Java 多边形合并面积计算 - 代码示例

要合并两个多边形的面积，可以使用Java的几何库来实现。以下是一个示例代码，使用Java的Geometry库来计算两个多边形合并后的面积。\n\njava\nimport java.awt.geom.Area;\nimport java.awt.geom.Path2D;\nimport java.awt.geom.Point2D;\nimport java.util.ArrayList;\nimport java.util.List;\n\npublic class PolygonArea {\n public static void main(String[] args) {\n // 创建两个多边形的点集合\n List<Point2D.Double> polygon1Points = new ArrayList<>();\n polygon1Points.add(new Point2D.Double(0, 0));\n polygon1Points.add(new Point2D.Double(0, 5));\n polygon1Points.add(new Point2D.Double(5, 5));\n polygon1Points.add(new Point2D.Double(5, 0));\n\n List<Point2D.Double> polygon2Points = new ArrayList<>();\n polygon2Points.add(new Point2D.Double(3, 3));\n polygon2Points.add(new Point2D.Double(3, 8));\n polygon2Points.add(new Point2D.Double(8, 8));\n polygon2Points.add(new Point2D.Double(8, 3));\n\n // 创建两个多边形的路径\n Path2D.Double polygon1Path = new Path2D.Double();\n for (int i = 0; i < polygon1Points.size(); i++) {\n Point2D.Double point = polygon1Points.get(i);\n if (i == 0) {\n polygon1Path.moveTo(point.x, point.y);\n } else {\n polygon1Path.lineTo(point.x, point.y);\n }\n }\n polygon1Path.closePath();\n\n Path2D.Double polygon2Path = new Path2D.Double();\n for (int i = 0; i < polygon2Points.size(); i++) {\n Point2D.Double point = polygon2Points.get(i);\n if (i == 0) {\n polygon2Path.moveTo(point.x, point.y);\n } else {\n polygon2Path.lineTo(point.x, point.y);\n }\n }\n polygon2Path.closePath();\n\n // 创建两个多边形的区域\n Area polygon1Area = new Area(polygon1Path);\n Area polygon2Area = new Area(polygon2Path);\n\n // 合并两个多边形的区域\n polygon1Area.add(polygon2Area);\n\n // 计算合并后的多边形的面积\n double mergedArea = getArea(polygon1Area);\n\n System.out.println("合并后的多边形的面积为：" + mergedArea);\n }\n\n // 计算区域的面积\n public static double getArea(Area area) {\n return area.getPathIterator(null).getWindingRule() == Path2D.WIND_EVEN_ODD ?\n -area.getPathIterator(null).getArea() :\n area.getPathIterator(null).getArea();\n }\n}\n\n\n在上面的代码中，我们首先创建了两个多边形的点集合，然后使用Path2D.Double创建了两个多边形的路径。接下来，我们使用Area类创建了两个多边形的区域，并使用add方法将两个区域合并。最后，我们使用getArea方法计算合并后的多边形的面积。\n\n请注意，上述代码中的点坐标和多边形的顺序仅供参考，实际使用时需要根据具体情况进行修改。