1    /* 
2     * Program to paint a rectangle, centered in the canvas, made up of randomly 
3     * colored, spaced circles. The user inputs the number of rows and columns. 
4     */
5    
6    package npw;
7    
8    import java.awt.Color;
9    import java.util.Scanner;
10   import javax.swing.JOptionPane;
11   import javax.swing.SwingUtilities;
12   
13   import painter.SPainter;
14   import shapes.SCircle;
15   
16   public class Number4 {
17       // The solution to the graphical problem.
18       private void paintTheImage() {
19           // Get the input information fron the user.
20           int nrOfRows = getNumber("rows");
21           int nrOfColumns = getNumber("columns");
22           int radius = getNumber("radius");
23           // Establish the painter.
24           int height = nrOfRows * 2 * radius;
25           int width = nrOfColumns * 2 * radius;
26           SPainter miro = new SPainter("Number 4",width+50,height+50);
27           miro.setBrushWidth(4);
28           SCircle circle = new SCircle(radius);
29           String command = JOptionPane.showInputDialog(null, "pick blue, red, or green dots");
30           if (command == null) {
31               command = "exit";
32           } // user clicked on Cancel
33           if (command.equalsIgnoreCase("blue")) {
34               miro.setColor(Color.BLUE);
35           } else if (command.equalsIgnoreCase("red")) {
36               miro.setColor(Color.RED);
37           } else if (command.equalsIgnoreCase("green")) {
38               miro.setColor(Color.GREEN);
39           } else {
40               miro.setColor(Color.BLACK);
41           }
42           // Paint the rectangles.
43           paintRectangle(miro,circle,nrOfRows,nrOfColumns);
44       }
45   
46       private static int getNumber(String prompt) {
47           String nss = JOptionPane.showInputDialog(null,prompt+"?");
48           Scanner scanner = new Scanner(nss);
49           return scanner.nextInt();
50       }
51   
52       private static void paintRectangle(SPainter miro, SCircle circle,
53                                          int nrOfRows, int nrOfColumns) {
54           // Position the painter to paint the rectangle of squares.
55           miro.mlt(((nrOfColumns-1)/2.0) * circle.diameter());
56           miro.mbk(((nrOfRows-1)/2.0) * circle.diameter());
57           // Paint the rectangle of squares.
58           int i = 1;
59           while ( i <= nrOfRows) {
60               paintOneRow(miro,nrOfColumns,circle);
61               miro.mfd(circle.diameter());
62               i = i + 1;
63           }
64           // Make the method invariant with respect to painter position.
65           miro.mrt(((nrOfColumns-1)/2.0) * circle.diameter());
66           miro.mfd(((nrOfRows-1)/2.0) * circle.diameter());
67       }
68   
69       private static void paintOneRow(SPainter miro, int nrOfColumns, SCircle circle) {
70           int i = 1;
71           while ( i <= nrOfColumns ) {
72               paintOneCircle(miro,circle);
73               miro.mrt(circle.diameter());
74               i = i + 1;
75           }
76           miro.mlt(nrOfColumns*circle.diameter());
77       }
78   
79       private static void paintOneCircle(SPainter miro, SCircle circle) {
80           circle.s2();
81           miro.paint(circle);
82           circle.x2();
83           }
84   
85       public Number4(){
86           paintTheImage();
87       }
88   
89       public static void main(String[] args){
90           SwingUtilities.invokeLater(new Runnable() {
91               @Override
92               public void run() {
93                   new Number4();
94               }
95           });
96       }
97   }