How to use freely resizable font in in Java ME(3)

        g.setColor(255, 255,255);
        g.fillRect(0, 0, width, height);
        g.setColor(0, 0, 0);
        font = DirectUtils.getFont(face, style, fontHeight);
        fontHeight = font.getHeight();
        g.setFont(font);
        g.drawString(heightString, 0, 0, Graphics.TOP|Graphics.LEFT);
        g.drawString(fontString, 0, fontHeight, Graphics.TOP|Graphics.LEFT);
        g.drawString("com.nokia.mid.ui.version: " + System.getProperty("com.nokia.mid.ui.version"),
                0, fontHeight*2, Graphics.TOP|Graphics.LEFT); // Should return "1.2"
        edge = plusButton.drawButton(g, 10, height-70, plusButton.selected);
        edge = minusButton.drawButton(g, edge+10, height-70, minusButton.selected);
        edge = styleButton.drawButton(g, edge+10, height-70, styleButton.selected);
        if (!init) {
            plusButton.registerFeedbackArea(this, 0);
            minusButton.registerFeedbackArea(this, 1);
            styleButton.registerFeedbackArea(this, 2);
            init = true; // initialization done
        }
    }
 
    protected  void keyPressed(int keyCode) {
        if (keyCode == -2 || keyCode == -3) {
            if (fontHeight > 0) fontHeight--;
        }
        else if (keyCode == -1 || keyCode == -4) fontHeight++;
        repaint(0, 0, width, fontHeight*3+2);
    }
 
    protected  void keyReleased(int keyCode) { }
 
    protected  void keyRepeated(int keyCode) {
        if (keyCode == -2 || keyCode == -3) {
            if (fontHeight > 0) fontHeight--;
        }
        else if (keyCode == -1 || keyCode == -4) fontHeight++;
        repaint(0, 0, width, fontHeight*3+2);