1. 程式人生 > >ios手機豎屏拍照旋轉問題

ios手機豎屏拍照旋轉問題

ios拍照上傳經常會出現上傳的圖片被旋轉了,不是我們想要的角度,可以對齊進行調整

<!DOCTYPE html> 
<html> 
<head> 
    <meta charset="utf-8"> 
    <meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no" /> 
    <title>ios手機豎屏拍照旋轉問題</title> 
 	<script src="http://static.wanlianjin.com/data/m/wlcs/js/nocar/jquery-1.7.2.min.js" type="text/javascript" charset="utf-8"></script>
    <script type="text/javascript" src="js/html/exif.js" ></script> 
</head> 
<body> 
    <div style="height: 50px; line-height: 50px;text-align: center;border-bottom: 1px solid #171E28;"> 
            上傳圖片: 
            <input type="file" accept="image/*" id="uploadImage" capture="camera" onchange="selectFileImage(this);" /> 
        </div> 
        <div style="margin-top: 10px;width:400px"> 
            <img alt="preview" src="" id="myImage" style="width:100%"/> 
        </div> 
</body> 
</html> 
<script>
	//uploadImage.js如下:
function selectFileImage(fileObj) { 
    var file = fileObj.files['0']; 
    //圖片方向角 added by lzk 
    var Orientation = null; 
     
    if (file) { 
        console.log("正在上傳,請稍後..."); 
        var rFilter = /^(image\/jpeg|image\/png)$/i; // 檢查圖片格式 
        if (!rFilter.test(file.type)) { 
            //showMyTips("請選擇jpeg、png格式的圖片", false); 
            return; 
        } 
        // var URL = URL || webkitURL; 
        //獲取照片方向角屬性,使用者旋轉控制 
        EXIF.getData(file, function() { 
            EXIF.getAllTags(this);  
            Orientation = EXIF.getTag(this, 'Orientation'); 
            //return; 
        }); 
        var oReader = new FileReader(); 
        oReader.onload = function(e) { 
            //var blob = URL.createObjectURL(file); 
            //_compress(blob, file, basePath); 
            var image = new Image(); 
            image.src = e.target.result; 
            image.onload = function() { 
                var expectWidth = this.naturalWidth; 
                var expectHeight = this.naturalHeight; 
                 
                if (this.naturalWidth > this.naturalHeight && this.naturalWidth > 800) { 
                    expectWidth = 800; 
                    expectHeight = expectWidth * this.naturalHeight / this.naturalWidth; 
                } else if (this.naturalHeight > this.naturalWidth && this.naturalHeight > 1200) { 
                    expectHeight = 1200; 
                    expectWidth = expectHeight * this.naturalWidth / this.naturalHeight; 
                } 
                var canvas = document.createElement("canvas"); 
                var ctx = canvas.getContext("2d"); 
                canvas.width = expectWidth; 
                canvas.height = expectHeight; 
                ctx.drawImage(this, 0, 0, expectWidth, expectHeight); 
                var base64 = null; 
                //修復ios 
                if (navigator.userAgent.match(/iphone/i)) { 
                    console.log('iphone'); 
                    //alert(expectWidth + ',' + expectHeight); 
                    //如果方向角不為1,都需要進行旋轉 added by lzk 
                    if(Orientation != "" && Orientation != 1){ 
                        alert('旋轉處理'); 
                        switch(Orientation){ 
                            case 6://需要順時針(向左)90度旋轉 
                                alert('需要順時針(向左)90度旋轉'); 
                                rotateImg(this,'left',canvas); 
                                break; 
                            case 8://需要逆時針(向右)90度旋轉 
                                alert('需要順時針(向右)90度旋轉'); 
                                rotateImg(this,'right',canvas); 
                                break; 
                            case 3://需要180度旋轉 
                                alert('需要180度旋轉'); 
                                rotateImg(this,'right',canvas);//轉兩次 
                                rotateImg(this,'right',canvas); 
                                break; 
                        }        
                    } 
                     
                    /*var mpImg = new MegaPixImage(image); 
                    mpImg.render(canvas, { 
                        maxWidth: 800, 
                        maxHeight: 1200, 
                        quality: 0.8, 
                        orientation: 8 
                    });*/ 
                    base64 = canvas.toDataURL("image/jpeg", 0.8); 
                }else if (navigator.userAgent.match(/Android/i)) {// 修復android 
                    alert(Orientation)
                    var encoder = new JPEGEncoder(); 
                    base64 = encoder.encode(ctx.getImageData(0, 0, expectWidth, expectHeight), 80); 
                }else{ 
                    //alert(Orientation); 
                    if(Orientation != "" && Orientation != 1){ 
                        //alert('旋轉處理'); 
                        switch(Orientation){ 
                            case 6://需要順時針(向左)90度旋轉 
                                alert('需要順時針(向左)90度旋轉'); 
                                rotateImg(this,'left',canvas); 
                                break; 
                            case 8://需要逆時針(向右)90度旋轉 
                                alert('需要順時針(向右)90度旋轉'); 
                                rotateImg(this,'right',canvas); 
                                break; 
                            case 3://需要180度旋轉 
                                alert('需要180度旋轉'); 
                                rotateImg(this,'right',canvas);//轉兩次 
                                rotateImg(this,'right',canvas); 
                                break; 
                        }        
                    } 
                    base64 = canvas.toDataURL("image/jpeg", 0.8); 
                } 
                //uploadImage(base64); 
                $("#myImage").attr("src", base64); 
            }; 
        }; 
        oReader.readAsDataURL(file); 
    } 
} 
 
//對圖片旋轉處理 added by lzk www.bcty365.com 
function rotateImg(img, direction,canvas) {   
        //alert(img); 
        //最小與最大旋轉方向,圖片旋轉4次後回到原方向   
        var min_step = 0;   
        var max_step = 3;   
        //var img = document.getElementById(pid);   
        if (img == null)return;   
        //img的高度和寬度不能在img元素隱藏後獲取,否則會出錯   
        var height = img.height;   
        var width = img.width;   
        //var step = img.getAttribute('step');   
        var step = 2;   
        if (step == null) {   
            step = min_step;   
        }   
        if (direction == 'right') {   
            step++;   
            //旋轉到原位置,即超過最大值   
            step > max_step && (step = min_step);   
        } else {   
            step--;   
            step < min_step && (step = max_step);   
        }   
        //img.setAttribute('step', step);   
        /*var canvas = document.getElementById('pic_' + pid);   
        if (canvas == null) {   
            img.style.display = 'none';   
            canvas = document.createElement('canvas');   
            canvas.setAttribute('id', 'pic_' + pid);   
            img.parentNode.appendChild(canvas);   
        }  */ 
        //旋轉角度以弧度值為引數   
        var degree = step * 90 * Math.PI / 180;   
        var ctx = canvas.getContext('2d');   
        switch (step) {   
            case 0:   
                canvas.width = width;   
                canvas.height = height;   
                ctx.drawImage(img, 0, 0);   
                break;   
            case 1:   
                canvas.width = height;   
                canvas.height = width;   
                ctx.rotate(degree);   
                ctx.drawImage(img, 0, -height);   
                break;   
            case 2:   
                canvas.width = width;   
                canvas.height = height;   
                ctx.rotate(degree);   
                ctx.drawImage(img, -width, -height);   
                break;   
            case 3:   
                canvas.width = height;   
                canvas.height = width;   
                ctx.rotate(degree);   
                ctx.drawImage(img, -width, 0);   
                break;   
        }   
    }   
</script>

git地址:https://github.com/zhangstar1331/upload-picture.git