Core Animation Examples

Examples demonstrating the core-animation crate's builder APIs.

Running Examples

cargo run --example <name>

Generating Recordings

Recordings (GIF and MP4) can be automatically generated using the provided script:

./tools/update-example-screenshots.sh

The script applies a patch that adds recording support, runs all examples, and reverts the patch afterward.

Prerequisites:

• ImageMagick (brew install imagemagick)
• ffmpeg (brew install ffmpeg)

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Examples

basic_layers

Basic layer example with animated shapes. Demonstrates CALayer and CAShapeLayer with the builder APIs and GPU-accelerated animations using .animate().

cargo run --example basic_layers

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breathing_circle

Breathing circle - a soft pulsing orb with coordinated scale and opacity. Demonstrates multiple animations on one layer with phase_offset coordination.

cargo run --example breathing_circle

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emitter

Particle emitter using CAEmitterLayerBuilder with the closure-based particle configuration.

cargo run --example emitter

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loading_spinner

Loading spinner with smooth rotating indicator using linear easing. Demonstrates TransformRotation animation with Easing::Linear for constant rotational speed.

cargo run --example loading_spinner

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neon_glow

Neon glow - retro neon sign effect with pulsing shadows. Demonstrates shadow property animations (ShadowRadius, ShadowOpacity) to create a glowing neon effect.

cargo run --example neon_glow

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particle_images

Showcases all ParticleImage types side by side:

• soft_glow - Radial gradient (top-left)
• circle - Solid circle (top-right)
• star - Multi-pointed star (bottom-left)
• spark - Elongated streak (bottom-right)

cargo run --example particle_images

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point_burst

Demonstrates PointBurstBuilder - a convenience API for the common pattern of particles bursting from a point in all directions.

cargo run --example point_burst

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ripple_rings

Ripple rings - water ripple effect with concentric expanding rings. Demonstrates:

• KeyPath::TransformScale for ring expansion
• KeyPath::Opacity for rings fading as they expand
• KeyPath::Custom("lineWidth") for pulsing stroke width
• phase_offset for staggered timing across multiple rings
• Easing::Out for realistic ripple physics

cargo run --example ripple_rings

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staggered_dots

Staggered dots - classic loading indicator with phase-offset animations. Demonstrates using phase_offset to create staggered timing across multiple elements.

cargo run --example staggered_dots

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window_builder

Basic window creation with the WindowBuilder API.

cargo run --example window_builder