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手绘板第二版欢迎指正~~~~~~

这是最近改的第二版，比原先一版进步了一些，但是还是有很多问题，欢迎发现bug并告诉我~~~

话不多说，上代码：

index.html

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="maximum-scale=1.0,minimum-scale=1.0,user-scalable=0,width=device-width,initial-scale=1.0"/>
    <title>title</title>
    <link rel="stylesheet" type="text/css" href="../css/api.css"/>
    <link rel="stylesheet" type="text/css" href="index.css"/>
    <style>
        html,body{
            height: 100%;
            width: 100%;
            background-color: #ccc;
            overflow: hidden;
        }
        .header{
            margin: 0 auto;
            font-size: 40px;
            text-align: center;
        }
    </style>
</head>
<body>
<button class="a">请点击</button>
<div style='white-space: pre-wrap;  320px;height: auto;overflow: hidden;'>
aaaaaaaaaaaaaa
aaaaaaaaaaaaaaa
ssssssssss
ccccccccccccc
ffffffffffffffffffffffffffffffffffffffffffffff
vvvvvvvvvvvvvvvvvvvv
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
ddddddd
ddddddddddddddddddddd
ddddddddddddddddddddddddddddddddddddd
ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
bbbbbbbbbbbbb
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
bbbbbbb
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
nnnnnnnnnnnnnnnnnnnnnnnnnnnnn
nnnnnnnnnn
</div>
<canvas id="boardNew" class="board" style="display: none;">您的浏览器不支持</canvas>
</body>
<script type="text/javascript" src="jquery-2.1.1.js"></script>
<script type="text/javascript" src="index.js"></script>
<script>
    $(function(){
        $('.a').on('click',function(){
            showHandWrite();
        });
        showHandWrite();
    });
</script>
</html>

index.css

.writeHand {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
.headOfWriteHand {
    display: -webkit-box; /* OLD - iOS 6-, Safari 3.1-6 */
    display: -moz-box; /* OLD - Firefox 19- (buggy but mostly works) */
    display: -ms-flexbox; /* TWEENER - IE 10 */
    display: -webkit-flex; /* NEW - Chrome */
    display: flex; /* NEW, Spec - Opera 12.1, Firefox 20+ */
    padding-left: 8%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 999;
    height: 50px;
    width: 92%;
    background-color: #23c6c8;
}
.headOfWriteHand div {
    -webkit-box-flex: 1; /* OLD - iOS 6-, Safari 3.1-6 */
    -moz-box-flex: 1; /* OLD - Firefox 19- */
    width: 20%; /* For old syntax, otherwise collapses. */
    -webkit-flex: 1; /* Chrome */
    -ms-flex: 1; /* IE 10 */
    flex: 1; /* NEW, Spec - Opera 12.1, Firefox 20+ */
    /*margin-left: 4%;
     margin-right: 4%;*/
    padding: 5px;
    vertical-align: middle;
    line-height: 40px;
    height: 40px;
}
.headOfWriteHand img {
    margin-top: 8px;
    height: 25px;
}
.mainOfWriteHand {
    position: relative;
    top: 50px;
    height: auto;
    width: auto;
    overflow: scroll;
    background-color: rgba(255,255,255,0.7);
}
canvas {
    /*background-color: yellow;*/
}

index.js

function showHandWrite(){
    var node = $('<div class="writeHand">'+
                    '<div class="headOfWriteHand">'+
                        '<div class="cancel"><img src="image/goback.png"/></div>'+
                        '<div class="reset"><img src="image/new.png"/></div>'+
                        '<div class="prev"><img src="image/back.png"/></div>'+
                        '<div class="next"><img src="image/go.png"/></div>'+
                        '<div class="save"><img src="image/ok.png"/></div>'+
                    '</div>'+
                    '<div class="mainOfWriteHand" id="mainOfWriteHand">'+
                        '<canvas id="board" class="board">您的浏览器不支持</canvas>'+
                    '</div>'+
                '</div>'+
                '<canvas id="boardNew" class="board" style="display: none;">您的浏览器不支持</canvas>');
    $('body').append(node);
    setWindow();
    onBind();
};

function setWindow(){
    var myWidth = document.documentElement.clientWidth,
        myHeight = document.documentElement.clientHeight;
    
    var board = document.getElementById('board');
    board.width = myWidth * 3;     //gcWidth;
    board.height = myHeight * 2;   //gcHeight;
    
    $('.mainOfWriteHand').width( myWidth );
    $('.mainOfWriteHand').height( myHeight - 50 );
    $('.mainOfWriteHand').scrollLeft( myWidth );
    $('.mainOfWriteHand').scrollTop( myHeight / 2 );
};

function onBind(){
    var board = document.getElementById('board'),
        gc = board.getContext('2d'),   //第一块画布,用来画
        boardNew = document.getElementById('boardNew'),
        gcNew = boardNew.getContext('2d'),   //第二块画布,用来储存.因为toDataURL和getImageData不能同时用.所以专门分了开来
        doc = document.documentElement,
        body = document.body,
        main = document.getElementById('mainOfWriteHand'),
        myWidth = document.documentElement.clientWidth,
        myHeight = document.documentElement.clientHeight;
    
    gc.strokeStyle = 'rgb(0,0,0)';        //第一块画布笔触颜色
    gc.lineWidth = 1;                     //第一块画布笔触像素
    
    var recede = [],      //存放历史笔画数组
        forward = [],     //存放可以反撤销笔画的数组
        currentPath = [], //目前的笔画集合
        currentPoint;     //当前坐标点对象
    
    board.ontouchstart = function(event) {
        forward.length = 0;
        var e = window.event || event, 
            ex = e.touches[0].clientX + ( main && main.scrollLeft || doc && doc.scrollLeft || body && body.scrollLeft || 0), //|| e.pageX,//e.touches[0]获取第一个触点
            ey = e.touches[0].clientY + ( main && main.scrollTop || doc && doc.scrollTop || body && body.scrollTop || 0) - 50,   // || e.pageY,
            startX = ex - this.offsetLeft, startY = ey - this.offsetTop;
            
        var a = e.touches[0].clientX;
        var b = main && main.scrollLeft;
        var c = doc && doc.scrollLeft;
        var d = body && body.scrollLeft;
        var e = ex;
        console.log( a + '||' + b + '||' + c + '||' + d + '||' + e );
        var f = this.offsetLeft;
        var g = startX;
        console.log( f + '||' + g );
            
        currentPoint = {
            "x" : startX,
            "y" : startY
        };
        currentPath.push(currentPoint);
        
        gc.beginPath();
        //丢弃任何当前定义的路径并且开始一条新的路径
        gc.moveTo(startX, startY);
    
      console.log('mobile start');
      //console.log(JSON.stringify(currentPath));
    }

    board.ontouchmove = function(event) {
        var e = window.event || event,
            ex = e.touches[0].clientX + ( main && main.scrollLeft || doc && doc.scrollLeft || body && body.scrollLeft || 0), //|| e.pageX,//e.touches[0]获取第一个触点
            ey = e.touches[0].clientY + ( main && main.scrollTop || doc && doc.scrollTop || body && body.scrollTop || 0) - 50,   // || e.pageY,
            lineX = ex - this.offsetLeft, lineY = ey - this.offsetTop;
    
        if (e.touches[1]) {
            gc.closePath();
            currentPath.length =0;
        } else {
            event.preventDefault();
            gc.lineTo(lineX, lineY);
            gc.stroke();
    
            //记录每一步坐标点
            currentPoint = {
                "x" : lineX,
                "y" : lineY
            };
            currentPath.push(currentPoint);
        };
        //鼠标移出画布和鼠标抬起事件，处理方式相同
        board.ontouchend = board.ontouchcancel = function(event) {
            if (currentPath.length > 2) {//三个像素点以上才放进去
                recede.push(currentPath.slice(0));
            };
            currentPath.length = 0;
            gc.closePath();
            console.log('mobile end');
        };
    };
    
    
    
    var isMouseDown = false;
    
    board.onmousedown = function(event) {
        //console.log('computer start');
        gc.lineWidth = 2;
        forward.length = 0;
        var e = window.event || event,
            ex = ( e.x || e.pageX ) + ( main && main.scrollLeft || doc && doc.scrollLeft || body && body.scrollLeft || 0) ,
            ey = ( e.y || e.pageY ) + ( main && main.scrollTop || doc && doc.scrollTop || body && body.scrollTop || 0) - 50 ,
            startX = ex - this.offsetLeft, startY = ey - this.offsetTop;
        
        //设置鼠标一定按下状态
        isMouseDown = true;
        currentPoint = {
            "x" : startX,
            "y" : startY
        };
        currentPath.push(currentPoint);
        
        gc.beginPath();
        //丢弃任何当前定义的路径并且开始一条新的路径
        gc.moveTo(startX, startY);
    }
    
    board.onmousemove = function(event) {
        var e = window.event || event,
            ex = ( e.x || e.pageX ) + ( main && main.scrollLeft || doc && doc.scrollLeft || body && body.scrollLeft || 0) ,
            ey = ( e.y || e.pageY ) + ( main && main.scrollTop || doc && doc.scrollTop || body && body.scrollTop || 0) - 50 ,
            lineX = ex - this.offsetLeft,
            lineY = ey - this.offsetTop;
        
        if( isMouseDown ){
            gc.lineTo(lineX, lineY);
            gc.stroke();
        
            //记录每一步坐标点
            currentPoint = {
                "x" : lineX,
                "y" : lineY
            };
            currentPath.push(currentPoint);
//            console.log(JSON.stringify(currentPath));
        }else{
            return;
        }
        
        //鼠标移出画布和鼠标抬起事件，处理方式相同
        board.onmouseup = function(event) {
            //console.log('computer end');
            isMouseDown = false;
            if (currentPath.length > 2) {//三个像素点以上才放进去
                recede.push(currentPath.slice(0));
            };
            currentPath.length = 0;
            gc.closePath();
        };
    };
    
    $('body').on('click', '.headOfWriteHand div', function(e) {
        var classN = $(this).attr("class");
        switch(classN) {
            case 'cancel':
                $('.writeHand').hide();
                break;
            case 'reset':
                gc.clearRect(0, 0, board.width, board.height);
                //gc.beginPath();可能会用
                recede.length = 0;   //记得在这里把记录的数组清空
                break;
            case 'prev':
                if (recede.length != 0) {
                    forward.push(recede.pop());
                    gc.clearRect(0, 0, board.width, board.height);
                    if (recede.length > 0) {
                        for (var i = 0; i < recede.length; i++) {
                            gc.beginPath();
                            var currentX = recede[i][0].x, 
                                currentY = recede[i][0].y;
                            gc.moveTo(currentX, currentY);
                            for (var j = 0; j < recede[i].length; j++) {
                                currentX = recede[i][j].x;
                                currentY = recede[i][j].y;
                                gc.lineTo(currentX, currentY);
                                gc.stroke();
                                event.preventDefault();
                            };
                            gc.closePath();
                        };
                    };
                };
                break;
            case 'next':
                if (forward.length != 0) {
                    gc.beginPath();
                    var leng = forward.length - 1;
                    gc.moveTo(forward[leng][0].x, forward[leng][0].y);
    
                    for (var i = 1; i < forward[leng].length; i++) {
                        gc.lineTo(forward[leng][i].x, forward[leng][i].y);
                        gc.stroke();
                        event.preventDefault();
                    };
                    recede.push(forward.pop());
                    gc.closePath();
                }
                break;
            case 'save':
                var smallX, smallY, bigX, bigY;
                if (recede.length) {
                    if (recede[0][0].x > recede[0][1].x) {
                        smallX = recede[0][1].x;
                        bigX = recede[0][0].x;
                    } else {
                        bigX = recede[0][1].x;
                        smallX = recede[0][0].x;
                    };
                    if (recede[0][0].y > recede[0][1].y) {
                        smallY = recede[0][1].y;
                        bigY = recede[0][0].y;
                    } else {
                        bigY = recede[0][1].y;
                        smallY = recede[0][0].y;
                    };
                };
    
                for (var i = 0; i < recede.length; i++) {
                    for (var j = 0; j < recede[i].length; j++) {
                        smallX = (smallX < recede[i][j].x ) ? smallX : recede[i][j].x;
                        bigX = (bigX > recede[i][j].x ) ? bigX : recede[i][j].x;
                        smallY = (smallY < recede[i][j].y ) ? smallY : recede[i][j].y;
                        bigY = (bigY > recede[i][j].y ) ? bigY : recede[i][j].y;
                    };
                };
                var gcWidth = bigX - smallX,
                    gcHeight = bigY - smallY;
    
                var imgData = gc.getImageData(smallX, smallY, gcWidth, gcHeight);
                $('#board').hide();
    
                boardNew.width = gcWidth;
                boardNew.height = gcHeight;
    
                $('#boardNew').show();
                gcNew.putImageData(imgData, 0, 0);
                var image = new Image();
                image.src = boardNew.toDataURL("image/png", 0.5);
                $('.myimg').attr('src', image.src);
                $('.writeHand').hide();
                break;
        }
    });
};

这一版进步的地方在于我加入了电脑端的适配，同时解决了很多不应该出现的第一版中的bug。

当然这一版还有很多问题：

1.手机端卡顿比较明显

2.当用两只手指进行滑动界面时，很快地滑动时，下一次的起点有可能会有一定的偏差，以至于一画就有很长的一条出现。

我会努力，早日做出第一款属于自己的插件~~~~~

查看全文

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原文地址：https://www.cnblogs.com/neuscx/p/5007389.html

手绘板 第二版 欢迎指正~~~~~~

手绘板第二版欢迎指正~~~~~~