deetween 0.0.3

📽 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
• ValueSequence
• Keyframe
• KeyframeGroup

Examples

Tween

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

import deetween;

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

    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);
}

ValueSequence

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

import deetween;

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

    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);
}

KeyframeGroup

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

import deetween;

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

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

    assert(group.length == 2);
    assert(group.now == a);
    while (!group.hasFinished) {
        float value = group.update(dt);
        assert(value >= a && value <= b);
    }
    assert(group.now == b);
    group.clear();
    assert(group.length == 0);
}

Influences

• Godot
• Gween
• Keyframe

Credits

The easing functions were ported from JavaScript to D from this site.

License

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