first-commit

skills/html-ppt/assets/animations/fx/word-cascade.js

@@ -0,0 +1,47 @@
+(function(){
+  window.HPX = window.HPX || {};
+  window.HPX['word-cascade'] = function(el){
+    const U = window.HPX._u;
+    const k = U.canvas(el), ctx = k.ctx;
+    const pal = U.palette(el);
+    const WORDS = ['AI','知识','Graph','Claude','LLM','Agent','Vector','RAG','Token','神经',
+      'Prompt','Chain','Skill','Code','Cloud','GPU','Flow','推理','Data','Model'];
+    let items = [];
+    let last = -1;
+    let piles = {}; // column -> stack height
+    const stop = U.loop((t) => {
+      ctx.clearRect(0,0,k.w,k.h);
+      if (t - last > 0.18){
+        last = t;
+        const w = WORDS[(Math.random()*WORDS.length)|0];
+        items.push({
+          text: w, x: U.rand(40, k.w-40), y: -20,
+          vy: 0, c: pal[(Math.random()*pal.length)|0],
+          size: U.rand(16,26), landed: false
+        });
+      }
+      ctx.textAlign='center'; ctx.textBaseline='middle';
+      for (const it of items){
+        if (!it.landed){
+          it.vy += 0.4;
+          it.y += it.vy;
+          const col = Math.round(it.x/60);
+          const floor = k.h - (piles[col]||0) - it.size*0.6;
+          if (it.y >= floor){
+            it.y = floor; it.landed = true;
+            piles[col] = (piles[col]||0) + it.size*1.1;
+            if ((piles[col]||0) > k.h*0.8) piles[col] = 0; // reset if too high
+          }
+        }
+        ctx.fillStyle = it.c;
+        ctx.font = `700 ${it.size}px system-ui,sans-serif`;
+        ctx.fillText(it.text, it.x, it.y);
+      }
+      // prune old landed
+      if (items.length > 120){
+        items = items.filter(i => !i.landed).concat(items.filter(i=>i.landed).slice(-60));
+      }
+    });
+    return { stop(){ stop(); k.destroy(); } };
+  };
+})();