import javax.microedition.lcdui.*;

class ImageCanvas extends Canvas {
    Image screenImage = null;
    Graphics screenGraphics = null;
    int screenH, screenW;

    ImageCanvas() {
        screenH = getHeight();
        screenW = getWidth();
        screenImage = Image.createImage(screenW, screenH);
        screenGraphics = screenImage.getGraphics();
    }

    protected void paint(Graphics g) {
        g.drawImage(screenImage, 0, 0, Graphics.TOP|Graphics.LEFT);
    }
}