From 980ccdd075127dcfe727615a7b56c6b01aec94fb Mon Sep 17 00:00:00 2001
From: "smx.pusha" <139338836+smxpusha@users.noreply.github.com>
Date: Thu, 6 Aug 2026 09:45:10 +0200
Subject: [PATCH] ENH - scale sky flappy difficulty
---
.../features/games/sky-flappy/engine.test.ts | 18 +++++++++++--
.../src/features/games/sky-flappy/engine.ts | 26 ++++++++++++++++---
.../src/features/games/sky-flappy/types.ts | 1 +
frontend/src/views/apps/SkyFlappyApp.vue | 2 +-
sky_phone/source/html/index.html | 2 +-
5 files changed, 41 insertions(+), 8 deletions(-)
diff --git a/frontend/src/features/games/sky-flappy/engine.test.ts b/frontend/src/features/games/sky-flappy/engine.test.ts
index 3df016c..5c88578 100644
--- a/frontend/src/features/games/sky-flappy/engine.test.ts
+++ b/frontend/src/features/games/sky-flappy/engine.test.ts
@@ -3,9 +3,12 @@ import { describe, expect, it } from 'vitest'
import {
createSkyFlappyGame,
FLAPPY_GAP_HEIGHT,
+ FLAPPY_MAX_SPEED,
FLAPPY_MAX_GAP_TOP,
+ FLAPPY_MIN_GAP_HEIGHT,
FLAPPY_MIN_GAP_TOP,
flapSkyGlider,
+ getSkyFlappyDifficulty,
stepSkyFlappy,
} from './engine'
@@ -36,10 +39,21 @@ describe('sky flappy engine', () => {
expect(high.obstacles[0].gapTop + FLAPPY_GAP_HEIGHT).toBeLessThan(100)
})
+ it('increases speed and narrows the gap as the score rises', () => {
+ const start = getSkyFlappyDifficulty(0)
+ const advanced = getSkyFlappyDifficulty(20)
+ const maximum = getSkyFlappyDifficulty(100)
+
+ expect(advanced.speed).toBeGreaterThan(start.speed)
+ expect(advanced.gapHeight).toBeLessThan(start.gapHeight)
+ expect(maximum.speed).toBe(FLAPPY_MAX_SPEED)
+ expect(maximum.gapHeight).toBe(FLAPPY_MIN_GAP_HEIGHT)
+ })
+
it('scores an obstacle only once', () => {
const state = {
...flapSkyGlider(createSkyFlappyGame()),
- obstacles: [{ gapTop: 30, id: 1, scored: false, x: 7 }],
+ obstacles: [{ gapHeight: FLAPPY_GAP_HEIGHT, gapTop: 30, id: 1, scored: false, x: 7 }],
}
const scored = stepSkyFlappy(state, 0.01, () => 0.5)
expect(scored.score).toBe(1)
@@ -49,7 +63,7 @@ describe('sky flappy engine', () => {
it('detects collision using the player edges', () => {
const state = {
...flapSkyGlider(createSkyFlappyGame()),
- obstacles: [{ gapTop: 40, id: 1, scored: false, x: 22 }],
+ obstacles: [{ gapHeight: FLAPPY_GAP_HEIGHT, gapTop: 40, id: 1, scored: false, x: 22 }],
playerY: 41,
playerVelocity: 0,
}
diff --git a/frontend/src/features/games/sky-flappy/engine.ts b/frontend/src/features/games/sky-flappy/engine.ts
index 1413e0d..4dae434 100644
--- a/frontend/src/features/games/sky-flappy/engine.ts
+++ b/frontend/src/features/games/sky-flappy/engine.ts
@@ -6,8 +6,21 @@ export const FLAPPY_GRAVITY = 82
export const FLAPPY_IMPULSE = -34
export const FLAPPY_OBSTACLE_WIDTH = 14
export const FLAPPY_GAP_HEIGHT = 29
+export const FLAPPY_MIN_GAP_HEIGHT = 22
export const FLAPPY_MIN_GAP_TOP = 15
export const FLAPPY_MAX_GAP_TOP = 56
+export const FLAPPY_BASE_SPEED = 20.5
+export const FLAPPY_MAX_SPEED = 40
+
+export function getSkyFlappyDifficulty(score: number): {
+ gapHeight: number
+ speed: number
+} {
+ return {
+ gapHeight: Math.max(FLAPPY_MIN_GAP_HEIGHT, FLAPPY_GAP_HEIGHT - score * 0.35),
+ speed: Math.min(FLAPPY_MAX_SPEED, FLAPPY_BASE_SPEED + score * 0.65),
+ }
+}
export function createSkyFlappyGame(): SkyFlappyGameState {
return {
@@ -27,9 +40,11 @@ export function flapSkyGlider(state: SkyFlappyGameState): SkyFlappyGameState {
function createObstacle(
id: number,
+ gapHeight: number,
random: () => number,
): SkyFlappyObstacle {
return {
+ gapHeight,
gapTop:
FLAPPY_MIN_GAP_TOP +
Math.max(0, Math.min(1, random())) *
@@ -52,7 +67,7 @@ function collidesWithObstacle(
return (
playerY - FLAPPY_PLAYER_RADIUS < obstacle.gapTop ||
- playerY + FLAPPY_PLAYER_RADIUS > obstacle.gapTop + FLAPPY_GAP_HEIGHT
+ playerY + FLAPPY_PLAYER_RADIUS > obstacle.gapTop + obstacle.gapHeight
)
}
@@ -63,19 +78,22 @@ export function stepSkyFlappy(
): SkyFlappyGameState {
if (state.status !== 'playing' || elapsedSeconds <= 0) return state
- const speed = Math.min(33, 20.5 + state.score * 0.38)
+ const difficulty = getSkyFlappyDifficulty(state.score)
const playerVelocity = state.playerVelocity + FLAPPY_GRAVITY * elapsedSeconds
const playerY = state.playerY + playerVelocity * elapsedSeconds
let nextObstacleId = state.nextObstacleId
let obstacles = state.obstacles
.map((obstacle) => ({
...obstacle,
- x: obstacle.x - speed * elapsedSeconds,
+ x: obstacle.x - difficulty.speed * elapsedSeconds,
}))
.filter((obstacle) => obstacle.x + FLAPPY_OBSTACLE_WIDTH > -2)
if (obstacles.length === 0 || obstacles[obstacles.length - 1].x < 61) {
- obstacles = [...obstacles, createObstacle(nextObstacleId, random)]
+ obstacles = [
+ ...obstacles,
+ createObstacle(nextObstacleId, difficulty.gapHeight, random),
+ ]
nextObstacleId += 1
}
diff --git a/frontend/src/features/games/sky-flappy/types.ts b/frontend/src/features/games/sky-flappy/types.ts
index fa42cb4..f4fd71d 100644
--- a/frontend/src/features/games/sky-flappy/types.ts
+++ b/frontend/src/features/games/sky-flappy/types.ts
@@ -2,6 +2,7 @@ export type SkyFlappyStatus = 'over' | 'paused' | 'playing' | 'ready'
export type SkyFlappyDesign = 'dawn' | 'neon' | 'storm'
export type SkyFlappyObstacle = {
+ gapHeight: number
gapTop: number
id: number
scored: boolean
diff --git a/frontend/src/views/apps/SkyFlappyApp.vue b/frontend/src/views/apps/SkyFlappyApp.vue
index c727e9d..befce7d 100644
--- a/frontend/src/views/apps/SkyFlappyApp.vue
+++ b/frontend/src/views/apps/SkyFlappyApp.vue
@@ -141,7 +141,7 @@ onBeforeUnmount(() => {
-
+
{{ phone.t('Apps.skyFlappy.firstTap') }}
diff --git a/sky_phone/source/html/index.html b/sky_phone/source/html/index.html
index be1dc48..ba95d5e 100644
--- a/sky_phone/source/html/index.html
+++ b/sky_phone/source/html/index.html
@@ -4,7 +4,7 @@
Sky Phone
-
+