Please Help!!!


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  1. #1
    Join Date
    Mar 2004
    Posts
    3

    Please Help!!!

    Im trying to build my first applet but im totally lost. I cant understand what ive done wrong. I want to be able to select a choice(circle,square,etc and click on a button which draws that object on my canvas but imlost.Can some1 please help. Here is my code in full...
    //import classes
    import java.awt.*;
    import java.io.*;
    import java.lang.*;
    import java.net.URL;
    import java.util.*;
    import java.awt.Color;
    import java.applet.*;

    //Java Applet of Objects
    public class Objects extends Applet
    {
    ObjectsControls controls;
    ObjectsCanvas canvas;
    int c;

    //initialise border,controls(add to Pane)
    public void init()
    {
    setLayout(new BorderLayout());
    ObjectsCanvas c = new ObjectsCanvas();
    add("Center", c);
    add("North", controls = new ObjectsControls(c));
    }

    //start controls
    public void start()
    {
    controls.start();
    }

    //stop controls
    public void stop()
    {
    controls.stop();
    }

    //initialise frame with objects
    public static void main(String args[])
    {
    Frame f = new Frame("Objects");
    Objects objects = new Objects();

    objects.init();
    objects.start();

    f.add("Center", objects);
    f.resize(550,600 );
    f.show();
    }
    }

    /********************************
    * - Applet Canvas - *
    * paint method *
    * (objects and canvas) *
    ********************************/


    class ObjectsCanvas extends Canvas
    {
    boolean submit = false;
    int noob = 0;
    int obj = 0;
    Objects objects;
    ObjectsControls controls;

    public void add(Objects object){}
    //paint method
    public void paint(Graphics g)
    {
    this.white(g);
    }


    public void update(Graphics g)
    {
    if (!submit)this.white(g);
    else
    {
    if (noob == 0)
    {
    this.oval(g,obj);
    }
    else if (noob == 1)
    {
    this.rect(g,obj);
    }
    else if (noob == 2)
    {
    this.square(g,obj);
    }
    else
    {
    this.triangle(g,obj);
    }
    }
    }

    //canvas(draw objects)
    public void white(Graphics g)
    {
    g.setColor(Color.white);
    g.fillRect(10,10,500,280);
    g.setColor(Color.black);
    g.drawRect(10,10,500,280);
    }

    //object oval
    public void oval(Graphics g,int obj)
    {
    g.setColor(Color.red);
    g.fillOval(30,30,20,20);
    }

    //object rectangle
    public void rect(Graphics g,int obj)
    {
    g.setColor(Color.blue);
    g.fillRect(50,50,400,220);
    }

    //object square
    public void square(Graphics g,int obj)
    {
    g.setColor(Color.green);
    g.fillSquare(25,25,25,25);
    }

    //object triangle
    public void triangle(Graphics g,int obj)
    {
    g.setColor(Color.yellow);
    g.fillTriangle(10,10);
    }

    public void getdata(int noob)
    {
    this.noob = noob;
    }

    public void redraw(boolean submit)
    {
    this.submit = submit;
    repaint();
    }
    }

    /********************************
    * - Applet Controls - *
    * creating controls *
    * action method *
    ********************************/

    class ObjectsControls extends Panel
    {
    int o,obj;
    ObjectsCanvas canvas;

    //add object controls
    public ObjectsControls(ObjectsCanvas canvas)
    {
    this.canvas = canvas;

    Choice o = new Choice();
    o.addItem("Circle");
    o.addItem("Rectangle");
    o.addItem("Square");
    o.addItem("Triangle");
    add(o);

    add(new Button("submit"));
    add(new Button("clear"));
    }

    //action method
    public boolean action(Event e, Object arg)
    {
    if (e.target instanceof Choice)
    {
    String label = (String)arg;

    if (label.equals("Circle"))
    o=0;
    else if (label.equals("Rectangle"))
    o=1;
    else if (label.equals("Square"))
    o=2;
    else
    o=3;

    canvas.getdata(o);
    return true;
    }
    else if(e.target instanceof Button)
    {
    String label = (String)arg;
    canvas.redraw(label.equals("submit"));
    return true;
    }
    return false;
    }

    //start actions
    public void start()
    {
    this.enable();
    }

    //stop actions
    public void stop()
    {
    this.disable();
    }
    }

  2. #2
    Join Date
    Feb 2004
    Posts
    808
    read the discussion in my signature, regarding Inherited SHapes
    The 6th edict:
    "A thing of reference thing can hold either a null thing or a thing to any thing whose thing is assignment compatible with the thing of the thing" - ArchAngel, www.dictionary.com et al.
    JAR tutorial GridBag tutorial Inherited Shapes Inheritance? String.split(); FTP?

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