Custom Roundel 
This is a simple tool to create a Transport for London roundel with custom text in the middle, and a choice of colours.
Font Scaling
An interesting problem that presented itself when I was developing this was how to scale the custom SVG text because the text size did not scale linearly with character number.
To solve this, I plotted the character to visual width ratio for a selection of roundel images and calculated a polynomial trendline that fit the points. The more the characters input, the smaller the font would scale.
Future Features
- Custom colour input
- Save SVG to file