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digitalmars.D.learn - Draw math formulas with ggplotd

reply brocolis <brocolis deb.null> writes:
How do I draw math formulas programmatically? I want to do on 
screen what latex does on .pdf.

And I want to draw a math formula in the image generated with 
ggplotd.
Sep 16 2016
next sibling parent reply Edwin van Leeuwen <edder tkwsping.nl> writes:
On Saturday, 17 September 2016 at 02:41:15 UTC, brocolis wrote:

 How do I draw math formulas programmatically? I want to do on 
 screen what latex does on .pdf.

 And I want to draw a math formula in the image generated with 
 ggplotd.


You can't at the moment. Parsing latex equations is not a trivial 
task.

One possible approach would be to convert part of the equations 
(greek alphabet etc.) to utf and use geomLabel to "simulate" 
sub/super script. One caveat with this is that I am not sure how 
well cairo(d) supports utf.
Sep 17 2016
parent Edwin van Leeuwen <edder tkwsping.nl> writes:
On Saturday, 17 September 2016 at 09:56:09 UTC, Edwin van Leeuwen 
wrote:

 On Saturday, 17 September 2016 at 02:41:15 UTC, brocolis wrote:

 How do I draw math formulas programmatically? I want to do on 
 screen what latex does on .pdf.

 And I want to draw a math formula in the image generated with 
 ggplotd.


 You can't at the moment. Parsing latex equations is not a 
 trivial task.


When I say you can't I meant that this is not explicitly 
supported by ggplotd.
Sep 17 2016
prev sibling parent reply John Colvin <john.loughran.colvin gmail.com> writes:
On Saturday, 17 September 2016 at 02:41:15 UTC, brocolis wrote:

 How do I draw math formulas programmatically? I want to do on 
 screen what latex does on .pdf.

 And I want to draw a math formula in the image generated with 
 ggplotd.


Generate data from those formulas (I like to do this with 
something like iota(0, 10, 0.05).map!(x => sqrt(x) / (1 + 
sin(x)^^2)) and then plot that.

If you want to use actual latex you would need a program to 
convert it to code. Mathematica can convert latex to C, which 
would then be easy to port to D.

Either way, if I remember correctly there is a simple line plot 
example in ggplotd's README.md
Sep 17 2016
parent reply Edwin van Leeuwen <edder tkwsping.nl> writes:
On Saturday, 17 September 2016 at 11:22:04 UTC, John Colvin wrote:

 On Saturday, 17 September 2016 at 02:41:15 UTC, brocolis wrote:

 How do I draw math formulas programmatically? I want to do on 
 screen what latex does on .pdf.

 And I want to draw a math formula in the image generated with 
 ggplotd.


 Generate data from those formulas (I like to do this with 
 something like iota(0, 10, 0.05).map!(x => sqrt(x) / (1 + 
 sin(x)^^2)) and then plot that.


For this part ggplotd does have a helper function:

http://blackedder.github.io/ggplotd/ggplotd/stat.html#statFunction

auto gg = statFunction(x => sqrt(x) / (1 +
   sin(x)^^2), 0.0, 10).geomLine().putIn(GGPlotD());

But I assumed he meant adding the formula onto the plot.
Sep 17 2016
next sibling parent reply John Colvin <john.loughran.colvin gmail.com> writes:
On Saturday, 17 September 2016 at 11:45:07 UTC, Edwin van Leeuwen 
wrote:

 On Saturday, 17 September 2016 at 11:22:04 UTC, John Colvin 
 wrote:

 On Saturday, 17 September 2016 at 02:41:15 UTC, brocolis wrote:

 How do I draw math formulas programmatically? I want to do on 
 screen what latex does on .pdf.

 And I want to draw a math formula in the image generated with 
 ggplotd.


 Generate data from those formulas (I like to do this with 
 something like iota(0, 10, 0.05).map!(x => sqrt(x) / (1 + 
 sin(x)^^2)) and then plot that.


 For this part ggplotd does have a helper function:

 http://blackedder.github.io/ggplotd/ggplotd/stat.html#statFunction

 auto gg = statFunction(x => sqrt(x) / (1 +
   sin(x)^^2), 0.0, 10).geomLine().putIn(GGPlotD());

 But I assumed he meant adding the formula onto the plot.


Hah, yes, I should have read the question better. Do you support 
embedding outside images? When I wanted nice mathematical 
notation generated quickly in D I have used pyd to call 
matplotlib's builtin math rendering (much quicker than a full 
latex roundtrip).
Sep 17 2016
parent reply Edwin van Leeuwen <edder tkwsping.nl> writes:
On Saturday, 17 September 2016 at 11:57:17 UTC, John Colvin wrote:

 On Saturday, 17 September 2016 at 11:45:07 UTC, Edwin van 
 Leeuwen wrote:

 But I assumed he meant adding the formula onto the plot.


 Hah, yes, I should have read the question better.


Rereading the question I am actually not sure which of us 
interpreted the question correctly :)


 Do you support embedding outside images? When I wanted nice 
 mathematical notation generated quickly in D I have used pyd to 
 call matplotlib's builtin math rendering (much quicker than a 
 full latex roundtrip).


You can draw onto any cairo surface, so this should be possible. 
You'd just need to figure out how to cast/convert a matplotlib 
image to a cairo image.
Sep 17 2016
parent John Colvin <john.loughran.colvin gmail.com> writes:
On Saturday, 17 September 2016 at 12:09:04 UTC, Edwin van Leeuwen 
wrote:

 On Saturday, 17 September 2016 at 11:57:17 UTC, John Colvin 
 wrote:

 On Saturday, 17 September 2016 at 11:45:07 UTC, Edwin van 
 Leeuwen wrote:

 But I assumed he meant adding the formula onto the plot.


 Hah, yes, I should have read the question better.


 Rereading the question I am actually not sure which of us 
 interpreted the question correctly :)


 Do you support embedding outside images? When I wanted nice 
 mathematical notation generated quickly in D I have used pyd 
 to call matplotlib's builtin math rendering (much quicker than 
 a full latex roundtrip).


 You can draw onto any cairo surface, so this should be 
 possible. You'd just need to figure out how to cast/convert a 
 matplotlib image to a cairo image.


You just get back an alpha mask as an array of arrays, so it 
should be straightforward from there. What would be useful would 
be integration with ggplotd so it could be placed appropriately. 
Would be even better if e.g. the user could specify a function to 
render text and ggplotd would call it with tick label strings etc.
Sep 17 2016
prev sibling parent brocolis <brocolis deb.null> writes:
On Saturday, 17 September 2016 at 11:45:07 UTC, Edwin van Leeuwen 
wrote:

 On Saturday, 17 September 2016 at 11:22:04 UTC, John Colvin 
 wrote:

 On Saturday, 17 September 2016 at 02:41:15 UTC, brocolis wrote:

 How do I draw math formulas programmatically? I want to do on 
 screen what latex does on .pdf.

 And I want to draw a math formula in the image generated with 
 ggplotd.


 Generate data from those formulas (I like to do this with 
 something like iota(0, 10, 0.05).map!(x => sqrt(x) / (1 + 
 sin(x)^^2)) and then plot that.


 For this part ggplotd does have a helper function:

 http://blackedder.github.io/ggplotd/ggplotd/stat.html#statFunction

 auto gg = statFunction(x => sqrt(x) / (1 +
   sin(x)^^2), 0.0, 10).geomLine().putIn(GGPlotD());

 But I assumed he meant adding the formula onto the plot.


Yes I want adding the formula onto the plot. Thanks.
Sep 18 2016