51 lines
1.4 KiB
JavaScript
51 lines
1.4 KiB
JavaScript
import {Canvas, Container, Sprite} from '@avocado/graphics';
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import {Rectangle, Vector} from '@avocado/math';
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export class TilesRenderer {
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constructor(tiles, tileset) {
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this.tiles = tiles;
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this.tileset = tileset;
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}
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renderChunk(renderer, rectangle) {
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// No rectangle? Render all.
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if (!rectangle) {
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rectangle = Rectangle.compose([0, 0], this.tiles.size);
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}
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const slice = this.tiles.slice(rectangle);
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if (!slice) {
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return undefined;
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}
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// Precalcs.
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const size = Rectangle.size(rectangle);
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const tileSize = this.tileset.tileSize;
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const rowWidth = size[0] * tileSize[0];
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// Render all tiles.
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const container = new Container();
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const position = [0, 0];
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for (let i = 0; i < slice.length; ++i) {
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const index = slice[i];
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const sprite = new Sprite(this.tileset.subimages[index]);
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sprite.position = position;
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container.addChild(sprite);
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// Only adds, please.
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position[0] += tileSize[0];
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if (rowWidth === position[0]) {
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position[0] = 0;
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position[1] += tileSize[1];
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}
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}
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// Blit to canvas.
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const canvasSize = Vector.mul(size, tileSize);
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const canvas = new Canvas(canvasSize);
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canvas.render(container, renderer);
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container.destroy();
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// Convert to image and return.
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const image = canvas.toImage();
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canvas.destroy();
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return image;
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}
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}
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