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XCEngine/docs/api/math/rectint/gettop.md

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# RectInt::GetTop
```cpp
int32_t GetTop() const
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```
获取矩形上边界。
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**返回:** `int32_t` - 上边界坐标 (y)
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**复杂度:** O(1)
**示例:**
```cpp
RectInt rect(10, 20, 100, 50);
int32_t top = rect.GetTop(); // 20
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```