Old School Scroll line

This is my first try to make an old school scroll line like on my old Atari ST.
Normally this is a bitmap effect, but in JavaFx all is nodes…
So I use Nodes :) and this image (from http://forum.deltaforceteam.de/forum/viewtopic.php?f=3&t=127 )

The viewports variable is a sequence which contains for each character the portion of the image corresponding to it.
The line variable is a concatenation of the viewports of the letters to build the text shown in the screen.
And the timeline is used to scroll the text

I add a Reflection effect too :)

Main.fx

package scrolllinedemo;

/*
 * Main.fx
 *
 * Created on 12 déc. 2009, 00:08:52
 */
import javafx.stage.Stage;
import javafx.scene.Scene;

import javafx.geometry.Rectangle2D;

import javafx.scene.image.ImageView;

import javafx.scene.image.Image;

import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.scene.effect.Reflection;

import javafx.scene.Group;
import javafx.scene.shape.Rectangle;
import javafx.scene.control.TextBox;
import javafx.scene.control.Button;

/**
 * @author Patrick
 */

def letterWidth = 32;
def letterHeight = 32;

var blankLine = [   0,   0,   0,   0,   0,   0,   0,  0,  0,  0 ];

var text = "Hello, this is my first old school scroll line demo. by Patrick ! ";

var textFont = StringConverter.stringToFont(text);
insert blankLine before textFont[0];
var textLength = sizeof(textFont)-1;
insert blankLine into textFont;

var textIncrement = 0;

var font = Image {
   url: "{__DIR__}img/font.png"
}

def viewports = for (row in [0..5]) {
   for (col in [0..9]) {
       Rectangle2D{
           minX: col * letterWidth, minY: row * letterHeight, height: letterWidth, width: letterHeight
       }
   }
}

var line = bind
   for (col in [0..10]) {   //10 chars (320 = 32*10)
      ImageView {
         x: bind (col * letterWidth) -scrollX , y:  0,
         viewport: bind viewports[textFont[col+textIncrement]]
         image: font
      }
   }

var scrollX =0;

var t = Timeline {
                repeatCount: Timeline.INDEFINITE
                keyFrames : [
                        KeyFrame {
                                time : 0s
                                canSkip : true
                        },
                        KeyFrame {

                                time : 8ms
                                canSkip : true
                                action: function(): Void{

                                  var tempX = scrollX+1;
                                  var tempTextIncrement = textIncrement;

                                   if (tempX>=32){
                                       tempX = 0;
                                     if (textIncrement<textLength)
                                        then tempTextIncrement++
                                        else tempTextIncrement = 0;

                                   }
                                   textIncrement = tempTextIncrement;
                                   scrollX = tempX;

                                }
                        }
                ]
        }

t.play();

var tb:TextBox;

Stage {
    title: "Application title"
    width: 335
    height: 150
    scene: Scene {
        content: [
                Group {
                    content:Group{
                        clip:Rectangle {
                                width:  320
                                height: 64
                            }
                        content: line
                    }
                    effect:Reflection {
                         fraction: 0.75
                         topOffset: 0.0
                         topOpacity: 0.5
                         bottomOpacity: 0.0
                    }
                  }
                
                tb = TextBox {
                        text: "try to type your text here... and press on GO!"
                        columns: 30
                        selectOnFocus: true
                        translateY:70
                }
                Button {
                        text: "GO!"
                        action: function() {
                            var textFontTemp = StringConverter.stringToFont(tb.text);
                            insert blankLine before textFontTemp[0];
                            textLength = sizeof(textFontTemp)-1;
                            insert blankLine into textFontTemp;

                            textFont = textFontTemp;
                            textIncrement =0;
                        }
                        translateY:70
                        translateX:275
                }
        ]
    }
}

download StringConverter.fx