added leversc spinMovie.py

src/Python/leversc/spinMovie.py

+""" Python sample for using the leversc multichannel 3-d viewer to generate a video
+        mark winter and andrew r. cohen
+
+        this script generates an mp4. it was tested on windows, but may work on other platforms.
+        it relies on scikit-video (pip install scikit-video) and ffmpeg (you must download and install)
+"""
+
+
+import numpy as np, matplotlib.pyplot as plt
+from leversc import leversc
+import time
+import skvideo
+# note - you must download ffmpeg and enter the path to the bin folder here!
+skvideo.setFFmpegPath('C:\\Users\\ANDYR\\git\\ffmpeg-master-latest-win64-gpl\\bin')
+import skvideo.io
+
+def setMovieUI(lsc):
+    """ setMovieUI(lsc) - sets the ui elements for screen capture
+            lsc - leversc class instance
+    """
+    # wait for leversc to finish any image render before we set ui
+    # so all pending ui updates are completed before our changes
+    while (not lsc1.drawComplete()):
+        time.sleep(0.1)
+    # pull ui dictionary, modify and then write it back
+    # this allows us to properly use the property setter, and also allows 
+    # bulk property changes
+    ui=lsc.uiParams
+    ui['webToolbar']='none'
+    ui['clockButton']='none'
+    ui['sidebar']='none'
+    lsc.uiParams=ui
+
+# show the .LEVER sample image
+strDB='../../sampleImages/lscSampleImage.LEVER'
+(im,CONSTANTS)=leversc.readImage(strDB)
+lsc1 = leversc(im=im,imD=CONSTANTS)
+
+# hint - i like to set a breakpoint here in the debugger and adjust the leversc viewer window
+# so the aspect ratio and view settings looks right for my movie
+pass
+
+# set UI to look better for movie capture
+setMovieUI(lsc1)
+
+# hint - you may want to check that your UI windows looks good after turning off the elements 
+# via setMovieUI
+pass
+
+outputFile='sampleVolume.mp4'
+# set pix_fmt to yuv420p because windows media player has trouble with default mp4 setting
+# note - VLC plays the default so if you have trouble, try that
+writer = skvideo.io.FFmpegWriter(outputFile, outputdict={"-pix_fmt": "yuv420p"})
+# spin the volume, capturing and writing frames
+angles = np.linspace(0,np.pi,50);
+for theta in angles:
+    # set the rotation matrix
+    lsc1.viewParams['worldRot']=[np.cos(theta), 0, np.sin(theta),0,
+        0,1,0,0,
+        -np.sin(theta),0,np.cos(theta),0,
+        0,0,0,1]
+    # alternative rotations / zoom adjustments / etc. as needed 
+    # ...
+    # now grab image
+    im=lsc1.captureImage()
+    writer.writeFrame(im)
+writer.close()
+pass
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