ambient-cbg-ts/lib/cjs/components/CanvasBackground.js

A React.js webpage backgrounds created using the HTML5 Canvas API and jwagner's Simplex Noise library

"use strict";
var __extends = (this && this.__extends) || (function () {
    var extendStatics = function (d, b) {
        extendStatics = Object.setPrototypeOf ||
            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
        return extendStatics(d, b);
    };
    return function (d, b) {
        if (typeof b !== "function" && b !== null)
            throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
var __assign = (this && this.__assign) || function () {
    __assign = Object.assign || function(t) {
        for (var s, i = 1, n = arguments.length; i < n; i++) {
            s = arguments[i];
            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
                t[p] = s[p];
        }
        return t;
    };
    return __assign.apply(this, arguments);
};
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
    var result = {};
    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
    __setModuleDefault(result, mod);
    return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
var react_1 = __importStar(require("react"));
var InitialStyles = {
    position: "fixed",
    zIndex: -1,
    top: 0,
    left: 0,
    width: 100 + "vw",
    height: 100 + "vh",
};
var CanvasBackground = /** @class */ (function (_super) {
    __extends(CanvasBackground, _super);
    function CanvasBackground(props) {
        var _this = _super.call(this, props) || this;
        _this.canvasA = react_1.default.createRef();
        _this.canvasB = react_1.default.createRef();
        _this.ctx = null;
        _this.center = [];
        _this.frameId = null;
        _this.tick = 0;
        return _this;
    }
    CanvasBackground.prototype.componentDidMount = function () {
        this.createCanvas();
        this.resize();
        this.init();
        this.startLoop();
        window.addEventListener("resize", this.resize.bind(this));
    };
    CanvasBackground.prototype.componentWillUnmount = function () {
        if (this.frameId) {
            window.cancelAnimationFrame(this.frameId);
        }
    };
    CanvasBackground.prototype.init = function () { };
    CanvasBackground.prototype.draw = function () { };
    CanvasBackground.prototype.render = function () {
        var userStyles = this.props.styles;
        return (react_1.default.createElement(react_1.default.Fragment, null,
            react_1.default.createElement("canvas", { ref: this.canvasA, style: __assign(__assign({}, InitialStyles), userStyles) }),
            react_1.default.createElement("canvas", { ref: this.canvasB, style: __assign(__assign({}, InitialStyles), userStyles) })));
    };
    CanvasBackground.prototype.createCanvas = function () {
        if (this.canvasA.current && this.canvasB.current) {
            this.ctx = {
                a: this.canvasA.current.getContext("2d"),
                b: this.canvasB.current.getContext("2d"),
            };
        }
        this.center = [];
        this.tick = 0;
    };
    CanvasBackground.prototype.resize = function () {
        var _a, _b;
        var innerWidth = window.innerWidth, innerHeight = window.innerHeight;
        var ca = this.canvasA.current;
        var cb = this.canvasB.current;
        var ctxa = (_a = this.ctx) === null || _a === void 0 ? void 0 : _a.a;
        var ctxb = (_b = this.ctx) === null || _b === void 0 ? void 0 : _b.b;
        if (ca && cb && ctxa && ctxb) {
            // Canvas A
            ca.width = innerWidth;
            ca.height = innerHeight;
            ctxa.drawImage(cb, 0, 0);
            // Canvas B
            cb.width = innerWidth;
            cb.height = innerHeight;
            ctxb.drawImage(ca, 0, 0);
            this.center[0] = 0.5 * ca.width;
            this.center[1] = 0.5 * ca.height;
        }
    };
    CanvasBackground.prototype.startLoop = function () {
        if (this.frameId == null) {
            this.frameId = window.requestAnimationFrame(this.initDraw.bind(this));
        }
    };
    CanvasBackground.prototype.initDraw = function () {
        this.draw();
        this.frameId = window.requestAnimationFrame(this.initDraw.bind(this));
    };
    CanvasBackground.defaultProps = {
        styles: InitialStyles,
    };
    return CanvasBackground;
}(react_1.Component));
exports.default = CanvasBackground;