Draw with the mouse. Click the green flag to start over on a blank piece of paper. Click the settings button to show sliders to play around with. You can change the pen angle, switch nibs, and adjust the curve smoothness.
Calligraphy Pen + Smooth Pen = Smooth Calligraphy Pen! This is a mash-up of @PIGofDOOM's Calligraphy Pen and @PullJosh's Smooth Pen: https://scratch.mit.edu/projects/119313108/ I also discovered two old projects which are similar to this one, but I haven't looked at the code in them. "Calligraphy" by @novice27b: https://scratch.mit.edu/projects/26017745/ "Calligraphy Made Easy" by @RJ_12: https://scratch.mit.edu/projects/87159373/