[NTG-context] drop shadows with metapost/ metafun

Henning Hraban Ramm texml at fiee.net
Sat Jan 2 11:38:14 CET 2021



> Am 29.12.2020 um 22:56 schrieb Garulfo <garulfo at azules.eu>:
> 
> Which process would you advice to add « drop shadows » to any kind of metafun / metapost figures like:
> picture p;
> p := textext("MetaPost is fun!") shifted (10cm,10cm);
> 
> 
> My current understanding of the required steps :
> 
> 
> 1- fill p with the shadow color
> 
> 2- write it to an external metapost file (with savebuffer ?) ready for png export (outputformat := "png »;)
> 
> 3- with lua, os.execute, and imagemagick prepare the shadow
>   - extent the png file with a transparent background, to have room for blurring 
>   - blur it
> 
> 4- import this png in context / Metapost (externalfigure), and center it with p figure
> 
> 5- shift it according to the desired shadows distance and angle
> 
> 6- apply the initial bounding box of p to the shadow, draw the shadow, draw the p picture 
> 
> 
> Actually, all this seems long and tedious, and contrasts with the already existing links between MetaPost / MetaFun and cairo + libpng.

I don’t know if that helps, but I’m using a stack of transparent objects to simulate drop shadows:
https://wiki.contextgarden.net/Drop_shadows

No pixel images required. But I’d like to have a real text shadow instead of that box shadow.


Happy New Year!
Hraban


More information about the ntg-context mailing list