get Rounded GeneralPath - Java 2D Graphics

Java examples for 2D Graphics:Path

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Description

get Rounded GeneralPath

Demo Code


//package com.java2s;
import java.awt.Point;
import java.awt.Polygon;
import java.awt.geom.GeneralPath;
import java.util.ArrayList;
import java.util.List;

public class Main {
    public static GeneralPath getRoundedGeneralPath(Polygon polygon) {
        List<int[]> l = new ArrayList<int[]>();
        for (int i = 0; i < polygon.npoints; i++) {
            l.add(new int[] { polygon.xpoints[i], polygon.ypoints[i] });
        }//from   w  w w . ja  v  a 2  s.c  om
        return getRoundedGeneralPath(l);
    }

    public static GeneralPath getRoundedGeneralPath(List<int[]> l) {
        List<Point> list = new ArrayList<Point>();
        for (int[] point : l) {
            list.add(new Point(point[0], point[1]));
        }
        return getRoundedGeneralPathFromPoints(list);
    }

    public static GeneralPath getRoundedGeneralPathFromPoints(List<Point> l) {
        l.add(l.get(0));
        l.add(l.get(1));
        GeneralPath p = new GeneralPath();
        p.moveTo(l.get(0).x, l.get(0).y);
        for (int pointIndex = 1; pointIndex < l.size() - 1; pointIndex++) {
            Point p1 = l.get(pointIndex - 1);
            Point p2 = l.get(pointIndex);
            Point p3 = l.get(pointIndex + 1);
            Point mPoint = calculatePoint(p1, p2);
            p.lineTo(mPoint.x, mPoint.y);
            mPoint = calculatePoint(p3, p2);
            p.curveTo(p2.x, p2.y, p2.x, p2.y, mPoint.x, mPoint.y);
        }
        return p;
    }

    private static Point calculatePoint(Point p1, Point p2) {
        float arcSize = 10;
        double d1 = Math.sqrt(Math.pow(p1.x - p2.x, 2)
                + Math.pow(p1.y - p2.y, 2));
        double per = arcSize / d1;
        double d_x = (p1.x - p2.x) * per;
        double d_y = (p1.y - p2.y) * per;
        int xx = (int) (p2.x + d_x);
        int yy = (int) (p2.y + d_y);
        return new Point(xx, yy);
    }
}

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