Hi,
I am having a problem in using radio checkbox to change the color of a graph. The main Idea was to add checkboxes to a graph and also add different shapes to the graph code which was given. The code I tried is the following :
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);
}
}It shows the checkboxes but the colors doesnt change. I never used java before and im learning by examples so I came up with the last two void methods from another example. Thanks in advance