bbb-fusion-panzoom: Add FusionScript to deal with pan zoom events

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

bbb-fusion-panzoom.py

@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+
+import bbb
+
+REF_SIZE=(1600,901)
+
+def keyframes_from_events(pze, conv_fn, merge_threshold=1.5, fps=24):
+
+	rv = []
+	le = None
+
+	for e in pze:
+		# First ?
+		if le is None:
+			le = e
+			rv.append((0, conv_fn(e)))
+			continue
+
+		# How much time elapsed ?
+		if e.ts - le.ts > merge_threshold:
+			rv.append( (int(round((e.ts * fps))) - 1, conv_fn(le)) )
+			rv.append( (int(round((e.ts * fps))), conv_fn(e)) )
+
+		else:
+			rv.pop()
+			rv.append( (int(round(( e.ts * fps))), conv_fn(e)) )
+
+		# Last event
+		le = e
+	
+	return rv
+
+
+#  "Pan" : floating point values from -4.0*width to 4.0*width
+#  "Tilt" : floating point values from -4.0*height to 4.0*height
+#  "ZoomX" : floating point values from 0.0 to 100.0
+#  "ZoomY" : floating point values from 0.0 to 100.0
+
+def to_xform(e):
+	sz = REF_SIZE[0] / e.w
+	cx = sz * ( 0.5 -  e.x        / REF_SIZE[0])
+	cy = sz * (-0.5 + (e.y + e.h) / REF_SIZE[1])
+	return (cx, cy, sz)
+
+
+def animate_transform(filename, xform, limits=(0,None)):
+	# Load raw events
+	pze = bbb.parse_panzooms_xml(filename)
+
+	# Limits
+	pze = pze[limits[0]:limits[1]]
+
+	# Convert to keyframes 
+	kf = keyframes_from_events(pze, to_xform)
+	print(kf)
+
+	# Apply to tool
+	tool = comp.FindTool(xform)
+
+		# Switching Center/Size to animation will create a keyframe
+		# at the current time, so go to first time
+	comp.CurrentTime = kf[0][0]
+
+	tool.Center = comp.Path()
+	tool.Size   = comp.BezierSpline()
+
+	for ts, (cx, cy, sz) in kf:
+		tool.Center[ts] = [cx, cy]
+		tool.Size[ts] = sz
+
+# Edit the following as needed and run using comp.RunScript in the Fusion console
+print("Running ...")
+animate_transform('panzooms.xml', 'Transform1')
+print("Done")