deetween ~main

📽 Deetween

A cool animation library for the D programming language. Deetween is a single-file library designed to be a simple foundation for creating complex animation systems.

Types

• EasingFunc
• TweenMode
• Tween
• Keyframe
• KeyframeGroup
• ValueSequence

Examples

Tween

A simple a-to-b animation that lasts 1.0 seconds.

import deetween;

void main() {
    const a = 9.0f;
    const b = 20.0f;
    const totalDuration = 1.0f;
    const dt = 0.001f;

    auto tween = Tween(a, b, totalDuration, TweenMode.bomb);

    assert(tween.now == a);
    while (!tween.hasFinished) {
        float value = tween.update(dt);
        assert(value >= a && value <= b);
    }
    assert(tween.now == b);
}

KeyframeGroup

A simple a-to-b animation that lasts 1.0 seconds.

import deetween;

void main() {
    const a = 9.0f;
    const b = 20.0f;
    const totalDuration = 1.0f;
    const dt = 0.001f;

    auto group = KeyframeGroup(totalDuration, TweenMode.bomb);
    group.append(
        Keyframe(a, 0.0f),
        Keyframe(b, totalDuration),
    );

    assert(group.now == a);
    while (!group.hasFinished) {
        float value = group.update(dt);
        assert(value >= a && value <= b);
    }
    assert(group.now == b);
}

ValueSequence

A simple a-to-b animation where each value lasts 0.1 seconds.

import deetween;

void main() {
    const a = 9;
    const b = 20;
    const valueDuration = 0.1f;
    const dt = 0.001f;

    auto sequence = ValueSequence(a, b, valueDuration, TweenMode.bomb);

    assert(sequence.now == a);
    while (!sequence.hasFinished) {
        int value = sequence.update(dt);
        assert(value >= a && value <= b);
    }
    assert(sequence.now == b);
}

Influences

• Godot
• Gween
• Keyframe

Credits

• The easing functions were ported from JavaScript to D from this site.
• Some functions were written using this site as a reference.

License

The project is released under the terms of the Apache-2.0 License. Please refer to the LICENSE file.