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Gerardo,

I think the approach used in this code should do what you want. Dorry I 
don't have time for more explanation...

-Chris


Gerardo Rivera wrote:
> Hi,
> 
> I'm trying to draw a line given an angle, magnitude, x0 and y0 
> location on a 2d line plot.  I use the "cosine" and "sine" to find 
> the x1 and y1 locations so that I can draw a line segment from x0, y0 
> to x1, y1.  This works fine on a 200 x 200 (Width x Height) pixel 
> graph.   However, I have an input form where the user can change the 
> plot size, for example 200x800 or 800x200.
> 
> The "magnitude" is along the y-axis and "time" is along the x-axis. 
> At a particular point in time the magnitude and angle is given and I 
> have to calculate the x1 and y1 values.  The max magnitude along the 
> y-axis (height) is always the same whether it is 200 pixels in height 
> or 800 pixels in height.
> 
> The scientist I'm working with wants to see the magnitude (x1,y1) of 
> each plot look correct if the graph is 800 pixels or 200 pixels in 
> height.   He also wants the correct angle if you stretch the graph 
> from 200 pixels wide to 800 pixels wide and then down to 100 pixels 
> wide.
> 
> I've been trying to use a ratio of the graph size to maintain the 
> correct sizing but with no luck.   Basically, the scientist want to 
> maintain the same angle and reduce or increase the magnitude in the 
> y-axis if the graph height is reduced or increased.
> 
> Does anyone have an answer to this solution?  Maintaining the same 
> angle and varying the magnitude based on the y-axis height.
> 
> Since, I have a lot of points I started to use a LineCollection to 
> speed the rendering speed.
> 
> Gerardo
> 
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Chr...@no...

Hi,

I have different questions to use tex with matplotlib.

The first one:

If I'm doing:

rc('text', usetex=True)
xlabel('$\textrm{toto}$')  # bad
xlabel(r'$\textrm{toto}$') # ok

The results are not the same and I don't understand why.

and for:

xlabel('$\textit{toto}$')  #bad
xlabel(r'$\textit{toto}$') #ok

same things, but it's working fine for:

xlabel('$\it{toto}$') #ok
xlabel(r'$\it{toto}$') #ok

but it's not working for \bf:

xlabel('$\textbf{toto}$')  # bad
xlabel(r'$\textbf{toto}$') # ok
xlabel('$\bf{toto}$')        # bad
xlabel(r'$\bf{toto}$')       # ok

And this bring to the second question, I would like to create the xlabel with 
latex stuf inside somewhere in my script:

label='$\textrm{test}_2$'

but that can't work:

xlabel(label) # bad

How to tell that I want the "r" before the chains to have TeX working like 
expected?

Thanks,

N.

Hi,

I'm trying to draw a line given an angle, magnitude, x0 and y0 
location on a 2d line plot.  I use the "cosine" and "sine" to find 
the x1 and y1 locations so that I can draw a line segment from x0, y0 
to x1, y1.  This works fine on a 200 x 200 (Width x Height) pixel 
graph.   However, I have an input form where the user can change the 
plot size, for example 200x800 or 800x200.

The "magnitude" is along the y-axis and "time" is along the x-axis. 
At a particular point in time the magnitude and angle is given and I 
have to calculate the x1 and y1 values.  The max magnitude along the 
y-axis (height) is always the same whether it is 200 pixels in height 
or 800 pixels in height.

The scientist I'm working with wants to see the magnitude (x1,y1) of 
each plot look correct if the graph is 800 pixels or 200 pixels in 
height.   He also wants the correct angle if you stretch the graph 
from 200 pixels wide to 800 pixels wide and then down to 100 pixels 
wide.

I've been trying to use a ratio of the graph size to maintain the 
correct sizing but with no luck.   Basically, the scientist want to 
maintain the same angle and reduce or increase the magnitude in the 
y-axis if the graph height is reduced or increased.

Does anyone have an answer to this solution?  Maintaining the same 
angle and varying the magnitude based on the y-axis height.

Since, I have a lot of points I started to use a LineCollection to 
speed the rendering speed.

Gerardo