java 双坐标多边形
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Polygons with Double Coordinates
提问by Shudy
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.
我有一些关于带有 Double 类型点的多边形的问题......我必须做的是，给定点，创建多边形，然后测试 1 个具体点是否在多边形内。
so I kwnow that in Java there's a class, called Polygon, and is used like that: (triangle)
所以我知道在 Java 中有一个叫做 Polygon 的类，它是这样使用的：（三角形）
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)
但是我的“多边形”必须是“Double”类型，而不是“int”（简单的例子）
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.
在我的项目中，我真的不需要把它画在小程序或类似的东西上，我只需要计算点是否在里面。
So my question is:
所以我的问题是：
Is any way to do polygons with double coordenates , that allow to calcultate if the point(double) is inside the polygon or not?
有没有办法用双坐标做多边形，允许计算点（双）是否在多边形内？
Thanks for all!!!
谢谢大家！！！
Shudy
舒迪
回答by Russell Zahniser
You can do this with Path2D.Double:
你可以用Path2D.Double做到这一点：
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:
另见这个问题：
