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skills/slack-gif-creator/templates/shake.py

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+#!/usr/bin/env python3
+"""
+Shake Animation Template - Creates shaking/vibrating motion.
+
+Use this for impact effects, emphasis, or nervous/excited reactions.
+"""
+
+import sys
+import math
+from pathlib import Path
+
+sys.path.append(str(Path(__file__).parent.parent))
+
+from core.gif_builder import GIFBuilder
+from core.frame_composer import create_blank_frame, draw_circle, draw_emoji, draw_text
+from core.easing import ease_out_quad
+
+
+def create_shake_animation(
+    object_type: str = 'emoji',
+    object_data: dict = None,
+    num_frames: int = 20,
+    shake_intensity: int = 15,
+    center_x: int = 240,
+    center_y: int = 240,
+    direction: str = 'horizontal',  # 'horizontal', 'vertical', or 'both'
+    frame_width: int = 480,
+    frame_height: int = 480,
+    bg_color: tuple[int, int, int] = (255, 255, 255)
+) -> list:
+    """
+    Create frames for a shaking animation.
+
+    Args:
+        object_type: 'circle', 'emoji', 'text', or 'custom'
+        object_data: Data for the object
+        num_frames: Number of frames
+        shake_intensity: Maximum shake displacement in pixels
+        center_x: Center X position
+        center_y: Center Y position
+        direction: 'horizontal', 'vertical', or 'both'
+        frame_width: Frame width
+        frame_height: Frame height
+        bg_color: Background color
+
+    Returns:
+        List of frames
+    """
+    frames = []
+
+    # Default object data
+    if object_data is None:
+        if object_type == 'emoji':
+            object_data = {'emoji': '😱', 'size': 80}
+        elif object_type == 'text':
+            object_data = {'text': 'SHAKE!', 'font_size': 50, 'color': (255, 0, 0)}
+
+    for i in range(num_frames):
+        frame = create_blank_frame(frame_width, frame_height, bg_color)
+
+        # Calculate progress
+        t = i / (num_frames - 1) if num_frames > 1 else 0
+
+        # Decay shake intensity over time
+        intensity = shake_intensity * (1 - ease_out_quad(t))
+
+        # Calculate shake offset using sine wave for smooth oscillation
+        freq = 3  # Oscillation frequency
+        offset_x = 0
+        offset_y = 0
+
+        if direction in ['horizontal', 'both']:
+            offset_x = int(math.sin(t * freq * 2 * math.pi) * intensity)
+
+        if direction in ['vertical', 'both']:
+            offset_y = int(math.cos(t * freq * 2 * math.pi) * intensity)
+
+        # Apply offset
+        x = center_x + offset_x
+        y = center_y + offset_y
+
+        # Draw object
+        if object_type == 'emoji':
+            draw_emoji(
+                frame,
+                emoji=object_data['emoji'],
+                position=(x - object_data['size'] // 2, y - object_data['size'] // 2),
+                size=object_data['size']
+            )
+        elif object_type == 'text':
+            draw_text(
+                frame,
+                text=object_data['text'],
+                position=(x, y),
+                font_size=object_data['font_size'],
+                color=object_data['color'],
+                centered=True
+            )
+        elif object_type == 'circle':
+            draw_circle(
+                frame,
+                center=(x, y),
+                radius=object_data.get('radius', 30),
+                fill_color=object_data.get('color', (100, 100, 255))
+            )
+
+        frames.append(frame)
+
+    return frames
+
+
+# Example usage
+if __name__ == '__main__':
+    print("Creating shake GIF...")
+
+    builder = GIFBuilder(width=480, height=480, fps=24)
+
+    frames = create_shake_animation(
+        object_type='emoji',
+        object_data={'emoji': '😱', 'size': 100},
+        num_frames=30,
+        shake_intensity=20,
+        direction='both'
+    )
+
+    builder.add_frames(frames)
+    builder.save('shake_test.gif', num_colors=128)