Add keyframe editing, easing curves, project save/load and last frame export#15
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… export ## Keyframe Editing - Add clickable KeyframeMarker circles on canvas at each keyframe position - Click marker to select keyframe — item snaps to that position - Drag item to edit selected keyframe (position, rotation, scale) in real-time - Path lines and markers update live during edits - Rename "End Segment" to "Add Keyframe" for clarity ## Easing Per Segment - Add easing support: linear, ease_in, ease_out, ease_in_out - Easing dropdown in toolbar, stored per keyframe - Applied in both demo playback and export interpolation - Click marker to select keyframe, change easing in dropdown — updates immediately ## Live Sync - Item drag always updates the active keyframe (selected or last) - NotifyingPixmapItem callback syncs position/rotation/scale to keyframe - Guard flag prevents recursive sync loops - Remove "pending segment" blocking — segments are always in sync ## Project Save/Load - Save Project (.ttmproj) — JSON with base image path, layers, keyframes, easing, external sprites, transform state, colors - Open Project — restores full editor state including external sprites, handles, NotifyingPixmapItem callbacks, markers and path lines - External sprites saved as processed PNGs (no re-scaling on load) - Transform origin, position, rotation, scale all preserved ## Export Last Frame - Export now saves both first_frame.png and last_frame.png - Minimum 2 keyframes validation for export Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Changes
KeyframeMarkerclass with click-to-select behaviorapply_easing()function applied in both demo and export interpolationon_save_project()/on_open_project()with JSON serializationTest plan