1    /* 
2    *Program to pain a rectangle, centered in the cavas, made up of randomly 
3    * colored, black framed squares. 
4     */
5    
6    package npw;
7    
8    import java.awt.Color;
9    import java.util.Random;
10   import java.util.Scanner;
11   import javax.swing.JOptionPane;
12   import javax.swing.SwingUtilities;
13   
14   import painter.SPainter;
15   import shapes.SSquare;
16   
17   public class Number1 {
18       // The solution to the graphical problem.
19       private void paintTheImage() {
20           // Get the input information from the user.
21           int nrOfRows = getNumber("rows");
22           int nrOfColumns = getNumber("columns");
23           int sizeOfSquare = getNumber("Square side length");
24           //Establish the painter.
25           int height = nrOfRows * sizeOfSquare;
26           int width = nrOfColumns * sizeOfSquare;
27           SPainter miro = new SPainter("Number 1", width + 50, height + 50);
28           miro.setBrushWidth(4);
29           SSquare square = new SSquare(sizeOfSquare);
30           //Paint the rectangles.
31           paintRectangle(miro, square, nrOfRows, nrOfColumns);
32       }
33   
34       private int getNumber(String prompt) {
35           String nss = JOptionPane.showInputDialog(null,prompt+"?");
36           Scanner scanner = new Scanner(nss);
37           return scanner.nextInt();
38       }
39   
40       private static void paintRectangle(SPainter miro, SSquare square, int nrOfRows, int nrOfColumns) {
41           // Position the painter to paint the rectangle of squares.
42           miro.mlt(((nrOfColumns - 1) / 2.0) * square.side());
43           miro.mbk(((nrOfRows - 1) / 2.0) * square.side());
44           //Paint the rectangle of squares.
45           int i = 1;
46           while (i <= nrOfRows) {
47               paintOneRow(miro, nrOfColumns, square);
48               miro.mfd(square.side());
49               i = i + 1;
50           }
51           //Make the method invariant with respect to painter position.
52           miro.mrt(((nrOfColumns - 1) / 2.0) * square.side());
53           miro.mfd(((nrOfRows - 1) / 2.0) * square.side());
54       }
55   
56       private static void paintOneRow(SPainter miro, int nrOfColumns, SSquare square) {
57           int i = 1;
58           while (i <= nrOfColumns) {
59               paintOneSquare(miro, square);
60               miro.mrt(square.side());
61               i = i + 1;
62           }
63           miro.mlt(nrOfColumns * square.side());
64       }
65   
66       private static void paintOneSquare(SPainter miro, SSquare square) {
67           miro.setColor(randomColor());
68           miro.paint(square);
69           miro.setColor(Color.BLACK);
70           miro.draw(square);
71       }
72   
73       private static Color randomColor() {
74           Random rgen = new Random();
75           int r = rgen.nextInt(256);
76           int g = rgen.nextInt(256);
77           int b = rgen.nextInt(256);
78           return new Color(r, b, g);
79       }
80   
81       public Number1(){
82           paintTheImage();
83       }
84   
85       public static void main(String[] args){
86           SwingUtilities.invokeLater(new Runnable() {
87               @Override
88               public void run() {
89                   new Number1();
90               }
91           });
92   
93       }
94   }
95