Re: [Maxima-discuss] explit plotting in wxdraw2d

[Gunter K. <gu...@pe...>]

I always use parametric() for this purpose:

wxdraw2d(parametric(5,y,y,0,10));

Am 13. Februar 2017 22:09:10 MEZ schrieb Eric Barth <ej...@gm...>:
>Here's another way that may or may not be simpler than your polygon
>
>wxdraw2d(points_joined=true,point_type=0, line_width=3,
>    points([[1,1],[1,4]]),
>    xrange=[-2,2],yrange=[0,5]);
>
>Eric
>
>On Mon, Feb 13, 2017 at 3:52 PM Evan Cooch <eva...@gm...>
>wrote:
>
>> For a variety of reasons, I need to be able to plot a vertical line,
>wrt
>> to the horizontal axis, in a plot. For the life of me, I'm not sure
>how
>> to do this using wxdraw2d (or if its even possible). Suppose I want a
>> simply x-y plot, with a horizontal line at y=200 over all x, and a
>> vertical line at x=100 over all y.
>>
>> First, I call a few things, and set some defaults:
>>
>> load("draw")$
>>
>> set_draw_defaults(
>>        grid=true,
>>        xaxis = true, yaxis = true,
>>          xaxis_type = solid, yaxis_type = solid,
>>        proportional_axes=xy)$
>>
>> wxplot_size: [250, 250] $
>>
>> wxdraw2d(x_voxel = 100,
>>     y_voxel = 100,
>>     line_width=2,color="black",
>>     explicit(200,x,0,250), /* horizontal line */
>>     explicit(100,y,0,250)); /* vertical */;
>>
>>
>> But, this doesn't work. It seems that explicit within wxdraw2d must
>be a
>> function in x.If thats the case, then how the heck would you ever
>draw
>> something like...x=100 over all y? In other words, a vertical
>reference
>> line? The only way I could 'get something to work' seems like a
>kludge
>> -- using polygon:
>>
>> wxdraw2d(
>>     line_width=2,color="black",
>>     explicit(200,x,0,250), /* horizontal line */
>>     polygon([100,100],[0,250])); /* vertical */;
>>
>> Does the trick but...is there a better way that I'm missing?
>>
>> Thanks!
>>
>>
>>
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