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Hi good people of StackExchange, I want to draw a colored tile using Tikz. Roughly to represent the percentage three kind of things have in comparison to their total. The picture I want can be produced using the following.

usepackagetikz

newcommandcolorTiles[1]
 begintikzpicture
 draw[ultra thick](0,0) rectangle (1,0.5);
 draw[fill = red](0, 0) rectangle (0.3, 0.5);
 draw[fill = green](0.3, 0) rectangle (0.7, 0.5);
 draw[fill = purple](0.7, 0) rectangle(1, 0.5);
 endtikzpicture
 

colorTiles

Now my question is, how can I define the new command so that I don't have to adjust the proportions every time? Ideally, I just need to use

colorTile0.3, 0.5, 0.2

And I should get a tile with 30% red, 50% green, and 20% purple. I'm not familiar with Tikz so please help me.

Thanks in advance!

Welcome to TeX-SE! The following produces such bars. The syntax is as simple as

piccolor tile=0.3, 0.5, 0.2;

The colors are stored in a list and can be adjusted, as illustrated in the following example. The width is stored in a pgf key and can also be adjusted.

documentclass[tikz,border=3.14mm]standalone
begindocument
begintikzpicture[pics/color tile/.style=code=
 path (0,0) coordinate (aux);
 foreach XX [count=YY starting from 0] in #1 
 pgfmathsetmacromycolLstCols[YY]
 draw[line width=pgfkeysvalueof/tikz/color tile/width,color=mycol]
 (aux) -- ++(XX,0) coordinate (aux);
 draw[thick] (0,-pgfkeysvalueof/tikz/color tile/width/2) rectangle
 (aux,color tile/.cd,width/.initial=5mm]
 edefLstCols"red","green","purple","blue" %< adjust and extent if needed
 path piccolor tile=0.3, 0.5, 0.2 (3,0) piccolor tile=0.3,0.6,0.4, 0.5;
 edefLstCols"orange","purple","yellow","red","blue" %< adjusted and extended list
 path (1,-2) piccolor tile=0.3,0.6,0.4, 0.5,0.8;
 tikzsetcolor tile/width=1cm
 path (1,-4) piccolor tile=0.3,0.6,0.4, 0.5,0.8;
endtikzpicture
enddocument

As for your comment on a command: here is a proposal.

documentclassarticle
usepackagetikz
tikzsetpics/color tile/.style=code=
 edefLstColspgfkeysvalueof/tikz/color tile/colors
 path (0,0) coordinate (aux);
 foreach XX [count=YY starting from 0] in #1 
 pgfmathsetmacromycolLstCols[YY]
 draw[line width=pgfkeysvalueof/tikz/color tile/width,color=mycol]
 (aux) -- ++(XX,0) coordinate (aux);
 draw[thick] (0,-pgfkeysvalueof/tikz/color tile/width/2) rectangle
 (aux,color tile/.cd,width/.initial=1em,
 colors/.initial="red","green","purple","blue"
newcommandColorTile[2][]tikzpic[color tile/.cd,#1]color tile=#2; 
begindocument
begintabularll
ColorTile0.3, 0.5, 0.2 & ABC \
ColorTile0.1, 0.2, 0.7 & UVW \
ColorTile[colors="red","green","blue"]0.3, 0.5, 0.2 & XYZ\
endtabular
enddocument

Answering this just in case someone would need it:

newcommandcolorTiles[3]
 begintikzpicture
 draw[ultra thick](0,0) rectangle (2,0.5);
 draw[fill = red](0, 0) rectangle (#1 * 2, 0.5);
 draw[fill = green](#1 * 2, 0) rectangle (#2 * 2 + #1 * 2, 0.5);
 draw[fill = purple](#2 * 2 + #1 * 2, 0) rectangle(#3 * 2 + #2 * 2 + #1 * 2, 0.5);
 draw[fill = gray](#3 * 2 + #2 * 2 + #1 * 2, 0) rectangle(2, 0.5);
 endtikzpicture

Then we can put colorTiles0.20.50.1 inline.