scofano
405e4b4d19
Introduces a new animations.py module with easing, opacity, and offset helpers. Updates nodes.py to support animated text overlays, including fade and move-in effects, with new parameters for animation kind, duration, easing, and opacity. The node now handles both single images and batches, animating the overlay for a configurable number of frames and holding the final pose for the remainder of the sequence.
49 lines
1.5 KiB
Python
49 lines
1.5 KiB
Python
from typing import Tuple
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# Easing -------------------------------------------------------------
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def progress(t: int, T_minus1: int, ease: str) -> float:
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if T_minus1 <= 0:
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return 1.0
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x = float(t) / float(T_minus1)
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if ease == "linear":
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return x
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if ease == "ease_in":
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return x * x
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if ease == "ease_out":
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return 1 - (1 - x) * (1 - x)
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if ease == "ease_in_out":
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if x < 0.5:
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return 2 * x * x
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return 1 - (-2 * x + 2) ** 2 / 2
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return x
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# Opacity ------------------------------------------------------------
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def compute_opacity(kind: str, p: float, target: float) -> float:
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"""
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kind: 'fade_in' | 'fade_out' | others
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p in [0,1], target in [0,1]
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"""
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target = max(0.0, min(1.0, float(target)))
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if kind == "fade_out":
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return target * (1.0 - p)
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if kind == "fade_in":
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return target * p
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return target
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# Offsets ------------------------------------------------------------
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def compute_offsets(kind: str, p: float, img_w: int, img_h: int) -> Tuple[int, int]:
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"""
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Move from off-screen-ish towards the final position.
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p=0 => max offset, p=1 => 0 offset.
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"""
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dx = dy = 0.0
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if kind == "move_from_left":
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dx = -(img_w * (1.0 - p) * 0.5)
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elif kind == "move_from_right":
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dx = (img_w * (1.0 - p) * 0.5)
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elif kind == "move_from_top":
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dy = -(img_h * (1.0 - p) * 0.5)
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elif kind == "move_from_bottom":
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dy = (img_h * (1.0 - p) * 0.5)
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return int(round(dx)), int(round(dy))
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