126 lines
3.6 KiB
JavaScript
Executable File
126 lines
3.6 KiB
JavaScript
Executable File
export class PseudoPixel {
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/**
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* @param {HTMLElement} htmlElement
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* @param {string} char
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* @param {number|string} color text/foreground color
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*/
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constructor(htmlElement, char = " ", color = "#fff") {
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//
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/** @type {HTMLElement} el the html element that makes up this cell*/
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this.htmlElement = htmlElement;
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/** @type {string} char */
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this.char = char;
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/** @type {number|string} fg color color */
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this.color = color;
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/** @type {boolean} Has this pixel's text content been updated since it was flushed to DOM ? */
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this.dirtyChar = true;
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/** @type {boolean} Has this pixel's color been updated since it was flushed to DOM ? */
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this.dirtyColor = true;
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}
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clone() {
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return new PseudoPixel(this.htmlElement, this.car, this.color);
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}
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}
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export class AsciiWindow {
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/**
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* @param {HTMLElement} htmlElement the html element that contains all the pseudo-pixel elements
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* @param {number} width Canvas width (in pseudo-pixels)
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* @param {number} height Canvas height (in pseudo-pixels)
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*/
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constructor(htmlElement, width, height) {
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//
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/** @type {HTMLElement} the html element that contains all the pseudo-pixels */
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this.htmlElement = htmlElement;
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/** @type {number} width Canvas width (in pseudo-pixels) */
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this.width = width;
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/** @type {number} height Canvas height (in pseudo-pixels) */
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this.height = height;
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/** @type {PseudoPixel[]} */
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this.pseudoPixels = [];
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this.initializeCanvaas();
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}
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/**
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* Create the html elements that make up the canvas,
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* as well as a buffer that holds a copy of the data
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* in the cells so we can diff properly.
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*/
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initializeCanvaas() {
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const w = this.width;
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const h = this.height;
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this.pseudoPixels = new Array(w * h).fill();
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let i = 0;
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for (let y = 0; y < h; y++) {
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const rowEl = document.createElement("div");
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this.htmlElement.appendChild(rowEl);
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for (let x = 0; x < w; x++) {
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const pixelEl = document.createElement("code");
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rowEl.appendChild(pixelEl);
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pixelEl.textContent = " ";
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this.pseudoPixels[i] = new PseudoPixel(pixelEl, " ", "#fff");
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i++;
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}
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}
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}
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withinBounds(x, y) {
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return x >= 0 && x < this.width && y >= 0 && y < this.height;
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}
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mustBeWithinBounds(x, y) {
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if (!this.withinBounds(x, y)) {
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throw new Error(`Coordinate [${x}, ${y}] is out of bounds`);
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}
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}
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put(x, y, char, color) {
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//
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this.mustBeWithinBounds(x, y);
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const idx = this.width * y + x;
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const pixel = this.pseudoPixels[idx];
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// Check for changes in text contents
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if (char !== undefined && char !== null && char !== pixel.char) {
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pixel.char = char;
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pixel.dirtyChar = true;
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}
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if (color !== undefined && color !== null && color !== pixel.color) {
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pixel.color = color;
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pixel.dirtyColor = true;
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}
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}
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/**
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* Apply all patches to the DOM
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*
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* @return {number} number of DOM updates made
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*/
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commitToDOM() {
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this.pseudoPixels.forEach((pixel) => {
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if (pixel.dirtyChar) {
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pixel.htmlElement.textContent = pixel.char;
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pixel.dirtyChar = false;
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}
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if (pixel.dirtyColor) {
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pixel.htmlElement.style.color = pixel.color;
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pixel.dirtyColor = false;
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}
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});
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}
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}
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