🎨 Ripple

Ripple is a simple, lightweight, and easy-to-use Roblox library for creating simple transitions and animations. It is inspired by roact-spring and is primarily intended to be a general-use alternative to Flipper for Roblox-TS.

You may use Ripple with or without Roact. Currently, there is no package for using Ripple with Roact.

📦 Installation

Ripple is available on NPM and can be installed with the following commands:

npm install @rbxts/ripple
yarn add @rbxts/ripple
pnpm add @rbxts/ripple

# Wally
Ripple = "littensy/ripple@version"

📚 Documentation

To see Ripple in action, check out the example repository.

⚡ Quick Start

Call createMotion to create an animation.

Use the spring, linear, immediate, and tween methods to set the goal of your animation.

import { Motion, MotionGoal, config, createMotion } from "@rbxts/ripple";

const motion = createMotion(Vector3.zero, { start: true });

motion.spring(Vector3.one, config.spring.stiff);

motion.onStep((value, deltaTime) => {
    print(value, deltaTime);
});

print(motion.get());

You can also apply different goal types to specific properties using the to method:

const motion = createMotion({ x: 0, y: 0 });

motion.to({
    x: spring(100, config.spring.stiff),
    y: linear(100),
});

⚛️ Usage with React

useMotion(initialValue)

Creates a memoized Motion object set to the given initial value.

Returns a binding that updates with the Motion, along with the Motion object.

function MyComponent() {
    const [binding, motion] = useMotion(0);
    // ...
}

export function useMotion(initialValue: number): LuaTuple<[Binding<number>, Motion]>;

export function useMotion<T extends MotionGoal>(initialValue: T): LuaTuple<[Binding<T>, Motion<T>]>;

export function useMotion<T extends MotionGoal>(initialValue: T) {
    const motion = useMemo(() => {
        return createMotion(initialValue);
    }, []);

    const [binding, setValue] = useBinding(initialValue);

    useEventListener(RunService.Heartbeat, (delta) => {
        const value = motion.step(delta);

        if (value !== binding.getValue()) {
            setValue(value);
        }
    });

    return $tuple(binding, motion);
}

useSpring(value, springConfig?)

Applies spring animations to the given value, and updates the goal with the latest value on every re-render.

Returns a binding that updates with the Motion.

function MyComponent({ someValue }: Props) {
    const binding = useSpring(someValue);
    // ...
}

export function useSpring(goal: number | Binding<number>, options?: SpringOptions): Binding<number>;

export function useSpring<T extends MotionGoal>(goal: T | Binding<T>, options?: SpringOptions): Binding<T>;

export function useSpring(goal: MotionGoal | Binding<MotionGoal>, options?: SpringOptions) {
    const [binding, motion] = useMotion(getBindingValue(goal));
    const previousValue = useRef(getBindingValue(goal));

    useEventListener(RunService.Heartbeat, () => {
        const currentValue = getBindingValue(goal);

        if (currentValue !== previousValue.current) {
            previousValue.current = currentValue;
            motion.spring(currentValue, options);
        }
    });

    return binding;
}

📝 License

Ripple is licensed under the MIT License.