feat: 扩大体量参数范围

src/main.ts

@@ -86,7 +86,14 @@ app.innerHTML = `
               <output id="volume-value">100%</output>
             </span>
             <span class="control__hint">结果相对原文的总长度</span>
-            <input id="volume-control" type="range" min="85" max="115" value="100" />
+            <input
+              id="volume-control"
+              type="range"
+              min="10"
+              max="1000"
+              step="10"
+              value="100"
+            />
           </label>
 
           <label class="control" for="disorder-control">

src/mosaic.test.ts

@@ -74,6 +74,22 @@ describe('generateMosaic', () => {
     expect(ratio).toBeLessThanOrEqual(1.03)
   })
 
+  it('支持将体量压缩到 10% 或膨胀到 1000%', () => {
+    const compressed = generateMosaic(SOURCE, [], {
+      volume: 10,
+      disorder: 0,
+      seed: 42,
+    })
+    const expanded = generateMosaic(SOURCE, [], {
+      volume: 1000,
+      disorder: 0,
+      seed: 42,
+    })
+
+    expect(compressed.outputLength).toBe(Math.round(compressed.inputLength * 0.1))
+    expect(expanded.outputLength).toBe(expanded.inputLength * 10)
+  })
+
   it('相同种子可复现，不同种子会重新侵蚀', () => {
     const candidates = selectKeywords(SOURCE, 14, 1)
     const first = generateMosaic(SOURCE, candidates, {