Comparer: click metric graph to seek to that frame (#8)#41
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Add MetricCal::FrameAtX that maps a graph-area X pixel to a frame ID under the current view range, and let FrmsInfoView::OnLButtonDown use it to call SetScenes() and refresh the per-frame metric label. Combined with the recently-landed wheel zoom, the user can now zoom into a region of interest and click any point to jump straight to that frame. Double-click still resets the view, and clicks outside the graph area fall through to the default handler.
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Closes #8.
The PSNR/SSIM line graph in
FrmsInfoViewnow responds to left-clicks: clicking any point in the graph area callsSetScenes()to set both panes to the frame at that X position, then refreshes the per-frame metric label viaCalMetrics(). The frame is computed against the current view range, so the wheel-zoom and click-to-seek features stack naturally — zoom in to a region of interest and click any point to land exactly on that frame.How to try