Glass Pie Chart Transition

Prompt

Glass pie chart, one locked-off shot, static camera, no zoom, no pan, no shake, no cuts. The start frame shows a single bright blue wedge from twelve o'clock clockwise to just past eight o'clock on a blue background; the end frame shows a blue wedge from twelve to four o'clock, a deep-purple wedge from four to nine o'clock, and the rest of the dish empty, on a purple background. Between them, two motions together, slow and smooth: the blue wedge's trailing edge retreats anticlockwise from eight o'clock back to four o'clock, and a deep-purple wedge grows from that retreating edge, filling the space the blue gives up and continuing clockwise past eight until it stops at nine o'clock, so blue and purple always share one clean straight edge. At the same time the background shifts from deep blue to deep purple, and the caustic and reflections tint purple with it. The empty part of the dish stays clear. The dish, its rim, its tilt and the lighting never move. Avoid: the purple fading in, a third colour, the blue changing anywhere but at its trailing edge, any text, numbers or logos, any warping of the glass. The final frame matches the end frame exactly.