[mshouab]

i want to put a pointer on the canvas which is used for getting the x,y coordinates so that i can paste the image on the required coordinates this pointer should be handled through arrow keys how is it possible in canvas.the pinter can be of any shape.

Regards,
Muhammad Shouab.

[peterblazejewicz]

hi Muhammad,

pointer can be drawn or can be custom png-based image, so it really could be anything,

here is basic, rudimentary, not optimized sample:

package tests;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class GameKeysTest extends MIDlet implements CommandListener {
    public void startApp() {
        Displayable current = Display.getDisplay(this).getCurrent();
        if(current == null){
            current = new MyCanvas();
            current.addCommand(new Command("Quit", Command.EXIT, 1));
            current.setCommandListener(this);
        }
        Display.getDisplay(this).setCurrent(current);
    }
    
    public void pauseApp() { 
    }
    
    public void destroyApp(boolean unconditional) {
    }
    
    public void commandAction(Command command, Displayable displayable) {
        if(command.getCommandType() == Command.EXIT){
            Display.getDisplay(this).setCurrent(null);
            notifyDestroyed();
        }
    }

    class MyCanvas extends Canvas {
        int w;
        int h;
        Point pointer;
        public MyCanvas(){
            setTitle("EXAMPLE");
            setFullScreenMode(true);
            w = getWidth();
            h = getHeight();
            pointer = new Point(w/2, h/2);
        }
        protected  void keyPressed(int keyCode) {
            int gameKey = getGameAction(keyCode);
            int x = pointer.getX();
            int y = pointer.getY();
            switch(gameKey){
                case UP:
                    if(y>0){
                        pointer.setY(--y);
                        repaint();
                    }
                    break;
                case DOWN:
                    if(y<w){
                        pointer.setY(++y);
                        repaint();
                    }
                    break;
                case LEFT:
                    if(x>0){
                        pointer.setX(--x);
                        repaint();
                    }
                    break;
                case RIGHT:
                    if(x<w){
                        pointer.setX(++x);
                        repaint();
                    }
                    break;
                default:
                    // break through //
            }
        }
        protected  void keyRepeated(int keyCode) {
            keyReleased(keyCode);
        }
        protected void sizeChanged(int aWidth, int aHeight) {
            w = aWidth;
            h = aHeight;
            repaint();
        }
        protected void paint(Graphics g) {
            int x = pointer.getX();
            int y = pointer.getY();
            g.setColor(0xFFFFFFFF);
            g.fillRect(0, 0, w, h);
            g.setColor(0x00000000);
            g.drawLine(x-3, y, x-1, y);
            g.drawLine(x+1, y, x+3, y);
            g.drawLine(x, y-3, x, y-1);
            g.drawLine(x, y+1, x, y+3);           
        }
        
    }
    
    class Point{
        int x;
        int y;
        public Point(){
            x = 0;
            y = 0;
        }
        public Point(int x, int y){
            this.x = x;
            this.y = y;
        }
        public int getX(){
            return x;
        }
        public void setX(int value){
            x = value;
        }
        public int getY(){
            return y;
        }
        public void setY(int value){
            y = value;
        }
    }
}

hth,
regards,
Peter