隨機線條特效


一次偶然在網上看到一個隨機線條頁面,看起來狂拽炫酷,今日得空先記錄下來~

隨機線條

廢話不多說,上圖:

            

如上圖所示,在登陸界面用到了隨機線條作為背景,點擊登陸后跳轉到自定義的404界面。實現方式如下:

方法1:

引入外部Js:

<script src="http://open.sojson.com/common/js/canvas-nest.min.js" count="200" zindex="-2" opacity="0.5" color="47,135,193" type="text/javascript">
</script>

可以直接使用,open.sojson.com是公開sdn域名,sojson工具站提供流量支持,嘻嘻~

溫馨提示:需要將引入的Js放到body里面。

 

方式二:自己新建js,將js拷貝過去,同樣可以使用,引用方式和上面的一樣

js代碼

! function() {
    //封裝方法,壓縮之后減少文件大小
    function get_attribute(node, attr, default_value) {
        return node.getAttribute(attr) || default_value;
    }
    //封裝方法,壓縮之后減少文件大小
    function get_by_tagname(name) {
        return document.getElementsByTagName(name);
    }
    //獲取配置參數
    function get_config_option() {
        var scripts = get_by_tagname("script"),
            script_len = scripts.length,
            script = scripts[script_len - 1]; //當前加載的script
        return {
            l: script_len, //長度,用於生成id用
            z: get_attribute(script, "zIndex", -1), //層級
            o: get_attribute(script, "opacity", 0.5), //透明度
            c: get_attribute(script, "color", "0,0,0"), //線條顏色,最好使用RGB顏色
            n: get_attribute(script, "count", 99) //線條數量
        };
    }
    //設置canvas的高寬
    function set_canvas_size() {
        canvas_width = the_canvas.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth, 
        canvas_height = the_canvas.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
    }

    //繪制過程
    function draw_canvas() {
        context.clearRect(0, 0, canvas_width, canvas_height);
        //隨機的線條和當前位置聯合數組
        var all_array = [current_point].concat(random_lines);
        var e, i, d, x_dist, y_dist, dist; //臨時節點
        //遍歷處理每一個點
        random_lines.forEach(function(r) {
            r.x += r.xa, 
            r.y += r.ya, //移動
            r.xa *= r.x > canvas_width || r.x < 0 ? -1 : 1, 
            r.ya *= r.y > canvas_height || r.y < 0 ? -1 : 1, //碰到邊界,反向反彈
            context.fillRect(r.x - 0.5, r.y - 0.5, 1, 1); //繪制一個寬高為1的點
            for (i = 0; i < all_array.length; i++) {
                e = all_array[i];
                //不是當前點
                if (r !== e && null !== e.x && null !== e.y) {
                        x_dist = r.x - e.x, //x軸距離 l
                        y_dist = r.y - e.y, //y軸距離 n
                        dist = x_dist * x_dist + y_dist * y_dist; //總距離, m
                    dist < e.max && (e === current_point && dist >= e.max / 2 && (r.x -= 0.03 * x_dist, r.y -= 0.03 * y_dist), //靠近的時候加速
                        d = (e.max - dist) / e.max, 
                        context.beginPath(), 
                        context.lineWidth = d / 2, 
                        context.strokeStyle = "rgba(" + config.c + "," + (d + 0.2) + ")", 
                        context.moveTo(r.x, r.y), 
                        context.lineTo(e.x, e.y), 
                        context.stroke());
                }
            }
            all_array.splice(all_array.indexOf(r), 1);

        }), frame_func(draw_canvas);
    }
    //創建畫布,並添加到body中
    var the_canvas = document.createElement("canvas"), //畫布
        config = get_config_option(), //配置
        canvas_id = "c_n" + config.l, //canvas id
        context = the_canvas.getContext("2d"), canvas_width, canvas_height, 
        frame_func = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(func) {
            window.setTimeout(func, 1000 / 45);
        }, random = Math.random, 
        current_point = {
            x: null, //當前鼠標x
            y: null, //當前鼠標y
            max: 20000
        };
    the_canvas.id = canvas_id;
    the_canvas.style.cssText = "position:fixed;top:0;left:0;z-index:" + config.z + ";opacity:" + config.o;
    get_by_tagname("body")[0].appendChild(the_canvas);
    //初始化畫布大小

    set_canvas_size(), window.onresize = set_canvas_size;
    //當時鼠標位置存儲,離開的時候,釋放當前位置信息
    window.onmousemove = function(e) {
        e = e || window.event, current_point.x = e.clientX, current_point.y = e.clientY;
    }, window.onmouseout = function() {
        current_point.x = null, current_point.y = null;
    };
    //隨機生成config.n條線位置信息
    for (var random_lines = [], i = 0; config.n > i; i++) {
        var x = random() * canvas_width, //隨機位置
            y = random() * canvas_height,
            xa = 2 * random() - 1, //隨機運動方向
            ya = 2 * random() - 1;
        random_lines.push({
            x: x,
            y: y,
            xa: xa,
            ya: ya,
            max: 6000 //沾附距離
        });
    }
    //0.1秒后繪制
    setTimeout(function() {
        draw_canvas();
    }, 100);
}();

加載頁面

New Add2016.12.22 

我的博客------ 首頁加載界面實現方式(采用HTML+CSS)

HTML代碼

<div class="loading">
<img src="http://images.cnblogs.com/cnblogs_com/zhangxiaoyong/770736/o_zoro.gif" />
<span>永不停歇,向上人生路!</span>            
</div>

CSS代碼:

 .loading {
    position: fixed;
    top: 0;
    z-index: 999;
    height: 100%;
    width: 100%;
   text-align: center;
    background: #ffffff;
    font-size: 18px;
   visibility: hidden;
   opacity: 0;
   -webkit-animation: loading 3s linear; /**此處是3秒消失,可根據自行需要調整時間**/
 }
 .loading img {
   margin-top: 100px;
 }
 @-webkit-keyframes loading {
   0%{opacity: 1;visibility: visible;}
   90%{opacity: 1;}
   100%{opacity: 0;visibility: visible;} 
 }

加載效果

 


免責聲明!

本站轉載的文章為個人學習借鑒使用,本站對版權不負任何法律責任。如果侵犯了您的隱私權益,請聯系本站郵箱yoyou2525@163.com刪除。



 
粵ICP備18138465號   © 2018-2025 CODEPRJ.COM