bevy_pen_tool

A Bevy Engine plugin for making 2D paths and smooth animations with Bezier curves

TODO:

• Mesh-making functionality for building 2D shapes and roads

Controls

Icon	Keys	Description
	Left Control + Mousescroll up	Scale UI and curves up
	Left Control + Mousescroll down	Scale UI and curves down
	Left Shift + Click	Spawn curve
	Left Control + G	Group selected curves
	Left Shift + Left Control + Drag	Latch a curve to another curve by dragging a free anchor close to another free anchor
	Space + Drag	Unlatch anchors that were latched together.
	H	Hide anchors and control points
	Left Control + S	Save set of existing individual curves (does not currently preserve groups or latches)
	Left Control + L	Load set of saved curves (does not currently preserve groups or latches)
	Left Control + Left Shift + H	Hide the control points
	Left Shift + T	Compute look-up table (linearizes animations)
	None	Toggle sound

How to

1. run main.rs
2. explore and have fun
3. spawn multiple curves
4. compute the look-up tables for each curve
5. latch the curves together if they are not already latched at spawn
6. move the anchors and control points to a desired position (there is a "hide control points" button for when they overlap with anchors)
7. select the latched curves by clicking and dragging a selection box
8. group the curves and repeat step 4
9. save the look-up table
10. use the look-up table in your app (see the simple_animation.rs example)

Notes

• bevy_pen_tool does not work with a Perspective Camera (only Orthographic)
• cannot save multiple groups at once, only a single one
• currently, the plugin only works with bevy version 0.5, rev="615d43b", but this will change rather soon
• pressing load will delete everything on the canvas before loading
• the gif below is a bit out of date: selection is now done by dragging the edge of a box, the look-up tables are computed upon pressing Left Shift + T or the corresponding button, and there is no undo/redo functionality at the moment