Help them understand how to display a raster image
Hello.I apologize in advance if this sounds a bit complicated issue, but I'm a little confused as to how to go about it.
I have an Ascii-grid file exported from ArcMap and I want to draw on a JPanel.
This particular grid is a DEM, but it would be good if it could produce this for any network, if it makes a difference.
The problem is I don't really even know where to begin... I looked at using templates, buffers of data, etc. for the creation of a frame, but I don't really know how to enter the ascii data that I have in one of these.
Can I remove the integer values pixel data in the file before etc and if so how can I go about it?
Also is it possible to do a color model of an int array standard, if it was created in a particular model, for example to the designated height values.
Help to identify the ways to go about this would be very welcome because I am lost about what to do. Even just a few tips in the right direction. I'm more that happy to go work it out I really don't know where to start.
See you soon.
Sounds something like a map of contours. I don't know there must be a technically superior (read: horribly complicated) way to do this, use IndexColorModel, WriteableRaster etc etc, but if performance is satisfactory, I would go with a simple BufferedImage and setRGB.
import java.awt.Color;
import java.awt.image.BufferedImage;
import javax.swing.*;
public class ContourMap {
private int[] colors = {
Color.BLACK.getRGB(),
Color.GREEN.getRGB(),
Color.YELLOW.getRGB(),
Color.RED.getRGB()
};
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new ContourMap().makeUI();
}
});
}
public void makeUI() {
String[] strData = {
"000000000000000",
"000000111000000",
"000111221110000",
"001112222111000",
"001122332211000",
"001112222111000",
"000111221110000",
"000000111000000",
"000000000000000"
};
BufferedImage image = new BufferedImage(strData.length, strData[0].length(),
BufferedImage.TYPE_INT_ARGB);
for (int i = 0; i < strData.length; i++) {
for (int j = 0; j < strData[0].length(); j++) {
image.setRGB(i, j, colors[strData.charAt(j) - '0']);}System.out.println();}JLabel label = new JLabel(new ImageIcon(image), JLabel.CENTER);
JFrame frame = new JFrame();frame.add(label);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setSize(200, 200);frame.setLocationRelativeTo(null);frame.setVisible(true);}}db
edit And oh, the data is in a hardcoded String array only because I couldn't be bothered adding all the commas to make it a int[][] after copying from your post
Edited by: Darryl Burke
Tags: Java
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