49 lines
1.3 KiB
JavaScript
49 lines
1.3 KiB
JavaScript
import { WORLD, VIEWPORT } from "./config.js";
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export function createPlatforms() {
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const result = [];
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const count = 16;
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const spacing = 145;
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for (let index = 0; index < count; index += 1) {
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const width = index === 0 ? 220 : 150 + (index % 4) * 34;
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const x = index === 0 ? (WORLD.width - width) / 2 : 40 + ((index * 173) % (WORLD.width - width - 80));
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const y = WORLD.height - 70 - index * spacing;
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result.push({
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id: index + 1,
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x,
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y,
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width,
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height: 22,
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});
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}
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return result;
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}
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export function getVisiblePlatforms(platforms, camera) {
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return platforms
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.filter((platform) => isPlatformVisible(platform, camera))
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.map((platform) => ({
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...platform,
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local: worldToViewport(platform, camera),
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}));
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}
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export function isPlatformVisible(platform, camera) {
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return (
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platform.x + platform.width >= camera.x &&
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platform.x <= camera.x + VIEWPORT.width &&
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platform.y + platform.height >= camera.y &&
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platform.y <= camera.y + VIEWPORT.height
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);
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}
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export function worldToViewport(point, camera) {
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return {
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x: point.x - camera.x,
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y: point.y - camera.y,
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};
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}
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