Re: need help, I'm frustrated

Posted by Hao Jiang-3 on Jul 17, 2008; 10:32pm
URL: http://imagej.273.s1.nabble.com/need-help-I-m-frustrated-tp3695559p3695565.html

Hi Wayne, I've not problem to run your macro, but just can't make it
work in my code.  

public void drawPoints()
{
        if (HDPoints == null)
        {
                return;
        }

        imp = WindowManager.getCurrentImage();
        ImageCanvas ic = imp.getCanvas();
       
        fi = (IntermapFileInfo)imp.getOriginalFileInfo();
        int x, y;
        Calibration cal = imp.getCalibration();
        Rectangle r = imp.getWindow().getCanvas().getSrcRect();

        displayList = new Vector();


        for (int i = 0; i < HDPoints.size(); i++)
        {
                x =
(int)(((HeightSamplePoint)HDPoints.elementAt(i)).getX() /
(fi.decimation));
                y =
(int)(((HeightSamplePoint)HDPoints.elementAt(i)).getY() /
(fi.decimation)) + (int)(cal.yOrigin / fi.decimation);

                if (y >= 0 && y <= fi.height && x >= r.getX() && x <=
r.getX() + r.getWidth())
                {
                        displayList.add(HDPoints.elementAt(i));
                }
        }
       
        int size = displayList.size();

        int[] xPoints = new int[size];
        int[] yPoints = new int[size];

        for(int i=0; i<size; i++){
                HeightSamplePoint point =
(HeightSamplePoint)displayList.elementAt(i);
                xPoints[i]=(int)point.getX();
                yPoints[i]=(int)point.getY();
        }

        Roi roi = new PointRoi(xPoints, yPoints, size);
        IJ.getImage().setRoi(roi);
}

I used log to output points in the 2nd for loop, all there, but just
can't draw them on image

What else I have missed?

Thanks

Hao



-----Original Message-----
From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of
Wayne Rasband
Sent: Thursday, July 17, 2008 12:55 PM
To: [hidden email]
Subject: Re: need help, I'm frustrated


 > Thank you for you reply, I tried this, it worked fine with only few
> points. However, for one test with 20K points, it took almost  >
forever to finish. I believe it's because of "or" operation.

This macro displays 20,000 points as a point selection in just a few
seconds.

   size = 2000;
   count = 20000;
   x = newArray(count);
   y = newArray(count);
   for (i=0; i<count; i++) {
      x[i] = random*size;
      y[i] = random*size;
   }
   newImage("Test", "8-bit Black", size, size, 1);
   run("Point Tool...", "mark=0 selection=yellow");
   makeSelection("point", x, y);

-wayne




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