Re: Drawing line on ImageIcon on panel after getting data

Lew <>
Thu, 01 Nov 2007 22:54:16 -0400
bH wrote:

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{

Probably better to have a JFrame than to be one, but no matter ...

    pack() ;
    setLocationRelativeTo(null) ;

Shouldn't all this be happening on the EDT?

  public static void main(String[] args) {

    IconMapShoScaleImgs IconMapShoScaleImgs1 = new

Wise writers on matters Java advise not to run everything from the
constructor. Bad Things can happen. Constructors are for construction - you
have a JFrame running in an incompletely-constructed object. Strangely, you
didn't in your first post.

- Run Swing / AWT actions on the EDT.
- Constructors should only construct.
- Prefer composition to inheritance. (Joshua Bloch, /Effective Java/)


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