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