具有双坐标的多边形 [英] Polygons with Double Coordinates

问题描述

我有一些关于多边形的问题，它们是Double type ... Point
我必须做的是给出点，创建多边形，然后测试一个具体点是否在多边形内。

所以我知道在Java中有一个叫Polygon的类，它被这样使用：（triangle）

  int valoresX [] = {100，150，200}; 
 int valoresY [] = {100，200，100}; 
 int n = valoresX.length; 
多边形城市=新的多边形（valoresX，valoresY，n）; 
  

但是我的多边形必须是Double类型，而不是int ）

  Double valoresX [] = {1000.10,150.10,200.10}; 
 Double valoresY [] = {100.10，200.10，100.10}; 
  

在我的项目中，我不需要在小程序或类似程序上绘制它，我只需要计算如果点在里面或不是。

所以我的问题是：

有什么办法做多边形双重协调，允许计算如果点（双）在多边形内部吗？

感谢所有!!!

Shudy

解决方案

您可以使用 Path2D.Double ：

  Path2D path = new Path2D.Double（）; 
 
 path.moveTo（valoresX [0]，valoresY [0]）; （int i = 1; i< valoresX.length; ++ i）{
 path.lineTo（valoresX [i]，valoresY [i]）; 
 
} 
 path.closePath（）; 
  

另请参阅这个问题：

< a href =https://stackoverflow.com/questions/11465330/implementing-polygon2d-in-java-2d>在Java 2D中实现Polygon2D

I have some questions about Polygons with points of Double type... What I have to do, is given points, create the polygon, and then, test if 1 concrete point is inside the polygon or not.

so I kwnow that in Java there's a class, called Polygon, and is used like that: (triangle)

int valoresX[] = { 100, 150, 200 };
int valoresY[] = { 100, 200, 100 };
int n = valoresX.length;
Polygon city= new Polygon(valoresX,valoresY,n);

But my "polygons" has to be of "Double" type, not "int" (easy example)

Double valoresX[] = { 1000.10, 150.10, 200.10 };
Double valoresY[] = { 100.10, 200.10, 100.10 };

In my project i dont really need to paint it on an applet or similar, I just need to calculate if the point is inside or not.

So my question is:

Is any way to do polygons with double coordenates , that allow to calcultate if the point(double) is inside the polygon or not?

Thanks for all!!!

Shudy

解决方案

You can do this with Path2D.Double:

Path2D path = new Path2D.Double();

path.moveTo(valoresX[0], valoresY[0]);
for(int i = 1; i < valoresX.length; ++i) {
   path.lineTo(valoresX[i], valoresY[i]);
}
path.closePath();

See also this question:

Implementing Polygon2D in Java 2D

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