54 lines
1.3 KiB
JavaScript
54 lines
1.3 KiB
JavaScript
/**
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* A special Graphics class which handles Grid layer highlighting
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* @extends {PIXI.Graphics}
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*/
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class GridHighlight extends PIXI.Graphics {
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constructor(name, ...args) {
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super(...args);
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/**
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* Track the Grid Highlight name
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* @type {string}
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*/
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this.name = name;
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/**
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* Track distinct positions which have already been highlighted
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* @type {Set}
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*/
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this.positions = new Set();
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}
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/* -------------------------------------------- */
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/**
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* Record a position that is highlighted and return whether or not it should be rendered
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* @param {number} x The x-coordinate to highlight
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* @param {number} y The y-coordinate to highlight
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* @return {boolean} Whether or not to draw the highlight for this location
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*/
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highlight(x, y) {
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let key = `${x},${y}`;
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if ( this.positions.has(key) ) return false;
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this.positions.add(key);
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return true;
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}
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/* -------------------------------------------- */
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/** @inheritdoc */
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clear() {
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this.positions = new Set();
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return super.clear();
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}
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/* -------------------------------------------- */
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/** @inheritdoc */
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destroy(...args) {
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delete canvas.interface.grid.highlightLayers[this.name];
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return super.destroy(...args);
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}
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}
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