CS1 Standard Demo Page

/*
 * Program to paint a rectangle, centered in the canvas, made up of randomly 
 * colored, black framed squares.
 */
package npw;

import java.awt.Color;
import java.util.Random;
import java.util.Scanner;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;
import painter.SPainter;
import shapes.SSquare;

/**
 *
 * @author dmaslows
 */
public class Number1 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new Number1();
            }
        });
    }

    
public Number1() {
    paintTheImage();
}

private void paintTheImage() {
    int nrofrows = getNumber("rows");
    int nrofcolumns = getNumber("columns");
    int sizeofsquare = getNumber("square side length");
    int height = nrofrows * sizeofsquare;
    int width = nrofcolumns * sizeofsquare;
    SPainter miro = new SPainter("Number 1",width+50,height+50);
    miro.setBrushWidth(4);
    SSquare square = new SSquare(sizeofsquare);
    paintRectangle(miro,square,nrofrows,nrofcolumns);
}

private static int getNumber(String prompt) {
    String nss = JOptionPane.showInputDialog(null,prompt+"?");
    Scanner scanner = new Scanner(nss);
    return scanner.nextInt();
}

private static void paintRectangle(SPainter miro, SSquare square, int nrofrows, int nrofcolumns) {
    miro.mlt(((nrofcolumns-1)/2.0)* square.side());
    miro.mbk(((nrofrows-1)/2.0)* square.side());
    int i = 1;
    while ( i <= nrofrows) {
        paintOneRow(miro,nrofcolumns,square);
        miro.mfd(square.side());
        i = i+1;
    }
    miro.mrt(((nrofcolumns-1)/2.0) * square.side());
    miro.mfd(((nrofrows-1)/2.0) * square.side());
}

private static void paintOneRow(SPainter miro, int nrofcolumns, SSquare square){
    int i = 1;
    while ( i <= nrofcolumns) {
        paintOneSquare(miro,square);
        miro.mrt(square.side());
        i = i+1;
    }
    miro.mlt(nrofcolumns*square.side());
}

private static void paintOneSquare(SPainter miro, SSquare square) {
    miro.setColor(randomColor());
    miro.paint(square);
    miro.setColor(Color.BLACK);
    miro.draw(square);
    
}

private static Color randomColor() {
    Random rgen = new Random();
    int r = rgen.nextInt(256);
    int g = rgen.nextInt(256);
    int b = rgen.nextInt(256);  
    return new Color(r,b,g);
}
}