Click on buttons and click on places to place lines/dots. Change the color with the RGB sliders. When you are finished and want to post this on AoPS, click "Show copy/paste data" and copy and paste it. The dot next to the RGB sliders shows a preview of the color.
***Tell me what to add*** ***This was mainly made for AoPS users (including myself, PiesAreSquared).*** Asymptote is a vector graphics language that can be used in posts on artofproblemsolving.com (AoPS). It is very complicated (it even has 3D support! :O), but if you just want to draw quick sketches, use this. I got the idea from @jji7skyline's project "MySVG". http://scratch.mit.edu/projects/2822414/ Credit to @JTxT for the RGB pen block. http://beta.scratch.mit.edu/projects/10071595
