17 lines
526 B
Python
17 lines
526 B
Python
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def scroll(clip, h=None, w=None, x_speed=0, y_speed=0,
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x_start=0, y_start=0, apply_to="mask"):
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""" Scrolls horizontally or vertically a clip, e.g. to make end
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credits """
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if h is None: h = clip.h
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if w is None: w = clip.w
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xmax = clip.w-w-1
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ymax = clip.h-h-1
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def f(gf,t):
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x = int(max(0, min(xmax, x_start+ round(x_speed*t))))
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y = int(max(0, min(ymax, y_start+ round(y_speed*t))))
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return gf(t)[y:y+h, x:x+w]
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return clip.fl(f, apply_to = apply_to)
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