Write a java applet that allows the user to draw his/her data in the form of a c

Question

Write a java applet that allows the user to draw his/her data in the form of a chart. First, the user is prompted to enter his/her data (maximum of 64 integer values) and then he/she will be asked to choose the type of chart to draw (bar chart or line chart). The program will then execute the user's request. Additional Requirements 1. The chart should always occupy an area of (height 300 and width- 400) 2. The chart title should be displayed on top of the chart. 3. The bars in the bar chart should be displayed in different colors (e.g. randomly generated). The actual data should be displayed on top of each bar.(See Fig. 1) 4. The line chart should be displayed in a single color (e.g. red). The actual data and a character indicating the actual position of each point should be displayed on top of the point. Besides, the two axes showing the limits of the area occupied by the chart, should be displayed in different color (e.g. black). (See Fig.2) Note: Perform all the calculations in init0. Paint0 should be used only for drawing.

Explanation / Answer

java program :

import java.applet.Applet;
import java.applet.AppletContext;
import java.awt.*;
import java.io.PrintStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.StringTokenizer;
import java.util.Vector;

public class BhuBanner extends Applet
implements Runnable {

Thread A;
int B;
int C;
int D;
int E;
int F;
int G;
int H;
int I;
int J;
int K;
int L;
int M;
int N;
int O;
int P;
int Q;
int R;
int S;
int T;
int U;
Font V;
String W;
String X;
String Y;
String Z;
FontMetrics a;
Color b;
Color c;
Color d;
Image e;
Graphics f;
char g[];
Vector h;
Vector i;
Vector j;
int k;
int l;
int m;
int n;
int o;
int p;
int q;
boolean r;
final int s = 0;
final int t = 1;
int u;
int v[];

public void init() {
B = 0;
h = new Vector(10, 10);
i = new Vector(10, 10);
j = new Vector(10, 10);
B();
W = (String)h.elementAt(0);
setBackground(b);
E = size().width;
F = size().height;
v = new int[Q];
V = new Font(Y, S, I);
a = getFontMetrics(V);
J = a.getHeight();
H = a.stringWidth(W);
G = (F - a.getHeight()) / 2 + a.getAscent();
e = createImage(E, F);
f = e.getGraphics();
f.setFont(V);
g = W.toCharArray();
L = g.length;
K = (E - H) / 2;
P = K;
k = b.getRed();
l = b.getGreen();
m = b.getBlue();
d = c;
n = c.getRed();
p = c.getGreen();
o = c.getBlue();
for(int i1 = 0; i1 < Q; i1++) {
String s1 = (String)j.elementAt(i1);
if(s1.equalsIgnoreCase("DROP"))
v[i1] = 1;
else
if(s1.equalsIgnoreCase("SCROLL"))
v[i1] = 0;
else
v[i1] = 0;
}

u = v[0];
}

public void B() {
W = getParameter("TextToDisplay");
if(W == null)
W = "String not defined;";
Q = D(W, h);
W = getParameter("URLtoDisplay");
if(W == null)
W = "";
D(W, i);
W = getParameter("Effect");
if(W == null)
W = "DROP;SCROLL;DROP";
D(W, j);
X = getParameter("FontSize");
if(X == null)
I = 24;
else
I = Integer.parseInt(X);
Y = getParameter("FontName");
if(Y == null)
Y = "TimesRoman";
String s1 = getParameter("FontStyle");
if(s1 == null)
S = 1;
else
if(s1.equalsIgnoreCase("PLAIN"))
S = 0;
else
if(s1.equalsIgnoreCase("BOLD"))
S = 1;
else
if(s1.equalsIgnoreCase("ITALIC"))
S = 2;
else
if(s1.equalsIgnoreCase("BOLDandITALIC"))
S = 3;
else
S = 1;
Z = getParameter("target");
if(Z == null)
Z = "_blank";
String s2 = getParameter("speed");
if(s2 == null)
O = 5;
else
O = Integer.parseInt(s2);
String s3 = getParameter("xStep");
if(s3 == null)
T = 20;
else
T = Integer.parseInt(s3);
String s4 = getParameter("yStep");
if(s4 == null)
U = 10;
else
U = Integer.parseInt(s4);
String s5 = getParameter("Delay");
if(s5 == null)
R = 3000;
else
R = Integer.parseInt(s5);
String s6 = getParameter("bgCOLOR");
if(s6 == null)
b = Color.white;
else
if((b = C(s6)) == null)
b = Color.white;
String s7 = getParameter("textCOLOR");
if(s7 == null)
c = Color.black;
else
if((c = C(s7)) == null)
c = Color.black;
String s8 = getParameter("Author");
if(s8 == null || !s8.equals("www")) {
c = Color.black;
b = Color.black;
}
String s9 = getParameter("Email");
if(s9 == null || !s9.equals("x@xxx")) {
c = Color.black;
b = Color.black;
}
}

public int D(String s1, Vector vector) {
StringTokenizer stringtokenizer = new StringTokenizer(s1, ";", false);
int i1;
for(i1 = 0; stringtokenizer.hasMoreTokens(); i1++) {
String s2 = stringtokenizer.nextToken().trim();
vector.addElement(s2);
}

return i1;
}

public Color C(String s1) {
int i1;
int j1;
int k1;
try {
i1 = Integer.parseInt(s1.substring(0, s1.indexOf(",")).trim());
j1 = Integer.parseInt(s1.substring(s1.indexOf(",") + 1, s1.lastIndexOf(",")).trim());
k1 = Integer.parseInt(s1.substring(s1.lastIndexOf(",") + 1).trim());
}
catch(NumberFormatException numberformatexception) {
System.out.println("can't convert to integer, Switching to default colors" + numberformatexception);
return null;
}
try {
return new Color(i1, j1, k1);
}
catch(IllegalArgumentException illegalargumentexception) {
System.out.println("can't create new color, Switching to default colors" + illegalargumentexception);
}
return null;
}

public void start() {
if(A == null) {
A = new Thread(this);
A.start();
}
}

public void stop() {
if(A != null) {
A.stop();
A = null;
}
}

public void destroy() {
f.dispose();
}
public void run() {
do {
d = c;
r = true;
switch(u) {
default:
break;

case 1: // '
'
M = 0;
for(N = 0; M < L; N++) {
if(g[N] == ' ') {
M++;
N++;
}
P = K + a.charsWidth(g, 0, M);
D = -J;
C = P;
for(; G - D > U; D += U) {
repaint();
try {
Thread.sleep(O);
}
catch(InterruptedException interruptedexception) { }
}

D = G;
repaint();
try {
Thread.sleep(O);
}
catch(InterruptedException interruptedexception1) { }
M++;
}

for(int i1 = 0; i1 <= 100; i1 += q) {
r = false;
A(i1);
repaint();
try {
Thread.sleep(200L);
}
catch(InterruptedException interruptedexception2) { }
}

break;

case 0: // ''
M = 0;
for(N = 0; M < L; N++) {
if(g[N] == ' ') {
M++;
N++;
}
P = K + a.charsWidth(g, 0, M);
C = E;
D = G;
for(; C - P > T; C -= T) {
repaint();
try {
Thread.sleep(O);
}
catch(InterruptedException interruptedexception3) { }
}

C = P;
repaint();
try {
Thread.sleep(O);
}
catch(InterruptedException interruptedexception4) { }
M++;
}

for(int j1 = 0; j1 <= 100; j1 += q) {
r = false;
A(j1);
repaint();
try {
Thread.sleep(200L);
}
catch(InterruptedException interruptedexception5) { }
}

break;
}
B++;
if(B > Q - 1)
B = 0;
W = (String)h.elementAt(B);
H = a.stringWidth(W);
g = W.toCharArray();
L = g.length;
K = (E - H) / 2;
u = v[B];
} while(true);
}

public void A(int i1) {
int j1 = ((k - n) * i1) / 100 + n;
int k1 = ((l - p) * i1) / 100 + p;
int l1 = ((m - o) * i1) / 100 + o;
d = new Color(j1, k1, l1);
}

public void paint(Graphics g1) {
f.setColor(b);
f.fillRect(0, 0, E, F);
f.setColor(d);
if(r) {
f.drawChars(g, 0, M, K, G);
f.drawChars(g, N, 1, C, D);
} else {
f.drawString(W, K, G);
}
g1.drawImage(e, 0, 0, this);
}

public void update(Graphics g1) {
paint(g1);
}

public boolean mouseDown(Event event, int i1, int j1) {
try {
getAppletContext().showDocument(new URL((String)i.elementAt(B)), Z);
}
catch(MalformedURLException malformedurlexception) {
System.out.println("Wrong URL");
}
return true;
}

public BhuBanner() {
q = 5;
r = true;
}
}

import java.applet.*;
2 import java.awt.*;
3 import java.awt.event.*;
4
5 public class BalloonApplet extends Applet implements ActionListener {
6
7 private Button grow, shrink, left, right;
8 private Balloon theBalloon;
9
10 public void init() {
11 grow = new Button("Grow");
12 add(grow);
13 grow.addActionListener(this);
14
15 shrink = new Button("Shrink");
16 add(shrink);
17 shrink.addActionListener(this);
18
19 left = new Button("Left");
20 add(left);
21 left.addActionListener(this);
22
23 right = new Button("Right");
24 add(right);
25 right.addActionListener(this);
26
27 theBalloon = new Balloon();
28 }
29
30 public void actionPerformed(ActionEvent event) {
31 if (event.getSource() == grow)
32 theBalloon.grow();
33 if (event.getSource() == shrink)
34 theBalloon.shrink();
35 if (event.getSource() == left)
36 theBalloon.moveLeft();
37 if (event.getSource() == right)
38 theBalloon.moveRight();
39 repaint();
40 }
41
42 public void paint(Graphics g) {
43 theBalloon.display(g);
44 }
45 }
Balloon.java file used by both of the above programs:
1 import java.awt.*;
2
3 public class Balloon {
4
5 private int diameter;
6 private int x, y;
7
8 public Balloon() {
9 diameter = 10;
10 x = 20;
11 y = 50;
12 }
13
14 public void display(Graphics g) {
15 g.drawOval(x, y, diameter, diameter);
16 }
17
18 public void moveLeft() {
19 x -= 10;
20 }
21
22 public void moveRight() {
23 x += 10;
24 }
25
26 public void grow() {
27 diameter += 5;
28 }
29
30 public void shrink() {
31 diameter -= 5;
32 }
33 }

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