1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
"use strict"
const $ = (s) => document.querySelector(s)
const stage = $("#stage")
const world = $("#world")
const splash = $("#splash")
const flash = $("#flash")
const startBtn = $("#start")
const GAP = 10
let TILE = window.matchMedia("(max-width: 700px)").matches ? 200 : 360
const ARROW_SVG = {
N: '<svg viewBox="0 0 24 24"><path d="M5 15l7-8 7 8" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>',
E: '<svg viewBox="0 0 24 24"><path d="M9 5l8 7-8 7" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>',
S: '<svg viewBox="0 0 24 24"><path d="M5 9l7 8 7-8" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>',
W: '<svg viewBox="0 0 24 24"><path d="M15 5l-8 7 8 7" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>',
}
const DELTA = { N: [0, -1], E: [1, 0], S: [0, 1], W: [-1, 0] }
const tiles = new Map()
const coordOf = new Map()
let cur = null
let curExits = []
let fetchSeq = 0
let panX = 0
let panY = 0
let drag = null
const key = (x, y) => `${x},${y}`
function applyPan() {
world.style.transform = `translate(${panX}px, ${panY}px)`
}
function center() {
if (!cur) return
const cx = cur.x * (TILE + GAP) + TILE / 2
const cy = cur.y * (TILE + GAP) + TILE / 2
panX = window.innerWidth / 2 - cx
panY = window.innerHeight / 2 - cy
applyPan()
}
function addTile(info, x, y) {
const el = document.createElement("div")
el.className = "tile"
el.dataset.id = info.id
el.dataset.x = x
el.dataset.y = y
el.style.left = x * (TILE + GAP) + "px"
el.style.top = y * (TILE + GAP) + "px"
el.style.width = TILE + "px"
el.style.height = TILE + "px"
const img = document.createElement("img")
img.src = info.thumb
img.alt = info.title || "photo"
img.loading = "lazy"
el.appendChild(img)
world.appendChild(el)
requestAnimationFrame(() => el.classList.add("lock"))
tiles.set(key(x, y), { el, info })
coordOf.set(info.id, { x, y })
return el
}
function setCurrent(id, x, y) {
for (const t of tiles.values()) t.el.classList.remove("current")
cur = { id, x, y }
tiles.get(key(x, y)).el.classList.add("current")
curExits = []
renderNav()
center()
fetchExits(id)
}
function flashText(text) {
flash.textContent = text
flash.classList.remove("show")
void flash.offsetWidth
flash.classList.add("show")
clearTimeout(flashText._t)
flashText._t = setTimeout(() => flash.classList.remove("show"), 1600)
}
function renderNav() {
if (!cur) return
const tileEl = tiles.get(key(cur.x, cur.y)).el
tileEl.querySelectorAll(".nav").forEach((n) => n.remove())
const nav = document.createElement("div")
nav.className = "nav"
for (const ex of curExits) {
const b = document.createElement("button")
b.className = "nav-btn"
b.dataset.dir = ex.dir
b.innerHTML = ARROW_SVG[ex.dir]
const lab = document.createElement("span")
lab.className = "nav-label"
lab.textContent = ex.path.name
b.appendChild(lab)
b.addEventListener("pointerdown", (e) => e.stopPropagation())
b.addEventListener("click", (e) => { e.stopPropagation(); move(ex.dir) })
nav.appendChild(b)
}
tileEl.appendChild(nav)
}
async function fetchExits(id) {
const seq = ++fetchSeq
try {
const r = await fetch(`/api/exits/${id}`)
if (!r.ok) return
const data = await r.json()
if (seq !== fetchSeq || !cur || cur.id !== id) return
curExits = data.exits || []
renderNav()
} catch { /* ignore */ }
}
async function move(dir) {
const ex = curExits.find((e) => e.dir === dir)
if (!ex) return
flashText(ex.path.name)
const [dx, dy] = DELTA[dir]
const nx = cur.x + dx
const ny = cur.y + dy
const occupant = tiles.get(key(nx, ny))
if (occupant) {
setCurrent(occupant.info.id, nx, ny)
return
}
const at = coordOf.get(ex.next.id)
if (at) {
setCurrent(ex.next.id, at.x, at.y)
} else {
addTile(ex.next, nx, ny)
setCurrent(ex.next.id, nx, ny)
}
}
stage.addEventListener("pointerdown", (e) => {
if (e.target.closest(".nav-btn")) return
drag = { x: e.clientX, y: e.clientY, px: panX, py: panY, moved: false, tile: e.target.closest(".tile") }
world.style.transition = "none"
stage.setPointerCapture(e.pointerId)
})
stage.addEventListener("pointermove", (e) => {
if (!drag) return
const dx = e.clientX - drag.x
const dy = e.clientY - drag.y
if (!drag.moved && Math.hypot(dx, dy) > 5) drag.moved = true
if (drag.moved) {
panX = drag.px + dx
panY = drag.py + dy
applyPan()
}
})
stage.addEventListener("pointerup", (e) => {
if (!drag) return
const wasDrag = drag.moved
const tile = drag.tile
drag = null
world.style.transition = ""
if (wasDrag || !tile) return
const x = Number(tile.dataset.x)
const y = Number(tile.dataset.y)
const info = tiles.get(key(x, y)).info
if (cur && cur.id === info.id) return
setCurrent(info.id, x, y)
})
addEventListener("keydown", (e) => {
const map = { ArrowUp: "N", ArrowRight: "E", ArrowDown: "S", ArrowLeft: "W" }
const dir = map[e.key]
if (dir) {
e.preventDefault()
move(dir)
}
})
addEventListener("resize", center)
startBtn.addEventListener("click", async () => {
splash.classList.add("hide")
try {
const r = await fetch("/api/random")
const data = await r.json()
addTile(data.photo, 0, 0)
setCurrent(data.photo.id, 0, 0)
} catch {
flashText("could not reach the library")
}
})
|
