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intrepidcoderintrepidcoder
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Update whitespace
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-97
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‎RgbRandomWalk.java

+94-97
Original file line numberDiff line numberDiff line change
@@ -5,100 +5,97 @@
55
import java.util.Random;
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public class RgbRandomWalk {
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private static Random prng = new Random();
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private static int step(int pos, int upperBound) {
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if (pos <= 0) {
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return prng.nextInt(2);
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} else if (pos >= upperBound - 1) {
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return upperBound - 1 - prng.nextInt(2);
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} else {
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return pos - 1 + prng.nextInt(3);
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}
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}
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public static void main(String[] args) {
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long start = System.currentTimeMillis();
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String fileName = "";
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int width = 1920, height = 1080;
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int increment = 8;
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int steps = 6000000;
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String imgFormat = "png";
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if (args.length != 4) {
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System.out.println("Usage: java RgbRandomWalk <imagefilepath> <width> <height> <steps>");
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System.exit(0);
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} else {
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try {
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fileName = args[0];
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width = Integer.parseInt(args[1], 10);
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height = Integer.parseInt(args[2], 10);
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steps = Integer.parseInt(args[3], 10);
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} catch (NumberFormatException e) {
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System.out.println("Usage: java RgbRandomWalk <imagefilepath> <width> <height> <steps>");
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System.out.println("Error: Invalid number.");
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System.exit(0);
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}
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if (width <= 0 || height <= 0 || steps <= 0) {
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System.out.println("Usage: java RgbRandomWalk <imagefilepath> <width> <height> <steps>");
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System.out.println("Error: Negative number.");
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System.exit(0);
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}
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}
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BufferedImage img;
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Color c;
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// Good parameters are 1920 x 1080, intensity increment 8, and steps = 6000000.
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int rX = width / 2, rY = height / 2;
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int gX = width / 2, gY = height / 2;
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int bX = width / 2, bY = height / 2;
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int r = 0, g = 0, b = 0;
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// int sRGB, other;
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img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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rX = width / 2;
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rY = height / 2;
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gX = width / 2;
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gY = height / 2;
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bX = width / 2;
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bY = height / 2;
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for (int j = 0; j < steps; j++) {
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rX = step(rX, width);
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rY = step(rY, height);
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gX = step(gX, width);
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gY = step(gY, height);
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bX = step(bX, width);
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bY = step(bY, height);
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c = new Color(img.getRGB(rX, rY));
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img.setRGB(rX, rY, (c.getRGB() & 0xff00ffff) | (Math.min(c.getRed() + increment, 255) << 16));
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c = new Color(img.getRGB(gX, gY));
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img.setRGB(gX, gY, (c.getRGB() & 0xffff00ff) | (Math.min(c.getGreen() + increment, 255) << 8));
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c = new Color(img.getRGB(bX, bY));
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img.setRGB(bX, bY, (c.getRGB() & 0xffffff00) | (Math.min(c.getBlue() + increment, 255)));
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}
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try {
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File outputfile = new File(fileName);
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ImageIO.write(img, imgFormat, outputfile);
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} catch (Exception e) {
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System.out.println("Error: cannot open the file.");
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System.exit(0);
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}
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long time = System.currentTimeMillis()-start;
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System.out.printf("Time used: %dm, %ds, %dms.%n", time / 60000, (time / 1000) % 60, time % 1000);
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}
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}
8+
private static Random prng = new Random();
9+
10+
private static int step(int pos, int upperBound) {
11+
if (pos <= 0) {
12+
return prng.nextInt(2);
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} else if (pos >= upperBound - 1) {
14+
return upperBound - 1 - prng.nextInt(2);
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} else {
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return pos - 1 + prng.nextInt(3);
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}
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}
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public static void main(String[] args) {
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long start = System.currentTimeMillis();
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String fileName = "";
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int width = 1920, height = 1080;
24+
int increment = 8;
25+
int steps = 6000000;
26+
String imgFormat = "png";
27+
28+
if (args.length != 4) {
29+
System.out.println("Usage: java RgbRandomWalk <imagefilepath> <width> <height> <steps>");
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System.exit(0);
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} else {
32+
try {
33+
fileName = args[0];
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width = Integer.parseInt(args[1], 10);
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height = Integer.parseInt(args[2], 10);
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steps = Integer.parseInt(args[3], 10);
37+
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} catch (NumberFormatException e) {
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System.out.println("Usage: java RgbRandomWalk <imagefilepath> <width> <height> <steps>");
40+
System.out.println("Error: Invalid number.");
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System.exit(0);
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}
43+
44+
if (width <= 0 || height <= 0 || steps <= 0) {
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System.out.println("Usage: java RgbRandomWalk <imagefilepath> <width> <height> <steps>");
46+
System.out.println("Error: Negative number.");
47+
System.exit(0);
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}
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}
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51+
BufferedImage img;
52+
Color c;
53+
// Good parameters are 1920 x 1080, intensity increment 8, and steps = 6000000.
54+
55+
int rX = width / 2, rY = height / 2;
56+
int gX = width / 2, gY = height / 2;
57+
int bX = width / 2, bY = height / 2;
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int r = 0, g = 0, b = 0;
59+
// int sRGB, other;
60+
61+
62+
img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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rX = width / 2;
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rY = height / 2;
66+
gX = width / 2;
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gY = height / 2;
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bX = width / 2;
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bY = height / 2;
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71+
for (int j = 0; j < steps; j++) {
72+
rX = step(rX, width);
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rY = step(rY, height);
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gX = step(gX, width);
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gY = step(gY, height);
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bX = step(bX, width);
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bY = step(bY, height);
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c = new Color(img.getRGB(rX, rY));
80+
img.setRGB(rX, rY, (c.getRGB() & 0xff00ffff) | (Math.min(c.getRed() + increment, 255) << 16));
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82+
c = new Color(img.getRGB(gX, gY));
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img.setRGB(gX, gY, (c.getRGB() & 0xffff00ff) | (Math.min(c.getGreen() + increment, 255) << 8));
84+
85+
c = new Color(img.getRGB(bX, bY));
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img.setRGB(bX, bY, (c.getRGB() & 0xffffff00) | (Math.min(c.getBlue() + increment, 255)));
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}
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try {
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File outputfile = new File(fileName);
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ImageIO.write(img, imgFormat, outputfile);
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} catch (Exception e) {
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System.out.println("Error: cannot open the file.");
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System.exit(0);
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}
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long time = System.currentTimeMillis()-start;
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System.out.printf("Time used: %dm, %ds, %dms.%n", time / 60000, (time / 1000) % 60, time % 1000);
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}
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}

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