOptions.textAlign)
container.style.textAlign = frameOptions.textAlign;
if (frameOptions.borderWidth)
container.style.borderWidth = frameOptions.borderWidth;
if (frameOptions.borderColor)
container.style.borderColor = frameOptions.borderColor;
}
}
else {
container.style.position = 'absolute';
}
if (isInteractive)
container.style.pointerEvents = 'auto';
container.style.visibility = 'hidden';
container.id = 'lb-' + ++new_label_id;
this.label_layer.appendChild(container);
this.labels.push({
element: container,
heading: heading,
pitch: pitch,
onLayout: (typeof callbackOnLayout) == 'function' ? callbackOnLayout : null
});
this.update();
return container.id;
},
addLensFlare: function(flareImgURLs, heading, pitch, range, scales) {
range = range || 1;
var self = this;
var flares = [];
for (var i=0; i<flareImgURLs.length; i++) {
var url = flareImgURLs[i];
if (!(url in this.flareImgs)) {
var img = new Image;
img.onload = function() {
var flareObj = self.flareImgs[this.key];
flareObj.ready = true;
flareObj.renderId = self.renderer.addSpriteImage(this);
};
this.flareImgs[url] = {
img: img,
ready: false,
renderId: -1
};
img.key = url;
img.src = url;
}
flares.push({
obj: this.flareImgs[url],
scale: (scales && scales[i] > 0) ? scales[i] : 1,
dist: (i + Math.random()) * range / flareImgURLs.length
});
}
this.lensFlares.push({
flares: flares,
heading: heading,
pitch: pitch,
range: range || 1
});
},
eulerToView: function(heading, pitch) {
var dir = this.cam_plane.dir;
var up = this.cam_plane.up;
var right = this.cam_plane.right;
var origin = this.cam_plane.origin;
// create a ray from the given angles
var rayX = Math.sin(pitch * DEG2RAD) * Math.sin(heading * DEG2RAD);
var rayY = Math.cos(pitch * DEG2RAD);
var rayZ = Math.sin(pitch * DEG2RAD) * Math.cos(heading * DEG2RAD);
// calculate dot product of the ray and the look-at vector of current camera plane
var t = rayX * dir[0] + rayY * dir[1] + rayZ * dir[2];
// no intersection?
if (t <= 0)
return null;
t = 1 / t;
// calculate the vector from the origin of the camera plane to the intersection point
var dx = t * rayX - origin[0];
var dy = t * rayY - origin[1];
var dz = t * rayZ - origin[2];
var ratioUp = 2 * Math.tan(0.5 * this.cam_fov * DEG2RAD);
var ratioRight = this.canvas.width * ratioUp / this.canvas.height;
// project the vector onto the up and the right vectors of the camera plane to calculate
// fractions on both directions
var fractUp = -(dx * up[0] + dy * up[1] + dz * up[2]) / (ratioUp * ratioUp);
var fractRight = (dx * right[0] + dy * right[1] + dz * right[2]) / (ratioRight * ratioRight);
return [Math.floor(0.5 + fractRight * this.canvas.width), Math.floor(0.5 + fractUp * this.canvas.height)];
},
viewToEuler: function(x, y) {
var dir = this.cam_plane.dir;
var up = this.cam_plane.up;
var right = this.cam_plane.right;
var origin = this.cam_plane.origin;
var fractUp = y / this.canvas.height;
var fractRight = x / this.canvas.width;
// create a ray from the given coordinate
var rayX = origin[0] + right[0] * fractRight - up[0] * fractUp;
var rayY = origin[1] + right[1] * fractRight - up[1] * fractUp;
var rayZ = origin[2] + right[2] * fractRight - up[2] * fractUp;
// calculate angles from the ray
var heading = 0.5 * Math.PI - Math.atan2(rayZ, rayX);
var pitch = Math.acos(rayY / Math.sqrt(rayX*rayX + rayY*rayY + rayZ*rayZ));
return [RAD2DEG * heading, RAD2DEG * pitch];
},
maximize: function() {
if (!this.saved_canvas_pos) {
// save current size and position of the canvas
this.saved_canvas_pos = {
zIndex: this.canvas.style.zIndex,
position: this.canvas.style.position,
left: this.canvas.style.left,
top: this.canvas.style.top,
innerWidth: this.canvas.style.width,
innerHeight: this.canvas.style.height,
logicalWidth: this.canvas.width,
logicalHeight: this.canvas.height
};
// set canvas to the topmost layer and resize it to fill the whole client area of the page
this.canvas.style.zIndex = '1024';
this.canvas.style.position = 'fixed';
this.canvas.style.left = '0px';
this.canvas.style.top = '0px';
this.canvas.style.width = '100%';
this.canvas.style.height = '100%';
// also reposition the label layer
if (this.label_layer) {
this._repositionLabelLayer();
this.label_layer.style.zIndex = '1025';
this.label_layer.style.position = 'fixed';
}
// redraw with the new size
this.update();
}
},
restore: function() {
if (this.saved_canvas_pos) {
// restore canvas size and position
this.canvas.style.zIndex = this.saved_canvas_pos.zIndex;
this.canvas.style.position = this.saved_canvas_pos.position;
this.canvas.style.left = this.saved_canvas_pos.left;
this.canvas.style.top = this.saved_canvas_pos.top;
this.canvas.style.width = this.saved_canvas_pos.innerWidth;
this.canvas.style.height = this.saved_canvas_pos.innerHeight;
this.canvas.width = this.saved_canvas_pos.logicalWidth;
this.canvas.height = this.saved_canvas_pos.logicalHeight;
// remove the saved canvas state
this.saved_canvas_pos = null;
// restore size and position of the label layer
if (this.label_layer) {
this._repositionLabelLayer();
this.label_layer.style.zIndex = '';
this.label_layer.style.position = 'absolute';
}
// redraw with the new size
this.update();
}
},
saveScreenshot: function(basename, format, quality) {
basename = basename || 'screenshot';
format = (format == 'jpg' ? 'jpeg' : format) || 'jpeg';
quality = quality || 0.8;
if (screenshot_method == 'unknown') {
screenshot_helper = document.createElement('a');
if ((typeof screenshot_helper.download) == 'string') {
screenshot_method = 'local';
screenshot_helper.id = 'screenshot-helper';
screenshot_helper.href = 'javscript:void(0)';
}
else {
screenshot_method = 'remote';
screenshot_helper = document.createElement('iframe');
screenshot_helper.id = 'screenshot-helper';
screenshot_helper.name = 'screenshot-helper';
}
screenshot_helper.style.display = 'none';
document.body.appendChild(screenshot_helper);
}