The given example is going to draw an arc using canvas class of J2ME. You can also set a color for it, as we did in our example.

Draw arc in J2ME

     

The given example is going to draw an arc using canvas class of J2ME. You can also set a color for it, as we did in our example.

Different methods that are used in this example...

g.setColor(0, 0, 255); g.fillRect(0, 0, getWidth(), getHeight()); g.setColor(255, 0, 0); g.fillArc(15,15, 200, 200, 90, degree); display.callSerially(this); g.setColor(255, 0, 0); g.drawArc(15, 15, 200, 200, 0, 360);

In this example, circle will start moving every time the MIDlet will be started and the repaint() method will be called .

The application will look like as follow..

 

Source Code of RunningCircle.java

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class RunningCircle extends MIDlet{
  
  public void startApp(){
  Display display = Display.getDisplay (this);
  display.setCurrent(new CircleCanvas(display, 10)); 
  }

  public void pauseApp(){}

  public void destroyApp(boolean unconditional){}
}

class CircleCanvas extends Canvas implements Runnable{
  int degree = 360;
  long startTime;
  int seconds;
  Display display;

  CircleCanvas(Display display, int seconds){
  this.display = display;
  this.seconds = seconds;
  startTime = System.currentTimeMillis();
  }

  public void paint(Graphics g){
  g.setColor(0, 0, 255);
  g.fillRect(0, 0, getWidth(), getHeight());

  g.setColor(255, 0, 0);
  g.fillArc(15,15, 200, 200, 90, degree);
  display.callSerially(this);
  g.setColor(255, 0, 0);
  g.drawArc(15, 15, 200, 200, 0, 360);
  }

  public void run(){
  int i = 0;
  int milisecond = (int)((System.currentTimeMillis() - startTime)/seconds); 
  degree = 360 - (milisecond * 360)/7200;
  for(i = 0; i <= milisecond; i++){
  repaint();
  }
  }
}

Download Source Code

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