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583 lines
17 KiB
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<meta charset="utf-8">
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<title>JSDoc: Source: visual/TextStim.js</title>
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<h1 class="page-title">Source: visual/TextStim.js</h1>
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<section>
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<article>
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<pre class="prettyprint source linenums"><code>/**
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* Text 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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* @name module:visual.TextStim
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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 {module:core.Window} options.win - the associated Window
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* @param {string} [options.text="Hello World"] - the text to be rendered
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* @param {string} [options.font= "Arial"] - the font family
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* @param {Array.<number>} [options.pos= [0, 0]] - the position of the center of the text
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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.depth= 0] - the depth (i.e. the z order)
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* @param {number} [options.contrast= 1.0] - the contrast
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* @param {string} [options.units= "norm"] - the units of the text size and position
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* @param {number} options.ori - the orientation (in degrees)
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* @param {number} [options.height= 0.1] - the height of the text
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* @param {boolean} [options.bold= false] - whether or not the text is bold
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* @param {boolean} [options.italic= false] - whether or not the text is italic
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* @param {string} [options.alignHoriz = 'center'] - horizontal alignment
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* @param {string} [options.alignVert = 'center'] - vertical alignment
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* @param {boolean} options.wrapWidth - whether or not to wrap the text horizontally
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* @param {boolean} [options.flipHoriz= false] - whether or not to flip the text horizontally
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* @param {boolean} [options.flipVert= false] - whether or not to flip the text vertically
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* @param {PIXI.Graphics} [options.clipMask= null] - the clip mask
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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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* @todo vertical alignment, and orientation are currently NOT implemented
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*/
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export class TextStim extends util.mix(VisualStim).with(ColorMixin)
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{
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constructor(
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{
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name,
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win,
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text,
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font,
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pos,
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color,
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opacity,
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depth,
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contrast,
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units,
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ori,
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height,
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bold,
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italic,
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alignHoriz,
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alignVert,
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wrapWidth,
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flipHoriz,
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flipVert,
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clipMask,
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autoDraw,
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autoLog,
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} = {},
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)
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{
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super({ name, win, units, ori, opacity, depth, pos, clipMask, autoDraw, autoLog });
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// callback to deal with text metrics invalidation:
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const onChange = (withPixi = false, withBoundingBox = false, withMetrics = false) =>
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{
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const visualOnChange = this._onChange(withPixi, withBoundingBox);
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return () =>
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{
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visualOnChange();
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if (withMetrics)
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{
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this._textMetrics = undefined;
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}
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};
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};
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// text and font:
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this._addAttribute(
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"text",
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text,
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"Hello World",
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onChange(true, true, true),
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);
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this._addAttribute(
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"alignHoriz",
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alignHoriz,
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"center",
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onChange(true, true, true),
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);
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this._addAttribute(
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"alignVert",
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alignVert,
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"center",
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onChange(true, true, true),
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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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onChange(true, true, true),
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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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onChange(true, true, true),
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);
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this._addAttribute(
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"font",
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font,
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"Arial",
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this._onChange(true, true),
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);
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this._addAttribute(
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"height",
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height,
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this._getDefaultLetterHeight(),
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onChange(true, true, true),
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);
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this._addAttribute(
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"wrapWidth",
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wrapWidth,
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this._getDefaultWrapWidth(),
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onChange(true, true, true),
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);
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this._addAttribute(
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"bold",
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bold,
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false,
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onChange(true, true, true),
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);
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this._addAttribute(
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"italic",
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italic,
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false,
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onChange(true, true, true),
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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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// estimate the bounding box (using TextMetrics):
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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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* Get the metrics estimated for the text and style.
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*
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* Note: getTextMetrics does not require the PIXI representation of the stimulus
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* to be instantiated, unlike getSize().
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*
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* @name module:visual.TextStim#getTextMetrics
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* @public
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*/
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getTextMetrics()
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{
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if (typeof this._textMetrics === "undefined")
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{
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this._textMetrics = PIXI.TextMetrics.measureText(this._text, this._getTextStyle());
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// since PIXI.TextMetrics does not give us the actual bounding box of the text
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// (e.g. the height is really just the ascent + descent of the font), we use measureText:
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const textMetricsCanvas = document.createElement('canvas');
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document.body.appendChild(textMetricsCanvas);
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const ctx = textMetricsCanvas.getContext("2d");
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ctx.font = this._getTextStyle().toFontString();
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ctx.textBaseline = "alphabetic";
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ctx.textAlign = "left";
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this._textMetrics.boundingBox = ctx.measureText(this._text);
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document.body.removeChild(textMetricsCanvas);
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}
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return this._textMetrics;
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}
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/**
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* Get the default letter height given the stimulus' units.
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*
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* @name module:visual.TextStim#_getDefaultLetterHeight
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* @return {number} - the letter height corresponding to this stimulus' units.
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* @protected
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*/
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_getDefaultLetterHeight()
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{
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const height = TextStim._defaultLetterHeightMap.get(this._units);
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if (typeof height === "undefined")
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{
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throw {
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origin: "TextStim._getDefaultLetterHeight",
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context: "when getting the default height of TextStim: " + this._name,
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error: "no default letter height for unit: " + this._units,
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};
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}
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return height;
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}
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/**
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* Get the default wrap width given the stimulus' units.
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*
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* @name module:visual.TextStim#_getDefaultWrapWidth
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* @return {number} - the wrap width corresponding to this stimulus' units.
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* @protected
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*/
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_getDefaultWrapWidth()
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{
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const wrapWidth = TextStim._defaultWrapWidthMap.get(this._units);
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if (typeof wrapWidth === "undefined")
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{
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throw {
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origin: "TextStim._getDefaultWrapWidth",
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context: "when getting the default wrap width of TextStim: " + this._name,
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error: "no default wrap width for unit: " + this._units,
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};
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}
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return wrapWidth;
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}
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/**
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* Get the bounding gox.
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*
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* @name module:visual.TextStim#getBoundingBox
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* @function
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* @protected
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* @param {boolean} [tight= false] - whether or not to fit as closely as possible to the text
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* @return {number[]} - the bounding box, in the units of this TextStim
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*/
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getBoundingBox(tight = false)
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{
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if (tight)
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{
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const textMetrics_px = this.getTextMetrics();
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let left_px = this._pos[0] - textMetrics_px.boundingBox.actualBoundingBoxLeft;
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let top_px = this._pos[1] + textMetrics_px.fontProperties.descent - textMetrics_px.boundingBox.actualBoundingBoxDescent;
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const width_px = textMetrics_px.boundingBox.actualBoundingBoxRight + textMetrics_px.boundingBox.actualBoundingBoxLeft;
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const height_px = textMetrics_px.boundingBox.actualBoundingBoxAscent + textMetrics_px.boundingBox.actualBoundingBoxDescent;
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// adjust the bounding box position by taking into account the anchoring of the text:
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const boundingBox_px = this._getBoundingBox_px();
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switch (this._alignHoriz)
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{
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case "left":
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// nothing to do
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break;
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case "right":
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// TODO
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break;
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default:
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case "center":
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left_px -= (boundingBox_px.width - width_px) / 2;
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}
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switch (this._alignVert)
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{
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case "top":
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// TODO
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break;
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case "bottom":
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// nothing to do
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break;
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default:
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case "center":
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top_px -= (boundingBox_px.height - height_px) / 2;
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}
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// convert from pixel to this stimulus' units:
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const leftTop = util.to_unit(
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[left_px, top_px],
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"pix",
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this._win,
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this._units);
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const dimensions = util.to_unit(
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[width_px, height_px],
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"pix",
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this._win,
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this._units);
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return new PIXI.Rectangle(leftTop[0], leftTop[1], dimensions[0], dimensions[1]);
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}
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else
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{
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return this._boundingBox.clone();
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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.TextStim#_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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// size of the text, irrespective of the orientation:
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const textMetrics = this.getTextMetrics();
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const textSize = util.to_unit(
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[textMetrics.width, textMetrics.height],
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"pix",
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this._win,
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this._units,
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);
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// take the alignment into account:
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const anchor = this._getAnchor();
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this._boundingBox = new PIXI.Rectangle(
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this._pos[0] - anchor[0] * textSize[0],
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this._pos[1] - textSize[1] + anchor[1] * textSize[1],
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textSize[0],
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textSize[1],
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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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* Get the PIXI Text Style applied to the PIXI.Text
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*
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* @name module:visual.TextStim#_getTextStyle
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* @private
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*/
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_getTextStyle()
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{
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return new PIXI.TextStyle({
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fontFamily: this._font,
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fontSize: Math.round(this._getLengthPix(this._height)),
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fontWeight: (this._bold) ? "bold" : "normal",
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fontStyle: (this._italic) ? "italic" : "normal",
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fill: this.getContrastedColor(new Color(this._color), this._contrast).hex,
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align: this._alignHoriz,
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wordWrap: (typeof this._wrapWidth !== "undefined"),
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wordWrapWidth: (typeof this._wrapWidth !== "undefined") ? this._getHorLengthPix(this._wrapWidth) : 0,
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});
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}
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/**
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* Setter for the color attribute.
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*
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* @name module:visual.TextStim#setColor
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* @public
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* @param {undefined | null | number} color - the color
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* @param {boolean} [log= false] - whether of not to log
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*/
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setColor(color, log = false)
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{
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const hasChanged = this._setAttribute("color", color, log);
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if (hasChanged)
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{
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if (typeof this._pixi !== "undefined")
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{
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this._pixi.style = this._getTextStyle();
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this._needUpdate = true;
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}
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}
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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.TextStim#_updateIfNeeded
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* @function
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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 = new PIXI.Text(this._text, this._getTextStyle());
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// TODO is updateText necessary?
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// this._pixi.updateText();
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}
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const anchor = this._getAnchor();
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[this._pixi.anchor.x, this._pixi.anchor.y] = anchor;
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this._pixi.scale.x = this._flipHoriz ? -1 : 1;
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this._pixi.scale.y = this._flipVert ? 1 : -1;
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this._pixi.rotation = -this._ori * Math.PI / 180;
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this._pixi.position = to_pixiPoint(this.pos, this.units, this.win);
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this._pixi.alpha = this._opacity;
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this._pixi.zIndex = this._depth;
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// apply the clip mask:
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this._pixi.mask = this._clipMask;
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// update the size attribute:
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this._size = util.to_unit(
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[Math.abs(this._pixi.width), Math.abs(this._pixi.height)],
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"pix",
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this._win,
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this._units
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);
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// refine the estimate of the bounding box:
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this._boundingBox = new PIXI.Rectangle(
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this._pos[0] - anchor[0] * this._size[0],
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this._pos[1] - this._size[1] + anchor[1] * this._size[1],
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this._size[0],
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this._size[1],
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);
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}
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/**
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* Convert the alignment attributes into an anchor.
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*
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* @name module:visual.TextStim#_getAnchor
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* @function
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* @private
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* @return {number[]} - the anchor
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*/
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_getAnchor()
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{
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let anchor = [];
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switch (this._alignHoriz)
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{
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case "left":
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anchor.push(0);
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break;
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case "right":
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anchor.push(1);
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break;
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default:
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case "center":
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anchor.push(0.5);
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}
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switch (this._alignVert)
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{
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case "top":
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anchor.push(0);
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break;
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case "bottom":
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anchor.push(1);
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break;
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default:
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case "center":
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anchor.push(0.5);
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}
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return anchor;
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}
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}
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/**
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* <p>This map associates units to default letter height.</p>
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*
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* @name module:visual.TextStim#_defaultLetterHeightMap
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* @readonly
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* @private
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*/
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TextStim._defaultLetterHeightMap = new Map([
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["cm", 1.0],
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["deg", 1.0],
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["degs", 1.0],
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["degFlatPos", 1.0],
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["degFlat", 1.0],
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["norm", 0.1],
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["height", 0.2],
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["pix", 20],
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["pixels", 20],
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]);
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/**
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* <p>This map associates units to default wrap width.</p>
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*
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* @name module:visual.TextStim#_defaultLetterHeightMap
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* @readonly
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* @private
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*/
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TextStim._defaultWrapWidthMap = new Map([
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["cm", 15.0],
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["deg", 15.0],
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["degs", 15.0],
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["degFlatPos", 15.0],
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["degFlat", 15.0],
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["norm", 1],
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["height", 1],
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["pix", 500],
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["pixels", 500],
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</code></pre>
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