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James Gralton · Guest

I have the following code in the appropiate classes in order to display a
Pie Chart. However when the chart should be displayed the window opens but
the chart isn't displayed. There and no exceptions thrown though.

Can anyone help me here please. Maybe I am missing something obvious.

private void jbInit() throws Exception {

this.setTitle("Matching Statistics");

setResizable(true);

statBoxPanel.setLayout(borderLayout1);

/////

Color bgcolor = Color.white;

PieItem[] itemArray = new PieItem[4]; // allocate storage

itemArray[0] = new PieItem(this.totalNew, "New", Color.red); // parse
argument

itemArray[1] = new PieItem(this.totalMatch, "Full Match", Color.blue);
// parse argument

itemArray[2] = new PieItem(this.totalStrongMatch, "Strong Match",
Color.green); // parse argument

itemArray[3] = new PieItem(this.totalWeakMatch, "Weak Match",
Color.yellow); // parse argument

int h = this.size().height;

int w = this.size().width;

the_pie = new PieView(h-50, itemArray, bgcolor); // shd be min(h-50, w)?

this.getContentPane().setLayout(new BorderLayout(0, 0));

this.setBackground(Color.white);

this.getContentPane().add("Center", the_pie);

tvClassLogo = new ImageIcon(GUI.class.getResource("TVClass400.jpg"));

}

package gui;

import java.awt.*;

import java.applet.*;

import java.util.*;

import java.lang.Math;

//The view of the pie.

public class PieView extends Canvas {

PieItem[] wedges; // The data for the pie

double total = 0.0; // Total of all
wedges

Color wedgeColor[] = new Color[7];

Color textColor = Color.black;

Color otherColor = Color.gray;

Color shadowColor = Color.lightGray;

Color bgColor = Color.white;

int pieViewSize; // size of square to incise pie into

static final int pieBorderWidth = 10; // pixels from circle edge to side

int pieDiameter; // derived from the view size

int pieRadius; // ..

int pieCenterPos; // ..

int minLabeledWedge = 3; // Min size of a wedge for labeling,
degrees.

int shadowOffset = 3; // offset of shadow in pixels

public PieView(int asize, PieItem[] avec, Color bc) { // constructor

this.pieViewSize = asize; // copy args

this.wedges = avec;

this.bgColor = bc;

pieDiameter = pieViewSize - 2*pieBorderWidth;

pieRadius = pieDiameter/2;

pieCenterPos = pieBorderWidth + pieRadius;

this.setFont(new Font("Helvetica", Font.BOLD, 12));

this.setBackground(bgColor);

//this.setBackground(new Color(255, 255, 183));

for (int i = 0; i < wedges.length; i++) {

total += wedges[i].frac;

}

wedgeColor[0] = Color.green; // colors that black looks good
on

wedgeColor[1] = Color.yellow;

wedgeColor[2] = Color.red;

wedgeColor[3] = Color.orange;

wedgeColor[4] = Color.cyan;

wedgeColor[5] = Color.pink;

wedgeColor[6] = Color.magenta;

} // constructor

public void paint(Graphics g) {

int startDeg = 0;

int arcDeg;

int arcDegCount = 0;

int x, y;

double angleRad;

g.setColor(shadowColor); // shadow, down and to the right 3
pixels

g.fillOval(pieBorderWidth+shadowOffset,
pieBorderWidth+shadowOffset, pieDiameter, pieDiameter);

g.setColor(otherColor); // "other" is gray

g.fillOval(pieBorderWidth, pieBorderWidth, pieDiameter,
pieDiameter);

int wci = 0;

int i;

for (i = 0; i
arcDeg = (int)Math.round(((this.wedges[i].frac / total)
* 360));

arcDegCount += arcDeg;

if ((i+1)==this.wedges.length & arcDegCount != 360) {

arcDeg += (360 - arcDegCount); // Avoid a
gray wedge due to roundoff.

}

if (this.wedges[i].color != null) {

g.setColor(this.wedges[i].color);

} else {

g.setColor(wedgeColor[wci++]);

}

g.fillArc(pieBorderWidth, pieBorderWidth, pieDiameter,
pieDiameter, startDeg, arcDeg);

if (wci >= wedgeColor.length) {

wci = 1; // Rotate colors. Don't reuse 0 in
case first and last are same.

}

startDeg += arcDeg;

} // draw wedges

startDeg = 0; // Do labels so they go on top of the wedges.

for (i = 0; i<this.wedges.length; i++) {

arcDeg = (int)Math.round(((this.wedges[i].frac / total)
* 360));

if (arcDeg > minLabeledWedge) { // Don't label small
wedges.

g.setColor(textColor);

angleRad = (float) (startDeg+
(arcDeg/2))*java.lang.Math.PI / 180.0;

x = pieCenterPos +
(int)((pieRadius/1.3)*java.lang.Math.cos(angleRad));

y = pieCenterPos -
(int)((pieRadius/1.3)*java.lang.Math.sin(angleRad))

+ 5; // 5 is about half the height of
the text

g.drawString(this.wedges[i].label, x, y);

} // don't label small wedges

startDeg += arcDeg;

} // for

} // paint()

public Dimension preferredSize () {

return new Dimension (pieViewSize, pieViewSize);

} // preferredSize

} // PieView

package gui;

import java.awt.*;

import java.applet.*;

import java.util.*;

import java.lang.Math;

// ================================================================

// A struct class to hold data for one wedge

public class PieItem {

public double frac; // each one has a
number

public String label; // and a label

public Color color; // and an optional
color

public PieItem (double d, String s, Color c) { // constructor

frac = d;

label = s;

color = c;

} // constructor

} // PieItem