On Mar 14, 2015, at 12:41 PM, rafesgre <
[hidden email]> wrote:
>
> Hi wayne.
>
> thank you very much for the macro!
> Just two questions:
> 1) When I use the macro, it's only possible to draw a line that is
> perpendicular to the last line in the list of the ROI manager. Even if I
> select another line in the ROI manager, the new line will always be
> perpendicular to the last line in the ROI manager.
> Is there a way to change this behaviour?
> 2) The newly created perpendicular line is always found at midlength of the
> "reference line" (= the previous line in the ROI manager). That is ok,
> because I can afterwards drag this line to the position where I would like
> to have it (however, I still have to modify it, because I also need a
> certain length). But is there also a possibility to draw the line that needs
> to be perpendicular (to the previous line) by starting from a point I choose
> and then attaching this line at 90° (i.e. perpendicular) to the previous
> line? So, to explain it another way:
> a) Start drawing the requested line from a a certain point
> b) Draw the line near to the previous line, to which it should be
> perpendicular
> c) The macro should now recognize that there's a "sticky" line to which
> our new line should be perpendicular to
> d) Complete the drawing of the line which should now be perpendicular to
> our "sticky" line and start from the point that we chose at a)
>
> Is it possible, to do something like that?
You can do this with a tool macro, similar to the attached L-Shape Tool macro by Jerome Mutterer, which I found by searching the mailing list archives. You may need to modify this macro to get it to work exactly the way you want. The macro is also available online at
http://imagej.nih.gov/ij/macros/tools/L-ShapeTool.txt// L-shape Tool
//
// This macro tool creates an L-shaped line selection.
// Click and drag the mouse to set the first segment.
// After the mouse button is released, drag to set the
// second segment and click to finish.
// Author: Jerome Mutterer
macro "L-Shape Tool -C000L1991L91e6" {
run("Line Width...", "line=1");
getPixelSize(unit, pixelWidth, pixelHeight);
getCursorLoc(x, y, z, flags);
xstart = x; ystart = y;
x2=x; y2=y;
while (flags!=0) {
getCursorLoc(x, y, z, flags);
if (x!=x2 || y!=y2)
makeLine(xstart, ystart, x, y);
x2=x; y2=y;
wait(10);
}
if (x!=xstart || y!=ystart) {
drawLshape(xstart, ystart, x, y);
}
}
function drawLshape(x1, y1, x2, y2) {
a = atan ((x2-x1)/(y2-y1));
x3=0;y3=0;
while (flags&16==0) {
getCursorLoc(x, y, z, flags);
if (x!=x3 || y!=y3) {
sign=1;
if (x2>x) sign=-1;
w=sqrt ((x2-x)*(x2-x)+(y2-y)*(y2-y));
wsa = sign*w*sin((PI/2)+a);
wca = sign*w*cos((PI/2)+a);
makeLine( x1,y1,x2,y2,x2 + wsa,y2 + wca);
x3=x;y3=y;
wait(10);
}
}
}
> --
> View this message in context:
http://imagej.1557.x6.nabble.com/Constructing-line-perpendicular-to-other-line-saved-in-ROI-manager-tp5011962p5011965.html> Sent from the ImageJ mailing list archive at Nabble.com.
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