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14 KiB
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<title>JSDoc: Source: visual/ImageStim.js</title>
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<h1 class="page-title">Source: visual/ImageStim.js</h1>
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<pre class="prettyprint source linenums"><code>/**
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* Image Stimulus.
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*
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* @author Alain Pitiot
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* @version 2021.2.0
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* @copyright (c) 2017-2020 Ilixa Ltd. (http://ilixa.com) (c) 2020-2021 Open Science Tools Ltd. (https://opensciencetools.org)
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* @license Distributed under the terms of the MIT License
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*/
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import * as PIXI from 'pixi.js-legacy';
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import {VisualStim} from './VisualStim';
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import {Color} from '../util/Color';
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import {ColorMixin} from '../util/ColorMixin';
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import * as util from '../util/Util';
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/**
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* Image Stimulus.
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*
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* @name module:visual.ImageStim
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* @class
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* @extends VisualStim
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* @mixes ColorMixin
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* @param {Object} options
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* @param {String} options.name - the name used when logging messages from this stimulus
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* @param {Window} options.win - the associated Window
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* @param {string | HTMLImageElement} options.image - the name of the image resource or the HTMLImageElement corresponding to the image
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* @param {string | HTMLImageElement} options.mask - the name of the mask resource or HTMLImageElement corresponding to the mask
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* @param {string} [options.units= "norm"] - the units of the stimulus (e.g. for size, position, vertices)
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* @param {Array.<number>} [options.pos= [0, 0]] - the position of the center of the stimulus
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* @param {string} [options.units= 'norm'] - the units of the stimulus vertices, size and position
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* @param {number} [options.ori= 0.0] - the orientation (in degrees)
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* @param {number} [options.size] - the size of the rendered image (the size of the image will be used if size is not specified)
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* @param {Color} [options.color= 'white'] the background color
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* @param {number} [options.opacity= 1.0] - the opacity
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* @param {number} [options.contrast= 1.0] - the contrast
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* @param {number} [options.depth= 0] - the depth (i.e. the z order)
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* @param {number} [options.texRes= 128] - the resolution of the text
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* @param {boolean} [options.interpolate= false] - whether or not the image is interpolated
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* @param {boolean} [options.flipHoriz= false] - whether or not to flip horizontally
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* @param {boolean} [options.flipVert= false] - whether or not to flip vertically
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* @param {boolean} [options.autoDraw= false] - whether or not the stimulus should be automatically drawn on every frame flip
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* @param {boolean} [options.autoLog= false] - whether or not to log
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*/
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export class ImageStim extends util.mix(VisualStim).with(ColorMixin)
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{
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constructor({name, win, image, mask, pos, units, ori, size, color, opacity, contrast, texRes, depth, interpolate, flipHoriz, flipVert, autoDraw, autoLog} = {})
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{
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super({name, win, units, ori, opacity, depth, pos, size, autoDraw, autoLog});
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this._addAttribute(
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'image',
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image
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);
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this._addAttribute(
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'mask',
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mask
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);
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this._addAttribute(
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'color',
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color,
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'white',
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this._onChange(true, false)
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);
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this._addAttribute(
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'contrast',
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contrast,
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1.0,
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this._onChange(true, false)
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);
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this._addAttribute(
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'texRes',
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texRes,
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128,
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this._onChange(true, false)
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);
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this._addAttribute(
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'interpolate',
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interpolate,
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false,
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this._onChange(true, false)
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);
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this._addAttribute(
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'flipHoriz',
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flipHoriz,
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false,
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this._onChange(false, false)
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);
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this._addAttribute(
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'flipVert',
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flipVert,
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false,
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this._onChange(false, false)
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);
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// estimate the bounding box:
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this._estimateBoundingBox();
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if (this._autoLog)
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{
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this._psychoJS.experimentLogger.exp(`Created ${this.name} = ${this.toString()}`);
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}
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}
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/**
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* Setter for the image attribute.
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*
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* @name module:visual.ImageStim#setImage
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* @public
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* @param {HTMLImageElement | string} image - the name of the image resource or HTMLImageElement corresponding to the image
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* @param {boolean} [log= false] - whether of not to log
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*/
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setImage(image, log = false)
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{
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const response = {
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origin: 'ImageStim.setImage',
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context: 'when setting the image of ImageStim: ' + this._name
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};
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try
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{
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// image is undefined: that's fine but we raise a warning in case this is a symptom of an actual problem
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if (typeof image === 'undefined')
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{
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this.psychoJS.logger.warn('setting the image of ImageStim: ' + this._name + ' with argument: undefined.');
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this.psychoJS.logger.debug('set the image of ImageStim: ' + this._name + ' as: undefined');
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}
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else
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{
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// image is a string: it should be the name of a resource, which we load
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if (typeof image === 'string')
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{
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image = this.psychoJS.serverManager.getResource(image);
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}
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// image should now be an actual HTMLImageElement: we raise an error if it is not
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if (!(image instanceof HTMLImageElement))
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{
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throw 'the argument: ' + image.toString() + ' is not an image" }';
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}
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this.psychoJS.logger.debug('set the image of ImageStim: ' + this._name + ' as: src= ' + image.src + ', size= ' + image.width + 'x' + image.height);
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}
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const existingImage = this.getImage();
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const hasChanged = existingImage ? existingImage.src !== image.src : true;
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this._setAttribute('image', image, log);
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if (hasChanged)
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{
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this._onChange(true, true)();
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}
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}
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catch (error)
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{
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throw Object.assign(response, {error});
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}
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}
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/**
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* Setter for the mask attribute.
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*
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* @name module:visual.ImageStim#setMask
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* @public
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* @param {HTMLImageElement | string} mask - the name of the mask resource or HTMLImageElement corresponding to the mask
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* @param {boolean} [log= false] - whether of not to log
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*/
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setMask(mask, log = false)
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{
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const response = {
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origin: 'ImageStim.setMask',
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context: 'when setting the mask of ImageStim: ' + this._name
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};
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try
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{
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// mask is undefined: that's fine but we raise a warning in case this is a sympton of an actual problem
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if (typeof mask === 'undefined')
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{
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this.psychoJS.logger.warn('setting the mask of ImageStim: ' + this._name + ' with argument: undefined.');
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this.psychoJS.logger.debug('set the mask of ImageStim: ' + this._name + ' as: undefined');
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}
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else
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{
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// mask is a string: it should be the name of a resource, which we load
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if (typeof mask === 'string')
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{
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mask = this.psychoJS.serverManager.getResource(mask);
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}
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// mask should now be an actual HTMLImageElement: we raise an error if it is not
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if (!(mask instanceof HTMLImageElement))
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{
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throw 'the argument: ' + mask.toString() + ' is not an image" }';
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}
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this.psychoJS.logger.debug('set the mask of ImageStim: ' + this._name + ' as: src= ' + mask.src + ', size= ' + mask.width + 'x' + mask.height);
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}
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this._setAttribute('mask', mask, log);
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this._onChange(true, false)();
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}
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catch (error)
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{
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throw Object.assign(response, {error});
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}
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}
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/**
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* Estimate the bounding box.
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*
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* @name module:visual.ImageStim#_estimateBoundingBox
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* @function
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* @override
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* @protected
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*/
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_estimateBoundingBox()
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{
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const size = this._getDisplaySize();
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if (typeof size !== 'undefined')
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{
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this._boundingBox = new PIXI.Rectangle(
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this._pos[0] - size[0] / 2,
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this._pos[1] - size[1] / 2,
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size[0],
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size[1]
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);
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}
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// TODO take the orientation into account
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}
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/**
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* Update the stimulus, if necessary.
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*
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* @name module:visual.ImageStim#_updateIfNeeded
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* @private
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*/
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_updateIfNeeded()
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{
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if (!this._needUpdate)
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{
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return;
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}
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this._needUpdate = false;
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// update the PIXI representation, if need be:
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if (this._needPixiUpdate)
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{
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this._needPixiUpdate = false;
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if (typeof this._pixi !== 'undefined')
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{
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this._pixi.destroy(true);
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}
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this._pixi = undefined;
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// no image to draw: return immediately
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if (typeof this._image === 'undefined')
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{
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return;
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}
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const baseTexture = new PIXI.BaseTexture(this._image);
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this._texture = new PIXI.Texture(baseTexture);
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this._pixi = PIXI.Sprite.from(this._texture);
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// add a mask if need be:
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if (typeof this._mask !== 'undefined')
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{
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this._pixi.mask = PIXI.Sprite.from(this._mask);
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// a 0.5, 0.5 anchor is required for the mask to be aligned with the image
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this._pixi.mask.anchor.x = 0.5;
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this._pixi.mask.anchor.y = 0.5;
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this._pixi.addChild(this._pixi.mask);
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}
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// since _texture.width may not be immediately available but the rest of the code needs its value
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// we arrange for repeated calls to _updateIfNeeded until we have a width:
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if (this._texture.width === 0)
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{
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this._needUpdate = true;
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this._needPixiUpdate = true;
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return;
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}
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// const colorFilter = new PIXI.filters.ColorMatrixFilter();
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// colorFilter.matrix[0] = 2;
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// colorFilter.matrix[6] = 1;
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// colorFilter.matrix[12] = 1;
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// // colorFilter.alpha = 1;
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// colorFilter.blendMode = PIXI.BLEND_MODES.MULTIPLY;
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// console.log(colorFilter.matrix);
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// this._pixi.filters = [colorFilter];
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}
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this._pixi.zIndex = this._depth;
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this._pixi.alpha = this.opacity;
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// set the scale:
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const displaySize = this._getDisplaySize();
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const size_px = util.to_px(displaySize, this.units, this.win);
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const scaleX = size_px[0] / this._texture.width;
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const scaleY = size_px[1] / this._texture.height;
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this._pixi.scale.x = this.flipHoriz ? -scaleX : scaleX;
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this._pixi.scale.y = this.flipVert ? scaleY : -scaleY;
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// set the position, rotation, and anchor (image centered on pos):
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this._pixi.position = util.to_pixiPoint(this.pos, this.units, this.win);
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this._pixi.rotation = this.ori * Math.PI / 180;
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this._pixi.anchor.x = 0.5;
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this._pixi.anchor.y = 0.5;
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// re-estimate the bounding box, as the texture's width may now be available:
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this._estimateBoundingBox();
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}
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/**
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* Get the size of the display image, which is either that of the ImageStim or that of the image
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* it contains.
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*
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* @name module:visual.ImageStim#_getDisplaySize
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* @private
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* @return {number[]} the size of the displayed image
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*/
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_getDisplaySize()
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{
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let displaySize = this.size;
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if (typeof displaySize === 'undefined')
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{
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// use the size of the texture, if we have access to it:
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if (typeof this._texture !== 'undefined' && this._texture.width > 0)
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{
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const textureSize = [this._texture.width, this._texture.height];
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displaySize = util.to_unit(textureSize, 'pix', this.win, this.units);
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}
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}
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return displaySize;
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}
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}
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</code></pre>
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</article>
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</section>
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<h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-core.html">core</a></li><li><a href="module-data.html">data</a></li><li><a href="module-sound.html">sound</a></li><li><a href="module-util.html">util</a></li><li><a href="module-visual.html">visual</a></li></ul><h3>Classes</h3><ul><li><a href="module-core.BuilderKeyResponse.html">BuilderKeyResponse</a></li><li><a href="module-core.EventManager.html">EventManager</a></li><li><a href="module-core.GUI.html">GUI</a></li><li><a href="module-core.Keyboard.html">Keyboard</a></li><li><a href="module-core.KeyPress.html">KeyPress</a></li><li><a href="module-core.Logger.html">Logger</a></li><li><a href="module-core.MinimalStim.html">MinimalStim</a></li><li><a href="module-core.Mouse.html">Mouse</a></li><li><a href="module-core.PsychoJS.html">PsychoJS</a></li><li><a href="module-core.ServerManager.html">ServerManager</a></li><li><a href="module-core.Window.html">Window</a></li><li><a href="module-data.ExperimentHandler.html">ExperimentHandler</a></li><li><a href="module-data.TrialHandler.html">TrialHandler</a></li><li><a href="module-sound.AudioClip.html">AudioClip</a></li><li><a href="module-sound.AudioClipPlayer.html">AudioClipPlayer</a></li><li><a href="module-sound.Microphone.html">Microphone</a></li><li><a href="module-sound.Sound.html">Sound</a></li><li><a href="module-sound.TonePlayer.html">TonePlayer</a></li><li><a href="module-sound.TrackPlayer.html">TrackPlayer</a></li><li><a href="module-util.Clock.html">Clock</a></li><li><a href="module-util.Color.html">Color</a></li><li><a href="module-util.CountdownTimer.html">CountdownTimer</a></li><li><a href="module-util.EventEmitter.html">EventEmitter</a></li><li><a href="module-util.MixinBuilder.html">MixinBuilder</a></li><li><a href="module-util.MonotonicClock.html">MonotonicClock</a></li><li><a href="module-util.PsychObject.html">PsychObject</a></li><li><a href="module-util.Scheduler.html">Scheduler</a></li><li><a href="module-visual.ButtonStim.html">ButtonStim</a></li><li><a href="module-visual.Form.html">Form</a></li><li><a href="module-visual.ImageStim.html">ImageStim</a></li><li><a href="module-visual.MovieStim.html">MovieStim</a></li><li><a href="module-visual.Polygon.html">Polygon</a></li><li><a href="module-visual.Rect.html">Rect</a></li><li><a href="module-visual.ShapeStim.html">ShapeStim</a></li><li><a href="module-visual.Slider.html">Slider</a></li><li><a href="module-visual.TextBox.html">TextBox</a></li><li><a href="module-visual.TextStim.html">TextStim</a></li><li><a href="module-visual.VisualStim.html">VisualStim</a></li></ul><h3>Interfaces</h3><ul><li><a href="module-sound.SoundPlayer.html">SoundPlayer</a></li></ul><h3>Mixins</h3><ul><li><a href="module-core.WindowMixin.html">WindowMixin</a></li><li><a href="module-util.ColorMixin.html">ColorMixin</a></li></ul>
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