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Pointer Example
This type of example is basically used in touch screen technology, here we
are trying to create a pointer which location is based on the screen touch
pointer. The source code for this small example of touch screen
application.
public void pressPointer (int x, int y) {
action = "Pointer Pressed";
this.x = x;
this.y = y;
repaint ();
}
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is used to initialize the pointer location when pressed. The source code
public void releasePointer (int x, int y) {
action = "Pointer Released";
this.x = x;
this.y = y;
repaint ();
}
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is used to released the pointer from his location. And the source code
public void dragPointer (int x, int y) {
action = "Pointer Repeated";
this.x = x;
this.y = y;
repaint ();
}
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is used when repeating the pointer, then it relocate the location of the
pointer. The Application is as follows:
Source Code of PointerExample.java
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class PointerExample extends MIDlet{
private Display display;
public void startApp(){
display = Display.getDisplay(this);
display.setCurrent (new PointerCanvas());
}
public void pauseApp(){}
public void destroyApp (boolean forced){}
}
class PointerCanvas extends Canvas {
String action = "Press Pointer!";
int x;
int y;
public void pressPointer (int x, int y) {
action = "Pointer Pressed";
this.x = x;
this.y = y;
repaint ();
}
public void releasePointer (int x, int y) {
action = "Pointer Released";
this.x = x;
this.y = y;
repaint ();
}
public void dragPointer (int x, int y) {
action = "Pointer Repeated";
this.x = x;
this.y = y;
repaint ();
}
public void paint (Graphics g) {
g.setGrayScale (255);
g.fillRect (0, 0, getWidth(), getHeight());
g.setGrayScale (0);
g.drawString (action + " " + x + "/" + y, 0, 0,
Graphics.TOP|Graphics.LEFT);
g.drawLine (x-4, y, x+4, y);
g.drawLine (x, y-4, x, y+4);
}
}
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