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js drawing parabola code sharing

小云云

Mar 07, 2018 am 10:32 AM

javascriptshareparabola

This article mainly shares with you the js drawing parabola code. Let's show you the renderings first. Let's take a look at the code together with the specific methods. I hope it can help you.

Rendering:
js drawing parabola code sharing

<!DOCTYPE HTML><html><head>
    <meta charset="utf-8">
    <title>抛物线运动效果</title>
    <style type="text/css">
        body {            overflow: hidden;        }
        .boll {            width: 50px;            height: 50px;            position: absolute;            top: 55%;            left: 55%;            background: url("redpack_show.jpg");            background-size: contain;        }
        .red-bag {            position: absolute;            left: 50%;            top:50%;            width: 200px;            height: 200px;            border-radius: 50%;            background: url("red_bag.png") no-repeat;            background-size: contain;            z-index:10;        }
    </style>
    <script type="text/javascript" src="jquery-2.1.4.js"></script>
    <script type="text/javascript" src="parabola.js"></script></head><body><p class="btns" style="margin-top:20px">
    <a href="http://www.css88.com/archives/5355" target="_blank">回到JavaScript实现的抛物线运动效果</a></p><p class="btns" style="margin-top:20px">
    <a href="#" class="btnA btn-danger" id="run" rel="popover" title="A Title" >run</a></p><p class="red-bag"></p><p id="target" class="target"></p><!--<p class="boll boll1"></p>--><script type="text/javascript">
    for(let i=1;i<80;i++){
        $("body").append(`<p class=&#39;boll boll${i}&#39;></p>`);
        let bool = "bool"+i;
        createSingle(bool,i);
//        console.log(i)
    }
    function createSingle(bool,i) {
        let left = i%2 == 0 ? (-getRandom(500,600)):(getRandom(500,600));
        let top = i%2 == 0? (getRandom(200,250)):(getRandom(200,250));
//        console.log(getRandom(0.005,0.01));
        bool = new Parabola({
            el: ".boll"+i,
            offset: [left, top],
            curvature: 0.005,
            duration: 3000,
            callback:function(){
//                alert("完成后回调")
            },
            stepCallback:function(x,y){
//                console.log(x,y);
//                $("<p>").appendTo("body").css({
//                    "position": "absolute",
//                    "top": this.elOriginalTop + y,
//                    "left":this.elOriginalLeft + x,
//                    "background-color":"rgba(244,21,50,.5)",
//                    "width":"2px",
//                    "height":"2px",
//                    "border-radius": "2px"
//                });
            }
        });
        $("#run").click(function (event) {
            event.preventDefault();
            bool.start();
        });
    }
    function getRandom(min,max) {
        return Math.random()*(max-min)+min;
    }

    //    $("#reset").click(function (event) {
    //        event.preventDefault();
    //        bool.reset()
    //    });
    //    $("#run").click(function (event) {
    //        event.preventDefault();
    //        bool.start();
    //    });
    //    $("#stop").click(function (event) {
    //        event.preventDefault();
    //        bool.stop();
    //    });
    //    $("#setOptions").click(function (event) {
    //        event.preventDefault();
    //        bool.setOptions({
    //            targetEl: $("#target"),
    //            curvature: 0.001,
    //            duration: 1000
    //        });
    //    });</script></body></html>

(function () {    var _$ = function (_this) {        return _this.constructor == jQuery ? _this : $(_this);
    };// 获取当前时间
    function now() {        return +new Date();
    }// 转化为整数
    function toInteger(text) {
        text = parseInt(text);        return isFinite(text) ? text : 0;
    }    var Parabola = function (options) {        this.initialize(options);
    };
    Parabola.prototype = {
        constructor: Parabola,        /**
         * 初始化
         * @classDescription 初始化
         * @param {Object} options 插件配置 .
         */
        initialize: function (options) {            this.options = this.options || this.getOptions(options);            var ops = this.options;            if (!this.options.el) {                return;
            }            this.$el = _$(ops.el);            this.timerId = null;            this.elOriginalLeft = toInteger(this.$el.css("left"));            this.elOriginalTop = toInteger(this.$el.css("top"));            // this.driftX X轴的偏移总量
            //this.driftY Y轴的偏移总量
            if (ops.targetEl) {                this.driftX = toInteger(_$(ops.targetEl).css("left")) - this.elOriginalLeft;                this.driftY = toInteger(_$(ops.targetEl).css("top")) - this.elOriginalTop;
            } else {                this.driftX = ops.offset[0];                this.driftY = ops.offset[1];
            }            this.duration = ops.duration;            // 处理公式常量
            this.curvature = ops.curvature;            // 根据两点坐标以及曲率确定运动曲线函数（也就是确定a, b的值）
            //a=this.curvature
            /* 公式： y = a*x*x + b*x + c;
             */
            /*
             * 因为经过(0, 0), 因此c = 0
             * 于是：
             * y = a * x*x + b*x;
             * y1 = a * x1*x1 + b*x1;
             * y2 = a * x2*x2 + b*x2;
             * 利用第二个坐标：
             * b = (y2+ a*x2*x2) / x2
             */
            // 于是
            this.b = ( this.driftY - this.curvature * this.driftX * this.driftX ) / this.driftX;            //自动开始
            if (ops.autostart) {                this.start();
            }
        },        /**
         * 初始化 配置参数 返回参数MAP
         * @param {Object} options 插件配置 .
         * @return {Object} 配置参数
         */
        getOptions: function (options) {            if (typeof options !== "object") {
                options = {};
            }
            options = $.extend({}, defaultSetting, _$(options.el).data(), (this.options || {}), options);            return options;
        },        /**
         * 定位
         * @param {Number} x x坐标 .
         * @param {Object} y y坐标 .
         * @return {Object} this
         */
        domove: function (x, y) {            this.$el.css({
                position: "absolute",
                left: this.elOriginalLeft + x,
                top: this.elOriginalTop + y
            });            return this;
        },        /**
         * 每一步执行
         * @param {Data} now 当前时间 .
         * @return {Object} this
         */
        step: function (now) {            var ops = this.options;            var x, y;            if (now > this.end) {                // 运行结束
                x = this.driftX;
                y = this.driftY;                this.domove(x, y);                this.stop();                if (typeof ops.callback === &#39;function&#39;) {
                    ops.callback.call(this);
                }
            } else {                //x 每一步的X轴的位置
                x = this.driftX * ((now - this.begin) / this.duration);                //每一步的Y轴的位置y = a*x*x + b*x + c;   c==0;
                y = this.curvature * x * x + this.b * x;                this.domove(x, y);                if (typeof ops.stepCallback === &#39;function&#39;) {
                    ops.stepCallback.call(this,x,y);
                }
            }            return this;
        },        /**
         * 设置options
         *  @param {Object} options 当前时间 .
         */
        setOptions: function (options) {            this.reset();            if (typeof options !== "object") {
                options = {};
            }            this.options = $.extend(this.options,options);            this.initialize(this.options);            return this;
        },        /**
         * 开始
         */
        start: function () {            var self = this;            // 设置起止时间
            this.begin = now();            this.end = this.begin + this.duration;            if (this.driftX === 0 && this.driftY === 0) {                // 原地踏步就别浪费性能了
                return;
            }            /*timers.push(this);
             Timer.start();*/
            if (!!this.timerId) {
                clearInterval(this.timerId);                this.stop();
            }            this.timerId = setInterval(function () {                var t = now();
                self.step(t);

            }, 13);            return this;
        },        /**
         * 重置
         */
        reset: function (x, y) {            this.stop();
            x = x ? x : 0;
            y = y ? y : 0;            this.domove(x, y);            return this;
        },        /**
         * 停止
         */
        stop: function () {            if (!!this.timerId) {
                clearInterval(this.timerId);

            }            return this;
        }
    };    var defaultSetting = {
        el: null,        //偏移位置
        offset: [0, 0],        //终点元素，这时就会自动获取该元素的left、top，设置了这个参数，offset将失效
        targetEl: null,        //运动的时间，默认500毫秒
        duration: 500,        //抛物线曲率，就是弯曲的程度，越接近于0越像直线，默认0.001
        curvature: 0.001,        //运动后执行的回调函数
        callback: null,        // 是否自动开始，默认为false
        autostart: false,        //运动过程中执行的回调函数
        stepCallback: null
    };
    window.Parabola = Parabola;
})();

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