85 lines
2.6 KiB
JavaScript
85 lines
2.6 KiB
JavaScript
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import Edge from "./edge.mjs";
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/**
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* A special class of Map which defines all the edges used to restrict perception in a Scene.
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* @extends {Map<string, Edge>}
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*/
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export default class CanvasEdges extends Map {
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/**
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* Edge instances which represent the outer boundaries of the game canvas.
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* @type {Edge[]}
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*/
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#outerBounds = [];
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/**
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* Edge instances which represent the inner boundaries of the scene rectangle.
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* @type {Edge[]}
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*/
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#innerBounds = [];
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/* -------------------------------------------- */
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/**
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* Initialize all active edges for the Scene. This workflow occurs once only when the Canvas is first initialized.
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* Edges are created from the following sources:
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* 1. Wall documents
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* 2. Canvas boundaries (inner and outer bounds)
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* 3. Darkness sources
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* 4. Programmatically defined in the "initializeEdges" hook
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*/
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initialize() {
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this.clear();
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// Wall Documents
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for ( /** @type {Wall} */ const wall of canvas.walls.placeables ) wall.initializeEdge();
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// Canvas Boundaries
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this.#defineBoundaries();
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// Darkness Sources
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for ( const source of canvas.effects.darknessSources ) {
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for ( const edge of source.edges ) this.set(edge.id, edge);
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}
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// Programmatic Edges
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Hooks.callAll("initializeEdges");
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}
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/* -------------------------------------------- */
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/**
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* Incrementally refresh Edges by computing intersections between all registered edges.
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*/
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refresh() {
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Edge.identifyEdgeIntersections(canvas.edges.values());
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}
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/* -------------------------------------------- */
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/**
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* Define Edge instances for outer and inner canvas bounds rectangles.
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*/
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#defineBoundaries() {
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const d = canvas.dimensions;
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const define = (type, r) => {
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const top = new Edge({x: r.x, y: r.y}, {x: r.right, y: r.y}, {id: `${type}Top`, type});
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const right = new Edge({x: r.right, y: r.y}, {x: r.right, y: r.bottom}, {id: `${type}Right`, type});
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const bottom = new Edge({x: r.right, y: r.bottom}, {x: r.x, y: r.bottom}, {id: `${type}Bottom`, type});
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const left = new Edge({x: r.x, y: r.bottom}, {x: r.x, y: r.y}, {id: `${type}Left`, type});
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return [top, right, bottom, left];
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};
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// Outer canvas bounds
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this.#outerBounds = define("outerBounds", d.rect);
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for ( const b of this.#outerBounds ) this.set(b.id, b);
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// Inner canvas bounds (if there is padding)
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if ( d.rect.x === d.sceneRect.x ) this.#innerBounds = this.#outerBounds;
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else {
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this.#innerBounds = define("innerBounds", d.sceneRect);
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for ( const b of this.#innerBounds ) this.set(b.id, b);
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}
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}
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}
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