> You could use a "CustomCanvas" and override the "public void
> paint(Graphics g)" to fill in your overlay. This would allow you to
> non-destructively layer one set of data on top of another. e.g.:
> <code>
> //a custom canvas to apply a non-destructive graphic overlay to image
> display
> CustomCanvas(ImagePlus imp) {
> super(imp);
> }//~ctor
>
> public void paint(Graphics g) {
> super.paint(g);
> drawOverlay(g);
> }//~cc paint
>
> void drawOverlay(Graphics g) {
> //draw the graphic overlay (non-destructively) showing user's selected
> points.
> g.setColor(Color.blue);
> if(pending) {//draw crosshair for current
> location
> g.drawLine(screenX((int)cl_x-2),
> screenY((int)cl_y), screenX((int)cl_x+2), screenY((int)cl_y));
> g.drawLine(screenX((int)cl_x),
> screenY((int)cl_y-2), screenX((int)cl_x), screenY((int)cl_y+2));
> }
> if(n_pts>0) {//draw crosshair cursors over
> previously selected locations
> int i,lx,ly;
> for(i=0;i<n_pts;i++) {
> if(i<3)
>
> g.setColor(Color.green);//our transform defining points
> else
>
> g.setColor(Color.yellow);//the rest of them
>
> lx=(int)((mPointDouble)mPoints.elementAt(i)).getX();
>
> ly=(int)((mPointDouble)mPoints.elementAt(i)).getY();
> g.drawLine(screenX(lx-2),
> screenY(ly), screenX(lx+2), screenY(ly));
> g.drawLine(screenX(lx),
> screenY(ly-2), screenX(lx), screenY(ly+2));
> }
> }
> }//~cc drawOverlay
>
> }//~ custom canvas class
> </code>
>
> Another option would be to just create a new image, as a composite of
> your data sets.
>
> -Gabriel
>
> -----Original Message-----
> From: ImageJ Interest Group [mailto:
[hidden email]]On Behalf Of
> Johannes Schindelin
> Sent: Thursday, November 02, 2006 10:40 AM
> To:
[hidden email]
> Subject: Re: Image J - overlay
>
>
> Hi,
>
> On Thu, 2 Nov 2006, O'Brien.Joseph wrote:
>
> > It's a cold afternoon here in the UK [...]
>
> Funny, I was in Scotland until Tuesday, and it was warmer than here in
> Germany!
>
> > The question is.......Can imageJ perform an 'overlay' function?
>
> You might want to copy the image to be overlayed, and play with
> "Edit/Paste Control..." I got what I wanted with "Max".
>
> Hth,
> Dscho
>
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