1    package assign_4;
2    
3    import painter.SPainter;
4    import shapes.SCircle;
5    import javax.swing.*;
6    import java.awt.*;
7    import java.util.Random;
8    import java.util.Scanner;
9    
10   public class ColorfulAbstractGradient {
11       public static void main(String[] args) {
12           SwingUtilities.invokeLater(new Runnable() {
13               @Override
14               public void run() {
15                   new ColorfulAbstractGradient();
16               }
17           });
18       }
19   
20       public ColorfulAbstractGradient() {
21           paintTheImage();
22       }
23   
24       private void paintTheImage() {
25           //Grab the input information
26           int width = getNumber("width");
27           int height = getNumber("height");
28           int colWidth = getNumber("column width");
29           //Establish the painter
30           SPainter painter = new SPainter("Colorful Abstract Gradient", width, height);
31           SCircle dot = new SCircle(5);
32           //Move the painter to the upper left corner to get ready to paint the gradient
33           painter.mfd(height / 2);
34           painter.tl(90);
35           painter.mfd(width / 2 - 10);
36           painter.tl(90);
37           //Paint it!
38           paintGradient(painter, dot, height, width, colWidth);
39       }
40   
41       private static int getNumber(String prompt) {
42           String nss = JOptionPane.showInputDialog(null, prompt + "?");
43           Scanner scanner = new Scanner(nss);
44           return scanner.nextInt();
45       }
46   
47       private void paintGradient(SPainter painter, SCircle dot, int height, int width, int colWidth) {
48           int cols = 0;
49           //Calculate the number of columns. We want to fill the screen, but we don't want
50           //any dots only half on the canvas, so we subtract some space
51           int nrOfCols = (width / colWidth) - 2;
52           while (cols < nrOfCols) {
53               nextCol(painter, colWidth);
54               paintColumn(painter, dot, height);
55               cols = cols + 1;
56           }
57       }
58   
59       public void paintOneDot(SPainter painter, SCircle dot) {
60           randomColor(painter);
61           painter.paint(dot);
62       }
63   
64       public void randomColor(SPainter painter) {
65           Random randomGenerator = new Random();
66           int red = randomGenerator.nextInt(255);
67           int blue = randomGenerator.nextInt(255);
68           int green = randomGenerator.nextInt(255);
69           Color randomColor = new Color(red, green, blue);
70           painter.setColor(randomColor);
71       }
72   
73       //Dots are spaced tighter together near the bottom of the canvas
74       private void paintColumn(SPainter painter, SCircle dot, int height) {
75           int travel = 0;
76           int totalDistanceTraveled = 0;
77           //Paint a row with decreasing distance between dots
78           while (totalDistanceTraveled < height - (dot.radius() * 3)) {
79               travel = randomDistance((height - totalDistanceTraveled) / 4);
80               totalDistanceTraveled = totalDistanceTraveled + travel;
81               painter.mfd(travel);
82               paintOneDot(painter, dot);
83           }
84           //Make the method invariant with respect to painter position
85           painter.mbk(totalDistanceTraveled);
86       }
87   
88       //Moves the painter to the next column
89       private void nextCol(SPainter painter, int colWidth) {
90           painter.tl(90);
91           painter.mfd(colWidth);
92           painter.tr(90);
93       }
94   
95       private int randomDistance(int maxDistance) {
96           Random rgen = new Random();
97           return rgen.nextInt(maxDistance);
98       }
99   }
100