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BlackKilla
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Joined: 02 Jul 2006
Posts: 207
Location: North America ~Rollin up the Trees...

Posted: Sun Mar 18, 2007 11:56 pm Post subject: Help Java

Well...This is a project i have due in a few days...and I cant figure out the width and height of a polygon...any help,Hears my code

Code:

import java.applet.*;
import java.awt.*;

public class Shapes extends Applet {

private int last_x=0;
private int last_y=0;
private Color current_color=Color.black;
private Button clear_button;
private Choice color_choices;
private Choice shape_choices;
//Setting up all the buttons
public void init()
{ this.setBackground(Color.white);
clear_button=new Button("Clear");
   clear_button.setForeground(Color.black);
   clear_button.setBackground(Color.lightGray);
   this.add(clear_button);

//Setting the choices for colors
   color_choices=new Choice();
   color_choices.addItem("Black");
   color_choices.addItem("Red");
   color_choices.addItem("Yellow");
   color_choices.addItem("Green");
   color_choices.addItem("Cyan");
   color_choices.addItem("Blue");
   color_choices.addItem("Dark Gray");
   color_choices.addItem("Gray");
   color_choices.addItem("Magenta");
   color_choices.addItem("Orange");
   color_choices.addItem("Pink");
   color_choices.addItem("White");
   color_choices.setForeground(Color.black);
   color_choices.setBackground(Color.lightGray);
   this.add(new Label("Color"));
   this.add(color_choices);
//Setting the choices for shapes
   shape_choices=new Choice();
   shape_choices.addItem("Circle");
   shape_choices.addItem("Polygon");
   shape_choices.addItem("Oval");
   shape_choices.addItem("Square");
   this.add(new Label("Shape"));
   this.add(shape_choices);
}
//Doing all the indivual methods for drawing the shapes
public boolean Circle(){
   Graphics g=this.getGraphics();
   g.setColor(current_color);
   g.drawOval(100,100,50,50);
   return true;
   }
public boolean Square(){
   Graphics g=this.getGraphics();
   g.setColor(current_color);
   g.drawRect(200,200,50,50);
   return true;
   }
public boolean Polygon(){
   Graphics g=this.getGraphics();
   g.setColor(current_color);
   g.drawRect(150,150,50,50);
   return true;
   }
public boolean Oval(){
   Graphics g=this.getGraphics();
   g.setColor(current_color);
   g.drawOval(50,50,50,75);
   return true;
   }
//Letting the user draw
public boolean mouseDown(Event e,int x,int y)
{
last_x=x;
last_y=y;

System.out.println(x+","+y);

return true;
}
public boolean mouseDrag(Event e,int x,int y)
{
   Graphics g=this.getGraphics();
g.setColor(current_color);
g.drawLine(last_x,last_y,x,y);
last_x=x;
last_y=y;

return true;
}
//Setting the actions for the buttons
public boolean action(Event event,Object arg)
{
   if(event.target==clear_button){
   Graphics g=this.getGraphics();
   Rectangle r=this.bounds();
   g.setColor(this.getBackground());
   g.fillRect(r.x,r.y,r.width,r.height);
   return true;
   }
   else if(event.target==color_choices){
      if(arg.equals("Black"))current_color=Color.black;
      else if(arg.equals("Yellow"))current_color=Color.yellow;
      else if(arg.equals("Red"))current_color=Color.red;
      else if(arg.equals("Green"))current_color=Color.green;
      else if(arg.equals("Cyan"))current_color=Color.cyan;
      else if(arg.equals("Blue"))current_color=Color.blue;
      else if(arg.equals("Dark Gray"))current_color=Color.darkGray;
      else if(arg.equals("Magenta"))current_color=Color.magenta;
      else if(arg.equals("Orange"))current_color=Color.orange;
      else if(arg.equals("Pink"))current_color=Color.pink;
      else if(arg.equals("White"))current_color=Color.white;
      return true;
      }
   else if(event.target==shape_choices){
      if(arg.equals("Circle"))Circle();
      else if(arg.equals("Square"))Square();
      else if(arg.equals("Polygon"))Polygon();
      else if(arg.equals("Oval"))Oval();
      return true;
   }
   else return super.action(event,arg);
}
}

_________________

ravicus
Master Cheater

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Joined: 16 Dec 2006
Posts: 464

Posted: Mon Mar 19, 2007 8:42 am Post subject:

What grade are you in? Or what year in college? _________________

DeltaFlyer
Grandmaster Cheater

Reputation: 0

Joined: 22 Jul 2006
Posts: 666

Posted: Mon Mar 19, 2007 4:15 pm Post subject:

My school taught applets in grade 10.

Anyways, I see that you're using a drawRect for your draw polygon. Instead of using that, create a Polygon class with the points that define it. Here's the constructor:

Code:

Polygon
public Polygon(int[] xpoints,
int[] ypoints,
int npoints)Constructs and initializes a Polygon from the specified parameters.

Parameters:
xpoints - an array of x coordinates
ypoints - an array of y coordinates
npoints - the total number of points in the Polygon
Throws:
NegativeArraySizeException - if the value of npoints is negative.
IndexOutOfBoundsException - if npoints is greater than the length of xpoints or the length of ypoints.
NullPointerException - if xpoints or ypoints is null.

Next, there is a non-static method named getBounds that takes in no parameters and returns a Rectangle object. In that rectangle object, you could find the width and height from the two field variables.

Here's a brief example:

Code:

final int NUM_OF_POINTS = 10;

int[] x = new int [NUM_OF_POINTS];
int[] y = new int [NUM_OF_POINTS];

//Read in user input for array

Polygon poly = new Polygon (x, y, NUM_OF_POINTS);

Rectangle rect = poly.getBounds ();

System.out.println ("The width is: " + rect.getWidth () + "\r\n" +
"The height is: " + rect.getHeight ());

_________________

Wow.... still working at 827... what's INCA thinking?
zomg l33t hax at this place (IE only). Over 150 people have used it, what are YOU waiting for?

ravicus
Master Cheater

Reputation: 0

Joined: 16 Dec 2006
Posts: 464

Posted: Mon Mar 19, 2007 4:39 pm Post subject:

I'm in seventh grade -_- _________________

DeltaFlyer
Grandmaster Cheater

Reputation: 0

Joined: 22 Jul 2006
Posts: 666

Posted: Mon Mar 19, 2007 5:08 pm Post subject:

ravicus wrote:

I'm in seventh grade -_-

I was merely giving you an answer to the question you asked. No need for the -_- face.
_________________

Wow.... still working at 827... what's INCA thinking?
zomg l33t hax at this place (IE only). Over 150 people have used it, what are YOU waiting for?

ravicus
Master Cheater

Reputation: 0

Joined: 16 Dec 2006
Posts: 464

Posted: Mon Mar 19, 2007 7:07 pm Post subject:

-_- isn't an insult, it is just telling you why I am not very good at Java yet, I've only been at it for 2 days. _________________

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