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Add function ConvertFlashRotation

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Star Brilliant 2014-04-12 14:33:31 +08:00
parent 0a6a50b7aa
commit 5eff4eb19c
1 changed files with 35 additions and 0 deletions
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35
danmaku2ass.py
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@ -507,6 +507,41 @@ def GetZoomFactor(SourceSize, TargetSize):
return GetZoomFactor.Cached_Result
# Calculation is based on https://github.com/jabbany/CommentCoreLibrary/issues/5#issuecomment-40087282
# Input: X relative horizonal coordinate: 0 for left edge, 1 for right edge.
# FOV = 1.0/math.tan(100*math.pi/360.0)
# Result: (rotX, rotY, rotZ, shearX, shearY)
def ConvertFlashRotation(rotY, rotZ, X, FOV=math.tan(2*math.pi/9.0)):
X = 2*X-1;
rotY = 180-((180-rotY)%360)
rotZ = 180-((180-rotZ)%360)
if 0 <= rotY <= 180:
costheta = (FOV*math.cos(rotY*math.pi/180.0)-X*math.sin(rotY*math.pi/180.0))/(FOV+max(2, abs(X)+1)*sin(rotY*math.pi/180.0))
try:
if costheta > 1:
costheta = 1
raise ValueError
elif costheta < -1:
costheta = -1
raise ValueError
except ValueError:
logging.error('Clipped rotation angle: (rotY=%s, rotZ=%s, X=%s), it is a bug!' % (rotY, rotZ, X))
theta = math.acos(costheta)*180/math.pi
else:
costheta = (FOV*math.cos(rotY*math.pi/180.0)+X*math.sin(rotY*math.pi/180.0))/(FOV-max(2, abs(X)+1)*sin(rotY*math.pi/180.0))
try:
if costheta > 1:
costheta = 1
raise ValueError
elif costheta < -1:
costheta = -1
raise ValueError
except ValueError:
logging.error('Clipped rotation angle: (rotY=%s, rotZ=%s, X=%s), it is a bug!' % (rotY, rotZ, X))
theta = -math.acos(costheta)*180/math.pi
return (theta*math.sin(rotZ*math.pi/180.0), theta*math.cos(rotZ*math.pi/180.0), rotZ, 0, 0)
def ProcessComments(comments, f, width, height, bottomReserved, fontface, fontsize, alpha, lifetime, reduced, progress_callback):
styleid = 'Danmaku2ASS_%04x' % random.randint(0, 0xffff)
WriteASSHead(f, width, height, fontface, fontsize, alpha, styleid)