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26 lines
554 B
Markdown
26 lines
554 B
Markdown
# Vector2::SqrMagnitude
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```cpp
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static float SqrMagnitude(const Vector2& v)
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float SqrMagnitude() const
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```
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计算向量长度的平方。比 Magnitude 更快，避免了开方运算。
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**静态版本参数：**
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- `v` - 要计算长度的向量
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**实例版本：** 计算当前向量的长度平方。
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**返回：** `float` - 向量长度平方 x * x + y * y
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**复杂度：** O(1)
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**示例：**
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```cpp
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Vector2 v(3.0f, 4.0f);
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float sqlen = v.SqrMagnitude(); // 25.0f
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float sqlen2 = Vector2::SqrMagnitude(v); // 25.0f
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```
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