1    /* 
2     * Program to paint rows and columns of uniformly colored dots based on user input 
3     * (options are red, green, and blue), with white space in between each dot. 
4     */
5    
6    package npw;
7    
8    import painter.SPainter;
9    import shapes.SCircle;
10   import javax.swing.*;
11   import java.awt.*;
12   import java.util.Scanner;
13   
14   public class Number4 {
15       //The solution to the graphical problem
16       private void paintTheImage() {
17           //Get the input info from the user
18           int nrOfRows = getNumber("rows");
19           int nrOfColumns = getNumber("columns");
20           int sizeOfCircle = getNumber("circle radius");
21           String colorChoice = getColor("red, green, or blue");
22           //Establish the painter
23           int height = nrOfRows * sizeOfCircle;
24           int width = nrOfColumns * sizeOfCircle;
25           SPainter miro = new SPainter("Number 4", (width*2) + 50, (height*2) + 50);
26           miro.setBrushWidth(4);
27           SCircle circle = new SCircle(sizeOfCircle);
28           //Paint the rectangles
29           paintRectangle(miro, circle, colorChoice, 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 String getColor(String prompt) {
39           String colorString = JOptionPane.showInputDialog(null, prompt+"?");
40           Scanner scanner = new Scanner(colorString);
41           return scanner.next();
42       }
43   
44       private static void paintRectangle(SPainter miro, SCircle circle, String colorChoice, int nrOfRows, int nrOfColumns) {
45           //Position the painter to paint the rectangle of circles
46           miro.mlt(((nrOfColumns-1)/2.0) * circle.diameter());
47           miro.mbk(((nrOfRows-1)/2.0) * circle.diameter());
48           //Paint the rectangle of circles
49           int i = 1;
50           while(i <= nrOfRows) {
51               paintOneRow(miro, colorChoice, nrOfColumns, circle);
52               miro.mfd(circle.diameter());
53               i++;
54           }
55           //Make the method invariant with respect to pointer position
56           miro.mrt(((nrOfColumns-1)/2.0) * circle.diameter());
57           miro.mfd(((nrOfRows-1)/2.0) * circle.diameter());
58       }
59   
60       private static void paintOneRow(SPainter miro, String colorChoice, int nrOfColumns, SCircle circle) {
61           int i = 1;
62           while(i <= nrOfColumns) {
63               paintOneCircle(miro, colorChoice, circle);
64               miro.mrt(circle.diameter());
65               i++;
66           }
67           miro.mlt(nrOfColumns*circle.diameter());
68       }
69   
70       private static void paintOneCircle(SPainter miro, String colorChoice, SCircle circle) {
71           circle.s2(); //make dot smaller by half to show white space
72           if (colorChoice.equalsIgnoreCase("red")) {
73               miro.setColor(Color.RED);
74           } else if (colorChoice.equalsIgnoreCase("green")) {
75               miro.setColor(Color.GREEN);
76           } else if (colorChoice.equalsIgnoreCase("blue")) {
77               miro.setColor(Color.BLUE);
78           } else {
79               miro.setColor(Color.BLACK); //black dots if user enters an unaccepted color
80           }
81           miro.paint(circle);
82           circle.x2(); //put dot back to regular size so loop doesn't go cray
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   }