react-native-image-gallery/src/libraries/ViewTransformer/Rect.js

Pure JavaScript image gallery component for iOS and Android

export default class Rect {
    constructor (left, top, right, bottom) {
        this.left = left;
        this.top = top;
        this.right = right;
        this.bottom = bottom;
    }

    set (left, top, right, bottom) {
        this.left = left;
        this.top = top;
        this.right = right;
        this.bottom = bottom;
    }

    width () {
        return this.right - this.left;
    }

    height () {
        return this.bottom - this.top;
    }

    centerX () {
        return (this.left + this.right) / 2;
    }

    centerY () {
        return (this.top + this.bottom) / 2;
    }

    offset (dx, dy) {
        this.left += dx;
        this.right += dx;
        this.top += dy;
        this.bottom += dy;
        return this;
    }

    copy () {
        return new Rect(this.left, this.top, this.right, this.bottom);
    }

    equals (rect, epsilon) {
        if (!epsilon) {
            return (
                this.left === rect.left &&
                this.top === rect.top &&
                this.right === rect.right &&
                this.bottom === rect.bottom
            );
        } else {
            return (
                Math.abs(this.left - rect.left) < epsilon &&
                Math.abs(this.top - rect.top) < epsilon &&
                Math.abs(this.right - rect.right) < epsilon &&
                Math.abs(this.bottom - rect.bottom) < epsilon
            );
        }
    }

    isValid () {
        if (typeof this.left === 'number' &&
            typeof this.right === 'number' &&
            typeof this.top === 'number' &&
            typeof this.bottom === 'number') {
            return true;
        }
        return false;
    }
}