On Jan 13, 2016, at 2:58 PM, Tom <[email protected]> wrote:

Bryan,

Thanks for your reply.

The ideal would be to pass a function like 'y = x' or 'y = x**2' or what have you. y=x is the case I am concerned with right now but others are useful too. The big thing about plotting functions vs. plotting a line glyph is that the function redraws when you zoom and has an infinite range.

Could i do a User Defined Extension glyph for a function glyph? Does that even make sense. I don't know anything about User Defined Extensions.

On Wednesday, January 13, 2016 at 3:22:17 PM UTC-5, Bryan Van de ven wrote:

Tom,

> My premise was a 45 degree line should go through 1=1, 2=2, etc

I see. I can believe that something that behaves the way you describe would be useful, though I am not convinced that "Ray" should be made to behave differently. To me, any notion of "angle" has under it a notion of fixed aspect, and the only place where that can really be guaranteed is in screen space. Anything else would seem to open up lots of possibility for confusion.

So what I would have in mind is a new Annotation type that accepts two pairs of coordinates (each in data or screen space), that draws a line that extends "infinitely" through both those coordinates. It would actually be possible to make such an Annotation now as a User Defined Extension model, immediately. That could be a good way to prove out an implementation or API to later go in to the core library. So two things:

* can you make a GitHub issue to request this feature

* would you be interested in working up such a UDF extension (with some help)?

Thanks,

Bryan

> On Jan 13, 2016, at 1:22 PM, Tom <[email protected]> wrote:

>

>

>

> On Wednesday, January 13, 2016 at 2:21:46 PM UTC-5, Tom wrote:

> I'm using bokeh version 0.10

>

> When I plot something for which the screen and data coordinates are proportional I get the right results (see square.png) but when i plot something that is off square I get invalid results (see off square.png)

>

> square:

>

> from bokeh import plotting

> import numpy

> f = plotting.figure()

> f.scatter([1,2,3,4], [1.1,1.9,3.3,4])

> f.ray([0], [0], length=0, angle=numpy.pi/4)

>

> off square:

>

> from bokeh import plotting

> import numpy

> f = plotting.figure()

> f.scatter([1,2,3,4], [1.1,1.9,3.3,3.6])

> f.ray([0], [0], length=0, angle=numpy.pi/4)

>

> This made me think that it was actually 45 degrees in screen rather than data coordinates.

>

>

> --Tom

>

>

>

> On Wednesday, January 13, 2016 at 2:02:56 PM UTC-5, Bryan Van de ven wrote:

> Tom,

>

> I don't understand the comment about screen vs data units with respect to angles. Can you elaborate?

>

> Bryan

>

> > On Jan 13, 2016, at 12:56 PM, Tom <[email protected]> wrote:

> >

> > If I want an infinitely extending 45 degree line i'm guessing that 2 rays with length=0 and deg = 45, deg = -135 would do the trick but it looks like the degrees are for an angle in screen rather than data coordinates. Is there a way to get a 45 degree line in data coordinates?

> >

> > I know rect has a concept of height_units. Do I need to set something similar for ray to get it into data units.

> >

> > --Tom

> >

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