PShape 2.08 使用 createShape 抛出 NullPointerException [英] PShape 2.08 throws NullPointerException with createShape

问题描述

我在 Mac 上使用 Processing 2.08.我正在尝试使用文档中给出的 createShape 函数创建一个 PShape.

I am using Processing 2.08 on mac. I am trying to create a PShape using the createShape function as given in the documentation.

PShape s;

void setup(){
  size(500,500);
  s = createShape();
  s.beginShape(QUADS);
  s.fill(0);
  s.vertex(100,100);
  s.vertex(100,300);
  s.vertex(300,300);
  s.vertex(300,100);
  s.endShape(); 
}

void draw(){
  shape(s);
}

但是这个程序抛出了 NullPointerException.在 Processing.org 论坛上查找时，我发现一个帖子说新的处理库有这个问题.

But this program throws NullPointerException. Upon looking up on the Processing.org forum I found a thread saying that the new processing library has problem with this one.

参考:https://forum.processing.org/topic/changes-to-pshape-in​​-2-08

我如何使这项工作?有什么解决方法吗?谢谢

How do I make this work? Is there any workaround? Thanks

推荐答案

来自文档:

用于存储形状的数据类型.处理当前可以加载和显示SVG(可缩放矢量图形)和 OBJ 形状.在使用形状之前，它必须使用 loadShape() 函数加载.shape() 函数用于将形状绘制到显示窗口.PShape 对象包含一组方法，链接如下，可以对形状数据.OBJ 文件只能使用 P3D 渲染器打开.

Datatype for storing shapes. Processing can currently load and display SVG (Scalable Vector Graphics) and OBJ shapes. Before a shape is used, it must be loaded with the loadShape() function. The shape() function is used to draw the shape to the display window. The PShape object contains a group of methods, linked below, that can operate on the shape data. OBJ files can only be opened using the P3D renderer.

您可以在此处找到参考:http://processing.org/reference/PShape.html

You can find the reference here: http://processing.org/reference/PShape.html

简而言之，目前，如果不先在别处创建形状，就不能使用 PShape.

In short, for now, you can't use PShape without first creating a shape elsewhere.

您可以单独创建一个图像，将其保存在文件中，然后使用 PShape 加载它.这是一个黑客，但至少在他们提出更合适的解决方案之前，它可以使用 PShape.

You could just create an image independently, save it on file and then load it with PShape. Its a hack but it makes it possible to use PShape at least until they can come up with a more proper fix.

这篇关于PShape 2.08 使用 createShape 抛出 NullPointerException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！