Tweening an vector isn't work if value of property is 0

Horchynskyi · January 12, 2021, 10:44pm

Hi, I noticed strange behavior when I try to make “yoyo” and return vector to its zero value.

repeatTw() {
    const {vector} = this;

    console.log(vector.x);

    tween(vector)
        .to(2, {x: 1})
        .to(2, {x: 0})
        .call(() => this.repeatTw())
        .start();
}

if I write this code, vector.x become to value 1, but never return to value 0.
if I change second “x” property to 0.0001 it works.

I add test project you can look cube doesn’t return to “x” position 0:
Cocos Creator 3 preview.

Tween_Bug.zip (1.2 MB)

jiaxin · January 13, 2021, 3:23am

Thanks for the bug report!

We have fixed this issue on the development branch, you can refer to the following code :

github.com

cocos-creator/engine/blob/3d/cocos/tween/tween-action.ts#L140


this._props = Object.create(null);
for (const name in props) {
    // filtering if
    // - it was not own property
    // - types was function / string
    // - it was undefined / null
    // eslint-disable-next-line no-prototype-builtins
    if (!props.hasOwnProperty(name)) continue;
    let value = props[name];
    if (value == null || typeof value === 'string' || typeof value === 'function') continue;
    // property may have custom easing or progress function
    let easing: any; let progress: any;
    if (value.value !== undefined && (value.easing || value.progress)) {
        if (typeof value.easing === 'string') {
            easing = easing[value.easing];
            if (!easing) warnID(1031, value.easing);
        } else {
            easing = value.easing;
        }
        progress = value.progress;

system · January 14, 2021, 3:23am

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