Keyframe editor built in to Vuo Editor

Related: Keyframe Editor Node

Tentative plan:

• Keyframe pane — attached to bottom of Vuo Editor's composition windows (like in Alex's mockup image above)
  • make it available to Image Filter and Image Generator compositions
  • menu item to show/hide
  • widget to set end behavior:
    1. freeze on last keyframe (and freeze time)
    2. loop back to beginning (and reset time to 0)
  • show time ruler (tickmarks/labels appropriate for zoom level)
  • show playhead (triangle on time ruler + line through all keyframe tracks)
  • buttons to zoom in/out on time axis
  • show a separate track for each published input port
    • for numeric values (VuoInteger, VuoReal), show an XY plot
    • for multi-numeric values (VuoPoint2d/3d/4d), show multiple tracks, each with an XY plot
    • for all other values, a 1D track with step transition
  • button to collapse/expand each track to make room for other tracks
  • drag border between tracks to change expanded track's height
• Interact with playhead
  • drag playhead
  • play/pause
  • go to beginning
• Edit keyframes
  • drag keyframe on X axis to change time
  • drag keyframe beyond the right edge to expand the scroll area / total timeline length
  • right-click on track label to edit port details (change name, specify the Y axis range for XY tracks)
  • double-click inside track (or right-click and pick from context menu) to create a keyframe
  • click on keyframe and press Delete key (or right-click and pick from context menu) to delete
  • for XY tracks:
    • drag keyframe on Y axis to change value
    • drag curve on Y axis to change both endpoints
    • right-click on curve segments to change between step/linear/cubic
  • for 1D tracks:
    • double-click to show input editor to type in value
• Store keyframes in composition (.vuo) file
  • also store track heights and collapsed/expanded status
• Be able to run a keyframed composition from Vuo Editor
  • feed playhead into time published input port
  • feed values into other published input ports
  • alter protocol drivers to support feeding data into time published input port (like VuoPluginApp)
• Be able to export a keyframed composition to a movie
• Be able to export a keyframed composition as a standalone Mac OS X app