Canvas size : Canvas « J2ME « Java Tutorial

1. Java Tutorial
2. J2ME
3. Canvas

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 CanvasSizeMIDlet extends MIDlet implements CommandListener {

  private Command exitCommand;

  Display display;

  public void startApp() {

    display = Display.getDisplay(this);
    exitCommand = new Command("Exit", Command.EXIT, 1);
    Displayable SizeCanvas = new SizeCanvas();

    SizeCanvas.addCommand(exitCommand);
    SizeCanvas.setCommandListener(this);
    display.setCurrent(SizeCanvas);
  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {
  }

  public void commandAction(Command c, Displayable s) {
    if (c == exitCommand) {
      destroyApp(false);
      notifyDestroyed();
    }
  }

}

class SizeCanvas extends Canvas {
  int width = 0;

  int height = 0;

  public void paint(Graphics g) {
    width = getWidth();
    height = getHeight();

    g.setGrayScale(255);
    g.fillRect(0, 0, width - 1, height - 1);
    g.setGrayScale(0);
    g.drawString("Stroke Style:" + g.getStrokeStyle(), 0, 60, Graphics.TOP | Graphics.LEFT);
    g.drawRect(0, 0, width - 1, height - 1);
    g.setStrokeStyle(Graphics.DOTTED);
    g.drawLine(00, 40, 60, 60);

    g.drawString(Integer.toBinaryString(width), 0, 0, Graphics.TOP | Graphics.LEFT);
    g.drawString(Integer.toBinaryString(height), 10, 20, Graphics.TOP | Graphics.LEFT);
  }

}

31.24.Canvas
	31.24.1.	extends Canvas to create your own drawable area
	31.24.2.	Get Canvas properties
	31.24.3.	Canvas key pressed and key typed events
	31.24.4.	Use Canvas to draw a clock
	31.24.5.	Canvas size
	31.24.6.	Navigatable Canvas
	31.24.7.	Canvas key event and navigate through arrow keys