Hi Luke and JLM,
I have the same issue! I set scatterItem.setGLOptions('translucent') with
alphas set to the max, 255. Is there some reason for this behavior?
BR,
Jamin Hu
On Tuesday, May 13, 2014 at 4:34:09 PM UTC+3 [email protected] wrote:
> Actually.... Another funny bug...
>
> When the points are fully opaque, the corners of the sprite are opaque as
> well (I'm assuming you colored them with the background color). This would
> be fine if points didn't overlap from a given view angle, but it looks a
> little funny when they do. Is there a way to make the corners transparent,
> and the circles opaque? I looked through GLScatterPlotItem.py and didn't
> see an obvious fix to me, but I have no openGL experience.
>
> Let me know what you think about this.. Screenshot is attached.
>
>
>
> On Tue, May 13, 2014 at 8:17 AM, Jeffery McGehee <[email protected]>
> wrote:
>
>> Sorry for the delayed response, I got busy on another project... Your
>> fix is giving me the results I wanted! I really appreciate the dedicated
>> support!
>>
>> I simply changed the code in my currently installed package rather than
>> pull down your branch and reinstall. Thanks a ton!
>>
>> Jeff
>>
>>
>> On Thu, May 8, 2014 at 9:39 PM, Luke Campagnola <[email protected]>
>> wrote:
>>
>>> On Thu, May 8, 2014 at 4:35 PM, Jeffery McGehee <[email protected]>
>>> wrote:
>>>
>>>> The datapoints are still translucent in 'translucent' mode. Even with
>>>> the alpha column of the RGBA matrix set to 1.0 . See attachment. If I try
>>>> low alpha values, it does make the points obviously more transparent. So
>>>> it's working to some extent. If I
>>>>
>>> try values larger than one, it looks the same as the image I have
>>>> attached, but it does not throw an exception.
>>>>
>>>
>>> Right you are! In opengl/items/GLScatterPlotItem.py ~line 62, I see:
>>>
>>> return 200 * (w/2. - np.clip(r, w/2.-1.0, w/2.))
>>>
>>> That constant should have been 255, not 200. I have pushed a fix to the
>>> develop branch.
>>> Thanks for the report!
>>>
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