big commit

static/js/components/tairu/editor.js

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+import { Sketch } from "treehouse/sandbox.js";
+
+export class TileEditor extends Sketch {
+    constructor({ tilemap, tileSize }) {
+        super(tilemap.width * tileSize, tilemap.height * tileSize);
+
+        this.colorScheme = {
+            background: "#F7F7F7",
+            grid: "#00000011",
+            tileCursor: "#222222",
+            tiles: [
+                "transparent", // never actually drawn to the screen with the default renderer!
+                "#eb134a",
+            ],
+        };
+
+        this.tilemap = tilemap;
+        this.tileSize = tileSize;
+
+        this.hasFocus = false;
+        this.paintingTile = null;
+        this.tileCursor = { x: 0, y: 0 };
+
+        this.canvas.addEventListener("mousemove", event => this.mouseMoved(event));
+        this.canvas.addEventListener("mousedown", event => this.mousePressed(event));
+        this.canvas.addEventListener("mouseup", event => this.mouseReleased(event));
+
+        this.canvas.addEventListener("mouseenter", _ => this.mouseEnter());
+        this.canvas.addEventListener("mouseleave", _ => this.mouseLeave());
+
+        this.canvas.addEventListener("contextmenu", event => event.preventDefault());
+
+        // Only draw first frame after the constructor already runs.
+        // That way we can modify the color scheme however much we want without causing additional
+        // redraws.
+        requestAnimationFrame(() => this.draw());
+    }
+
+    draw() {
+        this.drawBackground();
+        this.drawTilemap();
+        this.drawGrid();
+        if (this.hasFocus) {
+            this.drawTileCursor();
+        }
+    }
+
+    drawBackground() {
+        this.ctx.fillStyle = this.colorScheme.background;
+        this.ctx.fillRect(0, 0, this.canvas.width, this.canvas.height);
+    }
+
+    drawTilemap() {
+        for (let y = 0; y < this.tilemap.height; ++y) {
+            for (let x = 0; x < this.tilemap.width; ++x) {
+                let tile = this.tilemap.at(x, y);
+                if (tile != 0) {
+                    this.ctx.fillStyle = this.colorScheme.tiles[tile];
+                    this.ctx.fillRect(x * this.tileSize, y * this.tileSize, this.tileSize, this.tileSize);
+                }
+            }
+        }
+    }
+
+    drawGrid() {
+        this.ctx.beginPath();
+        for (let x = 0; x < this.tilemap.width; ++x) {
+            this.ctx.moveTo(x * this.tileSize, 0);
+            this.ctx.lineTo(x * this.tileSize, this.canvas.height);
+        }
+        for (let y = 0; y < this.tilemap.width; ++y) {
+            this.ctx.moveTo(0, y * this.tileSize);
+            this.ctx.lineTo(this.canvas.width, y * this.tileSize);
+        }
+        this.ctx.strokeStyle = this.colorScheme.grid;
+        this.ctx.lineWidth = 1;
+        this.ctx.stroke();
+    }
+
+    drawTileCursor() {
+        this.ctx.strokeStyle = this.colorScheme.tileCursor;
+        this.ctx.lineWidth = 5;
+        this.ctx.strokeRect(this.tileCursor.x * this.tileSize, this.tileCursor.y * this.tileSize, this.tileSize, this.tileSize);
+    }
+
+
+    mouseMoved(event) {
+        this.tileCursor.x = Math.floor(event.offsetX / this.tileSize);
+        this.tileCursor.y = Math.floor(event.offsetY / this.tileSize);
+        this.paintTileUnderCursor();
+
+        this.draw();
+    }
+
+    mousePressed(event) {
+        event.preventDefault();
+
+        if (event.button == 0) {
+            this.paintingTile = 1;
+        } else if (event.button == 2) {
+            this.paintingTile = 0;
+        }
+
+        this.paintTileUnderCursor();
+
+        this.draw();
+    }
+
+    mouseReleased(_event) {
+        this.stopPainting();
+        this.draw();
+    }
+
+    mouseEnter() {
+        this.hasFocus = true;
+        this.draw();
+    }
+
+    mouseLeave() {
+        this.hasFocus = false;
+        this.stopPainting();
+        this.draw();
+    }
+
+    paintTileUnderCursor() {
+        if (this.paintingTile != null) {
+            this.tilemap.setAt(this.tileCursor.x, this.tileCursor.y, this.paintingTile);
+        }
+    }
+
+    stopPainting() {
+        this.paintingTile = null;
+    }
+}

static/js/components/tairu/framework.js

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+// A frameworking class assigning some CSS classes to the canvas to make it integrate nicer with CSS.
+export class Frame extends HTMLCanvasElement {
+    static fontFace = "RecVar";
+    static monoFontFace = "RecVarMono";
+
+    constructor() {
+        super();
+    }
+
+    async connectedCallback() {
+        this.style.cssText = `
+            margin-top: 8px;
+            margin-bottom: 4px;
+            border-radius: 4px;
+            max-width: 100%;
+        `;
+
+        this.ctx = this.getContext("2d");
+
+        requestAnimationFrame(this.#drawLoop.bind(this));
+    }
+
+    #drawLoop() {
+        this.ctx.font = "14px RecVar";
+        this.draw();
+        requestAnimationFrame(this.#drawLoop.bind(this));
+    }
+
+    // Override this!
+    draw() {
+        throw new ReferenceError("draw() must be overridden");
+    }
+
+    getTextPositionInBox(text, x, y, width, height, hAlign, vAlign) {
+        let measurements = this.ctx.measureText(text);
+
+        let leftX;
+        switch (hAlign) {
+            case "left":
+                leftX = x;
+                break;
+            case "center":
+                leftX = x + width / 2 - measurements.width / 2;
+                break;
+            case "right":
+                leftX = x + width - measurements.width;
+                break;
+        }
+
+        let textHeight = measurements.fontBoundingBoxAscent;
+        let baselineY;
+        switch (vAlign) {
+            case "top":
+                baselineY = y + textHeight;
+                break;
+            case "center":
+                baselineY = y + height / 2 + textHeight / 2;
+                break;
+            case "bottom":
+                baselineY = y + height;
+                break;
+        }
+
+        return { leftX, baselineY };
+    }
+
+    get scaleInViewportX() {
+        return this.clientWidth / this.width;
+    }
+
+    get scaleInViewportY() {
+        return this.clientHeight / this.height;
+    }
+
+    getMousePositionFromEvent(event) {
+        return {
+            x: event.offsetX / this.scaleInViewportX,
+            y: event.offsetY / this.scaleInViewportY,
+        };
+    }
+}
+
+export function defineFrame(elementName, claß) { // because `class` is a keyword.
+    customElements.define(elementName, claß, { extends: "canvas" });
+}
+
+defineFrame("tairu--frame", Frame);

static/js/components/tairu/proto.js

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+import { TileEditor } from 'tairu/editor.js';
+
+export function alignTextInRectangle(ctx, text, x, y, width, height, hAlign, vAlign) {
+    let measurements = ctx.measureText(text);
+
+    let leftX;
+    switch (hAlign) {
+        case "left":
+            leftX = x;
+            break;
+        case "center":
+            leftX = x + width / 2 - measurements.width / 2;
+            break;
+        case "right":
+            leftX = x + width - measurements.width;
+            break;
+    }
+
+    let textHeight = measurements.fontBoundingBoxAscent;
+    let baselineY;
+    switch (vAlign) {
+        case "top":
+            baselineY = y + textHeight;
+            break;
+        case "center":
+            baselineY = y + height / 2 + textHeight / 2;
+            break;
+        case "bottom":
+            baselineY = y + height;
+            break;
+    }
+
+    return { leftX, baselineY };
+}
+
+export function shouldConnect(a, b) {
+    return a == b;
+}
+
+export class TileEditorWithCardinalDirections extends TileEditor {
+    constructor(options) {
+        super(options);
+        this.colorScheme.tiles[1] = "#f96565";
+    }
+
+    drawConnectionText(text, enabled, tileX, tileY, hAlign, vAlign) {
+        this.ctx.beginPath();
+        this.ctx.fillStyle = enabled ? "#6c023e" : "#d84161";
+        this.ctx.font = `800 14px ${Frame.monoFontFace}`;
+        const padding = 2;
+        let topLeftX = tileX * this.tileSize + padding;
+        let topLeftY = tileY * this.tileSize + padding;
+        let rectSize = this.tileSize - padding * 2;
+        let { leftX, baselineY } = this.getTextPositionInBox(text, topLeftX, topLeftY, rectSize, rectSize, hAlign, vAlign);
+        this.ctx.fillText(text, leftX, baselineY);
+    }
+
+    drawTiles() {
+        super.drawTiles();
+        for (let y = 0; y < this.tilemap.height; ++y) {
+            for (let x = 0; x < this.tilemap.width; ++x) {
+                let tile = this.tilemap.at(x, y);
+                if (canConnect(tile)) {
+                    let connectedWithEast = shouldConnect(tile, this.tilemap.at(x + 1, y));
+                    let connectedWithSouth = shouldConnect(tile, this.tilemap.at(x, y + 1));
+                    let connectedWithNorth = shouldConnect(tile, this.tilemap.at(x, y - 1));
+                    let connectedWithWest = shouldConnect(tile, this.tilemap.at(x - 1, y));
+                    this.drawConnectionText("E", connectedWithEast, x, y, "right", "center");
+                    this.drawConnectionText("S", connectedWithSouth, x, y, "center", "bottom");
+                    this.drawConnectionText("N", connectedWithNorth, x, y, "center", "top");
+                    this.drawConnectionText("W", connectedWithWest, x, y, "left", "center");
+                }
+            }
+        }
+    }
+}

static/js/components/tairu/tilemap-registry.js

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+import { Tilemap } from './tilemap.js';
+
+const alphabet = " x";
+
+function parseTilemap(lineArray) {
+    let tilemap = new Tilemap(lineArray[0].length, lineArray.length);
+    for (let y in lineArray) {
+        let line = lineArray[y];
+        for (let x = 0; x < line.length; ++x) {
+            let char = line.charAt(x);
+            tilemap.setAt(x, y, alphabet.indexOf(char));
+        }
+    }
+    return tilemap;
+}
+
+export default {
+    bitwiseAutotiling: parseTilemap([
+        "         ",
+        "   xxx   ",
+        "   xxx   ",
+        "   xxx   ",
+        "         ",
+    ]),
+    bitwiseAutotilingChapter2: parseTilemap([
+        "         ",
+        "   x     ",
+        "   x     ",
+        "   xxx   ",
+        "         ",
+    ]),
+    bitwiseAutotilingCorners: parseTilemap([
+        "     ",
+        " x x ",
+        "  x  ",
+        " x x ",
+        "     ",
+    ]),
+    bitwiseAutotiling47: parseTilemap([
+        "      x  ",
+        "   x     ",
+        "  xx xx  ",
+        "   xxxx  ",
+        "  x      ",
+    ]),
+};
+

static/js/components/tairu/tilemap.js

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+export class Tilemap {
+    constructor(width, height) {
+        this.width = width;
+        this.height = height;
+        this.tiles = new Uint8Array(width * height);
+        this.default = 0;
+    }
+
+    tileIndex(x, y) {
+        return x + y * this.width;
+    }
+
+    inBounds(x, y) {
+        return x >= 0 && y >= 0 && x < this.width && y < this.height;
+    }
+
+    at(x, y) {
+        if (this.inBounds(x, y)) {
+            return this.tiles[this.tileIndex(x, y)];
+        } else {
+            return this.default;
+        }
+    }
+
+    setAt(x, y, tile) {
+        if (this.inBounds(x, y)) {
+            this.tiles[this.tileIndex(x, y)] = tile;
+        }
+    }
+
+    static parse(alphabet, lineArray) {
+        let tilemap = new Tilemap(lineArray[0].length, lineArray.length);
+        for (let y in lineArray) {
+            let line = lineArray[y];
+            for (let x = 0; x < line.length; ++x) {
+                let char = line.charAt(x);
+                tilemap.setAt(x, y, alphabet.indexOf(char));
+            }
+        }
+        return tilemap;
+    }
+}