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);
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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();
}
}
}
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