On Sep 6, 2012, at 15:03, Alex Cummins wrote:
> I would like to draw a freeform line. Then add 1mm tic marks. And then straighten that line or reform it as needed without distorting the line length or tic marks.
> Is this something I can easily do?
>
> Alex
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Hi Alex,
assuming that 'straighten the line' means straightening the image along the line, as shown in
http://rsb.info.nih.gov/ij/docs/guide/146-27.html#sub:Straighten...
It's easier if you first straighten the line and then add the tick marks.
- Draw the line (right-cklick the line tool and select 'Freehand line')
- Double-click the line tool, set a large width, and 'Spline Fit'
- Edit>Selection>Straighten
For the tick marks, you can write a short macro, something along this line (assumes you have a scaled image with mm units):
//creates a non-destructive overlay with the ticks
getPixelSize(unit, pixelWidth, pixelHeight);
firstTickPosition = 0.5; // in mm from left side of image
tickLength = 5; //pixels
tickPosFromTop = 10; //pixels
nTicks = 5;
for (i=0; i< nTicks; i++) {
x = (i+ firstTickPosition)/pixelWidth;
makeLine(x, tickPosFromTop, x, tickPosFromTop+ tickLength);
run("Add Selection...", "stroke=black width=3");
}
Michael
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