Re: ImageProcessor.setLineWidth() isn't changing the line width state

Posted by Rasband, Wayne (NIH/NIMH) [E] on Apr 03, 2011; 3:14pm
URL: http://imagej.273.s1.nabble.com/ImageProcessor-setLineWidth-isn-t-changing-the-line-width-state-tp3685170p3685171.html

On Apr 3, 2011, at 2:46 AM, Junkshops wrote:

> Hi all,
>
> I must be doing something very wrong here as this seems so simple, but
> I'm at a loss to figure out what. I can't seem to set the line thickness
> on an ImageProcessor:
>
> import ij.ImagePlus;
> import ij.process.ByteProcessor;
>
> public class IJtest {
>
>    static int lineWidth = 5;
>
>    public static void main(String[] args) {
>        //ImagePlus newCell = IJ.createImage("", "8-bit", 512, 512, 1);
>        ImagePlus newCell = new ImagePlus("foo", new ByteProcessor(512,
> 512));
>        newCell.getProcessor().setLineWidth(lineWidth);
>        System.out.println("" + newCell.getProcessor().getLineWidth());
> //prints 1  
>    }
> }
>
> Obviously if I draw a line on the image and show() it, the line is also
> width 1.
>
> The getters and setters in the ImageProcessor code don't do anything
> special other than set the line width to 1 if it's < 1, so there's no
> reason the state shouldn't be saved that I can see.
>
> Can anyone tell me what I'm doing wrong?

The ImagePlus.getProcessor() method sets the line width to the current line width, which is set by using Edit>Options>Line Width or by double clicking on the line tool. You can avoid this problem by saving the ImageProcessor as a variable, for example:

   lineWidth = 5;
   imp = new ImagePlus("foo", new ByteProcessor(512, 512));
   ip = imp.getProcessor();
   ip.setLineWidth(lineWidth);
   print(ip.getLineWidth()); // prints 5

-wayne