Sure. you may include it if you want. -JJ
On Sat, Aug 23, 2008 at 12:10 AM, Jason Grout <[EMAIL PROTECTED]> wrote: > Jae-Joon Lee wrote: >> Hi Jason, >> >> I did made a similar class sometime ago and I'm attaching it just in >> case. I guess it is very similar to yours but I rely on >> matplolib.patches.FancyArrow class to draw the arrow head. >> >> The circle drawn by scatter() command should be a circle with size s >> (the third argument of the scatter command) in points . It seems that >> it is implemented as a unit circle centered at (0,0) with a transform >> corresponding to the size s (and offset). So you may try something >> like below to calculate the size of the circle in data coord. >> >> ax = gca() >> p = scatter([0],[0], 500.) >> tr = p.get_transforms()[0] + ax.transData.inverted() >> x1, y1 = tr.transform_point([0,0]) >> x2, y2 = tr.transform_point([1,0]) >> r = abs(x2 - x1) >> >> p is a collection object and p.get_transforms() is a list of transforms. >> Note that a circle in the canvas coordinate(?) can be an ellipse in >> data coordinates. So, I guess you'd better do things in the canvas >> coordinates. >> >> For shortening your path, if you're only concerned with a straight >> line, it should be straight forward. But I guess it would a bit tricky >> to do this for general bezier curves (as in the example that Alan >> linked). I think (but I may be wrong) there is no universal algorithm >> to find the "all" intersecting points of two bezier curves. There may >> be one for between a bezier curve and a circle. And in this case where >> one point is inside the circle and the other is outside, one simple >> way I can think of is to recursively bisect the bezier curve (similar >> to the bisect root finding). > > Jae-Joon, > > Thank you very much. I am just finishing implementing a working version > of what I wanted in my ArrowLine class; it now shortens itself by a > certain number of points (assuming a line, just using a scale > transformation). However, I use paths for drawing the arrowhead where > you use patches. I think I like the flexibility your approach offers. > Do you mind if I include your code in the GPL-licensed Sage, and extend > it to do this shortening thing that I need? I still haven't decided > which is ultimately better for what I need (my class or your class), but > if you're willing to license your class in a compatible way, that > provides a choice. > > Thanks, > > Jason > > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
