

border points Blaz from Slovenia [6 posts] 
12 years

Hi!
I have a little problem... I am trying to find min_x and max_x value on a speciefied Y (for example COG_Y). I uploaded a picture where is drawn a red line between two points which are the global max_x and global min_x.
I would like to know the lokal max_x and lokal min_x.
In other words max_x and min_x
on y=COG_Y and draw the line between them.
Any suggestions?
bye
Blaz



Anonymous 
12 years

Blaz,
Yes, you can use the edge probe to look along the Y line for the edges of the object. See the robofile below for a quick example using a test image.
Note that the trick is to use the [variable] expression in the edge probe GUI instead of a static number. This allows for dynamic configuration of GUI interfaces.
STeven. program.robo



Blaz from Slovenia [6 posts] 
12 years

Thanks STeven!
Edge probe is the right thing. But I have an another problem... When you do the Edge Probe an you find two edges points. The position xy (of the points) is writen in an array PROBED_EDGES. I would like to use this values in some equations.
I tried this way, but is not the right way because I can not get the variables I need.
Dim point
ReDim point(2,2)
point(2,2) = GetArrayVariable("PROBED_EDGES")
x1=point(0,0)
y1=point(0,1)
x2=point(1,0)
y2=point(1,1)
SetVariable "Y1", y1
SetVariable "Y2", y2
The resoult is 0 for both...
Any Ideas?
Thank you in advance
Blaz



Blaz from Slovenia [6 posts] 
12 years

Just a correction:
The result is not 0 is nothing (is empty)!
Blaz



Anonymous 
12 years

Blaz,
In your case try
points = GetArrayVariable("PROBED_EDGES")
x1=point(0)
y1=point(1)
x2=point(2)
y2=point(3)
SetVariable "Y1", y1
SetVariable "Y2", y2
or if you plan to use those values in other modules where typically one types in just a number for a shorthand try
[PROBED_EDGES:0] for the first element
[PROBED_EDGES:1] for the second, etc.
instead of the number that you would normally type in. The [] tell the module that it is a variable and an expression to be evalulated before the
actual number is used. So you can also use
[PROBED_EDGES:0+5]
if you'd like.
STeven.



Blaz from Slovenia [6 posts] 
12 years

Thank you STeven!!!
I have tried this way before, but I made a stupid mistake....
I wrote points (with s) = GetArrayVariable("PROBED_EDGES")
and then
x1 = point (without s) (0) ....
And then I tought that is a problem of dimensions, etc..
OK Thank you for everthing!
bye
Blaz

