Confusing example for PVector copy() method

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Section

Examples

Location of the error

https://processing.org/reference/PVector_copy_.html

Describe the error

In the documentation for the copy() method of the PVector class, the following code example is given:

PVector v1, v2;

void setup() {
  size(100, 100);
  v1 = new PVector(20.0, 30.0, 40.0);
  v2 = new PVector();
  v2 = v1.copy();
  ...

While not a factual error, it seems curious to me that v2 would be instantiated as a new PVector only to be assigned the result of v1.copy(). If .copy() creates a returns a new PVector object, then the initial assignment would have no effect. This led to some confusion amongst my students who had various incorrect assumptions about how .copy() works given the example code.

Suggested correction

PVector v1, v2;

void setup() {
  size(100, 100);
  v1 = new PVector(20.0, 30.0, 40.0);
  v2 = v1.copy();
  ...

Language

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Screenshots or references

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Additional context

No response

从 issue 中链接的 PVector copy() 参考页面开始，找到其中的 Examples 部分。检查示例中的对象初始化和复制赋值，然后更新示例，使其不再执行多余的初始化。完成更改后，验证渲染后的文档示例。