v0.01

js/input.js

@@ -0,0 +1,65 @@
+// 输入：IWBT 经典键位（Shift 跳 / Z 跳 / X 射击 / R 重来）
+const BIND = {
+  left:    ['ArrowLeft', 'KeyA'],
+  right:   ['ArrowRight', 'KeyD'],
+  up:      ['ArrowUp', 'KeyW'],
+  down:    ['ArrowDown', 'KeyS'],
+  jump:    ['ShiftLeft', 'ShiftRight', 'Space', 'KeyZ', 'KeyN'],
+  shoot:   ['KeyX', 'KeyJ', 'KeyC', 'KeyM'],
+  suicide: ['KeyR'],          // IWBT 标准：自杀并回到最近存档点
+  restart: ['Backspace'],     // 整关从头再来（放弃所有存档点）
+  pause:   ['Escape', 'KeyP'],
+  menu:    ['KeyQ'],
+};
+
+const down = new Set();      // 当前按住的原始 code
+const now = {};              // action 是否按下
+const prev = {};             // 上一帧
+const blocked = new Set(['Space', 'ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight', 'Tab']);
+
+export const Input = {
+  enabled: true,
+  /** 是否按下 */
+  is(action) { return !!now[action]; },
+  /** 本帧刚按下 */
+  hit(action) { return !!now[action] && !prev[action]; },
+  /** 本帧刚松开 */
+  released(action) { return !now[action] && !!prev[action]; },
+  raw(code) { return down.has(code); },
+  anyHit() { for (const k in now) if (now[k] && !prev[k]) return true; return false; },
+
+  clear() {
+    down.clear();
+    for (const k in now) now[k] = false;
+    for (const k in prev) prev[k] = false;
+  },
+
+  /** 每逻辑帧末尾调用 */
+  endFrame() {
+    for (const k in now) prev[k] = now[k];
+  },
+};
+
+function refresh() {
+  for (const act in BIND) {
+    let v = false;
+    for (const c of BIND[act]) if (down.has(c)) { v = true; break; }
+    now[act] = Input.enabled ? v : false;
+  }
+}
+
+addEventListener('keydown', e => {
+  if (blocked.has(e.code)) e.preventDefault();
+  if (e.repeat) return;
+  down.add(e.code);
+  refresh();
+});
+addEventListener('keyup', e => {
+  down.delete(e.code);
+  refresh();
+});
+addEventListener('blur', () => { down.clear(); refresh(); });
+
+// 初始化
+for (const act in BIND) { now[act] = false; prev[act] = false; }
+export const ACTIONS = Object.keys(BIND);