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348 lines
10 KiB
JavaScript
348 lines
10 KiB
JavaScript
/**
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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 { Color } from "../util/Color.js";
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import { ColorMixin } from "../util/ColorMixin.js";
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import { to_pixiPoint } from "../util/Pixi.js";
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import * as util from "../util/Util.js";
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import { VisualStim } from "./VisualStim.js";
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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 = 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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