jslint
[Portfolio.git] / skins / photo_film_viewer.js
1 /*
2 * © 2008-2014 Benoît Pin – Centre de recherche en informatique – MINES ParisTech
3 * http://plinn.org
4 * Licence Creative Commons http://creativecommons.org/licenses/by-nc/2.0/
5 *
6 *
7 */
8
9 var FilmSlider;
10
11 (function(){
12
13 var keyLeft = 37, keyRight = 39;
14 var isTextMime = /^text\/.+/i;
15 var isAddToSelection = /.*\/add_to_selection$/;
16 var imgRequestedSize = /size=(\d+)/;
17 var DEFAULT_IMAGE_SIZES = [500, 600, 800];
18
19 FilmSlider = function(filmBar, slider, ctxInfos, image, toolbar, breadcrumbs) {
20 var thisSlider = this;
21 this.filmBar = filmBar;
22 var film = filmBar.firstChild;
23 if (film.nodeType === 3) { film = film.nextSibling; }
24 this.film = film;
25 this.slider = slider;
26 this.rail = slider.parentNode;
27 this.sliderSpeedRatio = undefined;
28 this.sliderRatio = undefined;
29 this.selectedSlide = undefined;
30 this.selectedSlideInSelection = undefined;
31 this.cartSlide = document.getElementById('cart_slide');
32 this.image = image;
33 this.stretchable = image.parentNode;
34 this.viewMode = 'medium';
35
36 this.buttons = [];
37 this.toolbar = toolbar;
38 if (breadcrumbs) {
39 var bcElements = breadcrumbs.getElementsByTagName('a');
40 this.lastBCElement = bcElements[bcElements.length-1];
41 var imgSrcParts = image.src.split('/');
42 this.lastBCElement.innerHTML = imgSrcParts[imgSrcParts.length-2];
43 this.hasBreadcrumbs = true;
44 }
45 else {
46 this.hasBreadcrumbs = false;
47 }
48
49 var buttons = toolbar.getElementsByTagName('img');
50 var b, name, i;
51 for (i=0 ; i<buttons.length ; i++) {
52 b = buttons[i];
53 name = b.getAttribute('name');
54 if (name) { this.buttons[name] = b; }
55 }
56
57 this.pendingImage = new Image();
58 this.pendingImage.onload = function() {
59 thisSlider.refreshImage();
60 };
61 this.initialized = false;
62
63 this.film.style.left='0';
64 this.film.style.top='0';
65
66 this.filmLength = ctxInfos.filmLength;
67 this.center = ctxInfos.center;
68 this.slideSize = ctxInfos.slideSize;
69 this.ctxUrlTranslation = ctxInfos.ctxUrlTranslation;
70
71 this.ddHandlers = {'down' : function(evt){thisSlider.mouseDownHandler(evt);},
72 'move' : function(evt){thisSlider.mouseMoveHandler(evt);},
73 'up' : function(evt){thisSlider.mouseUpHandler(evt);},
74 'out' : function(evt){thisSlider.mouseOutHandler(evt);}
75 };
76
77 this.resizeSlider();
78 this.addEventListeners();
79 };
80
81
82 FilmSlider.prototype.resizeSlider = function(evt) {
83 var filmBarWidth = getObjectWidth(this.filmBar);
84 if (!filmBarWidth) {
85 var thisSlider = this;
86 addListener(window, 'load', function(evt){thisSlider.resizeSlider(evt);});
87 return;
88 }
89
90 var filmWidth = this.slideSize * this.filmLength;
91 var sliderRatio = this.sliderRatio = filmBarWidth / filmWidth;
92 var sliderWidth = filmBarWidth * sliderRatio;
93 this.rail.style.width = filmBarWidth + 'px';
94 this.rail.style.display = 'block';
95 this.rail.style.visibility = 'visible';
96 if (sliderRatio < 1) {
97 this.slider.style.width = Math.round(sliderWidth) + 'px';
98 this.slider.style.visibility = 'visible';
99 }
100 else {
101 this.slider.style.visibility = 'hidden';
102 }
103
104 this.winSize = {'width' : getWindowWidth(),
105 'height' : getWindowHeight()};
106 this.maxRightPosition = filmBarWidth - sliderWidth;
107 this.sliderSpeedRatio = - (filmBarWidth - sliderWidth) / (filmWidth - filmBarWidth);
108 if (!this.initialized) {
109 this.centerSlide(this.center);
110 this.selectedSlide = this.filmBar.getElementsByTagName('img')[this.center].parentNode;
111 this.initialized = true;
112 }
113 };
114
115 FilmSlider.prototype.fitToScreen = function(evt) {
116 this._fitToScreen();
117 var thisSlider = this;
118 addListener(window, 'resize', function(evt){thisSlider._fitToScreen();});
119 };
120
121 FilmSlider.prototype._fitToScreen = function(evt) {
122 var wh = getWindowHeight();
123 var rb = getObjectTop(this.rail) + getObjectHeight(this.rail); // rail bottom
124 var delta = wh - rb;
125 var sh = getObjectHeight(this.stretchable);
126 var newSize = sh + delta;
127 this.stretchable.style.height = newSize + 'px';
128
129 var ratio = this.image.height / this.image.width;
130 var bestFitSize = this.getBestFitSize(ratio);
131 var currentSize = parseInt(imgRequestedSize.exec(this.image.src)[1], 10);
132 if (currentSize !== bestFitSize) {
133 var src = this.image.src.replace(imgRequestedSize, 'size=' + bestFitSize);
134 this.pendingImage.src = src;
135 }
136 };
137
138 FilmSlider.prototype.getBestFitSize = function(ratio) {
139 var fw = getObjectWidth(this.stretchable) - 1;
140 var fh = getObjectHeight(this.stretchable) - 1;
141
142 var i, irw, irh;
143 if (ratio < 1) {
144 for (i=DEFAULT_IMAGE_SIZES.length -1 ; i>0 ; i--) {
145 irw = DEFAULT_IMAGE_SIZES[i];
146 irh = irw * ratio;
147 if (irw <= fw && irh <= fh)
148 break;
149 }
150 }
151 else {
152 for (i=DEFAULT_IMAGE_SIZES.length -1 ; i>0 ; i--) {
153 irh = DEFAULT_IMAGE_SIZES[i];
154 irw = irh / ratio;
155 if (irw <= fw && irh <= fh)
156 break;
157 }
158 }
159 return DEFAULT_IMAGE_SIZES[i];
160 };
161
162 FilmSlider.prototype.centerSlide = function(slideIndex) {
163 if (this.sliderRatio > 1) { return; }
164 var filmBarWidth = getObjectWidth(this.filmBar);
165 var x = slideIndex * this.slideSize
166 x = x - (filmBarWidth - this.slideSize) / 2.0;
167 x = x * this.sliderSpeedRatio;
168 var p = new Point( -x, 0 )
169 this.setSliderPosition(p);
170 };
171
172 FilmSlider.prototype.setSliderPosition = function(point) {
173 if(point.x < 0) { point.x = 0; }
174 if (point.x > this.maxRightPosition) { point.x = this.maxRightPosition; }
175 this.slider.style.left = point.x + 'px';
176 this.setFilmPosition(point);
177 };
178
179 FilmSlider.prototype.setFilmPosition = function(point) {
180 this.film.style.left = point.x / this.sliderSpeedRatio + 'px';
181 };
182
183 FilmSlider.prototype.getSliderPosition = function() {
184 var x = parseInt(this.slider.style.left);
185 var y = parseInt(this.slider.style.top);
186 var p = new Point(x, y);
187 return p;
188 };
189
190 FilmSlider.prototype.getFilmPosition = function() {
191 var x = parseInt(this.film.style.left);
192 var y = parseInt(this.film.style.top);
193 var p = new Point(x, y);
194 return p;
195 };
196
197 FilmSlider.prototype.loadSibling = function(previous) {
198 var slide = null;
199 if (previous) {
200 slide = this.selectedSlide.parentNode.previousSibling;
201 if (slide && slide.nodeType===3) { slide = slide.previousSibling; }
202 }
203 else {
204 slide = this.selectedSlide.parentNode.nextSibling;
205 if (slide && slide.nodeType===3) { slide = slide.nextSibling; }
206 }
207
208 if (!slide) { return; }
209 else {
210 var target = slide.getElementsByTagName('a')[0];
211 raiseMouseEvent(target, 'click');
212 var index = parseInt(target.getAttribute('portfolio:position'));
213 this.centerSlide(index);
214 }
215 };
216
217 FilmSlider.prototype.addEventListeners = function() {
218 var thisSlider = this;
219 addListener(window, 'resize', function(evt){thisSlider.resizeSlider(evt);});
220 addListener(this.filmBar, 'click', function(evt){thisSlider.thumbnailClickHandler(evt);});
221 addListener(this.toolbar, 'click', function(evt){thisSlider.toolbarClickHandler(evt);});
222 addListener(window, 'load', function(evt){thisSlider.fitToScreen(evt);});
223
224 // dd listeners
225 addListener(this.slider, 'mousedown', this.ddHandlers['down']);
226 if(browser.isDOM2Event){
227 if (browser.isAppleWebKit) {
228 this.filmBar.addEventListener('mousewheel', function(evt){thisSlider.mouseWheelHandler(evt);}, false);
229 }
230 else {
231 addListener(this.filmBar, 'DOMMouseScroll', function(evt){thisSlider.mouseWheelHandler(evt);});
232 }
233 }
234 else if (browser.isIE6up) {
235 addListener(this.filmBar, 'mousewheel', function(evt){thisSlider.mouseWheelHandler(evt);});
236 }
237
238 addListener(document, 'keydown', function(evt){thisSlider.keyDownHandler(evt);});
239 addListener(document, 'keypress', function(evt){thisSlider.keyPressHandler(evt);});
240 };
241
242
243 FilmSlider.prototype.mouseDownHandler = function(evt) {
244 this.initialClickPoint = new Point(evt.clientX, evt.clientY);
245 this.initialPosition = this.getSliderPosition();
246 this.dragInProgress = true;
247 addListener(document, 'mousemove', this.ddHandlers['move']);
248 addListener(document, 'mouseup', this.ddHandlers['up']);
249 addListener(document.body, 'mouseout', this.ddHandlers['out'])
250
251 };
252
253
254 FilmSlider.prototype.mouseMoveHandler = function(evt) {
255 if(!this.dragInProgress) { return; }
256
257 clearSelection();
258 evt = getEventObject(evt);
259 var currentPoint = new Point(evt.clientX, evt.clientY);
260 var displacement = currentPoint.diff(this.initialClickPoint);
261 this.setSliderPosition(this.initialPosition.add(displacement));
262 };
263
264 FilmSlider.prototype.mouseUpHandler = function(evt) {
265 this.dragInProgress = false;
266 evt = getEventObject(evt);
267 this.mouseMoveHandler(evt);
268 };
269
270
271 FilmSlider.prototype.mouseOutHandler = function(evt) {
272 evt = getEventObject(evt);
273 var x = evt.clientX;
274 var y = evt.clientY;
275 if (x < 0 ||
276 x > this.winSize['width'] ||
277 y < 0 ||
278 y > this.winSize['height']
279 ) {
280 this.mouseUpHandler(evt);
281 }
282 };
283
284 FilmSlider.prototype.thumbnailClickHandler = function(evt) {
285 var target = getTargetedObject(evt);
286 while (target.tagName !== 'A' && target !== this.filmBar)
287 target = target.parentNode;
288 if (target.tagName !== 'A') { return; }
289 else {
290 if (this.viewMode === 'full') {
291 this.mosaique.unload();
292 this.mosaique = null;
293 this.viewMode = 'medium';
294 }
295 disableDefault(evt);
296 disablePropagation(evt);
297 target.blur();
298 history.pushState(target.href, '', target.href);
299
300 var imgBaseUrl = target.href;
301 var canonicalImgUrl;
302 if (this.ctxUrlTranslation[0]) {
303 canonicalImgUrl = imgBaseUrl.replace(this.ctxUrlTranslation[0],
304 this.ctxUrlTranslation[1]);
305 }
306 else { canonicalImgUrl = imgBaseUrl; }
307
308 var ajaxUrl = imgBaseUrl + '/photo_view_ajax';
309 var thisFS = this;
310
311 //this.pendingImage.src = canonicalImgUrl + '/getResizedImage?size=600';
312 var thumbnail = target.getElementsByTagName('IMG')[0];
313 var bestFitSize = this.getBestFitSize(thumbnail.height/thumbnail.width);
314 this.pendingImage.src = canonicalImgUrl + '/getResizedImage?size=' + bestFitSize;
315
316 // update buttons
317 var fullScreenLink = this.buttons['full_screen'].parentNode;
318 fullScreenLink.href = canonicalImgUrl + '/zoom_view';
319
320 var toggleSelectionBtn = this.buttons['toggle_selection'];
321 var toggleSelectionLink = toggleSelectionBtn.parentNode;
322 this.selectedSlideInSelection = (target.className==='selected');
323 if (this.selectedSlideInSelection) {
324 toggleSelectionBtn.src = portal_url() + '/unselect_flag_btn.gif';
325 toggleSelectionBtn.alt = toggleSelectionLink.title = 'Retirer de la sélection';
326 toggleSelectionLink.href = canonicalImgUrl + '/remove_to_selection';
327 }
328 else {
329 toggleSelectionBtn.src = portal_url() + '/select_flag_btn.gif';
330 toggleSelectionBtn.alt = toggleSelectionLink.title = 'Ajouter à la sélection';
331 toggleSelectionLink.href = canonicalImgUrl + '/add_to_selection';
332 }
333
334 var showBuyableButtonLink = this.buttons['show_buyable'].parentNode;
335 showBuyableButtonLink.href = canonicalImgUrl + '/get_slide_buyable_items';
336 this.cartSlide.innerHTML = '';
337 this.cartSlide.style.visibility='hidden';
338
339
340 var metadataButton = this.buttons['edit_metadata']
341 if (metadataButton) {
342 var metadataEditLink = metadataButton.parentNode;
343 metadataEditLink.href = canonicalImgUrl + '/photo_edit_form'
344 }
345
346
347 var req = new XMLHttpRequest();
348 req.onreadystatechange = function() {
349 switch (req.readyState) {
350 case 1 :
351 showProgressImage();
352 break;
353 case 2 :
354 try {
355 if (! isTextMime.exec(req.getResponseHeader('Content-Type'))) {
356 req.onreadystatechange = null;
357 req.abort();
358 hideProgressImage();
359 window.location.href = thisFS._fallBackUrl;
360 }
361 }
362 catch(e){}
363 break;
364 case 4 :
365 hideProgressImage();
366 if (req.status === '200') { thisFS.populateViewer(req); }
367 // else
368 // //window.location.href = target.href;
369 // console.error(ajaxUrl);
370
371 };
372 };
373
374 req.open("GET", ajaxUrl, true);
375 req.send(null);
376
377 // update old displayed slide className
378 var className = this.selectedSlide.className;
379 var classes = className.split(' ');
380 var newClasses = [];
381 var name, i;
382
383 for (i in classes) {
384 name = classes[i];
385 if (name === 'displayed') { continue; }
386 else { newClasses.push(name); }
387 }
388
389 this.selectedSlide.className = newClasses.join(' ')
390
391 // hightlight new displayed slide
392 this.selectedSlide = target;
393 className = this.selectedSlide.className;
394 classes = className.split(' ');
395 classes.push('displayed');
396 this.selectedSlide.className = classes.join(' ');
397 }
398 };
399
400 FilmSlider.prototype.toolbarClickHandler = function(evt) {
401 var target = getTargetedObject(evt);
402 if(target.tagName === 'IMG' && target.getAttribute('name')) {
403 switch(target.getAttribute('name')) {
404 case 'previous' :
405 disableDefault(evt);
406 disablePropagation(evt);
407 var button = target;
408 var link = button.parentNode;
409 link.blur();
410 this.loadSibling(true);
411 break;
412 case 'next' :
413 disableDefault(evt);
414 disablePropagation(evt);
415 var button = target;
416 var link = button.parentNode;
417 link.blur();
418 this.loadSibling(false);
419 break;
420 case 'full_screen':
421 disableDefault(evt);
422 disablePropagation(evt);
423 target.parentNode.blur();
424 if (this.viewMode === 'full') {
425 this.mosaique.unload();
426 this.mosaique = null;
427 this.viewMode = 'medium';
428 return;
429 }
430 var main = document.getElementById('photo_viewer');
431 var url = target.parentNode.href;
432 url = url.substring(0, url.length - '/zoom_view'.length);
433 var margins = {'top':0, 'right':-1, 'bottom':0, 'left':0};
434 this.mosaique = new Mosaique(main, url, margins);
435 this.viewMode = 'full';
436 break;
437
438 case 'toggle_selection':
439 disableDefault(evt);
440 disablePropagation(evt);
441 var button = target;
442 var link = button.parentNode;
443 link.blur();
444
445 var req = new XMLHttpRequest();
446 var url = link.href;
447 req.open("POST", url, true);
448 req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
449 req.send("ajax=1");
450
451 // toggle button
452 var parts = url.split('/');
453 var canonicalImgUrl = parts.slice(0, parts.length-1).join('/');
454
455 if (isAddToSelection.test(url)) {
456 button.src = portal_url() + '/unselect_flag_btn.gif';
457 button.alt = link.title = 'Retirer de la sélection';
458 link.href = canonicalImgUrl + '/remove_to_selection';
459 this.selectedSlide.className = 'selected displayed';
460 this.image.parentNode.className = 'selected';
461 this.selectedSlideInSelection = true;
462 }
463 else {
464 button.src = portal_url() + '/select_flag_btn.gif';
465 button.alt = link.title = 'Ajouter à la sélection';
466 link.href = canonicalImgUrl + '/add_to_selection';
467 this.selectedSlide.className = 'displayed';
468 this.image.parentNode.className = '';
469 this.selectedSlideInSelection = false;
470 }
471 break;
472
473 case 'show_buyable':
474 disableDefault(evt);
475 disablePropagation(evt);
476 var button = target;
477 var link = button.parentNode;
478 link.blur();
479 var slide = this.cartSlide;
480 slide.innerHTML = '';
481 slide.style.visibility = 'visible';
482 var cw = new CartWidget(slide, link.href);
483 cw.onCancel = function() {
484 CartWidget.prototype.onCancel.apply(this);
485 slide.style.visibility = 'hidden';
486 };
487 cw.onAfterConfirm = function() {
488 slide.style.visibility = 'hidden';
489 };
490 break;
491
492
493
494
495 /*
496 case 'edit_metadata' :
497 disableDefault(evt);
498 disablePropagation(evt);
499 target.blur();
500 if (this.viewMode === 'full') {
501 this.mosaique.unload();
502 this.mosaique = null;
503 this.viewMode = 'medium';
504 return;
505 }
506 var fi = new FragmentImporter(absolute_url());
507 fi.useMacro('metadata_edit_form_macros', 'iptc', 'image_metadata');
508 break;
509 */
510 }
511 }
512 };
513
514
515 if(browser.isDOM2Event) {
516 if (browser.isAppleWebKit) {
517 FilmSlider.prototype.mouseWheelHandler = function(evt) {
518 disableDefault(evt);
519 var pos = this.getSliderPosition();
520 pos.x -= evt.wheelDelta / 40;
521 this.setSliderPosition(pos);
522 };
523 }
524 else {
525 FilmSlider.prototype.mouseWheelHandler = function(evt) {
526 disableDefault(evt);
527 var pos = this.getSliderPosition();
528 pos.x += evt.detail * 3;
529 this.setSliderPosition(pos);
530 };
531 }
532 }
533 else if (browser.isIE6up) {
534 FilmSlider.prototype.mouseWheelHandler = function() {
535 var evt = window.event;
536 evt.returnValue = false;
537 var pos = this.getSliderPosition();
538 pos.x -= evt.wheelDelta / 40;
539 this.setSliderPosition(pos);
540 };
541 }
542
543 FilmSlider.prototype.keyDownHandler = function(evt) {
544 var evt = getEventObject(evt);
545 switch (evt.keyCode) {
546 case keyLeft :
547 this.loadSibling(true);
548 break;
549 case keyRight :
550 this.loadSibling(false);
551 break;
552 default:
553 return;
554 }
555 };
556
557
558 FilmSlider.prototype.keyPressHandler = function(evt) {
559 var target = getTargetedObject(evt);
560 if (target.tagName === 'INPUT' || target.tagName === 'TEXTAREA') { return; }
561 var evt = getEventObject(evt);
562 var charPress = String.fromCharCode((evt.keyCode) ? evt.keyCode : evt.which);
563 switch(charPress) {
564 case 'f':
565 case 'F':
566 raiseMouseEvent(this.buttons['full_screen'], 'click');
567 break;
568 }
569 };
570
571 FilmSlider.prototype.populateViewer = function(req) {
572 var elements = req.responseXML.documentElement.childNodes;
573 for(var i=0 ; i < elements.length ; i++ ) {
574 element = elements[i];
575 switch (element.nodeName) {
576 case 'fragment' :
577 var dest = document.getElementById(element.getAttribute('id'));
578 if (dest) { dest.innerHTML = element.firstChild.nodeValue; }
579 break;
580 case 'imageattributes' :
581 var link = this.buttons['back_to_portfolio'].parentNode;
582 link.href = element.getAttribute('backToContextUrl');
583 link = this.buttons['show_buyable'].parentNode;
584 var buyable = element.getAttribute('buyable');
585 if(buyable === 'True') { link.className = null; }
586 else if(buyable === 'False') { link.className = 'hidden'; }
587 this.image.alt = element.getAttribute('alt');
588 this.updateBreadcrumbs(element.getAttribute('lastBcUrl'),
589 element.getAttribute('img_id'));
590 break;
591 }
592 }
593 };
594
595 FilmSlider.prototype.refreshImage = function() {
596 this.image.style.visibility = 'hidden';
597 this.image.src = this.pendingImage.src;
598 this.image.width = this.pendingImage.width;
599 this.image.height = this.pendingImage.height;
600 this.image.style.visibility = 'visible';
601 if (this.selectedSlideInSelection) { this.image.parentNode.className = 'selected'; }
602 else { this.image.parentNode.className = ''; }
603 };
604
605 FilmSlider.prototype.updateBreadcrumbs = function(url, title) {
606 if (this.hasBreadcrumbs) {
607 this.lastBCElement.href = element.getAttribute('lastBcUrl');
608 this.lastBCElement.innerHTML = element.getAttribute('img_id');
609 }
610 };
611
612 FilmSlider.prototype.startSlideShow = function() {
613 this.slideShowSlide = this.pendingSlideShowSlide = this.selectedSlide;
614 return this.slideShowSlide.href;
615 };
616
617 FilmSlider.prototype.slideShowNext = function() {
618 var nextSlide = this.slideShowSlide.parentNode.nextSibling;
619 if (nextSlide && nextSlide.nodeType===3) { nextSlide = nextSlide.nextSibling; }
620
621 if (nextSlide) {
622 nextSlide = nextSlide.getElementsByTagName('a')[0];
623 this.pendingSlideShowSlide = nextSlide;
624 return this.pendingSlideShowSlide.href;
625 }
626 else {
627 var row = this.slideShowSlide.parentNode.parentNode;
628 var first = row.firstChild;
629 if (first.nodeType===3)
630 first = first.nextSibling;
631 this.pendingSlideShowSlide = first.getElementsByTagName('a')[0];
632 return this.pendingSlideShowSlide.href;
633 }
634 };
635
636 FilmSlider.prototype.slideShowPrevious = function() {
637 var previousSlide = this.slideShowSlide.parentNode.previousSibling;
638 if (previousSlide && previousSlide.nodeType===3) { previousSlide = previousSlide.previousSibling; }
639
640 if (previousSlide) {
641 previousSlide = previousSlide.getElementsByTagName('a')[0];
642 this.pendingSlideShowSlide = previousSlide;
643 return this.pendingSlideShowSlide.href;
644 }
645 else {
646 var row = this.slideShowSlide.parentNode.parentNode;
647 var last = row.lastChild;
648 if (last.nodeType===3) { last = last.previousSibling; }
649 this.pendingSlideShowSlide = last.getElementsByTagName('a')[0];
650 return this.pendingSlideShowSlide.href;
651 }
652 };
653
654 FilmSlider.prototype.slideShowImageLoaded = function() {
655 this.slideShowSlide = this.pendingSlideShowSlide;
656 };
657
658 FilmSlider.prototype.stopSlideShow = function() {
659 raiseMouseEvent(this.slideShowSlide, 'click');
660 var index = parseInt(this.selectedSlide.getAttribute('portfolio:position'));
661 this.centerSlide(index);
662 };
663
664
665 /* UTILS */
666 function Point(x, y) {
667 this.x = Math.round(x);
668 this.y = Math.round(y);
669 }
670 Point.prototype.diff = function(point) { return new Point(this.x - point.x, this.y - point.y); };
671 Point.prototype.add = function(point) { return new Point(this.x + point.x, this.y + point.y); };
672 Point.prototype.mul = function(k) { return new Point(this.x * k, this.y *k)};
673 Point.prototype.toString = function() { return "(" + String(this.x) + ", " + String(this.y) + ")"; };
674
675 })();