[Blindmath] Determining shape coordinates when using SVGDraw01

Sat Dec 24 15:20:16 UTC 2011

That would be a good program for you to write. <grin>

Seriously, that might be a useful program. Display a GUI with a list of
radio buttons where each radio button corresponds to a known shape. There
may also need to be parameters associated with each shape. Let the user
select a shape, enter the parameters, and click an OK button.

Have the program display the coordinate values in such a way that they
could be copied and pasted into the fields of SVGDraw.

Dick Baldwin

On Sat, Dec 24, 2011 at 12:18 AM, Pranav Lal <pranav.lal at gmail.com> wrote:

> Hi Richard,
>
> I hear you. In the interim, is there a way to generate shape coordinates
> assuming I know what shape I want to draw?
>
> Autocad does have download demos available so you may want to try them.
> <chuckle
>
> It is all GUI now but I am told that you can still draw using commands like
> line etc.
> Pranav
> -----Original Message-----
> From: blindmath-bounces at nfbnet.org [mailto:blindmath-bounces at nfbnet.org]
> On
> Behalf Of Richard Baldwin
> Sent: Saturday, December 24, 2011 9:25 AM
> To: Blind Math list for those interested in mathematics
> Subject: Re: [Blindmath] Determining shape coordinates when using SVGDraw01
>
> Hi Pranav and Ben,
>
> I imagine it would be fairly difficult, but I will give it some thought.
>
> I also haven't used Autocad since playing with a DOS version many years
> ago.
>
> Dick Baldwin
>
> On Fri, Dec 23, 2011 at 8:36 PM, Pranav Lal <pranav.lal at gmail.com> wrote:
>
> > Hi Ben,
> >
> > This is interesting.  I've never used any other CAD program though I had
> > tried a very old version of AutoCAD which was accessible during the DOS
> > days.  < Chuckle
> >
> > Richard, how easy would it be to add the features Ben mentions?  Would
> > other
> > users find these useful?
> >
> > Pranav
> >
> > -----Original Message-----
> > From: blindmath-bounces at nfbnet.org [mailto:blindmath-bounces at nfbnet.org]
> > On
> > Behalf Of Ben Humphreys
> > Sent: Saturday, December 24, 2011 2:10 AM
> > To: Blind Math list for those interested in mathematics
> > Subject: Re: [Blindmath] Determining shape coordinates when using
> SVGDraw01
> >
> > In a CAD program such as AutoCAD, there are two features that make
> > drawing these kinds of things much easier:
> >
> > 1.  One line segment or edge of an existing shape can "snap" to
> > another.  This is typically done by moving the mouse "close" to the
> > edge of a segment or shape and the "snap-to" is indicated visually
> > with a small pink rectangle if memory serves.
> >
> > 2.  In addition to drawing using pairs of x-y coordinates, polor
> > coordinates can be used as well.  So instead of saying something like:
> >
> > Line from 0, 0 to 3, 4 you could say:
> > Line from 0, 0  , length 5 at a 60 degree angle
> >
> > In such a system, the actual exact coordinates take a back seat yet
> > the length of lines and angles is very precise.  In order to
> > replicate the "snap-to" functionality present in a CAD program, SVG
> > Draw would need to allow naming of objects (which I think it already
> > does) and then the ability to specify a "point" on that object, such
> > as top, left, right, bottom, midpoint, intersection, etc
> >
> > In this way, you could assemble objects using lines that connect to
> > the ends of other lines or edges or midpoints of other objects
> > without regard to their coordinates.
> >
> > I suspect implementing some of this would represent a fair bit of
> > work, since we're talking features typically found in a CAD
> > program.  But the level of flexability would be improved marketdly I
> > believe.
> >
> > Ben
> >
> > At 08:45 AM 12/22/2011, you wrote:
> > >Hi all,
> > >
> > >I am trying to draw things like tables, chairs etc using SVGDraw01. One
> > >problem I have is that if I try to draw something like a rhombus, I need
> > to
> > >get the coordinates myself. My civil engineer dad draws the shape on
> paper
> > >and then gets the coordinates. However, in a program, I suspect I will
> > have
> > >to use a different approach since I cannot draw the shape and then
> derive
> > >the coordinates. What approach should this be? Do I need to use
> equations
> > of
> > >shapes or is this a simpler problem?
> > >
> > >Pranav
> > >
> > >
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> --
> Richard G. Baldwin (Dick Baldwin)
> Home of Baldwin's on-line Java Tutorials
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>
> Professor of Computer Information Technology
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-- 
Richard G. Baldwin (Dick Baldwin)
Home of Baldwin's on-line Java Tutorials
http://www.DickBaldwin.com

Professor of Computer Information Technology
Austin Community College
(512) 223-4758
mailto:Baldwin at DickBaldwin.com
http://www.austincc.edu/baldwin/