polygon problem help

hello
I would like to draw 4 different polygons each polygon has its own "id" and its points in an arraylist I'm working on this code but I can not draw polygons asking for your help I thank you in advance :smash:


import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Polygon;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Polygons2 extends JPanel {

@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);


Set<POINTS> POLYGON = new LinkedHashSet<POINTS>();


//polygon 1 point 3
POLYGON.add(new POINTS(1, 50, 20));
POLYGON.add(new POINTS(1, 70, 30));
POLYGON.add(new POINTS(1, 50, 40));


//polygon 2 point 4
POLYGON.add(new POINTS(2, 100, 20));
POLYGON.add(new POINTS(2, 130, 30));
POLYGON.add(new POINTS(2, 100, 40));
POLYGON.add(new POINTS(2, 120, 30));

//polygon 3 point 6
POLYGON.add(new POINTS(3, 250, 20));
POLYGON.add(new POINTS(3, 280, 30));
POLYGON.add(new POINTS(3, 250, 40));
POLYGON.add(new POINTS(3, 230, 20));
POLYGON.add(new POINTS(3, 280, 30));
POLYGON.add(new POINTS(3, 250, 50));


//polygon 4 point 12
POLYGON.add(new POINTS(4, 350, 20));
POLYGON.add(new POINTS(4, 380, 30));
POLYGON.add(new POINTS(4, 350, 40));
POLYGON.add(new POINTS(4, 330, 20));
POLYGON.add(new POINTS(4, 380, 30));
POLYGON.add(new POINTS(4, 350, 50));
POLYGON.add(new POINTS(4, 350, 20));
POLYGON.add(new POINTS(4, 380, 30));
POLYGON.add(new POINTS(4, 330, 60));
POLYGON.add(new POINTS(4, 340, 50));
POLYGON.add(new POINTS(4, 340, 30));
POLYGON.add(new POINTS(4, 320, 30));

Map<Integer,List<POINTS>> PolygonsByID = new LinkedHashMap<Integer,List<POINTS>>();
for (POINTS n : POLYGON) {
List PolygonsForID = PolygonsByID.get(n.getID());
if (PolygonsForID == null) {
PolygonsForID = new ArrayList<POINTS>();
PolygonsByID.put(n.getID(), PolygonsForID);
Collections.sort(PolygonsForID);
}
PolygonsForID.add(n);
}
for(Map.Entry<Integer,List<POINTS>> count : PolygonsByID.entrySet()) {
int np = count.getValue().size();
System.out.println("polygon : " + count.getKey() + " points : " + np);

int n = 25 ;
int[] x = new int[n];
int[] y = new int[n];
int counter = 0;

for (POINTS pnt : POLYGON) {
x[counter] = pnt.getX();
y[counter++] = pnt.getY();
}
Polygon[] polygons = new Polygon[4];
for (int i = 0; i < polygons.length; i++) {
polygons[i] = new Polygon();
polygons[i] = new Polygon(x, y, np);
g.setColor(Color.RED);
g.drawPolygon(polygons[i]);
}
}
}



public class POINTS {

private int ID;
private int X;
private int Y;

public POINTS(
int ID, int X, int Y) {
this.ID = ID;
this.X = X;
this.Y = Y;
}

public int getX() {
return X;
}

public int getY() {
return Y;
}

public int getID() {
return ID;
}
}

public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setTitle("Polygons2");
frame.setSize(550, 550);
frame.addWindowListener(new WindowAdapter() {

@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
Container contentPane = frame.getContentPane();
contentPane.add(new Polygons2());

frame.show();
}
}

"but I can not draw polygons " is a little too short as problem description, what do you expect, what happens exactly (output?)
Please use the forum code tags around your code.

Please use the forum tags around your code code.
I do not understand:(shake):

Java Code:

import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Polygon;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Polygons2 extends JPanel {

@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);


Set<POINTS> POLYGON = new LinkedHashSet<POINTS>();


//polygon 1 point 3
POLYGON.add(new POINTS(1, 50, 20));
POLYGON.add(new POINTS(1, 70, 30));
POLYGON.add(new POINTS(1, 50, 40));


//polygon 2 point 4
POLYGON.add(new POINTS(2, 100, 20));
POLYGON.add(new POINTS(2, 130, 30));
POLYGON.add(new POINTS(2, 100, 40));
POLYGON.add(new POINTS(2, 120, 30));

//polygon 3 point 6
POLYGON.add(new POINTS(3, 250, 20));
POLYGON.add(new POINTS(3, 280, 30));
POLYGON.add(new POINTS(3, 250, 40));
POLYGON.add(new POINTS(3, 230, 20));
POLYGON.add(new POINTS(3, 280, 30));
POLYGON.add(new POINTS(3, 250, 50));


//polygon 4 point 12
POLYGON.add(new POINTS(4, 350, 20));
POLYGON.add(new POINTS(4, 380, 30));
POLYGON.add(new POINTS(4, 350, 40));
POLYGON.add(new POINTS(4, 330, 20));
POLYGON.add(new POINTS(4, 380, 30));
POLYGON.add(new POINTS(4, 350, 50));
POLYGON.add(new POINTS(4, 350, 20));
POLYGON.add(new POINTS(4, 380, 30));
POLYGON.add(new POINTS(4, 330, 60));
POLYGON.add(new POINTS(4, 340, 50));
POLYGON.add(new POINTS(4, 340, 30));
POLYGON.add(new POINTS(4, 320, 30));

Map<Integer,List<POINTS>> PolygonsByID = new LinkedHashMap<Integer,List<POINTS>>();
for (POINTS n : POLYGON) {
List PolygonsForID = PolygonsByID.get(n.getID());
if (PolygonsForID == null) {
PolygonsForID = new ArrayList<POINTS>();
PolygonsByID.put(n.getID(), PolygonsForID);
Collections.sort(PolygonsForID);
}
PolygonsForID.add(n);
}
for(Map.Entry<Integer,List<POINTS>> count : PolygonsByID.entrySet()) {
int np = count.getValue().size();
System.out.println("polygon : " + count.getKey() + " points : " + np);

int n = 25 ;
int[] x = new int[n];
int[] y = new int[n];
int counter = 0;

for (POINTS pnt : POLYGON) {
x[counter] = pnt.getX();
y[counter++] = pnt.getY();
}
Polygon[] polygons = new Polygon[4];
for (int i = 0; i < polygons.length; i++) {
polygons[i] = new Polygon();
polygons[i] = new Polygon(x, y, np);
g.setColor(Color.RED);
g.drawPolygon(polygons[i]);
}
}
}



public class POINTS {

private int ID;
private int X;
private int Y;

public POINTS(
int ID, int X, int Y) {
this.ID = ID;
this.X = X;
this.Y = Y;
}

public int getX() {
return X;
}

public int getY() {
return Y;
}

public int getID() {
return ID;
}
}

public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setTitle("Polygons2");
frame.setSize(550, 550);
frame.addWindowListener(new WindowAdapter() {

@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
Container contentPane = frame.getContentPane();
contentPane.add(new Polygons2());

frame.show();
}
}

Code:

---

<
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Polygon;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Polygons2 extends JPanel {

@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);


Set<POINTS> POLYGON = new LinkedHashSet<POINTS>();


//polygon 1 point 3
POLYGON.add(new POINTS(1, 50, 20));
POLYGON.add(new POINTS(1, 70, 30));
POLYGON.add(new POINTS(1, 50, 40));


//polygon 2 point 4
POLYGON.add(new POINTS(2, 100, 20));
POLYGON.add(new POINTS(2, 130, 30));
POLYGON.add(new POINTS(2, 100, 40));
POLYGON.add(new POINTS(2, 120, 30));

//polygon 3 point 6
POLYGON.add(new POINTS(3, 250, 20));
POLYGON.add(new POINTS(3, 280, 30));
POLYGON.add(new POINTS(3, 250, 40));
POLYGON.add(new POINTS(3, 230, 20));
POLYGON.add(new POINTS(3, 280, 30));
POLYGON.add(new POINTS(3, 250, 50));


//polygon 4 point 12
POLYGON.add(new POINTS(4, 350, 20));
POLYGON.add(new POINTS(4, 380, 30));
POLYGON.add(new POINTS(4, 350, 40));
POLYGON.add(new POINTS(4, 330, 20));
POLYGON.add(new POINTS(4, 380, 30));
POLYGON.add(new POINTS(4, 350, 50));
POLYGON.add(new POINTS(4, 350, 20));
POLYGON.add(new POINTS(4, 380, 30));
POLYGON.add(new POINTS(4, 330, 60));
POLYGON.add(new POINTS(4, 340, 50));
POLYGON.add(new POINTS(4, 340, 30));
POLYGON.add(new POINTS(4, 320, 30));

Map<Integer,List<POINTS>> PolygonsByID = new LinkedHashMap<Integer,List<POINTS>>();
for (POINTS n : POLYGON) {
List PolygonsForID = PolygonsByID.get(n.getID());
if (PolygonsForID == null) {
PolygonsForID = new ArrayList<POINTS>();
PolygonsByID.put(n.getID(), PolygonsForID);
Collections.sort(PolygonsForID);
}
PolygonsForID.add(n);
}
for(Map.Entry<Integer,List<POINTS>> count : PolygonsByID.entrySet()) {
int np = count.getValue().size();
System.out.println("polygon : " + count.getKey() + " points : " + np);

int n = 25 ;
int[] x = new int[n];
int[] y = new int[n];
int counter = 0;

for (POINTS pnt : POLYGON) {
x[counter] = pnt.getX();
y[counter++] = pnt.getY();
}
Polygon[] polygons = new Polygon[4];
for (int i = 0; i < polygons.length; i++) {
polygons[i] = new Polygon();
polygons[i] = new Polygon(x, y, np);
g.setColor(Color.RED);
g.drawPolygon(polygons[i]);
}
}
}



public class POINTS {

private int ID;
private int X;
private int Y;

public POINTS(
int ID, int X, int Y) {
this.ID = ID;
this.X = X;
this.Y = Y;
}

public int getX() {
return X;
}

public int getY() {
return Y;
}

public int getID() {
return ID;
}
}

public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setTitle("Polygons2");
frame.setSize(550, 550);
frame.addWindowListener(new WindowAdapter() {

@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
Container contentPane = frame.getContentPane();
contentPane.add(new Polygons2());

frame.show();
}
}
>

---

Code Conventions for the Java Programming Language: Contents -- especially the part about indenting code.

db

hello
excuse me where am I wrong

Code:

---

<
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Polygon;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Polygons2 extends JPanel {

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);


        Set<POINTS> POLYGON = new LinkedHashSet<POINTS>();


//polygon 1 point 3
        POLYGON.add(new POINTS(1, 50, 20));
        POLYGON.add(new POINTS(1, 70, 30));
        POLYGON.add(new POINTS(1, 50, 40));


//polygon 2 point 4
        POLYGON.add(new POINTS(2, 100, 20));
        POLYGON.add(new POINTS(2, 130, 30));
        POLYGON.add(new POINTS(2, 100, 40));
        POLYGON.add(new POINTS(2, 120, 30));

//polygon 3 point 6
        POLYGON.add(new POINTS(3, 250, 20));
        POLYGON.add(new POINTS(3, 280, 30));
        POLYGON.add(new POINTS(3, 250, 40));
        POLYGON.add(new POINTS(3, 230, 20));
        POLYGON.add(new POINTS(3, 280, 30));
        POLYGON.add(new POINTS(3, 250, 50));


//polygon 4 point 12
        POLYGON.add(new POINTS(4, 350, 20));
        POLYGON.add(new POINTS(4, 380, 30));
        POLYGON.add(new POINTS(4, 350, 40));
        POLYGON.add(new POINTS(4, 330, 20));
        POLYGON.add(new POINTS(4, 380, 30));
        POLYGON.add(new POINTS(4, 350, 50));
        POLYGON.add(new POINTS(4, 350, 20));
        POLYGON.add(new POINTS(4, 380, 30));
        POLYGON.add(new POINTS(4, 330, 60));
        POLYGON.add(new POINTS(4, 340, 50));
        POLYGON.add(new POINTS(4, 340, 30));
        POLYGON.add(new POINTS(4, 320, 30));

        Map<Integer, List<POINTS>> PolygonsByID = new LinkedHashMap<Integer, List<POINTS>>();
        for (POINTS n : POLYGON) {
            List PolygonsForID = PolygonsByID.get(n.getID());
            if (PolygonsForID == null) {
                PolygonsForID = new ArrayList<POINTS>();
                PolygonsByID.put(n.getID(), PolygonsForID);
                Collections.sort(PolygonsForID);
            }
            PolygonsForID.add(n);
        }
        for (Map.Entry<Integer, List<POINTS>> count : PolygonsByID.entrySet()) {
            int np = count.getValue().size();
            System.out.println("polygon : " + count.getKey() + " points : " + np);


            int n = 25;
            int[] x = new int[n];
            int[] y = new int[n];
            int counter = 0;

            for (POINTS pnt : POLYGON) {
                x[counter] = pnt.getX();
                y[counter++] = pnt.getY();
            }
            Polygon[] polygons = new Polygon[1];
            for (int i = 0; i < polygons.length; i++) {
                polygons[i] = new Polygon();
                polygons[i] = new Polygon(x, y, np);
                g.setColor(Color.RED);
                g.drawPolygon(polygons[i]);

            }

        }

    }

    public class POINTS {

        private int ID;
        private int X;
        private int Y;

        public POINTS(
                int ID, int X, int Y) {
            this.ID = ID;
            this.X = X;
            this.Y = Y;
        }

        public int getX() {
            return X;
        }

        public int getY() {
            return Y;
        }

        public int getID() {
            return ID;
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setTitle("Polygons2");
        frame.setSize(550, 550);
        frame.addWindowListener(new WindowAdapter() {

            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        Container contentPane = frame.getContentPane();
        contentPane.add(new Polygons2());

        frame.show();
    }
}


>

---