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vela-snake/src/pages/index/index.ux
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<template>
<div class="page">
<scroll id="scroller" class="page" scroll-y="true" direction="vertical" onscroll="onCrownScroll">
<stack class="dial">
<image class="board" src="/common/tex/board.png" onclick="onTap"></image>
<image class="food" src="/common/tex/apple.png" show="{{ hasFood }}" onclick="onTap" style="left: {{ food.left }}; top: {{ food.top }};"></image>
<image class="seg" src="{{ seg.src }}" for="{{ seg in snake }}" onclick="onTap" style="left: {{ seg.left }}; top: {{ seg.top }};"></image>
<div class="hud">
<text class="score">{{ scoreText }}</text>
<text class="best">{{ bestText }}</text>
</div>
<div class="footer">
<text class="modeLabel">{{ modeText }}</text>
<text class="hint">swipe / tap pause</text>
</div>
<div class="overlay" show="{{ paused && !over }}">
<text class="overText">PAUSED</text>
<text class="overSub">{{ scoreText }}</text>
<text class="retry" onclick="onTap">RESUME</text>
<text class="overHint">Change mode: new game</text>
<div class="modes">
<text class="modeButton" onclick="selectMode('classic')">CLASSIC</text>
<text class="modeButton" onclick="selectMode('wrap')">WRAP</text>
</div>
</div>
<div class="overlay" show="{{ over }}">
<text class="overText">{{ endText }}</text>
<text class="overSub">{{ scoreText }}</text>
<text class="retry" onclick="restart">PLAY AGAIN</text>
<text class="overHint">Change mode: new game</text>
<div class="modes">
<text class="modeButton" onclick="selectMode('classic')">CLASSIC</text>
<text class="modeButton" onclick="selectMode('wrap')">WRAP</text>
</div>
</div>
</stack>
</scroll>
</div>
</template>
<script>
import snake from '../../common/snake.js'
import storage from '@system.storage'
import best from '../../common/best.js'
const CELL = snake.ARENA.cell
const GRID = snake.ARENA
const OFFSET = snake.ARENA.offset
// Crown rotation arrives as scroll deltas on the focused scroll container
// (see docs/CROWN.md). This many px of accumulated scroll = one 90° turn.
const CROWN_STEP_PX = 40
const CW_ORDER = [{ x: 1, y: 0 }, { x: 0, y: 1 }, { x: -1, y: 0 }, { x: 0, y: -1 }]
function rotate90(d, clockwise) {
let i = 0
for (let k = 0; k < 4; k++) {
if (CW_ORDER[k].x === d.x && CW_ORDER[k].y === d.y) { i = k; break }
}
return clockwise ? CW_ORDER[(i + 1) % 4] : CW_ORDER[(i + 3) % 4]
}
export default {
private: {
snake: [],
food: { left: '57px', top: '57px' },
hasFood: true,
endText: 'GAME OVER',
scoreText: 'SCORE 0',
bestText: 'BEST 0',
mode: 'classic',
modeText: 'CLASSIC',
paused: false,
over: false
},
onInit() {
this.dir = { x: 1, y: 0 }
this.queue = []
this.records = best.getStore(storage)
this.records.subscribe(value => { if (!this.destroyed) this.bestText = 'BEST ' + value })
this.reset()
this.records.sync()
},
onShow() {
if (this.destroyed) return
this.visible = true
this.crownAnchor = 233
try { this.$element('scroller').scrollTo({ top: 233 }) } catch (err) {}
this.records.sync()
this.startTimer()
},
stopTimer() {
this.timerEpoch = (this.timerEpoch || 0) + 1
clearInterval(this.timer)
this.timer = null
},
startTimer() {
this.stopTimer()
if (this.destroyed || !this.visible || this.paused || this.over) return
const epoch = this.timerEpoch
this.timer = setInterval(() => {
if (epoch === this.timerEpoch) this.tick()
}, Math.max(120, 300 - (this.model.length - 3) * 10))
},
onHide() {
this.visible = false
this.paused = true
this.queue = []
this.stopTimer()
},
onDestroy() {
this.onHide()
this.destroyed = true
this.records.subscribe(null)
},
reset() {
this.model = snake.initialSnake()
this.foodModel = snake.spawnFood(this.model, GRID)
this.dir = { x: 1, y: 0 }
this.queue = []
this.over = false
this.endText = 'GAME OVER'
this.paused = false
this.rebuild()
},
tick() {
if (this.over || this.paused || this.destroyed || this.visible === false) return
if (this.queue.length) this.dir = this.queue.shift()
const r = snake.step(this.model, this.dir, this.foodModel, GRID, this.mode)
if (!r.alive) {
this.over = true
this.stopTimer()
return
}
this.model = r.snake
if (r.ate) {
this.foodModel = snake.spawnFood(this.model, GRID)
if (!this.foodModel) {
this.over = true
this.endText = 'YOU WIN'
this.stopTimer()
}
}
this.rebuild()
if (r.ate) {
this.records.record(this.model.length - 3)
this.startTimer()
}
},
selectMode(mode) {
if (this.destroyed || !this.visible || (!this.paused && !this.over)) return
if ((mode !== 'classic' && mode !== 'wrap') || mode === this.mode) return
this.mode = mode
this.modeText = mode === 'wrap' ? 'WRAP' : 'CLASSIC'
this.reset()
this.paused = true
this.stopTimer()
},
restart() {
if (this.destroyed || this.visible === false) return
this.reset()
this.startTimer()
},
onSwipe(e) {
if (this.over || this.paused || this.destroyed || this.visible === false) return
const d = e.direction
let v
if (d === 'left') v = { x: -1, y: 0 }
else if (d === 'right') v = { x: 1, y: 0 }
else if (d === 'up') v = { x: 0, y: -1 }
else if (d === 'down') v = { x: 0, y: 1 }
else return
const last = this.queue.length ? this.queue[this.queue.length - 1] : this.dir
if (this.queue.length >= 2 || (last.x === v.x && last.y === v.y)) return
if (snake.turn(last, v) === last) return
this.queue.push(v)
},
// Crown rotation: firmware routes it into this container's scroll offset
// (docs/CROWN.md). Accumulate deltas, one 90° turn per CROWN_STEP_PX, then
// re-center so the board never visibly moves.
onCrownScroll(e) {
if (this.destroyed) return
const top = e && typeof e.scrollTop === 'number' ? e.scrollTop : 0
const center = 233
const d = top - (this.crownAnchor == null ? center : this.crownAnchor)
this.crownAnchor = top
if (d === 0) return
// keep the dial pinned: snap back to center immediately
try { this.$element('scroller').scrollTo({ top: center }) } catch (err) {}
this.crownAnchor = center
if (this.over || this.paused || !this.visible) return
this.crownAcc = (this.crownAcc || 0) + d
while (Math.abs(this.crownAcc) >= CROWN_STEP_PX) {
const clockwise = this.crownAcc > 0
this.crownAcc += clockwise ? -CROWN_STEP_PX : CROWN_STEP_PX
const base = this.queue.length ? this.queue[this.queue.length - 1] : this.dir
if (this.queue.length >= 2) return
const v = rotate90(base, clockwise)
if (v.x === base.x && v.y === base.y) return
this.queue.push(v)
}
},
onTap() {
if (this.destroyed || !this.visible || this.over) return
this.paused = !this.paused
this.queue = []
this.startTimer()
},
rebuild() {
const pieces = snake.renderPieces(this.model, this.dir, this.mode === 'wrap' ? GRID : 0)
const out = []
for (let i = 0; i < this.model.length; i++) {
const s = this.model[i]
out.push({
left: (OFFSET + s.x * CELL) + 'px',
top: (OFFSET + s.y * CELL) + 'px',
src: '/common/tex/' + pieces[i] + '.png'
})
}
this.snake = out
this.hasFood = !!this.foodModel
if (this.hasFood) this.food = {
left: (OFFSET + this.foodModel.x * CELL) + 'px',
top: (OFFSET + this.foodModel.y * CELL) + 'px'
}
this.scoreText = 'SCORE ' + (this.model.length - 3)
}
}
</script>
<style>
.page {
width: 466px; height: 466px;
background-color: #000000;
align-items: center;
justify-content: center;
/* scrollable travel: dial centered in 932px content, 233px of crown travel
each way; onReady + onscroll snap back to the center offset (233) */
padding-top: 233px;
padding-bottom: 233px;
}
.dial {
width: 466px; height: 466px;
}
.board {
position: absolute; left: 49px; top: 49px;
width: 368px; height: 368px;
}
.seg {
position: absolute;
width: 32px; height: 32px;
}
.food {
position: absolute;
width: 32px; height: 32px;
}
.score {
width: 152px; height: 20px;
color: #d8edce; font-size: 18px; text-align: center;
}
.best {
width: 152px; height: 20px;
color: #f3bd60; font-size: 17px; text-align: center;
}
.hud {
position: absolute; left: 157px; top: 16px;
width: 152px; height: 40px;
flex-direction: column; align-items: center;
}
.footer {
position: absolute; left: 143px; top: 410px;
width: 180px; height: 36px;
flex-direction: column; align-items: center;
}
.modeLabel {
width: 180px; height: 18px;
color: #cee4bd; font-size: 17px; text-align: center;
}
.hint {
width: 180px; height: 18px;
color: #adb7c6; font-size: 16px; text-align: center;
}
.overlay {
position: absolute; left: 93px; top: 123px;
width: 280px; height: 220px;
background-color: #101923; border-radius: 18px;
flex-direction: column; align-items: center; justify-content: center;
}
.overText {
width: 260px; height: 40px;
color: #ffffff; font-size: 30px; text-align: center;
}
.overSub {
width: 260px; height: 30px;
color: #f3bd60; font-size: 22px; text-align: center;
}
.retry {
width: 216px; height: 56px;
background-color: #80bf55; border-radius: 12px;
color: #101923; font-size: 23px; text-align: center;
}
.overHint {
width: 260px; height: 30px;
color: #adb7c6; font-size: 17px; text-align: center;
}
.modes {
width: 240px; height: 44px;
flex-direction: row; justify-content: space-between;
}
.modeButton {
width: 116px; height: 44px;
background-color: #304252; border-radius: 10px;
color: #ffffff; font-size: 18px; text-align: center;
}
</style>