# visual/Polygon.js

    /**
     * Polygonal Stimulus.
     *
     * @author Alain Pitiot
     * @version 2022.2.3
     * @copyright (c) 2017-2020 Ilixa Ltd. (http://ilixa.com) (c) 2020-2022 Open Science Tools Ltd. (https://opensciencetools.org)
     * @license Distributed under the terms of the MIT License
     */

    import { Color } from "../util/Color.js";
    import { ShapeStim } from "./ShapeStim.js";

    /**
     * <p>Polygonal visual stimulus.</p>
     *
     * @extends ShapeStim
     */
    export class Polygon extends ShapeStim
    {
    	/**
    	 * <p>Polygonal visual stimulus.</p>
    	 *
    	 * @memberOf module:visual
    	 * @param {Object} options
    	 * @param {String} options.name - the name used when logging messages from this stimulus
    	 * @param {Window} options.win - the associated Window
    	 * @param {number} [options.lineWidth= 1.5] - the line width
    	 * @param {Color} [options.lineColor= Color('white')] the line color
    	 * @param {Color} options.fillColor - the fill color
    	 * @param {number} [options.opacity= 1.0] - the opacity
    	 * @param {number} [options.edges= 3] - the number of edges of the polygon
    	 * @param {number} [options.radius= 0.5] - the radius of the polygon
    	 * @param {Array.<number>} [options.pos= [0, 0]] - the position
    	 * @param {number} [options.size= 1.0] - the size
    	 * @param {number} [options.ori= 0.0] - the orientation (in degrees)
    	 * @param {string} options.units - the units of the stimulus vertices, size and position
    	 * @param {number} [options.contrast= 1.0] - the contrast
    	 * @param {number} [options.depth= 0] - the depth
    	 * @param {boolean} [options.interpolate= true] - whether or not the shape is interpolated
    	 * @param {boolean} [options.autoDraw= false] - whether or not the stimulus should be automatically drawn on every frame flip
    	 * @param {boolean} [options.autoLog= false] - whether or not to log
    	 */
    	constructor({ name, win, lineWidth, lineColor, fillColor, opacity, edges, radius, pos, size, ori, units, contrast, depth, interpolate, autoDraw, autoLog } = {})
    	{
    		super({
    			name,
    			win,
    			lineWidth,
    			lineColor,
    			fillColor,
    			opacity,
    			pos,
    			ori,
    			size,
    			units,
    			contrast,
    			depth,
    			interpolate,
    			autoDraw,
    			autoLog,
    		});

    		this._psychoJS.logger.debug("create a new Polygon with name: ", name);

    		this._addAttribute(
    			"edges",
    			edges,
    			3,
    		);
    		this._addAttribute(
    			"radius",
    			radius,
    			0.5,
    		);

    		this._updateVertices();

    		if (this._autoLog)
    		{
    			this._psychoJS.experimentLogger.exp(`Created ${this.name} = ${this.toString()}`);
    		}
    	}

    	/**
    	 * Setter for the radius attribute.
    	 *
    	 * @param {number} radius - the polygon radius
    	 * @param {boolean} [log= false] - whether of not to log
    	 */
    	setRadius(radius, log = false)
    	{
    		const hasChanged = this._setAttribute("radius", radius, log);

    		if (hasChanged)
    		{
    			this._updateVertices();
    		}
    	}

    	/**
    	 * Setter for the edges attribute.
    	 *
    	 * @param {number} edges - the number of edges
    	 * @param {boolean} [log= false] - whether of not to log
    	 */
    	setEdges(edges, log = false)
    	{
    		const hasChanged = this._setAttribute("edges", Math.round(edges), log);

    		if (hasChanged)
    		{
    			this._updateVertices();
    		}
    	}

    	/**
    	 * Update the vertices.
    	 *
    	 * @protected
    	 * @name module:visual.Polygon#_updateVertices
    	 */
    	_updateVertices()
    	{
    		this._psychoJS.logger.debug("update the vertices of Polygon: ", this.name);

    		const angle = 2.0 * Math.PI / this._edges;
    		const vertices = [];
    		for (let v = 0; v < this._edges; ++v)
    		{
    			vertices.push([Math.sin(v * angle) * this._radius, Math.cos(v * angle) * this._radius]);
    		}

    		this.setVertices(vertices);
    	}
    }