svelte-motion/src/utils/geometry/delta-apply.js

Svelte animation library based on the React library framer-motion.

/** 
based on framer-motion@4.1.15,
Copyright (c) 2018 Framer B.V.
*/
import {fixed} from '../fix-process-env';
import { __read } from 'tslib';
import { mix } from 'popmotion';
import { isDraggable } from '../../render/utils/is-draggable.js';

/**
 * Reset an axis to the provided origin box.
 *
 * This is a mutative operation.
 */
function resetAxis(axis, originAxis) {
    axis.min = originAxis.min;
    axis.max = originAxis.max;
}
/**
 * Reset a box to the provided origin box.
 *
 * This is a mutative operation.
 */
function resetBox(box, originBox) {
    resetAxis(box.x, originBox.x);
    resetAxis(box.y, originBox.y);
}
/**
 * Scales a point based on a factor and an originPoint
 */
function scalePoint(point, scale, originPoint) {
    var distanceFromOrigin = point - originPoint;
    var scaled = scale * distanceFromOrigin;
    return originPoint + scaled;
}
/**
 * Applies a translate/scale delta to a point
 */
function applyPointDelta(point, translate, scale, originPoint, boxScale) {
    if (boxScale !== undefined) {
        point = scalePoint(point, boxScale, originPoint);
    }
    return scalePoint(point, scale, originPoint) + translate;
}
/**
 * Applies a translate/scale delta to an axis
 */
function applyAxisDelta(axis, translate, scale, originPoint, boxScale) {
    if (translate === void 0) { translate = 0; }
    if (scale === void 0) { scale = 1; }
    axis.min = applyPointDelta(axis.min, translate, scale, originPoint, boxScale);
    axis.max = applyPointDelta(axis.max, translate, scale, originPoint, boxScale);
}
/**
 * Applies a translate/scale delta to a box
 */
function applyBoxDelta(box, _a) {
    var x = _a.x, y = _a.y;
    applyAxisDelta(box.x, x.translate, x.scale, x.originPoint);
    applyAxisDelta(box.y, y.translate, y.scale, y.originPoint);
}
/**
 * Apply a transform to an axis from the latest resolved motion values.
 * This function basically acts as a bridge between a flat motion value map
 * and applyAxisDelta
 */
function applyAxisTransforms(final, axis, transforms, _a) {
    var _b = __read(_a, 3), key = _b[0], scaleKey = _b[1], originKey = _b[2];
    // Copy the current axis to the final axis before mutation
    final.min = axis.min;
    final.max = axis.max;
    var axisOrigin = transforms[originKey] !== undefined ? transforms[originKey] : 0.5;
    var originPoint = mix(axis.min, axis.max, axisOrigin);
    // Apply the axis delta to the final axis
    applyAxisDelta(final, transforms[key], transforms[scaleKey], originPoint, transforms.scale);
}
/**
 * The names of the motion values we want to apply as translation, scale and origin.
 */
var xKeys = ["x", "scaleX", "originX"];
var yKeys = ["y", "scaleY", "originY"];
/**
 * Apply a transform to a box from the latest resolved motion values.
 */
function applyBoxTransforms(finalBox, box, transforms) {
    applyAxisTransforms(finalBox.x, box.x, transforms, xKeys);
    applyAxisTransforms(finalBox.y, box.y, transforms, yKeys);
}
/**
 * Remove a delta from a point. This is essentially the steps of applyPointDelta in reverse
 */
function removePointDelta(point, translate, scale, originPoint, boxScale) {
    point -= translate;
    point = scalePoint(point, 1 / scale, originPoint);
    if (boxScale !== undefined) {
        point = scalePoint(point, 1 / boxScale, originPoint);
    }
    return point;
}
/**
 * Remove a delta from an axis. This is essentially the steps of applyAxisDelta in reverse
 */
function removeAxisDelta(axis, translate, scale, origin, boxScale) {
    if (translate === void 0) { translate = 0; }
    if (scale === void 0) { scale = 1; }
    if (origin === void 0) { origin = 0.5; }
    var originPoint = mix(axis.min, axis.max, origin) - translate;
    axis.min = removePointDelta(axis.min, translate, scale, originPoint, boxScale);
    axis.max = removePointDelta(axis.max, translate, scale, originPoint, boxScale);
}
/**
 * Remove a transforms from an axis. This is essentially the steps of applyAxisTransforms in reverse
 * and acts as a bridge between motion values and removeAxisDelta
 */
function removeAxisTransforms(axis, transforms, _a) {
    var _b = __read(_a, 3), key = _b[0], scaleKey = _b[1], originKey = _b[2];
    removeAxisDelta(axis, transforms[key], transforms[scaleKey], transforms[originKey], transforms.scale);
}
/**
 * Remove a transforms from an box. This is essentially the steps of applyAxisBox in reverse
 * and acts as a bridge between motion values and removeAxisDelta
 */
function removeBoxTransforms(box, transforms) {
    removeAxisTransforms(box.x, transforms, xKeys);
    removeAxisTransforms(box.y, transforms, yKeys);
}
/**
 * Apply a tree of deltas to a box. We do this to calculate the effect of all the transforms
 * in a tree upon our box before then calculating how to project it into our desired viewport-relative box
 *
 * This is the final nested loop within updateLayoutDelta for future refactoring
 */
function applyTreeDeltas(box, treeScale, treePath) {
    var treeLength = treePath.length;
    if (!treeLength)
        return;
    // Reset the treeScale
    treeScale.x = treeScale.y = 1;
    var node;
    var delta;
    for (var i = 0; i < treeLength; i++) {
        node = treePath[i];
        delta = node.getLayoutState().delta;
        // Incoporate each ancestor's scale into a culmulative treeScale for this component
        treeScale.x *= delta.x.scale;
        treeScale.y *= delta.y.scale;
        // Apply each ancestor's calculated delta into this component's recorded layout box
        applyBoxDelta(box, delta);
        // If this is a draggable ancestor, also incorporate the node's transform to the layout box
        if (isDraggable(node)) {
            applyBoxTransforms(box, box, node.getLatestValues());
        }
    }
}

export { applyAxisDelta, applyAxisTransforms, applyBoxDelta, applyBoxTransforms, applyPointDelta, applyTreeDeltas, removeAxisDelta, removeAxisTransforms, removeBoxTransforms, removePointDelta, resetAxis, resetBox, scalePoint };