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  • 计算多边形面积

    1.多边形计算面积模型

    2.代码

    public class Point{  
        public int x;  
        public int y;  
        Point(){  
            this.x=0;  
            this.y=0;  
        }
        public int getX() {
            return x;
        }
        public int getY() {
            return y;
        }
        public void setX(int x) {
            this.x = x;
        }
        public void setY(int y) {
            this.y = y;
        }  
        
    } 
    import java.util.ArrayList;
    import java.util.List;
    
    public class CaculateArea {  
        public static float CalculateArea(List<Point> vectorPoints)
        {
            int i, iCount;
            i = 0;
            float iArea = 0;
            iCount = vectorPoints.size();
    
            for (i = 0; i < iCount; i++)
            {
                iArea = iArea + (vectorPoints.get(i).getX() * vectorPoints.get((i + 1) % iCount).getY() - vectorPoints.get((i + 1) % iCount).getX() * vectorPoints.get(i).getY());
            }
    
            return (float)Math.abs(0.5 * iArea);
        }
        
        public static void main(String args[])   
        {  
            List<Point> vectorPoints = new ArrayList<Point>();
            Point p1 = new Point();
            p1.setX(1);
            p1.setY(1);
            Point p2 = new Point();
            p2.setX(0);
            p2.setY(2);
            Point p3 = new Point();
            p3.setX(3);
            p3.setY(3);
            Point p4 = new Point();
            p4.setX(4);
            p4.setY(1);
            vectorPoints.add(p1);
            vectorPoints.add(p2);
            vectorPoints.add(p3);
            vectorPoints.add(p4);
            System.out.println("多边形面积是:"+CalculateArea(vectorPoints));  
        }  
    }  

    3 运行结果

    多边形面积是:5.0

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  • 原文地址:https://www.cnblogs.com/xiaoyezi/p/9300462.html
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