38
DrawingArea
Objective
- Responder
- View
- DrawingArea
- View
Dans la console du navigateur, affichez les valeurs de toutes les options :
canvas.getOptions()
Object { size: (2) […], hflip: false, vflip: false, grayscale: false, sepia: false, blur: false, invert: 0, contrast: 1, saturate: 1, brightness: 1, … }
Modifiez quelques valeurs du filtre du canevas :
canvas.sepia=true
canvas.sepia=false
canvas.hflip=true
canvas.opacity=0.5
canvas.opacity=1
Changez la taille du canevas :
canvas.size=[640,360]
Éditez le fichier testDrawingArea.phtml dans le dossier tests :
- <?php $tagname='img'; ?>
Mettez la variable PHP $tagname
à la valeur 'video'
.
Rechargez la page.
Essayez la valeur 'canvas'
.
- function DrawingArea() {
- View.call(this);
- this._width = this._height = 0;
- this._hflip = this._vflip = false;
- this._grayscale = this._sepia = this._blur = false;
- this._contrast = this._saturate = this._brightness = 1;
- this._invert = 0;
- this._opacity = 1;
- this._ctx = null;
- this._image = null;
- }
- DrawingArea.prototype = Object.create(View.prototype);
- Object.defineProperty(DrawingArea.prototype, 'constructor', { value: DrawingArea, enumerable: false, writable: true });
- Object.defineProperty(DrawingArea.prototype, 'size', {
- get: function() {
- return [this._width, this._height];
- },
- set: function(size) {
- if (! (Array.isArray(size) && size.length == 2))
- throw new TypeError();
- const [width, height] = size;
- if (! (Number.isInteger(width) && Number.isInteger(height)))
- throw new TypeError();
- if (width < 0 || height < 0)
- throw new RangeError();
- if (this._width != width || this._height != height) {
- this._width = width;
- this._height = height;
- if (this.interfaced()) {
- this._ctxTransform();
- this._drawImage();
- }
- }
- }
- });
- Object.defineProperty(DrawingArea.prototype, 'hflip', {
- get: function() {
- return this._hflip;
- },
- set: function(hflip) {
- if (this._hflip != hflip) {
- this._hflip = hflip ? true : false;
- if (this.interfaced()) {
- this._ctxTransform();
- this._drawImage();
- }
- }
- }
- });
- Object.defineProperty(DrawingArea.prototype, 'vflip', {
- get: function() {
- return this._vflip;
- },
- set: function(vflip) {
- if (this._vflip != vflip) {
- this._vflip = vflip ? true : false;
- if (this.interfaced()) {
- this._ctxTransform();
- this._drawImage();
- }
- }
- }
- });
- Object.defineProperty(DrawingArea.prototype, 'grayscale', {
- get: function() {
- return this._grayscale;
- },
- set: function(grayscale) {
- if (this._grayscale != grayscale) {
- this._grayscale = grayscale ? true : false;
- if (this.interfaced()) {
- this._ctxFilter();
- this._drawImage();
- }
- }
- }
- });
- Object.defineProperty(DrawingArea.prototype, 'sepia', {
- get: function() {
- return this._sepia;
- },
- set: function(sepia) {
- if (this._sepia != sepia) {
- this._sepia = sepia ? true : false;
- if (this.interfaced()) {
- this._ctxFilter();
- this._drawImage();
- }
- }
- }
- });
- Object.defineProperty(DrawingArea.prototype, 'blur', {
- get: function() {
- return this._blur;
- },
- set: function(blur) {
- if (this._blur != blur) {
- this._blur = blur ? true : false;
- if (this.interfaced()) {
- this._ctxFilter();
- this._drawImage();
- }
- }
- }
- });
- Object.defineProperty(DrawingArea.prototype, 'invert', {
- get: function() {
- return this._invert;
- },
- set: function(invert) {
- if (typeof invert !== 'number')
- throw new TypeError();
- if (invert < 0 || invert > 1)
- throw new RangeError();
- if (this._invert != invert) {
- this._invert = invert;
- if (this.interfaced()) {
- this._ctxFilter();
- this._drawImage();
- }
- }
- }
- });
- Object.defineProperty(DrawingArea.prototype, 'contrast', {
- get: function() {
- return this._contrast;
- },
- set: function(contrast) {
- if (typeof contrast !== 'number')
- throw new TypeError();
- if (contrast < 0)
- throw new RangeError();
- if (this._contrast != contrast) {
- this._contrast = contrast;
- if (this.interfaced()) {
- this._ctxFilter();
- this._drawImage();
- }
- }
- }
- });
- Object.defineProperty(DrawingArea.prototype, 'saturate', {
- get: function() {
- return this._saturate;
- },
- set: function(saturate) {
- if (typeof saturate !== 'number')
- throw new TypeError();
- if (saturate < 0)
- throw new RangeError();
- if (this._saturate != saturate) {
- this._saturate = saturate;
- if (this.interfaced()) {
- this._ctxFilter();
- this._drawImage();
- }
- }
- }
- });
- Object.defineProperty(DrawingArea.prototype, 'brightness', {
- get: function() {
- return this._brightness;
- },
- set: function(brightness) {
- if (typeof brightness !== 'number')
- throw new TypeError();
- if (brightness < 0)
- throw new RangeError();
- if (this._brightness != brightness) {
- this._brightness = brightness;
- if (this.interfaced()) {
- this._ctxFilter();
- this._drawImage();
- }
- }
- }
- });
- Object.defineProperty(DrawingArea.prototype, 'opacity', {
- get: function() {
- return this._opacity;
- },
- set: function(opacity) {
- if (typeof opacity !== 'number')
- throw new TypeError();
- if (opacity < 0 || opacity > 1)
- throw new RangeError();
- if (this._opacity != opacity) {
- this._opacity = opacity;
- if (this.interfaced()) {
- this._ctxFilter();
- this._drawImage();
- }
- }
- }
- });
- DrawingArea.prototype.getOptions = function() {
- const options = {
- size: [this._width, this._height],
- hflip: this._hflip,
- vflip: this._vflip,
- grayscale: this._grayscale,
- sepia: this._sepia,
- blur: this._blur,
- invert: this._invert,
- contrast: this._contrast,
- saturate: this._saturate,
- brightness: this._brightness,
- opacity: this._opacity
- };
- return options;
- };
- DrawingArea.prototype.setOptions = function(options) {
- const {
- size = [this._width, this._height],
- hflip = this._hflip,
- vflip = this._vflip,
- grayscale = this._grayscale,
- sepia = this._sepia,
- blur = this._blur,
- invert = this._invert,
- contrast = this._contrast,
- saturate = this._saturate,
- brightness = this._brightness,
- opacity = this._opacity
- } = options || {};
- if (! (Array.isArray(size) && size.length == 2))
- throw new TypeError();
- const [width, height] = size;
- if (! (Number.isInteger(width) && Number.isInteger(height)))
- throw new TypeError();
- if (width < 0 || height < 0)
- throw new RangeError();
- this._width = width;
- this._height = height;
- this._hflip = hflip ? true : false;
- this._vflip = vflip ? true : false;
- this._grayscale = grayscale ? true : false;
- this._sepia = sepia ? true : false;
- this._blur = blur ? true : false;
- if (! (typeof invert === 'number' && typeof contrast === 'number' && typeof saturate === 'number' && typeof brightness === 'number' && typeof opacity === 'number'))
- throw new TypeError();
- if (invert < 0 || contrast < 0 || saturate < 0 || brightness < 0)
- throw new RangeError();
- if (opacity < 0 || opacity > 1)
- throw new RangeError();
- this._invert = invert;
- this._contrast = contrast;
- this._saturate = saturate;
- this._brightness = brightness;
- this._opacity = opacity;
- if (this.interfaced()) {
- this._ctxTransform();
- this._drawImage();
- }
- return this;
- };
- DrawingArea.prototype.erase = function() {
- if (this._widget && this._widget.width != 0 && this._widget.height != 0) {
- this._ctx.clearRect(0, 0, this._widget.width, this._widget.height);
- }
- return this;
- };
- DrawingArea.prototype.isBlank = function() {
- if (!this._widget || this._widget.width == 0 || this._widget.height == 0)
- return true;
- const imgdata = this._ctx.getImageData(0, 0, this._widget.width, this._widget.height);
- return imgdata ? !new Uint32Array(imgdata.data.buffer).some(color => color != 0) : true;
- };
- DrawingArea.prototype.setImage = function(w) {
- this._image = w;
- this._drawImage();
- return this;
- };
- DrawingArea.prototype.setWidget = function(w) {
- if (! (w.tagName == 'IMG' || w.tagName == 'VIDEO' || w.tagName == 'CANVAS'))
- throw new TypeError();
- const canvas = document.createElement('canvas');
- this._ctx = canvas.getContext('2d');
- View.prototype.setWidget.call(this, canvas);
- w.style.display = 'none';
- w.after(canvas);
- this._image = w;
- if (this._width == 0) {
- this._width = w.width;
- this._height = w.height;
- }
- this._ctxTransform();
- switch (w.tagName) {
- case 'IMG':
- w.addEventListener('load', () => this._drawImage(), { once: true });
- break;
- case 'VIDEO':
- w.addEventListener('loadeddata', () => this._drawImage(), { once: true });
- break;
- case 'CANVAS':
- default:
- this._drawImage();
- }
- return this;
- };
- DrawingArea.prototype._ctxFilter = function() {
- let filter = [];
- if (this._grayscale)
- filter.push('grayscale(1)');
- if (this._sepia)
- filter.push('sepia(1)');
- if (this._blur)
- filter.push('blur(8px)');
- if (this._invert != 0)
- filter.push(`invert(${this._invert})`);
- if (this._contrast != 1)
- filter.push(`contrast(${this._contrast})`);
- if (this._saturate != 1)
- filter.push(`saturate(${this._saturate})`);
- if (this._brightness != 1)
- filter.push(`brightness(${this._brightness})`);
- if (this._opacity != 1)
- filter.push(`opacity(${this._opacity})`);
- this._ctx.filter = filter.length ? filter.join(' ') : 'none';
- };
- DrawingArea.prototype._ctxTransform = function() {
- this._widget.width = this._width;
- this._widget.height = this._height;
- this._ctx.transform(this._hflip ? -1 : 1, 0, 0, this._vflip ? -1 : 1, this._hflip ? this._widget.width : 0, this._vflip ? this._widget.height : 0);
- this._ctxFilter();
- };
- DrawingArea.prototype._drawImage = function() {
- if (this._widget.width == 0 || this._widget.height == 0)
- return;
- this._ctx.clearRect(0, 0, this._widget.width, this._widget.height);
- this._ctx.drawImage(this._image, 0, 0, this._widget.width, this._widget.height);
- };
Test
- <?php $maxwidth=320; ?>
- <?php $tagname='img'; ?>
- switch ($tagname) {
- case 'img':
- $src='/files/images/htmlcssjs.jpg';
- $width=1280;
- $height=720;
- break;
- case 'video':
- $src='/files/videos/Horloge.webm';
- $type='video/webm';
- $width=854;
- $height=480;
- break;
- case 'canvas':
- $width=600;
- $height=$width;
- break;
- }
- <?php $id=uniqid('id'); ?>
- <div id="<?php echo $id; ?>" class="noprint">
- <div class="test_display">
- <?php if ($tagname == 'img'): ?>
- <img src="<?php echo $src; ?>" alt="" width="<?php echo $width; ?>" height="<?php echo $height; ?>" hidden/>
- <?php elseif ($tagname == 'video'): ?>
- <video width="<?php echo $width; ?>" height="<?php echo $height; ?>" preload="auto">
- <source src="<?php echo $src; ?>" type="<?php echo $type; ?>" />
- </video>
- <?php elseif ($tagname == 'canvas'): ?>
- <canvas width="<?php echo $width; ?>" height="<?php echo $height; ?>"></canvas>
- <?php endif; ?>
- </div>
- </div>
- <?php head('javascript', '/objectivejs/Objective.js'); ?>
- <?php head('javascript', '/objectivejs/Responder.js'); ?>
- <?php head('javascript', '/objectivejs/View.js'); ?>
- <?php head('javascript', '/objectivejs/DrawingArea.js'); ?>
- (function() {
- const canvas = document.querySelector('#<?php echo $id; ?> canvas');
- const ctx = canvas.getContext('2d');
- const w = canvas.width / 2;
- const h = canvas.height / 2;
- ctx.fillStyle = '#FD0';
- ctx.fillRect(0, 0, w, h);
- ctx.fillStyle = '#6C0';
- ctx.fillRect(w, 0, w, h);
- ctx.fillStyle = '#09F';
- ctx.fillRect(0, h, w, h);
- ctx.fillStyle = '#F30';
- ctx.fillRect(w, h, w, h);
- ctx.fillStyle = '#FFF';
- ctx.globalAlpha = 0.2;
- for (let i = 0; i < 7; i++) {
- ctx.beginPath();
- ctx.arc(w, h, w / 10 + h / 10 * i, 0, Math.PI * 2, true);
- ctx.fill();
- }
- })();
- const width = <?php echo $width; ?>;
- const height = <?php echo $height; ?>;
- const maxwidth = <?php echo $maxwidth; ?>;
- const ratio = Math.round(width / height * 100) / 100;
- const image = document.querySelector('#<?php echo $id; ?> <?php echo $tagname; ?>');
- const canvas = new DrawingArea();
- canvas.size = [maxwidth, Math.ceil(maxwidth / ratio)];
- canvas.setManagedWidget(image);
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