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240 lines
9.5 KiB
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<title>JSDoc: Source: core/WindowMixin.js</title>
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<h1 class="page-title">Source: core/WindowMixin.js</h1>
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<article>
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<pre class="prettyprint source linenums"><code>/**
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* Mixin implementing various unit-handling measurement methods.
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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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/**
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* <p>This mixin implements various unit-handling measurement methods.</p>
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*
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* <p>Note: (a) this is the equivalent of PsychoPY's WindowMixin.
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* (b) it will most probably be made obsolete by a fully-integrated unit approach.
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* </p>
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*
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* @name module:core.WindowMixin
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* @mixin
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*
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*/
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export let WindowMixin = (superclass) =>
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class extends superclass
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{
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constructor(args)
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{
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super(args);
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}
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/**
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* Convert the given length from stimulus unit to pixel units.
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*
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* @name module:core.WindowMixin#_getLengthPix
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* @function
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* @protected
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* @param {number} length - the length in stimulus units
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* @param {boolean} [integerCoordinates = false] - whether or not to round the length.
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* @return {number} - the length in pixel units
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*/
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_getLengthPix(length, integerCoordinates = false)
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{
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let response = {
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origin: "WindowMixin._getLengthPix",
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context: "when converting a length from stimulus unit to pixel units",
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};
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let length_px;
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if (this._units === "pix")
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{
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length_px = length;
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}
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else if (typeof this._units === "undefined" || this._units === "norm")
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{
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var winSize = this.win.size;
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length_px = length * winSize[1] / 2; // TODO: how do we handle norm when width != height?
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}
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else if (this._units === "height")
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{
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const minSize = Math.min(this.win.size[0], this.win.size[1]);
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length_px = length * minSize;
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}
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else
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{
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// throw { ...response, error: 'unable to deal with unit: ' + this._units };
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throw Object.assign(response, { error: "unable to deal with unit: " + this._units });
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}
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if (integerCoordinates)
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{
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return Math.round(length_px);
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}
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else
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{
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return length_px;
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}
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}
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/**
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* Convert the given length from pixel units to the stimulus units
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*
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* @name module:core.WindowMixin#_getLengthUnits
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* @function
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* @protected
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* @param {number} length_px - the length in pixel units
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* @return {number} - the length in stimulus units
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*/
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_getLengthUnits(length_px)
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{
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let response = {
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origin: "WindowMixin._getLengthUnits",
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context: "when converting a length from pixel unit to stimulus units",
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};
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if (this._units === "pix")
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{
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return length_px;
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}
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else if (typeof this._units === "undefined" || this._units === "norm")
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{
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const winSize = this.win.size;
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return length_px / (winSize[1] / 2); // TODO: how do we handle norm when width != height?
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}
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else if (this._units === "height")
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{
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const minSize = Math.min(this.win.size[0], this.win.size[1]);
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return length_px / minSize;
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}
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else
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{
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// throw { ...response, error: 'unable to deal with unit: ' + this._units };
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throw Object.assign(response, { error: "unable to deal with unit: " + this._units });
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}
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}
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/**
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* Convert the given length from stimulus units to pixel units
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*
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* @name module:core.WindowMixin#_getHorLengthPix
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* @function
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* @protected
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* @param {number} length - the length in stimulus units
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* @return {number} - the length in pixels
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*/
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_getHorLengthPix(length)
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{
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let response = {
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origin: "WindowMixin._getHorLengthPix",
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context: "when converting a length from stimulus units to pixel units",
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};
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if (this._units === "pix")
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{
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return length;
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}
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else if (typeof this._units === "undefined" || this._units === "norm")
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{
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var winSize = this.win.size;
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return length * winSize[0] / 2;
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}
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else if (this._units === "height")
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{
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const minSize = Math.min(this.win.size[0], this.win.size[1]);
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return length * minSize;
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}
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else
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{
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// throw { ...response, error: 'unable to deal with unit: ' + this._units };
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throw Object.assign(response, { error: "unable to deal with unit: " + this._units });
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}
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}
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/**
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* Convert the given length from pixel units to the stimulus units
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*
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* @name module:core.WindowMixin#_getVerLengthPix
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* @function
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* @protected
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* @param {number} length - the length in pixel units
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* @return {number} - the length in stimulus units
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*/
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_getVerLengthPix(length)
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{
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let response = {
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origin: "WindowMixin._getVerLengthPix",
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context: "when converting a length from pixel unit to stimulus units",
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};
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if (this._units === "pix")
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{
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return length;
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}
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else if (typeof this._units === "undefined" || this._units === "norm")
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{
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var winSize = this.win.size;
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return length * winSize[1] / 2;
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}
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else if (this._units === "height")
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{
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const minSize = Math.min(this.win.size[0], this.win.size[1]);
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return length * minSize;
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}
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else
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{
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// throw { ...response, error: 'unable to deal with unit: ' + this._units };
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throw Object.assign(response, { error: "unable to deal with unit: " + this._units });
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}
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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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