|
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Graphics;
import javax.microedition.midlet.MIDlet;
public class PieChartMIDlet extends MIDlet implements CommandListener {
private Command exitCommand;
public void startApp() {
Display display = Display.getDisplay(this);
int[] data = { 10, 20, 30, 40, 20 };
Displayable d = new PieChartCanvas(data);
exitCommand = new Command("exit", Command.EXIT, 1);
d.addCommand(exitCommand);
d.setCommandListener(this);
display.setCurrent(d);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
notifyDestroyed();
}
}
class PieChartCanvas extends Canvas {
int[] data;
int colors[] = { 0xFF0000, 0xA9E969, 0x00FFFF, 0xC675EC, 0x008800, 0x00C400 };
public PieChartCanvas(int[] data) {
this.data = data;
}
public void paint(Graphics g) {
int width = this.getWidth();
int height = this.getHeight();
g.setColor(255, 255, 255);
g.fillRect(0, 0, width, height);
int sum = 0;
for (int i = 0; i < data.length; i++) {
sum += data[i];
}
int deltaAngle = 360 * 100 / sum / 100;
int x = 4;
int y = 4;
int diameter;
if (width > height)
diameter = height - y * 2;
else
diameter = width - x * 2;
int startAngle = 0;
for (int i = 0; i < data.length; i++) {
g.setColor(colors[i]);
g.fillArc(x, y, diameter, diameter, startAngle, deltaAngle * data[i]);
startAngle += deltaAngle * data[i];
}
}
}
|
