1    /* 
2     * Program to paint a rectangle, centered on the canvas, made up of randomly 
3     * colored, black framed squares, with white space in between them 
4     */
5    
6    package npw;
7    
8    import painter.SPainter;
9    import shapes.SSquare;
10   
11   import javax.swing.*;
12   import java.awt.*;
13   import java.util.Random;
14   import java.util.Scanner;
15   
16   public class Number2 {
17       //the solution to the graphical problem
18       private void paintTheImage() {
19           //get the input information from the user
20           int nrOfRows = getNumber("rows");
21           int nrOfColumns = getNumber("columns");
22           int sizeOfSquare = getNumber("square side length");
23           //establish the painter
24           int height = (nrOfRows * sizeOfSquare);
25           int width = (nrOfColumns * sizeOfSquare);
26           SPainter miro = new SPainter("Number2",width + 50,height + 50);
27           miro.setBrushWidth(4);
28           SSquare square = new SSquare(sizeOfSquare);
29           //paint the rectangles
30           paintTheRectangle(miro,square,nrOfRows,nrOfColumns);
31       }
32   
33       private int getNumber(String prompt) {
34           String nss = JOptionPane.showInputDialog(null,prompt+"?");
35           Scanner scanner = new Scanner(nss);
36           return scanner.nextInt();
37       }
38   
39       private void paintTheRectangle(SPainter miro, SSquare square, int nrOfRows, int nrOfColumns) {
40           //position the painter to paint the rectangle of squares
41           miro.mlt(((nrOfColumns-1)/2.0) * square.side());
42           miro.mbk(((nrOfRows-1)/2.0) * square.side());
43           //paint the rectangle of squares
44           int i = 1;
45           while (i <= nrOfRows) {
46               paintOneRow(miro,nrOfColumns,square);
47               miro.mfd(square.side());
48               i = i+1;
49           }
50           //make the method invariant with respect to painter position
51           miro.mrt(((nrOfColumns-1)/2.0) * square.side());
52           miro.mfd(((nrOfRows-1)/2.0) * square.side());
53       }
54   
55       private void paintOneRow(SPainter miro, int nrOfColumns, SSquare square) {
56           int k = 1;
57           while (k <= nrOfColumns) {
58               paintOneSquare(miro,square);
59               miro.mrt(square.side());
60               k = k+1;
61           }
62           //make the method invariant with respect to painter position
63           miro.mlt(nrOfColumns*square.side());
64       }
65   
66       private void paintOneSquare(SPainter miro, SSquare square) {
67           square.s2();
68           miro.setColor(randomColor());
69           miro.paint(square);
70           miro.setColor(Color.BLACK);
71           miro.draw(square);
72           square.x2();
73       }
74   
75       private Color randomColor() {
76           Random rgen = new Random();
77           int r = rgen.nextInt(256);
78           int g = rgen.nextInt(256);
79           int b = rgen.nextInt(256);
80           return new Color(r,b,g);
81       }
82   
83       public Number2() {
84           paintTheImage();
85       }
86       public static void main(String[] args) {
87           SwingUtilities.invokeLater(new Runnable() {
88               @Override
89               public void run() {
90                   new Number2();
91               }
92           });
93       }
94   
95   }
96