Get the outer border of the unordered point of polygon
Hi all,
I meet some problem regarding about polygon with unordered points of polygon. I got some Point of polygon from source data (ENC file format) that cannot be changed. So, i want to look some help from you all. how to get the outer border of polygon?
Here is the paint function that i had created :
public void paint(Graphics g) {
super.paint(g);
Polygon p = new Polygon();
String point = "3331,2305;3317,2332;3317,2356;3310,2356;3302,2355;3331,2305;3317,2286;3317,2281;3392,2281;3392,2356;3317,2356;"
+ "3317,2332;3331,2305;3303,2278;3312,2281;3317,2281;3317,2286;3303,2278;3254,2313;3249,2309;3249,2281;"+
"3295,2281;3303,2278;3295,2281;3249,2281;3242,2241;3242,2206;3317,2206;3317,2281;3312,2281;3249,2309;"
+ "3233,2159;3344,2079;3317,2102;3317,2131;3275,2131;3242,2156;3242,2206;3242,2241;3249,2281;3344,2079;"+
"3349,2078;3352,2074;3361,2093;3385,2078;3392,2078;3392,2131;3317,2131;3317,2102;3344,2079;3352,2074;"
+ "3349,2078;3361,2093;3390,2070;3650,2070;3656,2078;3617,2078;3542,2078;3467,2078;3392,2078;3385,2078;"+
"3650,2070;3731,2143;3722,2141;3714,2131;3620,2131;3617,2131;3617,2078;3656,2078;3731,2143;3565,2249;"
+ "3617,2211;3617,2206;3624,2206;3620,2131;3714,2131;3722,2141;3565,2249;3494,2296;3513,2281;3467,2281;"+
"3467,2206;3542,2206;3542,2261;3565,2249;3542,2261;3542,2206;3617,2206;3617,2211;3494,2296;3465,2315;"
+ "3467,2310;3467,2281;3513,2281;3465,2315;3390,2365;3313,2365;3302,2355;3310,2356;3317,2356;3392,2356;"+
"3398,2356;3396,2281;3467,2281;3467,2310;3392,2356;3392,2281;3396,2281;3398,2356;3392,2281;3317,2281;"
+ "3317,2206;3392,2206;3392,2281;3392,2206;3467,2206;3467,2281;3396,2281;3317,2206;3242,2206;3242,2156;"+
"3275,2131;3317,2131;3317,2206;3317,2131;3392,2131;3392,2206;3392,2206;3392,2131;3467,2131;3467,2206;"
+ "3542,2206;3467,2206;3467,2131;3542,2131;3542,2206;3542,2131;3617,2131;3617,2206;3624,2206;3617,2206;"+
"3617,2131;3620,2131;3392,2131;3392,2078;3467,2078;3467,2131;3542,2131;3467,2131;3467,2078;3542,2078;" +
"3542,2131;3542,2078;3617,2078;3617,2131";
Scanner read = new Scanner(point).useDelimiter("[;,]");
Graphics2D g2 = (Graphics2D)g;
g2.setColor(Color.BLACK);
while (read.hasNextInt()) {
int x = (int)read.nextInt()/10;
int y = (int)read.nextInt()/10;
p.addPoint(x,y);
read.close();
g2.drawPolygon(p1);
}Thanks in advance..
regards,
tenlee
Edited by: tenly on Aug 18, 2009 10:46 PM
Hi,
Just out of curiosity I gave it a shot. It seems that only on the upper left side the result is a bit different than the result that you expect (according to the picture with the red dots).
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Polygon;
import java.awt.Shape;
import java.awt.geom.Area;
import java.awt.geom.Path2D;
import java.awt.geom.PathIterator;
import java.util.Scanner;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class OuterShape extends JPanel {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new OuterShape().createGUI();
private final Shape outerShape;
private final Polygon polygon;
outerShape = createOuterShape();
polygon = createPolygon();
this.setOpaque(true);
this.setBackground(Color.GREEN);
private static final long serialVersionUID = 1L;
private static String point = "3331,2305;3317,2332;3317,2356;3310,2356;3302,2355;3331,2305;3317,2286;3317,2281;3392,2281;3392,2356;3317,2356;"
+ "3317,2332;3331,2305;3303,2278;3312,2281;3317,2281;3317,2286;3303,2278;3254,2313;3249,2309;3249,2281;"
+ "3295,2281;3303,2278;3295,2281;3249,2281;3242,2241;3242,2206;3317,2206;3317,2281;3312,2281;3249,2309;"
+ "3233,2159;3344,2079;3317,2102;3317,2131;3275,2131;3242,2156;3242,2206;3242,2241;3249,2281;3344,2079;"
+ "3349,2078;3352,2074;3361,2093;3385,2078;3392,2078;3392,2131;3317,2131;3317,2102;3344,2079;3352,2074;"
+ "3349,2078;3361,2093;3390,2070;3650,2070;3656,2078;3617,2078;3542,2078;3467,2078;3392,2078;3385,2078;"
+ "3650,2070;3731,2143;3722,2141;3714,2131;3620,2131;3617,2131;3617,2078;3656,2078;3731,2143;3565,2249;"
+ "3617,2211;3617,2206;3624,2206;3620,2131;3714,2131;3722,2141;3565,2249;3494,2296;3513,2281;3467,2281;"
+ "3467,2206;3542,2206;3542,2261;3565,2249;3542,2261;3542,2206;3617,2206;3617,2211;3494,2296;3465,2315;"
+ "3467,2310;3467,2281;3513,2281;3465,2315;3390,2365;3313,2365;3302,2355;3310,2356;3317,2356;3392,2356;"
+ "3398,2356;3396,2281;3467,2281;3467,2310;3392,2356;3392,2281;3396,2281;3398,2356;3392,2281;3317,2281;"
+ "3317,2206;3392,2206;3392,2281;3392,2206;3467,2206;3467,2281;3396,2281;3317,2206;3242,2206;3242,2156;"
+ "3275,2131;3317,2131;3317,2206;3317,2131;3392,2131;3392,2206;3392,2206;3392,2131;3467,2131;3467,2206;"
+ "3542,2206;3467,2206;3467,2131;3542,2131;3542,2206;3542,2131;3617,2131;3617,2206;3624,2206;3617,2206;"
+ "3617,2131;3620,2131;3392,2131;3392,2078;3467,2078;3467,2131;3542,2131;3467,2131;3467,2078;3542,2078;"
+ "3542,2131;3542,2078;3617,2078;3617,2131";
public void createGUI() {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(this);
frame.setSize(600, 600);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
private Shape createOuterShape() {
Scanner read = new Scanner(point).useDelimiter("[;,]");
Path2D pathOne = new Path2D.Double(Path2D.WIND_NON_ZERO), pathTwo = new Path2D.Double(
Path2D.WIND_EVEN_ODD);
boolean opened = false;
while (read.hasNextInt()) {
int x = (int) read.nextInt();
int y = (int) read.nextInt();
if (opened) {
pathOne.lineTo(x, y);
pathTwo.lineTo(x, y);
} else {
pathOne.moveTo(x, y);
pathTwo.moveTo(x, y);
opened = true;
pathOne.closePath();
pathTwo.closePath();
read.close();
Area area = new Area(pathOne);
area.add(new Area(pathTwo));
if (!area.isSingular()) {
Area newArea = new Area();
Path2D singlePath = new Path2D.Double();
PathIterator pi = area.getPathIterator(null);
double[] coords = new double[6];
while (!pi.isDone()) {
int type = pi.currentSegment(coords);
switch (type) {
case PathIterator.SEG_MOVETO:
newArea.add(new Area(singlePath));
newArea = new Area();
singlePath.moveTo(coords[0], coords[1]);
break;
case PathIterator.SEG_CLOSE:
singlePath.closePath();
break;
case PathIterator.SEG_CUBICTO:
singlePath.curveTo(coords[0], coords[1], coords[2],
coords[3], coords[4], coords[5]);
break;
case PathIterator.SEG_LINETO:
singlePath.lineTo(coords[0], coords[1]);
break;
case PathIterator.SEG_QUADTO:
singlePath.quadTo(coords[0], coords[1], coords[2],
coords[3]);
break;
newArea.add(new Area(singlePath));
pi.next();
area = newArea;
return area;
private Polygon createPolygon() {
Polygon polygon = new Polygon();
Scanner read = new Scanner(point).useDelimiter("[;,]");
while (read.hasNextInt()) {
int x = (int) read.nextInt();
int y = (int) read.nextInt();
polygon.addPoint(x, y);
read.close();
return polygon;
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g.create();
g2.translate(-3200, -2000);
g2.setColor(Color.WHITE);
g2.fill(outerShape);
g2.setColor(Color.BLACK);
g2.draw(polygon);
}Piet
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