You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
121 lines
3.5 KiB
Java
121 lines
3.5 KiB
Java
Draw a pie chart
|
|
|
|
import java.util.*;
|
|
import java.awt.*;
|
|
import java.applet.Applet;
|
|
|
|
public class Graph extends Applet {
|
|
int depth, radius;
|
|
|
|
public void init() {
|
|
float value;
|
|
String at = getParameter("width");
|
|
radius = (at != null) ? Integer.valueOf(at).intValue() : 100;
|
|
at = getParameter("depth");
|
|
depth = (at != null) ? Integer.valueOf(at).intValue() : 20;
|
|
at = getParameter("values");
|
|
PieChartCanvas c = new PieChartCanvas(radius, depth);
|
|
setLayout(new BorderLayout());
|
|
|
|
// Create Hashtable to map color name (String) to Color type
|
|
Hashtable colors = new Hashtable();
|
|
colors.put("green", Color.green);
|
|
colors.put("red", Color.red);
|
|
colors.put("blue", Color.blue);
|
|
colors.put("yellow", Color.yellow);
|
|
colors.put("magenta", Color.magenta);
|
|
colors.put("cyan", Color.cyan);
|
|
colors.put("orange", Color.orange);
|
|
colors.put("pink", Color.pink);
|
|
colors.put("white", Color.white);
|
|
colors.put("black", Color.black);
|
|
|
|
// "value-color,value-color,..."
|
|
StringTokenizer t = new StringTokenizer(at, ",");
|
|
String s;
|
|
int i;
|
|
while (t.hasMoreTokens()) {
|
|
s = t.nextToken();
|
|
i = s.indexOf('-');
|
|
value = Float.valueOf(s.substring(0, i)).floatValue();
|
|
c.addSlice(value, (Color)colors.get(s.substring(i + 1)));
|
|
}
|
|
|
|
resize(c.getMinimumSize().width, c.getMinimumSize().height);
|
|
add("Center", c);
|
|
}
|
|
}
|
|
|
|
class PieChartCanvas extends Canvas {
|
|
|
|
final double aspectFudge = 2.5;
|
|
int radius, depth, called = 1, numSlices = 0;
|
|
float total = 0, value[] = new float[10];
|
|
Color color[] = new Color[10];
|
|
Graphics offGraphics;
|
|
Image gfxBuff;
|
|
|
|
public PieChartCanvas(int radius, int depth) {
|
|
this.value = value;
|
|
this.color = color;
|
|
this.radius = radius;
|
|
this.depth = depth;
|
|
}
|
|
|
|
public void paint(Graphics g) {
|
|
int startAngle;
|
|
float angle;
|
|
Dimension d = getSize();
|
|
|
|
if(gfxBuff == null) {
|
|
gfxBuff = createImage(d.width, d.height);
|
|
offGraphics = gfxBuff.getGraphics();
|
|
offGraphics.setColor(getBackground());
|
|
offGraphics.fillRect(0, 0, d.width, d.height);
|
|
}
|
|
|
|
// do the 3d effect
|
|
for(int x = depth; x >= 1; x--) {
|
|
startAngle = -45;
|
|
for(int i = 0; i < numSlices; i++) {
|
|
offGraphics.setColor(color[i].darker());
|
|
angle = Math.round(360 * (value[i] / total));
|
|
offGraphics.fillArc(0, x, radius, (int)(radius / aspectFudge),
|
|
startAngle, (int)angle);
|
|
startAngle += angle;
|
|
}
|
|
}
|
|
|
|
// draw the pie slice
|
|
startAngle = -45;
|
|
for(int i = 0; i < numSlices; i++) {
|
|
offGraphics.setColor(color[i]);
|
|
angle = Math.round(360 * (value[i] / total));
|
|
offGraphics.fillArc(0, 0, radius, (int)(radius / aspectFudge),
|
|
startAngle, (int)angle);
|
|
startAngle += angle;
|
|
}
|
|
g.drawImage(gfxBuff, 0, 0, null);
|
|
}
|
|
|
|
public void addSlice(float value, Color color) {
|
|
this.value[numSlices] = value;
|
|
this.color[numSlices++] = color;
|
|
total += value;
|
|
}
|
|
|
|
public Dimension getPreferredSize() {
|
|
return getMinimumSize();
|
|
}
|
|
|
|
public Dimension getMinimumSize() {
|
|
return new Dimension(radius, (int)((radius / aspectFudge) + depth));
|
|
}
|
|
}
|
|
|
|
<APPLET CODE=Graph.class WIDTH=150 HEIGHT=150>
|
|
<PARAM NAME="depth" VALUE="30">
|
|
<PARAM NAME="width" VALUE="120">
|
|
<PARAM NAME="values" VALUE="1-red,2-green,3-blue">
|
|
</APPLET>
|