├── .DS_Store
├── assets
├── video
│ └── demo.mov
├── images
│ └── sample.webp
└── styles
│ └── main.css
├── readme.md
├── index.html
├── app.js
└── LICENSE
/.DS_Store:
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https://raw.githubusercontent.com/felixfavour/camera-demo/HEAD/.DS_Store
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/assets/video/demo.mov:
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https://raw.githubusercontent.com/felixfavour/camera-demo/HEAD/assets/video/demo.mov
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/assets/images/sample.webp:
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https://raw.githubusercontent.com/felixfavour/camera-demo/HEAD/assets/images/sample.webp
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/readme.md:
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1 | # Camera Demo
2 | This application is one that explains how the media peripherals on any device can be interfaced natively using JavaScript.
3 |
4 | This repository was created to support an article that explains this code in detail.
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/index.html:
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/app.js:
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1 | const cameraVideoStream = document.getElementById('camera-stream')
2 | const shutterButton = document.getElementById('shutter')
3 | const photosButton = document.getElementById('photos-btn')
4 | const gallery = document.querySelector('.gallery-view')
5 | const currentImageElement = document.querySelector('.gallery-view img')
6 | const closeGalleryButton = document.getElementById('close-gallery')
7 | const nextButton = document.getElementById('next')
8 | const prevButton = document.getElementById('prev')
9 | const canvas = document.getElementById('canvas')
10 |
11 | let width = window.innerWidth
12 | let height = 0
13 | let streaming = false
14 |
15 | const capturedImages = []
16 | const currentImage = 0
17 |
18 | // Connect media device
19 | if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia({ video: true })) {
20 | navigator.mediaDevices.getUserMedia({ video: true }).then ((stream) => {
21 | cameraVideoStream.srcObject = stream
22 | cameraVideoStream.play()
23 | })
24 | }
25 |
26 | cameraVideoStream.addEventListener(
27 | "canplay",
28 | (ev) => {
29 | if (!streaming) {
30 | height = cameraVideoStream.videoHeight / (cameraVideoStream.videoWidth / width);
31 |
32 | if (isNaN(height)) {
33 | height = width / (4 / 3);
34 | }
35 |
36 | canvas.setAttribute("width", width);
37 | canvas.setAttribute("height", height);
38 | cameraVideoStream.setAttribute("width", width);
39 | cameraVideoStream.setAttribute("height", height);
40 | streaming = true;
41 | }
42 | },
43 | false
44 | );
45 |
46 | // Capture snapshots using HTML Canvas
47 | function captureImage () {
48 | const canvasContext = canvas.getContext('2d')
49 | canvas.width = width
50 | canvas.height = height
51 | canvasContext.drawImage(cameraVideoStream, 0, 0, width, height)
52 |
53 | // Convert captured data to image (base64)
54 | const data = canvas.toDataURL('image/png')
55 | currentImageElement.src = data
56 | photosButton.style.backgroundImage = `url(${data})`
57 | capturedImages.push(data)
58 | capturedImages.reverse()
59 |
60 | // Create new Image elements from array
61 | capturedImages.forEach((image) => {
62 |
63 | })
64 | }
65 |
66 | shutterButton.addEventListener('click', () => captureImage())
67 |
68 | // Event handlers to close and open gallery
69 | photosButton.addEventListener('click', () => {
70 | gallery.classList.add('show-gallery')
71 | currentImageElement.setAttribute('data-index', 0)
72 | })
73 | closeGalleryButton.addEventListener('click', () => gallery.classList.remove('show-gallery'))
74 |
75 | // Event handlers to browse gallery (next and previous)
76 | nextButton.addEventListener('click', () => {
77 | const index = Number(currentImageElement.getAttribute('data-index'))
78 | if (capturedImages[index + 1]) {
79 | currentImageElement.src = capturedImages[index + 1]
80 | currentImageElement.setAttribute('data-index', index + 1)
81 | }
82 | })
83 | prevButton.addEventListener('click', () => {
84 | const index = Number(currentImageElement.getAttribute('data-index'))
85 | if (capturedImages[index - 1]) {
86 | currentImageElement.src = capturedImages[index - 1]
87 | currentImageElement.setAttribute('data-index', index - 1)
88 | }
89 | })
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/assets/styles/main.css:
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1 | body {
2 | margin: 0;
3 | max-height: 100vh;
4 | overflow: hidden;
5 | }
6 | canvas {
7 | /* position: absolute;
8 | inset: 0; */
9 | display: none;
10 | }
11 | button {
12 | border: 0;
13 | outline: none;
14 | background: #00000070;
15 | color: #FFFFFF;
16 | padding: 4px 8px;
17 | height: 30px;
18 | min-width: 30px;
19 | border-radius: 24px;
20 | display: grid;
21 | place-items: center;
22 | cursor: pointer;
23 | transition: 0.3s ease-in;
24 | -webkit-transition: 0.3s ease-in;
25 | -moz-transition: 0.3s ease-in;
26 | -ms-transition: 0.3s ease-in;
27 | -o-transition: 0.3s ease-in;
28 | }
29 |
30 | /* Camera Container */
31 | .camera-ctn {
32 | position: relative;
33 | background: #000000;
34 | }
35 | .camera-view video {
36 | height: 100vh;
37 | width: 100vw;
38 | object-fit: cover;
39 | transform: scaleX(-1);
40 | }
41 |
42 | /* CAMERA BOTTOM */
43 | .camera-bottom {
44 | height: 250px;
45 | background: #00000050;
46 | position: absolute;
47 | inset: 0;
48 | top: auto;
49 | padding: 0 5%;
50 | display: grid;
51 | place-items: center;
52 | }
53 | .camera-bottom > .inner {
54 | display: grid;
55 | place-items: center;
56 | max-width: 500px;
57 | }
58 |
59 | /* LENS MODIFIER */
60 | .lens-modifier {
61 | display: flex;
62 | position: absolute;
63 | top: -50px;
64 | background: #00000070;
65 | color: #FFFFFF;
66 | border-radius: 24px;
67 | height: 30px;
68 | padding: 0 4px;
69 | }
70 | .lens-modifier button {
71 | background: transparent;
72 | font-weight: 700;
73 | }
74 | .lens-modifier button.active, .lens-modifier button:active {
75 | background: #FFFFFF;
76 | color: #000000;
77 | }
78 |
79 | /* MODES */
80 | .modes {
81 | display: flex;
82 | align-items: center;
83 | column-gap: 1rem;
84 | margin-bottom: 2rem;
85 | }
86 | .modes button {
87 | font-size: 1.15rem;
88 | font-weight: 300;
89 | background: transparent;
90 | }
91 | .modes button.active {
92 | background: #00000070;
93 | color: #FFFFFF;
94 | height: 40px;
95 | padding: 0 1rem;
96 | font-weight: 700;
97 | }
98 |
99 | /* SHUTTER CONTAINER */
100 | .shutter-ctn {
101 | display: flex;
102 | align-items: center;
103 | justify-content: space-around;
104 | width: 100%;
105 | }
106 | .previous-shots {
107 | background-position: center;
108 | background-size: cover;
109 | background-repeat: no-repeat;
110 | height: 55px;
111 | width: 55px;
112 | border-radius: 50%;
113 | }
114 | .shutter {
115 | height: 80px;
116 | width: 80px;
117 | background: #FFFFFF;
118 | border-radius: 50%;
119 | }
120 | .shutter:active {
121 | transform: scale(0.8);
122 | }
123 | .switch-device {
124 | height: 55px;
125 | width: 55px;
126 | border-radius: 50%;
127 | }
128 |
129 | /* GALLERY VIEW */
130 | .gallery-view {
131 | height: 100vh;
132 | width: 100vw;
133 | position: absolute;
134 | background: #000000;
135 | inset: 0;
136 | display: flex;
137 | justify-content: center;
138 | align-items: center;
139 | transition: 0.4s;
140 | transform: translateX(100vw);
141 | }
142 | .gallery-view.show-gallery {
143 | transform: translateX(0);
144 | }
145 | .gallery-view img {
146 | height: 100vh;
147 | object-fit: contain;
148 | }
149 | .gallery-view button {
150 | position: absolute;
151 | top: 45%;
152 | left: 5%;
153 | font-size: 1.2rem;
154 | }
155 | .gallery-view button#next {
156 | right: 5%;
157 | left: auto;
158 | }
159 | .gallery-view button#close-gallery {
160 | left: 5%;
161 | top: 5%;
162 | }
163 |
--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
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374 | reasonable ways as different from the original version; or
375 |
376 | d) Limiting the use for publicity purposes of names of licensors or
377 | authors of the material; or
378 |
379 | e) Declining to grant rights under trademark law for use of some
380 | trade names, trademarks, or service marks; or
381 |
382 | f) Requiring indemnification of licensors and authors of that
383 | material by anyone who conveys the material (or modified versions of
384 | it) with contractual assumptions of liability to the recipient, for
385 | any liability that these contractual assumptions directly impose on
386 | those licensors and authors.
387 |
388 | All other non-permissive additional terms are considered "further
389 | restrictions" within the meaning of section 10. If the Program as you
390 | received it, or any part of it, contains a notice stating that it is
391 | governed by this License along with a term that is a further
392 | restriction, you may remove that term. If a license document contains
393 | a further restriction but permits relicensing or conveying under this
394 | License, you may add to a covered work material governed by the terms
395 | of that license document, provided that the further restriction does
396 | not survive such relicensing or conveying.
397 |
398 | If you add terms to a covered work in accord with this section, you
399 | must place, in the relevant source files, a statement of the
400 | additional terms that apply to those files, or a notice indicating
401 | where to find the applicable terms.
402 |
403 | Additional terms, permissive or non-permissive, may be stated in the
404 | form of a separately written license, or stated as exceptions;
405 | the above requirements apply either way.
406 |
407 | 8. Termination.
408 |
409 | You may not propagate or modify a covered work except as expressly
410 | provided under this License. Any attempt otherwise to propagate or
411 | modify it is void, and will automatically terminate your rights under
412 | this License (including any patent licenses granted under the third
413 | paragraph of section 11).
414 |
415 | However, if you cease all violation of this License, then your
416 | license from a particular copyright holder is reinstated (a)
417 | provisionally, unless and until the copyright holder explicitly and
418 | finally terminates your license, and (b) permanently, if the copyright
419 | holder fails to notify you of the violation by some reasonable means
420 | prior to 60 days after the cessation.
421 |
422 | Moreover, your license from a particular copyright holder is
423 | reinstated permanently if the copyright holder notifies you of the
424 | violation by some reasonable means, this is the first time you have
425 | received notice of violation of this License (for any work) from that
426 | copyright holder, and you cure the violation prior to 30 days after
427 | your receipt of the notice.
428 |
429 | Termination of your rights under this section does not terminate the
430 | licenses of parties who have received copies or rights from you under
431 | this License. If your rights have been terminated and not permanently
432 | reinstated, you do not qualify to receive new licenses for the same
433 | material under section 10.
434 |
435 | 9. Acceptance Not Required for Having Copies.
436 |
437 | You are not required to accept this License in order to receive or
438 | run a copy of the Program. Ancillary propagation of a covered work
439 | occurring solely as a consequence of using peer-to-peer transmission
440 | to receive a copy likewise does not require acceptance. However,
441 | nothing other than this License grants you permission to propagate or
442 | modify any covered work. These actions infringe copyright if you do
443 | not accept this License. Therefore, by modifying or propagating a
444 | covered work, you indicate your acceptance of this License to do so.
445 |
446 | 10. Automatic Licensing of Downstream Recipients.
447 |
448 | Each time you convey a covered work, the recipient automatically
449 | receives a license from the original licensors, to run, modify and
450 | propagate that work, subject to this License. You are not responsible
451 | for enforcing compliance by third parties with this License.
452 |
453 | An "entity transaction" is a transaction transferring control of an
454 | organization, or substantially all assets of one, or subdividing an
455 | organization, or merging organizations. If propagation of a covered
456 | work results from an entity transaction, each party to that
457 | transaction who receives a copy of the work also receives whatever
458 | licenses to the work the party's predecessor in interest had or could
459 | give under the previous paragraph, plus a right to possession of the
460 | Corresponding Source of the work from the predecessor in interest, if
461 | the predecessor has it or can get it with reasonable efforts.
462 |
463 | You may not impose any further restrictions on the exercise of the
464 | rights granted or affirmed under this License. For example, you may
465 | not impose a license fee, royalty, or other charge for exercise of
466 | rights granted under this License, and you may not initiate litigation
467 | (including a cross-claim or counterclaim in a lawsuit) alleging that
468 | any patent claim is infringed by making, using, selling, offering for
469 | sale, or importing the Program or any portion of it.
470 |
471 | 11. Patents.
472 |
473 | A "contributor" is a copyright holder who authorizes use under this
474 | License of the Program or a work on which the Program is based. The
475 | work thus licensed is called the contributor's "contributor version".
476 |
477 | A contributor's "essential patent claims" are all patent claims
478 | owned or controlled by the contributor, whether already acquired or
479 | hereafter acquired, that would be infringed by some manner, permitted
480 | by this License, of making, using, or selling its contributor version,
481 | but do not include claims that would be infringed only as a
482 | consequence of further modification of the contributor version. For
483 | purposes of this definition, "control" includes the right to grant
484 | patent sublicenses in a manner consistent with the requirements of
485 | this License.
486 |
487 | Each contributor grants you a non-exclusive, worldwide, royalty-free
488 | patent license under the contributor's essential patent claims, to
489 | make, use, sell, offer for sale, import and otherwise run, modify and
490 | propagate the contents of its contributor version.
491 |
492 | In the following three paragraphs, a "patent license" is any express
493 | agreement or commitment, however denominated, not to enforce a patent
494 | (such as an express permission to practice a patent or covenant not to
495 | sue for patent infringement). To "grant" such a patent license to a
496 | party means to make such an agreement or commitment not to enforce a
497 | patent against the party.
498 |
499 | If you convey a covered work, knowingly relying on a patent license,
500 | and the Corresponding Source of the work is not available for anyone
501 | to copy, free of charge and under the terms of this License, through a
502 | publicly available network server or other readily accessible means,
503 | then you must either (1) cause the Corresponding Source to be so
504 | available, or (2) arrange to deprive yourself of the benefit of the
505 | patent license for this particular work, or (3) arrange, in a manner
506 | consistent with the requirements of this License, to extend the patent
507 | license to downstream recipients. "Knowingly relying" means you have
508 | actual knowledge that, but for the patent license, your conveying the
509 | covered work in a country, or your recipient's use of the covered work
510 | in a country, would infringe one or more identifiable patents in that
511 | country that you have reason to believe are valid.
512 |
513 | If, pursuant to or in connection with a single transaction or
514 | arrangement, you convey, or propagate by procuring conveyance of, a
515 | covered work, and grant a patent license to some of the parties
516 | receiving the covered work authorizing them to use, propagate, modify
517 | or convey a specific copy of the covered work, then the patent license
518 | you grant is automatically extended to all recipients of the covered
519 | work and works based on it.
520 |
521 | A patent license is "discriminatory" if it does not include within
522 | the scope of its coverage, prohibits the exercise of, or is
523 | conditioned on the non-exercise of one or more of the rights that are
524 | specifically granted under this License. You may not convey a covered
525 | work if you are a party to an arrangement with a third party that is
526 | in the business of distributing software, under which you make payment
527 | to the third party based on the extent of your activity of conveying
528 | the work, and under which the third party grants, to any of the
529 | parties who would receive the covered work from you, a discriminatory
530 | patent license (a) in connection with copies of the covered work
531 | conveyed by you (or copies made from those copies), or (b) primarily
532 | for and in connection with specific products or compilations that
533 | contain the covered work, unless you entered into that arrangement,
534 | or that patent license was granted, prior to 28 March 2007.
535 |
536 | Nothing in this License shall be construed as excluding or limiting
537 | any implied license or other defenses to infringement that may
538 | otherwise be available to you under applicable patent law.
539 |
540 | 12. No Surrender of Others' Freedom.
541 |
542 | If conditions are imposed on you (whether by court order, agreement or
543 | otherwise) that contradict the conditions of this License, they do not
544 | excuse you from the conditions of this License. If you cannot convey a
545 | covered work so as to satisfy simultaneously your obligations under this
546 | License and any other pertinent obligations, then as a consequence you may
547 | not convey it at all. For example, if you agree to terms that obligate you
548 | to collect a royalty for further conveying from those to whom you convey
549 | the Program, the only way you could satisfy both those terms and this
550 | License would be to refrain entirely from conveying the Program.
551 |
552 | 13. Use with the GNU Affero General Public License.
553 |
554 | Notwithstanding any other provision of this License, you have
555 | permission to link or combine any covered work with a work licensed
556 | under version 3 of the GNU Affero General Public License into a single
557 | combined work, and to convey the resulting work. The terms of this
558 | License will continue to apply to the part which is the covered work,
559 | but the special requirements of the GNU Affero General Public License,
560 | section 13, concerning interaction through a network will apply to the
561 | combination as such.
562 |
563 | 14. Revised Versions of this License.
564 |
565 | The Free Software Foundation may publish revised and/or new versions of
566 | the GNU General Public License from time to time. Such new versions will
567 | be similar in spirit to the present version, but may differ in detail to
568 | address new problems or concerns.
569 |
570 | Each version is given a distinguishing version number. If the
571 | Program specifies that a certain numbered version of the GNU General
572 | Public License "or any later version" applies to it, you have the
573 | option of following the terms and conditions either of that numbered
574 | version or of any later version published by the Free Software
575 | Foundation. If the Program does not specify a version number of the
576 | GNU General Public License, you may choose any version ever published
577 | by the Free Software Foundation.
578 |
579 | If the Program specifies that a proxy can decide which future
580 | versions of the GNU General Public License can be used, that proxy's
581 | public statement of acceptance of a version permanently authorizes you
582 | to choose that version for the Program.
583 |
584 | Later license versions may give you additional or different
585 | permissions. However, no additional obligations are imposed on any
586 | author or copyright holder as a result of your choosing to follow a
587 | later version.
588 |
589 | 15. Disclaimer of Warranty.
590 |
591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
599 |
600 | 16. Limitation of Liability.
601 |
602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
610 | SUCH DAMAGES.
611 |
612 | 17. Interpretation of Sections 15 and 16.
613 |
614 | If the disclaimer of warranty and limitation of liability provided
615 | above cannot be given local legal effect according to their terms,
616 | reviewing courts shall apply local law that most closely approximates
617 | an absolute waiver of all civil liability in connection with the
618 | Program, unless a warranty or assumption of liability accompanies a
619 | copy of the Program in return for a fee.
620 |
621 | END OF TERMS AND CONDITIONS
622 |
623 | How to Apply These Terms to Your New Programs
624 |
625 | If you develop a new program, and you want it to be of the greatest
626 | possible use to the public, the best way to achieve this is to make it
627 | free software which everyone can redistribute and change under these terms.
628 |
629 | To do so, attach the following notices to the program. It is safest
630 | to attach them to the start of each source file to most effectively
631 | state the exclusion of warranty; and each file should have at least
632 | the "copyright" line and a pointer to where the full notice is found.
633 |
634 |
635 | Copyright (C)
636 |
637 | This program is free software: you can redistribute it and/or modify
638 | it under the terms of the GNU General Public License as published by
639 | the Free Software Foundation, either version 3 of the License, or
640 | (at your option) any later version.
641 |
642 | This program is distributed in the hope that it will be useful,
643 | but WITHOUT ANY WARRANTY; without even the implied warranty of
644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
645 | GNU General Public License for more details.
646 |
647 | You should have received a copy of the GNU General Public License
648 | along with this program. If not, see .
649 |
650 | Also add information on how to contact you by electronic and paper mail.
651 |
652 | If the program does terminal interaction, make it output a short
653 | notice like this when it starts in an interactive mode:
654 |
655 | Copyright (C)
656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
657 | This is free software, and you are welcome to redistribute it
658 | under certain conditions; type `show c' for details.
659 |
660 | The hypothetical commands `show w' and `show c' should show the appropriate
661 | parts of the General Public License. Of course, your program's commands
662 | might be different; for a GUI interface, you would use an "about box".
663 |
664 | You should also get your employer (if you work as a programmer) or school,
665 | if any, to sign a "copyright disclaimer" for the program, if necessary.
666 | For more information on this, and how to apply and follow the GNU GPL, see
667 | .
668 |
669 | The GNU General Public License does not permit incorporating your program
670 | into proprietary programs. If your program is a subroutine library, you
671 | may consider it more useful to permit linking proprietary applications with
672 | the library. If this is what you want to do, use the GNU Lesser General
673 | Public License instead of this License. But first, please read
674 | .
675 |
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