1    /* 
2     * Program to paint a rectangle, centered in the canvas, made up of randomly colored, 
3     * black-framed squares with whitespace between, above, and below each square 
4     */
5    
6    package npw;
7    
8    import painter.SPainter;
9    import shapes.SSquare;
10   import javax.swing.*;
11   import java.awt.*;
12   import java.util.Random;
13   import java.util.Scanner;
14   
15   public class Number2 {
16       //The solution to the graphical problem
17       private void paintTheImage() {
18           //Get the input info from the user
19           int nrOfRows = getNumber("rows");
20           int nrOfColumns = getNumber("columns");
21           int sizeOfSquare = getNumber("square side length");
22           //Establish the painter
23           int height = nrOfRows * sizeOfSquare;
24           int width = nrOfColumns * sizeOfSquare;
25           SPainter miro = new SPainter("Number 2", width+50, height+50);
26           miro.setBrushWidth(4);
27           SSquare square = new SSquare(sizeOfSquare);
28           //Paint the rectangles
29           paintRectangle(miro, square, nrOfRows, nrOfColumns);
30       }
31   
32       private static int getNumber(String prompt) {
33           String nss = JOptionPane.showInputDialog(null, prompt+"?");
34           Scanner scanner = new Scanner(nss);
35           return scanner.nextInt();
36       }
37   
38       private static void paintRectangle(SPainter miro, SSquare square, int nrOfRows, int nrOfColumns) {
39           //Position the painter to paint the rectangle of squares
40           miro.mlt(((nrOfColumns-1)/2.0) * square.side());
41           miro.mbk(((nrOfRows-1)/2.0) * square.side());
42           //Paint the rectangle of squares
43           int i = 1;
44           while(i <= nrOfRows) {
45               paintOneRow(miro, nrOfColumns, square);
46               miro.mfd(square.side());
47               i++;
48           }
49           //Make the method invariant with respect to pointer position
50           miro.mrt(((nrOfColumns-1)/2.0) * square.side());
51           miro.mfd(((nrOfRows-1)/2.0) * square.side());
52       }
53   
54       private static void paintOneRow(SPainter miro, int nrOfColumns, SSquare square) {
55           int i = 1;
56           while(i <= nrOfColumns) {
57               paintOneSquare(miro, square);
58               miro.mrt(square.side());
59               i++;
60           }
61           miro.mlt(nrOfColumns*square.side());
62       }
63   
64       private static void paintOneSquare(SPainter miro, SSquare square) {
65           square.s2(); //make square smaller by half to show white space
66           miro.setColor(randomColor());
67           miro.paint(square);
68           miro.setColor(Color.BLACK);
69           miro.draw(square);
70           square.x2(); //put square back to regular size so loop doesn't go cray
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 Number2() {
82           paintTheImage();
83       }
84   
85       public static void main(String[] args) {
86           SwingUtilities.invokeLater(new Runnable() {
87               @Override
88               public void run() {
89                   new Number2();
90               }
91           });
92       }
93   }