1    /* 
2     * Program to paint a rectangle, centered in the canvas, made up of randomly 
3     * colored, circles. 
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   
18   public class Number3 {
19       // The solution to the graphical problem.
20       private void paintTheImage() {
21           // Get the input information from the user.
22           int nrOfRows = getNumber("rows");
23           int nrOfColumns = getNumber("columns");
24           int sizeOfDiameter = getNumber("circle diameter");
25           // Establish the painter.
26           int height = nrOfRows * sizeOfDiameter;
27           int width = nrOfColumns * sizeOfDiameter;
28           SPainter miro = new SPainter("Number 3",width+50,height+50);
29           miro.setBrushWidth(4);
30           SCircle circle = new SCircle(sizeOfDiameter / 2.0);
31           // Paint the rectangles.
32           paintRectangle(miro,circle,nrOfRows,nrOfColumns);
33       }
34   
35       private static int getNumber(String prompt) {
36           String nss = JOptionPane.showInputDialog(null,prompt+"?");
37           Scanner scanner = new Scanner(nss);
38           return scanner.nextInt();
39       }
40   
41       private static void paintRectangle(SPainter miro, SCircle circle,
42                                          int nrOfRows, int nrOfColumns) {
43           // Position the painter to paint the rectangle of circles.
44           miro.mlt(((nrOfColumns-1)/2.0) * circle.diameter());
45           miro.mbk(((nrOfRows-1)/2.0) * circle.diameter());
46           // Paint the rectangle of circles.
47           int i = 1;
48           while ( i <= nrOfRows) {
49               paintOneRow(miro,nrOfColumns,circle);
50               miro.mfd(circle.diameter());
51               i = i + 1;
52           }
53           // Make the method invariant with respect to painter position.
54           miro.mrt(((nrOfColumns-1)/2.0) * circle.diameter());
55           miro.mfd(((nrOfRows-1)/2.0) * circle.diameter());
56       }
57   
58       private static void paintOneRow(SPainter miro, int nrOfColumns, SCircle circle) {
59           int i = 1;
60           while ( i <= nrOfColumns ) {
61               paintOneCircle(miro,circle);
62               miro.mrt(circle.diameter());
63               i = i + 1;
64           }
65           miro.mlt(nrOfColumns*circle.diameter());
66       }
67   
68       private static void paintOneCircle(SPainter miro, SCircle circle) {
69           circle.s2();
70           miro.setColor(randomColor());
71           miro.paint(circle);
72           circle.x2();
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   }