CloudFlare suffered a massive security issue affecting all of its customers, including Rosetta Code. All passwords not changed since February 19th 2017 have been expired, and session cookie longevity will be reduced until late March.--Michael Mol (talk) 05:15, 25 February 2017 (UTC)

Forest fire/Java/Graphics

From Rosetta Code

The processing and underlying forest encoding works the same as the text version, but the output is to a JPanel instead.

import java.awt.Color;
import java.awt.Graphics;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
 
import javax.swing.JFrame;
import javax.swing.JPanel;
 
public class Fire extends JFrame{
private static final char BURNING = 'w'; //w looks like fire, right?
private static final char TREE = 'T';
private static final char EMPTY = '.';
private static final double F = 0.02;
private static final double P = 0.01;
private static final double TREE_PROB = 0.5;
private List<String> land;
private JPanel landPanel;
 
public Fire(List<String> land){
this.land = land;
landPanel = new JPanel(){
@Override
public void paint(Graphics g) {
for(int y = 0; y < Fire.this.land.size();y++){
String row = Fire.this.land.get(y);
for(int x = 0; x < row.length();x++){
switch(row.charAt(x)){
case BURNING:
g.setColor(Color.RED);
break;
case TREE:
g.setColor(Color.GREEN);
break;
default: //will catch EMPTY
g.setColor(Color.WHITE);
}
g.fillRect(x*3, y*3, 3, 3);
}
}
}
};
//each block in the land is a 3x3 square
landPanel.setSize(this.land.get(0).length() * 3, this.land.size() * 3);
add(landPanel);
setSize(200, 200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
 
private List<String> process(List<String> land){
List<String> newLand = new LinkedList<String>();
for(int i = 0; i < land.size(); i++){
String rowAbove, thisRow = land.get(i), rowBelow;
if(i == 0){//first row
rowAbove = null;
rowBelow = land.get(i + 1);
}else if(i == land.size() - 1){//last row
rowBelow = null;
rowAbove = land.get(i - 1);
}else{//middle
rowBelow = land.get(i + 1);
rowAbove = land.get(i - 1);
}
newLand.add(processRows(rowAbove, thisRow, rowBelow));
}
return newLand;
}
 
private String processRows(String rowAbove, String thisRow,
String rowBelow){
String newRow = "";
for(int i = 0; i < thisRow.length();i++){
switch(thisRow.charAt(i)){
case BURNING:
newRow+= EMPTY;
break;
case EMPTY:
newRow+= Math.random() < P ? TREE : EMPTY;
break;
case TREE:
String neighbors = "";
if(i == 0){//first char
neighbors+= rowAbove == null ? "" : rowAbove.substring(i, i + 2);
neighbors+= thisRow.charAt(i + 1);
neighbors+= rowBelow == null ? "" : rowBelow.substring(i, i + 2);
if(neighbors.contains(Character.toString(BURNING))){
newRow+= BURNING;
break;
}
}else if(i == thisRow.length() - 1){//last char
neighbors+= rowAbove == null ? "" : rowAbove.substring(i - 1, i + 1);
neighbors+= thisRow.charAt(i - 1);
neighbors+= rowBelow == null ? "" : rowBelow.substring(i - 1, i + 1);
if(neighbors.contains(Character.toString(BURNING))){
newRow+= BURNING;
break;
}
}else{//middle
neighbors+= rowAbove == null ? "" : rowAbove.substring(i - 1, i + 2);
neighbors+= thisRow.charAt(i + 1);
neighbors+= thisRow.charAt(i - 1);
neighbors+= rowBelow == null ? "" : rowBelow.substring(i - 1, i + 2);
if(neighbors.contains(Character.toString(BURNING))){
newRow+= BURNING;
break;
}
}
newRow+= Math.random() < F ? BURNING : TREE;
}
}
return newRow;
}
 
public static List<String> populate(int width, int height){
List<String> land = new LinkedList<String>();
for(;height > 0; height--){//height is just a copy anyway
StringBuilder line = new StringBuilder(width);
for(int i = width; i > 0; i--){
line.append((Math.random() < TREE_PROB) ? TREE : EMPTY);
}
land.add(line.toString());
}
return land;
}
 
public void processN(int n) {
for(int i = 0;i < n; i++){
land = process(land);
try {
Thread.sleep(750);
} catch (InterruptedException e) {
e.printStackTrace();
}
repaint();
}
}
 
public static void main(String[] args){
List<String> land = Arrays.asList(".TTT.T.T.TTTT.T",
"T.T.T.TT..T.T..",
"TT.TTTT...T.TT.",
"TTT..TTTTT.T..T",
".T.TTT....TT.TT",
"...T..TTT.TT.T.",
".TT.TT...TT..TT",
".TT.T.T..T.T.T.",
"..TTT.TT.T..T..",
".T....T.....TTT",
"T..TTT..T..T...",
"TTT....TTTTTT.T",
"......TwTTT...T",
"..T....TTTTTTTT",
".T.T.T....TT...");
Fire fire = new Fire(land);
fire.processN(5);
 
land = populate(50, 50);
Fire fire2 = new Fire(land);
fire2.processN(10);
}
}

Output sample:

JavaForest.png