Changing the color of a graph draw in java

Hi,
I really need help in changing the color of a 3d graph. We were given the code of the graph and asked to change its color and also shape by adding checkboxes. I am a beginner at java so I learned how to use checkboxes by example and did a program that give different shape and different colors using checkboxes and it work. Unfortunately, I couldn’t make it work for the given code. I don’t know what is the problem. Here is the given code:
java code

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Color;
//import java.awt.BorderLayout;
//import javax.swing.*;

class Point3D
{
    public int x, y, z;
    public Point3D( int X, int Y, int Z )
    {
        x = X; y = Y; z = Z;
    }
}

class Edge
{
    public int a, b;
    public Edge( int A, int B )
    {
        a = A; b = B;
    }
}

public class WireframeViewer extends Applet
implements MouseListener, MouseMotionListener
{
    int width, height;
    int mx, my; // the most recently recorded mouse coordinates
    Image backbuffer;
    Graphics backg;
    int azimuth = 35, elevation = 30;
    Point3D[] vertices;
    Edge[] edges;
    Button okButton;
    //Button okButton1;
    CheckboxGroup radioGroup;
    Checkbox radio1;
    Checkbox radio2;
    Checkbox radio3;
    CheckboxGroup shapeGroup;
    Checkbox shape1;
    Checkbox shape2;
    Checkbox shape3;
    //Image backbuffer;
    //Graphics backg;
    @Override
public void init() {
    width = getSize().width;
    height = getSize().height;
    vertices = new Point3D[ 8 ];
    vertices[0] = new Point3D( -1, -1, -1 );
    vertices[1] = new Point3D( -1, -1, 1 );
    vertices[2] = new Point3D( -1, 1, -1 );
    vertices[3] = new Point3D( -1, 1, 1 );
    vertices[4] = new Point3D( 1, -1, -1 );
    vertices[5] = new Point3D( 1, -1, 1 );
    vertices[6] = new Point3D( 1, 1, -1 );
    vertices[7] = new Point3D( 1, 1, 1 );
    edges = new Edge[ 12 ];
    edges[ 0] = new Edge( 0, 1 );
    edges[ 1] = new Edge( 0, 2 );
    edges[ 2] = new Edge( 0, 4 );
    edges[ 3] = new Edge( 1, 3 );
    edges[ 4] = new Edge( 1, 5 );
    edges[ 5] = new Edge( 2, 3 );
    edges[ 6] = new Edge( 2, 6 );
    edges[ 7] = new Edge( 3, 7 );
    edges[ 8] = new Edge( 4, 5 );
    edges[ 9] = new Edge( 4, 6 );
    edges[10] = new Edge( 5, 7 );
    edges[11] = new Edge( 6, 7 );
    backbuffer = createImage( width, height );
    backg = backbuffer.getGraphics();
    drawWireframe( backg );
    addMouseListener( this );
    addMouseMotionListener( this );
    //setLayout(new FlowLayout());
    okButton = new Button("Color");
    //okButton1 = new Button("Shape");
    radioGroup = new CheckboxGroup();
    radio1 = new Checkbox("Red", radioGroup,false);
    radio2 = new Checkbox("Blue", radioGroup,true);
    radio3 = new Checkbox("Green", radioGroup,false);
    shapeGroup = new CheckboxGroup();
    shape1 = new Checkbox("Rectangle", shapeGroup,false);
    shape2 = new Checkbox("Circle", shapeGroup,true);
    shape3 = new Checkbox("Square", shapeGroup,false);
    add(okButton);
   // add(okButton1);
    add(shape1);
    add(shape2);
    add(shape3);
    add(radio1);
    add(radio2);
    add(radio3);
 //   okButton.addActionListener((ActionListener) this);
   // okButton1.addActionListener((ActionListener) this);
    //okButton.setBounds(20,20,100,30);
    //okButton1.setBounds(20,40 , 100,30);
}

    void drawWireframe( Graphics g ) {
// compute coefficients for the projection

double theta = Math.PI * azimuth / 180.0;
double phi = Math.PI * elevation / 180.0;
float cosT = (float)Math.cos( theta ), sinT = (float)Math.sin( theta );
float cosP = (float)Math.cos( phi ), sinP = (float)Math.sin( phi );
float cosTcosP = cosT*cosP, cosTsinP = cosT*sinP,
sinTcosP = sinT*cosP, sinTsinP = sinT*sinP;
// project vertices onto the 2D viewport
Point[] points;
points = new Point[ vertices.length ];
int j;
int scaleFactor = width/4;
float near = 3; // distance from eye to near plane
float nearToObj = 1.5f; // distance from near plane to center of object
for ( j = 0; j < vertices.length; ++j ) {
int x0 = vertices[j].x;
int y0 = vertices[j].y;
int z0 = vertices[j].z;
// compute an orthographic projection
float x1 = cosT*x0 + sinT*z0;
float y1 = -sinTsinP*x0 + cosP*y0 + cosTsinP*z0;
// now adjust things to get a perspective projection
float z1 = cosTcosP*z0 - sinTcosP*x0 - sinP*y0;
x1 = x1*near/(z1+near+nearToObj);
y1 = y1*near/(z1+near+nearToObj);
// the 0.5 is to round off when converting to int
points[j] = new Point(
(int)(width/2 + scaleFactor*x1 + 0.5),
(int)(height/2 - scaleFactor*y1 + 0.5)
);
}

// draw the wireframe

g.setColor( Color.white );
g.fillRect( 0, 0, width, height );
//if (radio1.getLabel()=="Red") g.setColor( Color.red );
//else if (radio2.getLabel()=="Blue") g.setColor(Color.BLUE);
//else g.setColor(Color.green);
g.setColor(Color.MAGENTA);

for ( j = 0; j < edges.length; ++j ) {
g.drawLine(
points[ edges[j].a ].x, points[ edges[j].a ].y,
points[ edges[j].b ].x, points[ edges[j].b ].y
);
}
    }
public void mouseEntered( MouseEvent e ) { }
public void mouseExited( MouseEvent e ) { }
public void mouseClicked( MouseEvent e ) { }
public void mousePressed( MouseEvent e ) {
mx = e.getX();
my = e.getY();
e.consume();
}
public void mouseReleased( MouseEvent e ) { }
public void mouseMoved( MouseEvent e ) { }
public void mouseDragged( MouseEvent e ) {
// get the latest mouse position
int new_mx = e.getX();
int new_my = e.getY();
// adjust angles according to the distance travelled by the mouse
// since the last event
azimuth -= new_mx - mx;
elevation += new_my - my;
// update the backbuffer
drawWireframe( backg );
// update our data
mx = new_mx;
my = new_my;
repaint();
e.consume();
}
   
    @Override
public void update( Graphics g ) {
g.drawImage( backbuffer, 50, 50, this );
showStatus("Elev: "+elevation+" deg, Azim: "+azimuth+" deg");
}

    @Override
public void paint( Graphics g ) {
update( g );
}

public void paint1(Graphics g)
{
    if (radio1.getState()) g.setColor(Color.red);
    else if (radio2.getState()) g.setColor(Color.blue);
    else g.setColor(Color.green);
    if (shape1.getState()) g.drawRect(70,70 , 80, 100);
    else if (shape2.getState()) g.drawOval(70, 70, 100, 100);
    else g.drawRect(60,60,100,100);
}
public void actionPerformed(ActionEvent evt, Graphics g)
   {
       if (evt.getSource() == okButton)
      paint1(g);
   }
}

I added the paint1 and actionperformed methods to the code. Please let me know how to fix it. Thank you and take care.

you all ready changing it here :

Code:

if (radio1.getState()) g.setColor(Color.red);
    else if (radio2.getState()) g.setColor(Color.blue);
    else g.setColor(Color.green);


Hi there, thanks for your response. It should work but it is not! I dont know y I still cant change the color of the graph. Did u try it? If yes then does the color change?
Thank you again and take care.

Are you sure from the conditions like

if (radio1.getState())

because my be
else g.setColor(Color.green);

is the case always running .

Yes I am sure cause I tried the following code and it did work:

Code:


import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class Buttons extends Applet implements ActionListener
{

     Button okButton;
     //Button okButton1;
     CheckboxGroup radioGroup;
     Checkbox radio1;
     Checkbox radio2;
     Checkbox radio3;
     CheckboxGroup shapeGroup;
     Checkbox shape1;
     Checkbox shape2;
     Checkbox shape3;
     Image backbuffer;
     Graphics backg;
     public void init()
     {

          setLayout(new FlowLayout());
          okButton = new Button("Action");
        // okButton1 = new Button("Shape");
          radioGroup = new CheckboxGroup();
          radio1 = new Checkbox("Red", radioGroup,false);
          radio2 = new Checkbox("Blue", radioGroup,true);
          radio3 = new Checkbox("Green", radioGroup,false);
          shapeGroup = new CheckboxGroup();
          shape1 = new Checkbox("Rectangle", shapeGroup,false);
          shape2 = new Checkbox("Circle", shapeGroup,true);
          shape3 = new Checkbox("Square", shapeGroup,false);
          add(okButton);
          //add(okButton1);
          add(shape1);
          add(shape2);
          add(shape3);
          add(radio1);
          add(radio2);
          add(radio3);
          okButton.addActionListener(this);
          //okButton1.addActionListener(this);
          }
         public void paint(Graphics g  )
         {
            if (radio1.getState()) g.setColor(Color.red);
            else if (radio2.getState()) g.setColor(Color.blue);
            else g.setColor(Color.green);


            if (shape1.getState()) g.drawRect(70,70 , 80, 100);
            else if (shape2.getState()) g.drawOval(70, 70, 100, 100);
            else g.drawRect(60,60,100,100);
         }

     public void actionPerformed(ActionEvent evt)
     {
       if (evt.getSource() == okButton)
       repaint();

      //if (evt.getSource() == okButton1)
       //repaint();
      };
    
 }  
 

If you run it then u can see that both shapes and the colors are changing but when using the same code for the given 3d graph it did not? If you notice in this part:
public class Buttons extends Applet implements ActionListener

There is an ActionListener but in the first code I coudlnt add it to the public class WireframeViewer, if I did then i will get some error.

Thanks again