Posted by
DeBarr, Gabriel on
URL: http://imagej.273.s1.nabble.com/Image-J-overlay-tp3701104p3701105.html
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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