No, absolute measures are always left-to-right, top-to-bottom.
On Thursday, March 12, 2015 at 2:13:57 AM UTC-7, nanaya tachibana wrote:
>
> Thank you very much.
> Can anything affect the orientation of the absolute measurement of
> Measure? It goes from left-to-right and top-to-bottom, no matter how I set
> the units in the context.
>
> On Thursday, March 12, 2015 at 3:14:28 PM UTC+8, Daniel Jones wrote:
>>
>>
>> It can actually actually work both ways: cx and cy give "context units",
>> which by default are between 0 and 1, and go from left-to-right and
>> top-to-bottom, but can be redefined to be anything.
>>
>> So, this draws a line from the top-left to the bottom-right.
>> compose(context(), line([(0cx,0cy), (1cx,1cy)]), stroke("black"))
>>
>> But I can change the units in the context, it draws a line from the
>> bottom-left to top-right.
>> compose(context(units=UnitBox(0,1,1,-1)), line([(0cx,0cy), (1cx,1cy)]),
>> stroke("black"))
>>
>> UnitBox defines a new coordinate system in which the top-left corner is
>> (0, 1), and the context is 1 unit wide and 1 unit tall, but the height is
>> given as "-1", which somewhat unintuitively flips the orientation of the
>> units.
>>
>> If you look at the bottom of "coord.jl" in Gadfly, you'll see how the
>> coordinate system for the plot gets set up:
>>
>> context(units=UnitBox(
>> coord.xflip ? xmax : xmin,
>> coord.yflip ? ymin : ymax,
>> coord.xflip ? -width : width,
>> coord.yflip ? height : -height,
>> leftpad=xpadding,
>> rightpad=xpadding,
>> toppad=ypadding,
>> bottompad=ypadding),
>>
>>
>>
>>
>>
>>
>> On Wednesday, March 11, 2015 at 10:33:35 PM UTC-7, nanaya tachibana wrote:
>>>
>>> I wanted to contribute to Gadfly.jl and I started from looking into
>>> bar.jl.
>>> I found that the value cy of Measure in Gadfly.jl increases from bottom
>>> to top, but it increases from top to bottom in Compose.jl.
>>> What makes Measure work in that way?
>>>
>>> I really appreciate any help you can provide.
>>>
>>>
