1    /* 
2     *This program will ask for what color dots to print. 
3     * There are three choices Green, Blue, or Red. 
4     */
5    package npw;
6    import java.awt.Color;
7    import java.util.Scanner;
8    import javax.swing.JOptionPane;
9    import javax.swing.SwingUtilities;
10   import painter.SPainter;
11   import shapes.SCircle;
12   
13   public class Number4 {
14       //Solution to the graphical problem.
15       private void paintTheImage() {
16           //Get the input info from the user.
17           int numOfRows = getNumber("rows");
18           int numOfColumns = getNumber("columns");
19           int sizeOfCircle = getNumber("circle side length");
20           String whatColor = getColor("What color dots? Options are... Green, Blue and, Red");
21           //Establishing the painter.
22           int height = numOfRows * sizeOfCircle;
23           int width = numOfColumns * sizeOfCircle;
24           SPainter leo = new SPainter("Number 4",width+50,height+50);
25           leo.setBrushWidth(4);
26           SCircle circle = new SCircle(sizeOfCircle);
27           //paint the rectangles
28           paintCircle(leo,circle,numOfRows,numOfColumns, whatColor);
29       }
30   
31       private String getColor(String prompt) {
32           String nss = JOptionPane.showInputDialog(null,prompt+"?");
33           Scanner color = new Scanner(nss);
34           return color.nextLine();
35       }
36   
37       private int getNumber(String prompt) {
38           String nss = JOptionPane.showInputDialog(null,prompt+"?");
39           Scanner scan = new Scanner(nss);
40           return scan.nextInt();
41       }
42       private void paintCircle(SPainter leo, SCircle circle, int numOfRows, int numOfColumns, String whatColor) {
43           //Position the painter to paint the rectangle of circles.
44           leo.mlt(((numOfColumns-1)/2.0)*circle.radius());
45           leo.mbk(((numOfRows-1)/2.0)*circle.radius());
46           //Paint the rectangle of circles.
47           int i = 1;
48           while (i <= numOfRows) {
49               paintOneRow(leo,numOfColumns,circle, whatColor);
50               leo.mfd(circle.radius());
51               i = i + 1;
52           }
53           //Used to make method invariant with respect to painter position.
54           leo.mrt(((numOfColumns-1)/2.0)*circle.radius());
55           leo.mfd(((numOfColumns-1)/2.0)*circle.radius());
56       }
57   
58       private void paintOneRow(SPainter leo, int numOfColumns, SCircle circle, String whatColor) {
59           int i = 1;
60           while (i <= numOfColumns) {
61               paintOneCircle(leo,circle, whatColor);
62               leo.mrt(circle.radius());
63               i = i + 1;
64           }
65           //invariant
66           leo.mlt(numOfColumns*circle.radius());
67       }
68   
69       private void paintOneCircle(SPainter leo, SCircle circle, String whatColor) {
70           circle.setRadius(((int) circle.radius())/4);
71           if (whatColor.equalsIgnoreCase("green")) {
72               leo.setColor(Color.GREEN);
73           } else if (whatColor.equalsIgnoreCase("red")) {
74               leo.setColor(Color.RED);
75           } else if (whatColor.equalsIgnoreCase("blue")) {
76               leo.setColor(Color.BLUE);
77           } else {
78               leo.setColor(Color.BLACK);
79           }
80           leo.paint(circle);
81           circle.setRadius(((int) circle.radius())*4);
82   
83   
84   
85       }
86   
87       public Number4(){
88           paintTheImage();
89       }
90       public static  void main(String[] args){
91           SwingUtilities.invokeLater(new Runnable() {
92               @Override
93               public void run() {
94                   new Number4();
95               }
96           });
97       }
98   }