#include <graphics.h>
 #include <math.h>
 #include <stdlib.h>
 #include <stdio.h>
 
+namespace {
+
 #define MAX_CIRCLES 30      // 圆形数量
 #define MAX_RECTS 20        // 矩形数量
 #define MAX_STARS 50        // 星星闪烁效果数量
 #define MAX_LINES 40        // 线条数量
 
 // 闪烁圆形结构
 struct FlashCircle {
     // ...
 };
 
 // ... 其他结构体、全局变量和内部函数 ...
 
+} // anonymous namespace
+
 int main() {
     // ...
 }

         // 边界反弹
-        if (circles[i].x < 0 || circles[i].x > screen_w) {
+        float max_radius = circles[i].radius * 1.3f; // 考虑脉动因子
+        if (circles[i].x - max_radius < 0 || circles[i].x + max_radius > screen_w) {
             circles[i].vx = -circles[i].vx;
-            circles[i].x = circles[i].x < 0 ? 0.0f : (float)screen_w;
+            circles[i].x = (circles[i].x < screen_w / 2) ? max_radius : (screen_w - max_radius);
         }
-        if (circles[i].y < 0 || circles[i].y > screen_h) {
+        if (circles[i].y - max_radius < 0 || circles[i].y + max_radius > screen_h) {
             circles[i].vy = -circles[i].vy;
-            circles[i].y = circles[i].y < 0 ? 0.0f : (float)screen_h;
+            circles[i].y = (circles[i].y < screen_h / 2) ? max_radius : (screen_h - max_radius);
         }

         // 边界反弹
-        if (rects[i].x < 0 || rects[i].x > screen_w) {
+        float half_w = rects[i].w / 2.0f;
+        if (rects[i].x - half_w < 0 || rects[i].x + half_w > screen_w) {
             rects[i].vx = -rects[i].vx;
-            rects[i].x = rects[i].x < 0 ? 0.0f : (float)screen_w;
+            rects[i].x = (rects[i].x < screen_w / 2) ? half_w : (screen_w - half_w);
         }
-        if (rects[i].y < 0 || rects[i].y > screen_h) {
+        float half_h = rects[i].h / 2.0f;
+        if (rects[i].y - half_h < 0 || rects[i].y + half_h > screen_h) {
             rects[i].vy = -rects[i].vy;
-            rects[i].y = rects[i].y < 0 ? 0.0f : (float)screen_h;
+            rects[i].y = (rects[i].y < screen_h / 2) ? half_h : (screen_h - half_h);
         }

 void UpdateRects(float dt) {
     for (int i = 0; i < MAX_RECTS; i++) {
         // 更新位置
         rects[i].x += rects[i].vx * dt * 60.0f;
         rects[i].y += rects[i].vy * dt * 60.0f;
         
         // ... 边界反弹代码 ...
         
         // 更新旋转
         rects[i].rotation += rects[i].rot_speed * dt * 60.0f;
         if (rects[i].rotation > 360.0f) rects[i].rotation -= 360.0f;
         if (rects[i].rotation < 0.0f) rects[i].rotation += 360.0f;
+        
+        // 更新色相（与旋转关联或独立）
+        rects[i].hue += rects[i].rot_speed * 30.0f * dt;
+        if (rects[i].hue >= 360.0f) rects[i].hue -= 360.0f;
     }
 }

-        color_t color = HSVtoRGB((float)((int)(rects[i].rotation * 2) % 360), 1.0f, 1.0f);
+        color_t color = HSVtoRGB(rects[i].hue, 1.0f, 1.0f);