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Message-ID:  <[log in to unmask]>
Date:         Mon, 26 Feb 2001 14:51:25 +1100
Reply-To:     ImageJ Interest Group <[log in to unmask]>
Sender:       ImageJ Interest Group <[log in to unmask]>
From:         Greg Joss <[log in to unmask]>
Subject:      segmented line or POLYLINE ROI

Wayne,
I would like to create a segmented line or POLYLINE ROI.

The constructor
    public PolygonRoi(int[] xPoints, int[] yPoints, int nPoints, ImagePlus
imp, int type) {...
allows me to specify the points and
have the resultant ROI drawn as a polygon with closed endpoints
but I have been unable to find an interface to POLYLINE ROI's.

    public FreehandRoi(int x, int y, ImagePlus imp) {
accepts type = FREELINE; but then I cant supply the points list.

Getting access to the "Graphics g" object
 public void draw(Graphics g) {
        if (state!=CONSTRUCTING) {
            updatePolygon();
            g.setColor(ROIColor);
            if (type==POLYLINE || type==FREELINE)
                g.drawPolyline(xp2, yp2, nPoints);
so that I can do my own g.drawPolyline seems problematic
as I get an awt diagnostic in response to
Graphics graphics = this.imp.getImage().getGraphics();
 which says image must be off screen for getGraphics() call to be valid.

PolygonRoi is a workaround at the moment but
I would prefer to leave the drawn line open-ended.

The essesntial code is in 'gui', not 'plugins' so override is not an
option(?). I presume that, in the longer term, you would intend to support a
segmented line roi, so perhaps you would again be kind enough to make this
minor adjustment to your priorities. :-)

Regards and thanks,
Greg
--
Greg Joss,
Department of Biological Sciences, Phone: (61)(2) 9850 8212 Fax: 9850 8245
Macquarie University,              Email: [log in to unmask]
North Ryde, (Sydney,) NSW 2109, Australia

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