http://blog.thecybershadow.net/2014/03/21/functional-image-processing-in-d/

Some highlights from a recent overhaul of the graphics package from my D library. It makes use of a number of D-specific language features, so I've tried to make the article accessible to people new to D as well.

Very interesting! Do you know http://www.antigrain.com/ ?

It is (was?) a very efficent c++ 2d library, heavily based on templates. Something like this in D with templates and lazy ranges should be impressive.


On Friday, 21 March 2014 at 11:04:58 UTC, Vladimir Panteleev wrote:
> http://blog.thecybershadow.net/2014/03/21/functional-image-processing-in-d/
>
> Some highlights from a recent overhaul of the graphics package from my D library. It makes use of a number of D-specific language features, so I've tried to make the article accessible to people new to D as well.

On Friday, 21 March 2014 at 11:04:58 UTC, Vladimir Panteleev wrote:
> http://blog.thecybershadow.net/2014/03/21/functional-image-processing-in-d/
>
> Some highlights from a recent overhaul of the graphics package from my D library. It makes use of a number of D-specific language features, so I've tried to make the article accessible to people new to D as well.

Are you planning on adding a font rasterizer and can it work at CTFE?
If it does both I have some neat ideas for exporting of UML diagrams.

Wow, great stuff here. If anybody else asks me "What is D good
for?" again I'll point them to this.

Atila

On Friday, 21 March 2014 at 11:04:58 UTC, Vladimir Panteleev
wrote:
> http://blog.thecybershadow.net/2014/03/21/functional-image-processing-in-d/
>
> Some highlights from a recent overhaul of the graphics package from my D library. It makes use of a number of D-specific language features, so I've tried to make the article accessible to people new to D as well.

On Friday, 21 March 2014 at 12:27:57 UTC, Rikki Cattermole wrote:
> On Friday, 21 March 2014 at 11:04:58 UTC, Vladimir Panteleev wrote:
>> http://blog.thecybershadow.net/2014/03/21/functional-image-processing-in-d/
>>
>> Some highlights from a recent overhaul of the graphics package from my D library. It makes use of a number of D-specific language features, so I've tried to make the article accessible to people new to D as well.
>
> Are you planning on adding a font rasterizer

Parsing vector font files is a big undertaking. I'd likely use a text rendering library, such as FreeType. Hardcoding a small bitmap font for ASCII only is also a possibility.

> and can it work at CTFE?

This program almost works:

string drawSmiley()
{
	import std.range;
	import std.math;

	import ae.utils.graphics.draw;
	import ae.utils.graphics.image;

	auto smiley = Image!char(20, 20);
	smiley.fill(' ');
	smiley.fillCircle(10, 10, 10, '#');
	smiley.fillCircle( 6, 6, 2, ' ');
	smiley.fillCircle(14, 6, 2, ' ');
	smiley.fillSector(10, 10, 6, 8, 0, PI, ' ');

	return smiley.h.iota.map!(y => smiley.scanline(y)).join("\n").idup;
}

pragma(msg, drawSmiley);

"almost" because fillSector calls atan2, which doesn't work in CTFE. :(

(And yeah, I totally did just declare an image with a colorspace of "char".)

Vladimir Panteleev:

> http://blog.thecybershadow.net/2014/03/21/functional-image-processing-in-d/

It looks nice. I suggest to not pack too much the code of the examples, so I suggest to put spaces around operators, etc.

It can be useful to add some benchmarks to compare its performance to equivalent regular foreach-based processing code in C/D.

Bye,
bearophile

On Friday, 21 March 2014 at 11:04:58 UTC, Vladimir Panteleev wrote:
> http://blog.thecybershadow.net/2014/03/21/functional-image-processing-in-d/
>
> Some highlights from a recent overhaul of the graphics package from my D library. It makes use of a number of D-specific language features, so I've tried to make the article accessible to people new to D as well.

This is great work and much needed.

On Friday, 21 March 2014 at 11:04:58 UTC, Vladimir Panteleev wrote:
> http://blog.thecybershadow.net/2014/03/21/functional-image-processing-in-d/
>
> Some highlights from a recent overhaul of the graphics package from my D library. It makes use of a number of D-specific language features, so I've tried to make the article accessible to people new to D as well.

That's awesome. When I see examples of some of the amazing stuff you can do with D, I wonder if D is the new Lisp. Hugely under-appreciated and immensely powerful. Now if we can just correct the former...

On 3/21/14, 4:04 AM, Vladimir Panteleev wrote:
> http://blog.thecybershadow.net/2014/03/21/functional-image-processing-in-d/
>
> Some highlights from a recent overhaul of the graphics package from my D
> library. It makes use of a number of D-specific language features, so
> I've tried to make the article accessible to people new to D as well.

Great piece. Vote up!!

http://www.reddit.com/r/programming/comments/2101ti/functional_image_processing_in_d/

https://news.ycombinator.com/newest (find the article on the page then vote)

https://www.facebook.com/dlang.org/posts/10202167415040354?stream_ref=10

https://twitter.com/D_Programming/status/447030249914519552


Andrei

Andrei Alexandrescu:

> http://www.reddit.com/r/programming/comments/2101ti/functional_image_processing_in_d/

But I have suggested some improvements of the article :-(

Bye,
bearophile