53 lines
1.3 KiB
JavaScript
53 lines
1.3 KiB
JavaScript
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const SPACE_BETWEEN_PLATFORMS = 80;
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function createPlatform(x, y, elevation, width = 60) {
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const platform = new Sprite();
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platform.x = x;
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platform.y = y;
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platform.elevation = elevation;
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platform.w = width;
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platform.h = 15;
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platform.physics = 'static';
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platform.bounciness = 0;
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return platform;
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}
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export function updatePlatforms(platforms, elevation, elGain) {
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if (elGain <= 0)
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return platforms;
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let minY = height;
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for (let i = platforms.length - 1; i >= 0; i--) {
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const plat = platforms[i];
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plat.y += elGain;
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if (plat.y > height) {
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platforms.remove(plat);
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continue;
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}
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if (plat.y < minY) {
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minY = plat.y;
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}
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}
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// Add new platforms at the top
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let spawnY = minY - SPACE_BETWEEN_PLATFORMS;
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while (spawnY >= SPACE_BETWEEN_PLATFORMS) {
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const newPlat = createPlatform(random(40, width - 40), spawnY, elevation + minY - spawnY);
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platforms.add(newPlat);
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spawnY -= SPACE_BETWEEN_PLATFORMS;
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}
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return platforms;
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}
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export function initPlatforms() {
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let platforms = new Group();
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updatePlatforms(platforms, 10, 10);
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const basePlatform = createPlatform(width / 2, height - 10, 0, width);
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platforms.add(basePlatform);
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return platforms;
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}
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