Re: help drawing a polygon using drawPolygon

[Nicholas Jankowski]

fyi i uploaded a patch added some clarifying text on input format to
the function documentation
https://savannah.gnu.org/bugs/index.php?50370

On Tue, Feb 21, 2017 at 9:34 AM, James Sherman Jr. <address@hidden> wrote:
> On Tue, Feb 21, 2017 at 7:47 AM, Anthony Andriano
> <address@hidden> wrote:
>> Hello,
>>
>> I've been looking at the documentation for a while and I can't figure out
>> what I'm doing wrong. There doesn't seem to be an example to help guide a
>> beginner in this process and the terms aren't exactly clear.
>>
>> I'm trying to draw a triangle with the coordinates (-1, -2), (0, -2), and
>> (1, -2). The documentation for drawPolygon suggests it can take a list of
>> coordinates or some type of array, but I can't find any examples or
>> explanations for how the data should be entered and nothing I've tried has
>> worked.
>>
>> drawPolygon(COORD) - what does it mean to 'pack' coords into a single array?
>> How does one accomplish this?
>>
>> drawPolygon(PX, PY) - how do you specify the coordinates in different
>> arrays? I tried passing in [-1 -2], [0 2], [1 -2] as well as [-1; -2], [0;
>> 2], [1; -2] to no avail.
>>
>> drawPolygon(POLYS) - I looked up cell arrays, but none of the notation I've
>> tried has worked here.
>>
>> My goal is to draw a triangle at the given coordinates and then draw it
>> again on the same plot using a different color after applying a linear
>> transformation to rotate it. Any help or guidance anyone can offer would be
>> greatly appreciated.
>>
>> Thanks,
>> Tony
>>
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>>
>
> Hi Anthony,
>
> I can't check right now, but my guess is, for the second way to call
> drawPolygon, PX stands for the x coordinates of your polygon, and PY
> stands for the y coordinates of the polygon, so, try something like:
> PX = [-1 0 1];
> PY = [-2 2 -2];
> drawPolygon(PX, PY);
>
> Hope this helps.
>
> James Sherman
>
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