阶段10开发完成

src/store/particleStore.ts

@@ -465,8 +465,25 @@ export const useParticleStore = defineStore('particle', {
         const particleLife = c.lifeMode === 'fixed'
           ? lifeMin
           : Math.max(lifeMin, lifeMax)
-        const emissionDuration = c.mode === 'stream' ? Math.max(1 / fps, Number(c.duration) || 0) : 0
-        const end = Math.max(0, Number(c.delay) || 0) + emissionDuration + particleLife
+        const emissionDuration = c.mode === 'stream'
+          ? c.streamBehavior === 'loop'
+            ? Math.max(1 / fps, Math.ceil(Math.max(1, Number(c.loopDurationFrames) || 1)) / fps)
+            : Math.max(1 / fps, Number(c.duration) || 0)
+          : 0
+        let end = Math.max(0, Number(c.delay) || 0) + emissionDuration + particleLife
+        if (c.mode === 'stream' && c.streamBehavior === 'loop') {
+          if (c.generateLoopEndAnimation) {
+            // 结束段从循环衔接帧开始，立即停止生成；额外保留一帧用于明确记录“全部死亡”。
+            end = Math.max(0, Number(c.delay) || 0) + particleLife + 1 / fps
+          } else if (c.generateLoopStartAnimation) {
+            // 启动段从空状态自然预热到稳定循环衔接帧；寿命跨越多个周期时自动增加预热周期。
+            const warmupCycles = Math.max(1, Math.ceil(particleLife / emissionDuration))
+            end = Math.max(0, Number(c.delay) || 0) + emissionDuration * warmupCycles
+          } else {
+            // 纯循环段延迟期间保持衔接帧，之后播放一个完整周期，不追加常规生命周期尾段。
+            end = Math.max(0, Number(c.delay) || 0) + emissionDuration
+          }
+        }
         if (end > maxSec) maxSec = end
       }
       for (const spine of this.spines) {
@@ -480,7 +497,8 @@ export const useParticleStore = defineStore('particle', {
         const end = Math.max(0, Number(collider.followDuration) || 0)
         if (end > maxSec) maxSec = end
       }
-      const frames = Math.max(1, Math.ceil(maxSec * fps))
+      // totalFrames 表示快照数量；0 秒和末端点都可选，因此比末端帧编号多 1。
+      const frames = Math.max(1, Math.ceil(maxSec * fps) + 1)
       this.timeline.totalFrames = frames
       // clamp 当前帧
       if (this.timeline.frame >= frames) this.timeline.frame = frames - 1