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Message:

pie

Posted by Tom on December 16, 2001 at 7:44 AM

if you still need a pie chart applet heres one i worte also does bar chrat., doesn't use swing so it'll work in IE 5

there are not many notes so if you need ant explaining send me an e-mail

there are 3 classes you need and a Msg box class for error handling.

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

public class Main extends Applet implements ActionListener{
private Data data = new Data();
private Chart chart = new Chart(data);
private Msg msg = new Msg();
private Image toMem;//the 'type' for the off screen buffer
private Button ok ;//ok button for Msg Box
private Button clear;//reset button for charts
private Image Matt;//picy of Matt on Msg Box
private TextField value ;//text Box for input



public void init() {
setLayout(null) ;
Matt = getImage ( getDocumentBase(), "matt.jpg");
value = new TextField(10) ;
value.setBounds(360,40,70,20);
add(value) ;
value.addActionListener(this);
ok = new Button("Ok") ;
ok.setBounds(315,400,70,20);
add(ok) ;
ok.setVisible(false);
ok.addActionListener(new ActionListener (){//what happens when ok button press
public void actionPerformed(ActionEvent e) {
data.state1=false;
ok.setVisible(false);
value.setVisible(true);
clear.setVisible(true);

repaint();
}
});
clear=new Button("Clear Charts");
clear.setBounds(45,350,70,20);
add(clear);
clear.addActionListener(new ActionListener (){//whats happens when clear button press
public void actionPerformed(ActionEvent e) {
for(int i=0; i data.fruit[i]=0;
data.big=0;
}
}
});

}
public void update(Graphics g){ //written by Wayne McKenzie
//make the off screen buffer the same size as the applet
toMem = createImage(700,700);
//use the graphics object of the image object
Graphics gos = toMem.getGraphics();
//call the paint method below and draw to the
//off screen buffer(toMem) using it's graphics object(gos)
paint(gos);
//dump the contents of the off screen buffer
//to the screen
g.drawImage(toMem,0,0,null);
}

public void paint(Graphics g) {
setBackground(Color.white);

if (data.state1==false){//valid input
data.display(g) ;
chart.display(g) ;
repaint();
}
else{//invalid input
msg.display(g);
ok.setVisible(true);
value.setVisible(false);
clear.setVisible(false);
g.drawImage( Matt, 420,340,this);
repaint();
}

}

public void actionPerformed(ActionEvent event) {
String newValue = (value.getText()) ;
data.setValue(newValue) ;
data.enter();
repaint() ;

}
}

****************************************************************

import java.awt.*;

public class Data {
public int big=0;//highest number ofvalues
private int yaxis=200;// y axis of graph
private int yunit=0;// size of units for y axis
public boolean state1=false;//used for msg box when invalid input is entered

public int[] fruit = new int[6] ;//array that save everything
public String newValue ; // value to be transferred to array
private String value;//input from user

// Set the new value to update the array
public void setValue(String value) {
newValue = value;
}
public void enter (){
if (newValue.equalsIgnoreCase("APPLES")){
fruit[0]++;
}
else if (newValue.equalsIgnoreCase("PEARS")){
fruit[1]++;
}
else if (newValue.equalsIgnoreCase("PINEAPPLES")){
fruit[2]++;
}
else if (newValue.equalsIgnoreCase("BANANAS")){
fruit[3]++;
}
else if (newValue.equalsIgnoreCase("GRAPES")){
fruit[4]++;
}
else if (newValue.equalsIgnoreCase("RHUBARB")){
fruit[5]++;
}
else {
state1=true;
}
}

//find the highest value
public void high (){
for(int i=0; i if (big <=fruit[i]){
big=fruit[i];
}
}
}
//finds the sum
public double addValue() {
double sum = 0;
for(int i=0 ; i sum = sum + (double)(fruit[i]);

}
return sum ;

}



//units to be used when drawing the chart
public int unit(){
try{
yunit=(yaxis / big);
}
catch(ArithmeticException e){}
return yunit;
}

public void display(Graphics g) {
Font font = new Font("ComicSansMs",Font.BOLD,14);
g.setFont(font);
g.drawString("Enter You Favourite fruit from the list below",45,55);
g.drawString("APPLES = "+fruit[0],45,90);
g.drawString("PEARS = "+fruit[1],45,110);
g.drawString("PINEAPPLES = "+fruit[2],45,130);
g.drawString("BANANAS = "+fruit[3],45,150);
g.drawString("GRAPES = "+fruit[4],45,170);
g.drawString("RHUBARB = "+fruit[5],45,190);
}
}

****************************************************************

import java.awt.*;

public class Chart {
private Data data;

public Chart(Data indata){
data = indata;
}


public void display(Graphics g) {
data.high();
data.addValue();
g.setColor(Color.black);
g.fillRect(275,77,3,206); //y axis
g.fillRect(270,275,305,3); //x axis
//x axis dividers
g.fillRect(325,275,3,8);
g.fillRect(375,275,3,8);
g.fillRect(425,275,3,8);
g.fillRect(475,275,3,8);
g.fillRect(525,275,3,8);
g.fillRect(575,275,3,8);
//x axis lables
Font font = new Font("ComicSansMs",Font.BOLD,8);
g.setFont(font);
g.drawString("APPLES",280,290);
g.drawString("PEARS",330,290);
g.drawString("PINE-",380,290);
g.drawString("APPLES",380,298);
g.drawString("BANANAS",430,290);
g.drawString("GRAPES",480,290);
g.drawString("RHUBARB",530,290);
//y axis dividers
for(int i=0; i g.fillRect(270,275-(data.unit()*i),5,3);
//y axis lables
Font font1 = new Font("ComicSansMs",Font.BOLD,10);
g.setFont(font1);
g.drawString(""+data.big,260,77);
g.drawString(""+i,260,275-(data.unit()*i));

}
//Both charts
double percent;
int slice=0;
double angle =3.6;
try{
percent = 100/data.addValue()* angle;
slice=((int)(percent));
}
catch(ArithmeticException e){}
//graph * 2 for apples
g.setColor(Color.red);
g.fillRect((278),275-(data.unit()*data.fruit[0]),47,(data.unit()*data.fruit[0]));
g.fillArc(200,350,300,300,90,-(data.fruit[0]*slice));
//pears
g.setColor(Color.yellow);
g.fillRect((328),275-(data.unit()*data.fruit[1]),47,(data.unit()*data.fruit[1]));
g.fillArc(200,350,300,300,(90-(data.fruit[0]*slice)),-(data.fruit[1]*slice));
//Pineapples
g.setColor(Color.green);
g.fillRect((378),275-(data.unit()*data.fruit[2]),47,(data.unit()*data.fruit[2]));
g.fillArc(200,350,300,300,(90-(data.fruit[0]*slice)-(data.fruit[1]*slice)),-(data.fruit[2]*slice));
//bananas
g.setColor(Color.cyan);
g.fillRect((428),275-(data.unit()*data.fruit[3]),47,(data.unit()*data.fruit[3]));
g.fillArc(200,350,300,300,(90-(data.fruit[0]*slice)-(data.fruit[1]*slice)-(data.fruit[2]*slice)),-(data.fruit[3]*slice));
//grapes
g.setColor(Color.blue);
g.fillRect((478),275-(data.unit()*data.fruit[4]),47,(data.unit()*data.fruit[4]));
g.fillArc(200,350,300,300,(90-(data.fruit[0]*slice)-(data.fruit[1]*slice)-(data.fruit[2]*slice)-(data.fruit[3]*slice)),
-(data.fruit[4]*slice));
//rhubarb
g.setColor(Color.magenta);
g.fillRect((528),275-(data.unit()*data.fruit[5]),47,(data.unit()*data.fruit[5]));
g.fillArc(200,350,300,300,(90-(data.fruit[0]*slice)-(data.fruit[1]*slice)-(data.fruit[2]*slice)-(data.fruit[3]*slice)
-(data.fruit[4]*slice)),-(data.fruit[5]*slice));
}
}

*****************************************************************

import java.awt.*;

public class Msg {

public void display(Graphics g){
g.setColor(Color.gray);
g.fillRect(198,298,354,154);
g.setColor(Color.lightGray);
g.fillRect(200,300,350,150);
g.setColor(Color.blue);
g.fillRect(205,305,340,25);
g.setColor(Color.black);
Font font = new Font("ComicSansMs",Font.PLAIN,14);
g.setFont(font);
g.drawString("ERROR",210,325);
g.drawString("That is not a valid entry! ",215,350);
}
}

****************************************************************

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you'll need a picture in the classes for the Msg box

good luck!