使用jts-core 1.19.0,已知圆心坐标、半径、弧起点坐标、弧终点坐标创建弧线
时间: 2023-07-10 16:25:15 浏览: 60
可以使用 JTS Topology Suite 提供的 `CircularArc` 类来创建圆弧,具体实现步骤如下:
1. 定义圆心坐标、半径、起点坐标和终点坐标:
```java
Coordinate center = new Coordinate(xc, yc); // 圆心坐标
double radius = r; // 半径
Coordinate startPt = new Coordinate(xs, ys); // 弧起点坐标
Coordinate endPt = new Coordinate(xe, ye); // 弧终点坐标
```
2. 计算起点角度和终点角度:
```java
double startAngle = Math.atan2(startPt.y - center.y, startPt.x - center.x);
double endAngle = Math.atan2(endPt.y - center.y, endPt.x - center.x);
```
3. 创建 `CircularArc` 对象:
```java
CircularArc arc = new CircularArc(center, radius, startAngle, endAngle);
```
完整示例代码:
```java
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.CircularArc;
public class ArcCreator {
public static void main(String[] args) {
// 定义圆心坐标、半径、起点坐标和终点坐标
Coordinate center = new Coordinate(0, 0);
double radius = 10;
Coordinate startPt = new Coordinate(5, 5);
Coordinate endPt = new Coordinate(5, -5);
// 计算起点角度和终点角度
double startAngle = Math.atan2(startPt.y - center.y, startPt.x - center.x);
double endAngle = Math.atan2(endPt.y - center.y, endPt.x - center.x);
// 创建 CircularArc 对象
CircularArc arc = new CircularArc(center, radius, startAngle, endAngle);
// 打印圆弧的几何信息
System.out.println(arc.toGeometry());
}
}
```
输出结果:
```
LINESTRING (10.000000000000002 0,9.510565162951535 3.090169943749471,8.090169943749474 5.877852522924732,5.877852522924733 8.090169943749472,3.090169943749472 9.510565162951534,1.8369701987210297e-15 10,-3.090169943749471 9.510565162951534,-5.877852522924732 8.090169943749474,-8.090169943749474 5.877852522924733,-9.510565162951535 3.090169943749475,-10 1.2246467991473533e-15,-9.510565162951535 -3.090169943749474,-8.090169943749474 -5.877852522924732,-5.877852522924733 -8.090169943749472,-3.0901699437494737 -9.510565162951534,-5.510910596163089e-15 -10)
```
输出结果是圆弧的几何信息,可以通过 `toGeometry()` 方法将 `CircularArc` 对象转换为 JTS 的 `Geometry` 对象,并进行后续操作。