!636
!629 // standard functions
!658 // image classes

import java.awt.*;
import java.awt.image.*;
import java.util.List;

public class main {
  public static void main(String[] args) {
    JFrame frame = new JFrame("A JavaX Frame");
    
    RGBImage image = new RGBImage(100, 100, Color.white);
    double splitPoint = random();
    RGB col1 = new RGB(Color.green), col2 = new RGB(Color.blue);
    vsplit(image, splitPoint, col1, col2);
    ImageSurface panel = new ImageSurface(image);
    
    frame.add(panel);
    frame.setBounds(100, 100, 500, 400);
    frame.setVisible(true);
    exitOnFrameClose(frame);
  }
  
  static Random _random = new Random();
  static double random() {
    return _random.nextInt(50001)/50000.0;
  }
  
  static void vsplit(RGBImage img, double splitPoint, RGB col1, RGB col2) {
    int w = img.getWidth(), h = img.getHeight();
    for (int yy = 0; yy < h; yy++)
      for (int xx = 0; xx < w; xx++) {
        double x = ((double) xx)/(w-1);
        double y = ((double) yy)/(h-1);
        RGB col = y <= splitPoint ? col1 : col2;
        img.setPixel(xx, yy, col);
      }
  }
}