On Tue, Nov 9, 2010 at 8:44 PM, Jae-Joon Lee <lee.j.j...@gmail.com> wrote:
> On Wed, Nov 10, 2010 at 1:01 AM, Jason Grout
> <jason-s...@creativetrax.com> wrote:
> > Is the tip of the arrow (after the miter join) supposed to hit (1,1), or
> is
> > the center of the line supposed to hit (1,1)? Or maybe the tip of the
> > joinstyle='round' arrow (the default) is supposed to hit (1,1)?
> >
>
> The tip of the arrow is meant to hit (1,1), which is done by the
> underlying arrow class adjusting the end point of the path during the
> drawing time. This only happens for arrowstyle "->" and etc.
> However, there was an incorrect arithmetic which I think is fixed now.
> The patch is attached (it also fixes dpi-related issues).
> I'm not sure it would be better if this could be optionally turned
> off. Any suggestion?
> Let me know of any (persisting or other) issues.
>
> FYI, path is shortened by small amount by default. This is controlled
> by *shrink* parameter (shrinkA and shrinkB shortens the line begin and
> the line end respectively.)
>
>
> aa = ax.annotate('', (1,1), (0,0),
> arrowprops=dict(arrowstyle="-|>",
> fc="k", ec="k",lw=50,
> shrinkB=0,
> path_effects=[Stroke(joinstyle='miter')]
> )
>
> Also, I noticed that the arrow head is not correctly filled when
> path_effects are in use. This is now fixed.
>
> Regards,
>
> -JJ
>
I just seem to break things...
I am not 100% sure if the tip is placed correctly, but it does appear much
better than before. I now see a tiny bit of the red line southwest of the
vertex. Before, the issue was that the arrow tip was northeast of the
vertex. In addition, I found that I was still able to produce the
distortion after zooming in sufficiently (it took a few extra zooms to make
it happen).
I then did one more zoom, and then tried resizing the window, and I think I
broke the Agg renderer. Two exceptions were raised. First, an overflow
error occurred while rendering the path (complexity exceeded). Then, an
"SystemError: error return without exception set" exception was raised from
the same spot. I am wondering if zooming into the arrow distortion and/or
resizing the figure window triggered the complexity issue, and then the
error handling routines weren't properly handling the raised exception.
Here was my traceback:
Traceback (most recent call last):
File
"/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/backends/backend_gtk.py",
line 394, in expose_event
self._render_figure(self._pixmap, w, h)
File
"/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/backends/backend_gtkagg.py",
line 75, in _render_figure
FigureCanvasAgg.draw(self)
File
"/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/backends/backend_agg.py",
line 394, in draw
self.figure.draw(self.renderer)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/artist.py",
line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/figure.py",
line 874, in draw
func(*args)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/artist.py",
line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/axes.py",
line 1954, in draw
a.draw(renderer)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/artist.py",
line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/text.py",
line 1986, in draw
self.arrow_patch.draw(renderer)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/patches.py",
line 3930, in draw
path_effect.draw_path(renderer, gc, p, affine, None)
File
"/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/patheffects.py",
line 121, in draw_path
renderer.draw_path(gc0, tpath, affine, None)
File
"/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/backends/backend_agg.py",
line 117, in draw_path
self._renderer.draw_path(gc, path, transform, rgbFace)
OverflowError: Agg rendering complexity exceeded. Consider downsampling or
decimating your data.
Traceback (most recent call last):
File
"/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/backends/backend_gtk.py",
line 394, in expose_event
self._render_figure(self._pixmap, w, h)
File
"/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/backends/backend_gtkagg.py",
line 75, in _render_figure
FigureCanvasAgg.draw(self)
File
"/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/backends/backend_agg.py",
line 394, in draw
self.figure.draw(self.renderer)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/artist.py",
line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/figure.py",
line 814, in draw
if self.frameon: self.patch.draw(renderer)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/artist.py",
line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/patches.py",
line 411, in draw
renderer.draw_path(gc, tpath, affine, rgbFace)
File
"/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/backends/backend_agg.py",
line 117, in draw_path
self._renderer.draw_path(gc, path, transform, rgbFace)
SystemError: error return without exception set
------------------------------------------------------------------------------
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