rs-react-native-image-gallery/lib/_helpers.js

React Native Image Gallery with Thumbnails

/**
 * Calculate squared distance between two points
 * @param a First coordinate
 * @param b Second coordinate
 */
export var pow2abs = function (a, b) { return Math.pow((a - b), 2); };
/**
 * Get distance between two touch points
 * @param touches Array of touch events
 */
export var getDistance = function (touches) {
    // Early validation
    if (!touches || touches.length < 2)
        return 0;
    var a = touches[0], b = touches[1];
    // Null check with optional chaining
    if (!(a === null || a === void 0 ? void 0 : a.pageX) || !(b === null || b === void 0 ? void 0 : b.pageX) || !(a === null || a === void 0 ? void 0 : a.pageY) || !(b === null || b === void 0 ? void 0 : b.pageY))
        return 0;
    return Math.sqrt(pow2abs(a.pageX, b.pageX) + pow2abs(a.pageY, b.pageY));
};
/**
 * Calculate scale based on distance ratio with a multiplier
 * @param currentDistance Current distance between touch points
 * @param initialDistance Initial distance between touch points
 */
export var getScale = function (currentDistance, initialDistance) {
    // Prevent division by zero
    if (!initialDistance)
        return 1;
    return (currentDistance / initialDistance) * 1.2;
};
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