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Question: Angled textplot. Can angle be scaled with plot display?

Question:Angled textplot. Can angle be scaled with plot display?

Ronan 1267 Maple 2024
textplot constrained plotting rotation
October 15 2024
2

I have angled some test to be parallel to the slope of a line. It tuns out that the text is only parallel if scaling = constrained is used. That is not necasserily pratical for many plots. In prcttice I have a nice proedure for this. Is there any way to pickup the plot x-y scaling factor that maple decides on so I could built that into the procedure. I have manually rescaled her to demonstrate.

mmm...I see the website viewer does not rotate the text.

> 

restart
> 

with(plots):
> 

P1:=[1,2]:P2:=[5/2,3]:
> 

vec:=P2-P1

[3/2, 1]

 (1)
> 

ang:=arctan(vec[2],vec[1])

arctan(2/3)

 (2)
> 

plt1:=textplot([((P1+P2+[.2,.2])/2)[],"parallel piece of text",rotation=ang]):
> 

plt2:=plottools:-line(P1,P2):
> 

display(plt1,plt2)

 
> 

display(plt1,plt2,scaling=constrained)

 
> 

#scaling factor looks to be 1.5 i.e.delta(x)/delta(y) (2.5-1)/{3/2)
> 

ang1:=arctan(1.5*vec[2],vec[1])

.7853981634

 (3)
> 

plt3:=textplot([((P1+P2+[.2,.2])/2)[],"parallel piece of text",rotation=ang1]):
> 

display(plt3,plt2)

 
 

 

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