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how to draw

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yi

Posts: 3
Nickname: ching
Registered: Aug, 2002

how to draw

Posted: Aug 5, 2002 6:22 PM

i do the programe which is about the draw line
but it doesn't work.
it just can draw one line but it doesn't continue draw next line. Also i don't know how to do the Level one

CCure.java
import java.awt.*;
import java.awt.event.*;

public class CCurve extends CloseableFrame
{
public static void main( String [ ] args )
{
Frame f = new CCurve( );

f.setLayout( new FlowLayout( ) );
f.add( new CCurveGUI( ) );

f.pack( );
f.show( );
f.setTitle("draw");
}
}
==================================================

import java.awt.*;

public class CCurveCanvas extends Canvas{
int[][] values;
String color;
int lastx, lasty;
boolean notClicked = false;
public CCurveCanvas(){
super();
}
public void setCoords(int x, int y){
if(notClicked){
lastx = x;
lasty = y;
notClicked = false;
}else{
values = new int[2][2];
values[0][0] = lastx;
values[0][1] = x;
values[1][0] = lasty;
values[1][1] = y;
lastx = x;
lasty = y;
}
}//setCoords
public void setParams(String color){
this.color = color;
repaint();
}
public void nextLevel(String colour){
makeNewValues();
setParams(colour);

}
public void paint(Graphics g){
if (values == null) {
return;
}
if(color.equals("Red")){
g.setColor(Color.red);
}else{
g.setColor(Color.blue);
}//if

int length = values[0].length;
for(int i=0;i<length-1;i++){
/*x1=value[0];
x2=value[0][i+1];
y1=value[1][j];
y2=value[1][j+1];
g.drawLine(x1,x2,y1,y2);*/
g.drawLine(values[0], values[1], values[0][i+1],values[1][i+1]);
}//for
}//paint

}//class

================================================
/**
* A class to draw specified shapes on a graphical user interface.
* The purpose of this class is to demonstrate the use of some of the GUI components form awt.
* @author Phil Sheridan
* @version 1.0 last update 19/7/1
*/

import java.awt.*;
import java.awt.event.*;

public class CCurveGUI extends Panel implements ActionListener,MouseListener
{
public CCurveCanvas theCanvas;
private TextField theLevel;
private TextField theMessage;
private Button theDrawButton;
private Button theDrawNextButton;
private Choice theColour;
private int curlevel =0;

public CCurveGUI( )
{
makeTheComponents( );
doTheLayout( );
addTheListeners();
}

// Make all the objects
private void makeTheComponents( )
{
theCanvas = new CCurveCanvas();
theCanvas.setBackground(Color.yellow);
theCanvas.setSize(500,500);
theLevel = new TextField("0",5);
theLevel.setEditable(false);
theMessage = new TextField(20);
theDrawButton = new Button("Draw");
theDrawNextButton = new Button("Draw Next");
theColour = new Choice();
theColour.add("Red");
theColour.add("Blue");
}

// Layout all the objects
private void doTheLayout( ){
setLayout(new GridLayout(1,2));
Panel left = new Panel();
Panel right = new Panel();
add(left);
add(right);
left.add(theCanvas);
right.setLayout(new FlowLayout());
right.add(theColour);
right.add(theDrawButton);
right.add(theDrawNextButton);
right.add(new Label("Level"));
right.add(theLevel);
right.add(new Label("Message"));
right.add(theMessage);
}

public void addTheListeners(){
theDrawButton.addActionListener(this);
theDrawNextButton.addActionListener(this);
theCanvas.addMouseListener(this);
}
public void actionPerformed( ActionEvent e )
{
if (e.getSource()==theDrawButton){
theCanvas.setParams(theColour.getSelectedItem());
}else{
theCanvas.nextLevel(theColour.getSelectedItem());
//increase leve counter
//theLevel.setText();
}

}
public void mouseReleased( MouseEvent e ) {}
public void mouseEntered( MouseEvent e ) {}
public void mouseClicked( MouseEvent e ) {}
public void mouseExited( MouseEvent e ) {}
public void mouseMoved( MouseEvent e ) {}

public void mousePressed(MouseEvent e){
int x = e.getX();
int y = e.getY();
theCanvas.setCoords(x,y);
}

public void makeNewValues(int x1, int y1, int x2, int y2, int level, Graphics g){
int[][] newArray = new int[2][value[0].length * 2 - 1];
for(int i=0,j=0;i<array.length;i++,j+=2){
xm= (values[0]+ values[1]+ values[0][i+1]-values[1][i+1])/2;
ym= (values[0]+ values[1]+ values[0][i+1]+values[1][i+1])/2;
/*x1=value[0];
x2=value[0][i+1];
y1=value[1][j];
y2=value[1][j+1];
xm=(x1+x2+yi-yi)/2;

newArray[0][j] =xm;
newArray[1][j+1]=ym;*/

}

}
}
}
=============================================
import java.awt.*;
import java.awt.event.*;

// Class that implements a Window that closes on a window-close event

public class CloseableFrame extends Frame implements WindowListener
{
public CloseableFrame( )
{ addWindowListener( this ); }

public void windowClosing( WindowEvent event )
{ System.exit( 0 ); }

public void windowClosed( WindowEvent event )
{ }

public void windowDeiconified( WindowEvent event )
{ }

public void windowIconified( WindowEvent event )
{ }

public void windowActivated( WindowEvent event )
{ }

public void windowDeactivated( WindowEvent event )
{ }

public void windowOpened( WindowEvent event )
{ }
}

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