1    /* 
2     * A variant of program Number2. 
3     * Program to paint randomly colored, unframed dots 
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.SCircle;
16   
17   public class Number3 {
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 sizeOfCircle = getNumber("Square side length");
24           //Establish the painter.
25           int height = nrOfRows * sizeOfCircle;
26           int width = nrOfColumns * sizeOfCircle;
27           SPainter miro = new SPainter("Number 3", width + 50, height + 50);
28           miro.setBrushWidth(4);
29           SCircle circle = new SCircle (sizeOfCircle);
30           //Paint the rectangles.
31           paintRectangle(miro, circle, 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, SCircle circle, int nrOfRows, int nrOfColumns) {
41           // Position the painter to paint the rectangle of squares.
42           miro.mlt(((nrOfColumns - 1) / 2.0) * circle.diameter());
43           miro.mbk(((nrOfRows - 1) / 2.0) * circle.diameter());
44           //Paint the rectangle of squares.
45           int i = 1;
46           while (i <= nrOfRows) {
47               paintOneRow(miro, nrOfColumns, circle);
48               miro.mfd(circle.diameter());
49               i = i + 1;
50           }
51           //Make the method invariant with respect to painter position.
52           miro.mrt(((nrOfColumns - 1) / 2.0) * circle.diameter());
53           miro.mfd(((nrOfRows - 1) / 2.0) * circle.diameter());
54       }
55   
56       private static void paintOneRow(SPainter miro, int nrOfColumns, SCircle circle) {
57           int i = 1;
58           while (i <= nrOfColumns) {
59               paintOneCircle(miro, circle);
60               miro.mrt(circle.diameter());
61               i = i + 1;
62           }
63           miro.mlt(nrOfColumns * circle.diameter());
64       }
65   
66       private static void paintOneCircle(SPainter miro, SCircle circle) {
67           circle.s2();
68           miro.setColor(randomColor());
69           miro.paint(circle);
70           circle.x2();
71   
72       }
73   
74       private static Color randomColor() {
75           Random rgen = new Random();
76           int r = rgen.nextInt(256);
77           int g = rgen.nextInt(256);
78           int b = rgen.nextInt(256);
79           return new Color(r, b, g);
80       }
81   
82       public Number3(){
83           paintTheImage();
84       }
85   
86       public static void main(String[] args){
87           SwingUtilities.invokeLater(new Runnable() {
88               @Override
89               public void run() {
90                   new Number3();
91               }
92           });
93   
94       }
95   }
96