好的,这里给出几个例子的代码和输出结果:
例1:
直线endpoints: `(0, 0)`, `(1, 1)`
检查点: `(2, 0)`
```cpp
Line l; 
l.a = Vector2(0, 0); 
l.b = Vector2(1, 1);
Vector2 p(2, 0);
bool onLeft = on_left(l, p); 
// onLeft = true
```
例2:
直线endpoints: `(0, 0)`, `(1, 1)`
检查点: `(-2, 0)`
```cpp
Line l;
l.a = Vector2(0, 0);  
l.b = Vector2(1, 1);
Vector2 p(-2, 0);
bool onLeft = on_left(l, p);
// onLeft = false 
```
例3:
直线endpoints: `(0, 0)`, `(1, 1)` 
检查点: `(1, 0)`  
```cpp
Line l;  
l.a = Vector2(0, 0);
l.b = Vector2(1, 1); 
Vector2 p(1, 0);
bool onLeft = on_left(l, p);
// onLeft = true
```
例4:
直线endpoints: `(0, 0)`, `(1, 1)` 
检查点: `(0.5, 0.5)`  
```cpp
Line l;
l.a = Vector2(0, 0); 
l.b = Vector2(1, 1);
Vector2 p(0.5, 0.5); 
bool onLeft = on_left(l, p);
// onLeft = true 
```
以上是几个例子的代码实现和输出结果。通过编写代码模拟运行,可以加深理解,特别是编译器会检查代码的语法和逻辑错误,这也有助于debug。请让我知道如果您有任何其他问题!
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