Re: Drawing line on ImageIcon on panel after getting data

 bH <>
Thu, 01 Nov 2007 18:05:38 -0700
On Oct 25, 11:13 pm, "Andrew Thompson" <u32984@uwe> wrote:

bH wrote:


public class IconMapShoScale extends JPanel{

This example might have been an SSCCE except for:
a) line wrap, which had to be fixed before it compiled
b) lack of images locally.

For the first, you might try <>
This little tool shows the width of the source/text pasted
in the text area. I recommned limiting it to '62 chars' for
usenet posts.

For the second, try obtaining images that are small (in bytes),
but large enough (in width/height) to show the problem,
directly off the net. If you have a site of your own, upload
some examples to use, otherwise the code might get them
off another site.

Here is one image search..

That search locates images that are 'small' in width/height.

As to the technical side of the problem, I suspect it is
non-optimal to create an ImageIcon. I would tend to use
a JPanel, override paintComponent and draw the Image
directly (Graphics.drawImage()). Once the points are
obtained, it is a simple matter to Graphics.drawLine()
(obviously, draw the lines *after* the image itself is drawn).

Andrew Thompson

Message posted via

Hi Andrew,

Thanks for the text width checker.
Taking your suggestions and making revisions using your suggestions,
This is supplied below.

import javax.swing.*;
import java.awt.*;
import javax.swing.border.BevelBorder;
import java.awt.event.*;

/* Notes for use....
 * Map scale enter number to be used; i.e. 600
 * Click points requried
 * [0] Click point Map Location of City 1
 * [1] Click point Map Location of City 2
 * [3] Click on the point Scale Chart at the 0 Minimum Value
 * [4] Click on the point Scale Chart at the Maximum Value

public class IconMapShoScaleImgs extends JFrame{
  int deltaAddrX = 0;
  int deltaAddrY = 0;
  int points = 4;
  int dataPointX[]= new int[points];
  int dataPointY[]= new int[points];
  int distanceResult = 0;
  double distanceCalc = 0;
  double deltaScaleX = 0;
  int scale = 0;
  Point clickPoint = null;
  int ptCounter = 0;
  JPanel infoPanel = new JPanel();
  JLabel scaleLbl = new JLabel("Show Scale Larger NUMBER Used");
  JLabel distLbl = new JLabel("After 4 Clicks The mi/km Between Points
  JTextField scaleFld;
  JTextField mileFld;

// Constructor
  public IconMapShoScaleImgs() {
    super("Distances Calculated by Click Points on Map");
    this.setLayout(new BorderLayout());
    Image img = null ;
      img = java.awt.Toolkit.getDefaultToolkit().
australia_sm_2007.gif" ));
      // good site for maps with other scale charts
    } catch (Exception e)
      e.printStackTrace( System.out ) ;
    JLabel label = new JLabel(new ImageIcon(img) ) ;
    getContentPane().add( label ) ;
    BevelBorder loweredBevelBorder = (BevelBorder)BorderFactory.
    this.addMouseListener(new MouseAdapter() {
      public void mousePressed(MouseEvent event){
        clickPoint = event.getPoint();
        dataPointX[ptCounter] = clickPoint.x;
        dataPointY[ptCounter] = clickPoint.y;

        if (ptCounter > 3){
          //taking it in steps first between two cities.
          deltaAddrX = dataPointX[1] - dataPointX[0];
          deltaAddrY = dataPointY[1] - dataPointY[0];
          distanceCalc = Math.pow(((deltaAddrX * deltaAddrX) +
                                   (deltaAddrY * deltaAddrY)), 0.5);

          //From the scale chart is horizontal .. Y is not needed
          double deltaScaleX = Math.abs(dataPointX[3] -

          scale = (int)(Double.parseDouble(scaleFld.getText()));
          distanceCalc = distanceCalc/deltaScaleX * scale;
          distanceResult = (int)distanceCalc;

          // making possible other measurements from the same map
          deltaScaleX = 0;
          distanceCalc = 0;
          ptCounter = 0;

// infoPanel re: map scale, resultant of clicks measure.
    this.add(infoPanel, BorderLayout.SOUTH);
    scaleFld = new JTextField(6);
    mileFld = new JTextField(6);

    pack() ;
    setLocationRelativeTo(null) ;

  public void paint(Graphics g){
    if (ptCounter > 1){
  public static void main(String[] args) {

    IconMapShoScaleImgs IconMapShoScaleImgs1 = new

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