This is a small demo project to implement simple vector drawing in Godot. It uses Line2D and CanvasGroup nodes. This demo also has an erase/undo tool and supports brush softness.

What's in it

Thanks to StarryAlley for original repo! The modifications I've made in my fork:

• Replaced Subviewport with a CanvasGroup node. It should reduce the number of draw calls
• Added "brush softness" i.e. a Gaussian blur shader applied to CanvasGroup
• Simplified the code a bit and added some buttons

Things to improve

• Add Line2D smoothing using Beziers
• Improve blur shader quality and/or efficiency
• Clean up some jankiness in input handling and undo_last() function
• Measure the maximum number of Line2D points Godot can handle (and come up with a caching solution if needed)
• Test and improve multiple brush softness support (I have a temporary solution in the project but I commented it out for now)