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POBoundary fill (flood fill) algorithm to construct an interactive map. Java
 

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  1. POBoundary fill (flood fill) algorithm to construct an interactive map. Java
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    <p>I am building a US interactive map that will respond to user's input values to the JTable. I have already done this but without flood fill algorithm (each state had its own .png image). Now I have decided to use boundary fill OR seed fill... but it does not work somehow... Here is the FULL code:</p> <pre><code>import java.awt.Color; import java.awt.Container; import java.awt.Image; import java.awt.image.BufferedImage; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTable; public class MapTest extends JFrame { private static JTable table; private JTable tableS; private String[] states = {"US STATES", "Alabama", "Alaska", "Arizona" }; private JLabel map; private String[][] statesPixel = { { "alabama", "300", "300" }, { "alaska", "350", "350" }, { "arizona", "400", "400" }, { "arkansas", "450", "450" } }; public MapTest() throws InterruptedException { createMap(); } private void createMap() throws InterruptedException { Container contentPane = getContentPane(); contentPane.setBackground(Color.WHITE); contentPane.setLayout(null); contentPane.setSize(1220,700); tableS = new JTable(4,1); tableS.setBounds(1000,16,120,800); tableS.setRowHeight(12); int i = 0; while (i &lt; states.length) { tableS.setValueAt(states[i], i, 0); i++; } contentPane.add(tableS); table = new JTable(4,1); table.setBounds(1120,16,50,800); table.setRowHeight(12); int j = 0; while (j &lt; states.length) { table.setValueAt("100", j, 0); j++; } table.setValueAt("VALUE",0,0); contentPane.add(table); ExcelAdapter excelTable = new ExcelAdapter(table); map = new JLabel(); map.setIcon(new ImageIcon("map.png")); map.setBounds(150,50,800,600); contentPane.add(map); setTitle("Map"); setSize(1220,700); setVisible(true); setLocationRelativeTo(null); //updates~~ while (true) { for ( int k = 0; k &lt; statesPixel.length; k++) { int fill = Integer.parseInt( (String) table.getValueAt(k+1, 0)); boundaryFill4(Integer.parseInt(statesPixel[k][1]),Integer.parseInt(statesPixel[k][2]),statesPixel[k][0],fill+1,0); } } //******************************************************************* } private void boundaryFill4 (int x, int y, String state, int fill, int boundary) { int current; current = getPixel (x, y); if ((current != boundary) &amp;&amp; (current != fill)) { setPixel (x, y, fill); boundaryFill4 (x+1, y, state, fill, boundary); boundaryFill4 (x-1, y, state,fill, boundary); boundaryFill4 (x, y+1, state,fill, boundary); boundaryFill4 (x, y-1, state,fill, boundary) ; } } private int getPixel(int x, int y) { Image img = ((ImageIcon) map.getIcon()).getImage(); BufferedImage buffered = new BufferedImage(img.getWidth(null),img.getHeight(null), BufferedImage.TYPE_INT_ARGB); buffered.getGraphics().drawImage(img, 0, 0, null); int current = buffered.getRGB(x, y); return current; } private void setPixel(int x, int y, int fill) { Image img = ((ImageIcon) map.getIcon()).getImage(); BufferedImage buffered = new BufferedImage(img.getWidth(null),img.getHeight(null), BufferedImage.TYPE_INT_ARGB); buffered.getGraphics().drawImage(img, 0, 0, null); int red = fill; int green = red; int blue = red; Color c = new Color(buffered.getRGB(x, y)); c = new Color(red, green, blue); buffered.setRGB(x, y, c.getRGB()); } public static void main(String args[]) throws InterruptedException { MapTest map = new MapTest(); map.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } } </code></pre> <p>I also use ExcelAdapter.java, which is available online just to enable copy/paste to JTable. How come my code does not work...I have been debugging it... for a long time</p>
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      1. POBoundary fill (flood fill) algorithm to construct an interactive map. Java
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    1. COYou are using a recursive flood fill algorithm and this will definitely fail for large images. Scanline algorithm is best suited here. Check ***[this](http://en.wikipedia.org/wiki/Flood_fill)*** page for more info. An implementation of the algorithm can be found ***[here](http://stackoverflow.com/questions/14672861/how-to-add-mouseclicked-to-script/14673438#14673438)***
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    2. CO@Extreme Coders I am familiar with scanline algorithm, however, my problem is: the program does not even show any changes, it is if it ignores my code...The image would load, but no color changes happen AT ALL...BUT I do not get any ERRORs...
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    3. CO@Extreme Coders There is no problem with ExcelAdapter. I have it as a separate class. It works perfectly. I have already checked it 100% with sysout etc... I have this code written in a different way with ExcelAdapter...
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