valaxy-addon-live2d/helpers/dragging.js

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export function draggable(_model) {
    const model = _model;
    model.on('pointerdown', onPointerDown);
    model.on('pointermove', onPointerMove);
    model.on('pointerup', onPointerUp);
    model.on('pointerupoutside', onPointerUp);
}
function onPointerDown(e) {
    this.dragging = true;
    this._pointerX = e.data.global.x - this.x;
    this._pointerY = e.data.global.y - this.y;
}
function onPointerMove(e) {
    if (this.dragging) {
        this.position.x = e.data.global.x - this._pointerX;
        this.position.y = e.data.global.y - this._pointerY;
    }
}
function onPointerUp(_e) {
    this.dragging = false;
}