Javascript işlevi Temel 64 görüntüyü X derece döndürür ve yeni base64 döndürür64

Question

Bir base64 görüntüsünü X derece döndürecek ve yeni base64 görüntüsünü döndürecek bir javascript işlevi istiyorum.

Örnek I gibi bir şey ile bir işlevi çağırmak istiyorsunuz:

var newImg = rotateImg (imageData, 90); // 90 derece döndürülmüş orijinal görüntünün base64 dizesini döndürmelidir.

(altta Numune base64 görüntü dizesi)

İdeal olarak, fonksiyon dışı html5 tarayıcılar ile geriye doğru uyumlu olacak, ama saf tuval çözümleri basitlik için açıktır.

Günlerce bununla mücadele ediyorum.

Çözümün büyük olasılıkla olacağını, bir resim nesnesini orijinal dizeyle yüklediğini, bir geçici tuval nesnesini ve bağlamı oluşturduğunu, sonra da bağlamı döndürdüğünü, ardından tuvali görüntü dizisine dönüştürdüğünü, ancak yalnızca çalışmasını sağlayabileceğini anlıyorum. .. Lütfen yardım et!!

Örnek görüntü dizisi:

veriler: görüntü/PNG; base64, iVBORw0KGgoAAAANSUhEUgAAACIAAABBCAMAAACD + YYEAAAABGdBTUEAALGPC/xhBQAAAwBQTFRFpI8jl5FIn5V0paijNzAfJiIavsHNlpabcnB6iH0XZ2Z4gH6BnJM2paSHu7NVoqGdoi8pRDwnnz40vrl4qJtgpqKNg3pRoJBL8 + UJPj08nJeCNCkQhWgG5erh0q2RxcnKyYcT8POb391VRTAE +/rqzsqsqZ8xsaBa38sVgXU0jI6SpKKUdlpLk4VEfXAcjId2UFBMo5tc5bwCdX6noJtzwLIkkYAvmI5fu61GfnlMjn4Y39gPeXJVlY99gYKNb19afnli186St58T0cUPV09Azb8fX1w/nJqdp5s3dGtHMzhLGRcex8Fk4tZspoYSdnNxpKBxko51tKRg5d6Ig4B1181vX2BgFxEQWFE8W1dDiYuVdG5l5NQyraqZa2lmamppY15AgH5shYN8d3NocG1feXhyAAAA15Bry6847fPEPEWJv0E28 + ZTw76K/txB3cpM3NvAkpKecVsJjouKXGKJ9 + Io7ezNnqGts69tf3pT9vOt/vYY9d46/uwVHx0mZm6hv6AmmZJh8uWS5t6jYWd78e2RVEQQ7 + qzCQ9JsrCY7dlNVVVapZIq/PMw1rkI7eVzxrgM 7u4Ih24lg30UYl0krp5HnpqI0sdhzKEM3tWEj4tp7uiE69dY3MEKxsB6 // 2zz8JRKjBW/fdZXlpFua0O/TSM/9IB/+ 5oLB0B/O0D // 7cxq8h8t4DSk9sBgII7NkL // Q'yu // lH4MMlPzgm/vCq/ODH/vJ4lY4XNjIu1c99IiM0 // zi/uAMVlpuenp1 // 5wvbFJISRE // yE9dQFTkk6REA3NjU5s5oimY5J/+ Ag0bAF + dwCqpwN7s8FWVlX // yaEhE2FhQpMysgQEVamH8V + OCC // yoU1NS18Ay/VQ7/+ 2aEw4d/+ yP/+ uGdHqZamxwHhkZ5c4E/+ E5DAshBAMY/+ AV/+ NPSkpMGRcf/+ h9/+ Vm/+ At/9YBLSss/+ dy/+ ZaLy0y/vQCJyUn/+ JFAwMlOjk5QEBG/+ UAKCUg/FSA/+ 0BJCEgIh4e/+ AB/9oA/9wA1H7CggAAAGd0Uk5T4vLQweDsx83XzcXoyNrZx/LL4NeTbrKm/vHL8f38/vH9/vv7/v3Vs/2JmryxXKtd5cn8/P7V + YLKb/v9gmv + npv +/vpj5ktDs/398/j +/k + 8mf7 + EF7 +/rQhLir9FTMVij8iCQ8DAMXyiFIAAAZySURBVEjHhdYHUBNZGABg5 + 68fmdX7AVRKYeKgAIK0osUaSIQKSmevfcCWCgCgkqvgiC9SS/SqxRpoWNIDCVIkUAKCSn3djcLnufM/TOb2cl88 // v7fv3vV108n9j0cItHou1dQRhY2ODxX2D4KxtLUyPwiEtLS1lYWKN + 4rgdCT1/jSMigqytCwoUFeX2PyjlA7 + XwSvJauNwWRmYjzDfX3DzM1D3Ldv/EKL/wXB6cjIR2GaKOn3zn0adb1zx/1RyKNLm3/Wsp8nBDu1fTfNIppS7ufET37o7SxK2n5D3SyQ9KsJDiVYi98uy7tQOrhDM58nR/t7s3uAiXxwVVUKKyI4k9/LopIjGtj812PDnyY/wCbpUeR5iT92E0RESft5uk8TXyh4/S4nPhci2UVJ7pbmPeqmeIRgD6twKPVNbC6Xc/dNaWlFRnPny54id0vLzq1HbRFiqyfWUe/TwaFzOM8x27YZ + Zpv7QQopCyseYUJASaOO8QoPimc588a/FZ8/f2rYvRDbxW4doZFGVUYKuEhQvhLgd/U1KHi5zZLYwxCQW1lxjwIyQ0Pz7XcLyLaiYKGZ1d4DAaD1kft63MqLCwsby8x9Lz3ymg/Di4ECKXRjcpgtPJmQUxPMKtZrPbiErPup9tWooStkdXSSiPPzc7x5gCpYY68P/aYpBpwHSPK4qjAJ7Z4TLXxeHM8cE1PTDFZXccG9u17kK6phBNNutK43IOZTybz5kDAZOQ9IAEUBR1k0jZr5IKrylnMaTIZJtMIIV0 + JadnBz06AnbVAbl6/WjWSA0PToMWcg7sllOwwBJOLsIr7dCsD37R3t41MgEGOzc7kQ + GCwgp0CX42Q4le0C0flFWNlb0an/vVUOzooFwmoJmNECSN96guEPSGhSy1nFYtkGxODU11WAwLQ1 + uoVTrJFikhlRXG23HR5uBt1lV + qunUkt7spvy8 + qrqqqrmYxWakksw3rtfDIjE7q/uDmHVpSF1BWVmZoCN6AyPNPAkNVLwdcWW9xQtSYqxYnaGBUVO4 + ffOqtKKiGWqXntMbL5W5kQ + LCM4CEDqHfh + QeNB1SEttTwoSt0IJ/uARq0YOnT80dmH486fJ0Q/9/b292UVFF8XT1LALxJhOF7weuzADEcQUvewWTzuOEocjfcZcLmjujzPD86an + VRC2nHbBUJM5AqFQ2OIAbU + 9PZk1CYMogTncIRK7OAKBHzUjI6O9ndW1CZQF8hsH5ELkbdIKThPcy5ErBFi7zAHCF0oEKJpIJNR6tJGQ7NARLmBCwg6nM + gWMar5Kzp43YEdLitLyrZQoEAyvNubGZmGGTKfaORNXHcDs0y3QIIHwghH4wHJAKZ4nNq88sXCi1uedHEhgvxEQNVu1dbbSAjGu6J g8xCIlIIVm + HoEQ51zWqDOYXwGJtjbeQLUACLjY0NDZ2PzmGdVhEcIfWMmv5CwQpN8TdpT + CEsKhPdW148JxwRdIyG9g77rtZYq21O49VS5x4yDAz7xraNC8fewLEpPMZwvH4 + LGYSkYjxOw2Q3dofMEFNLP5HPpXC642Hw29MtOZDdg5AcWuk6/LRO + UTPxOQcEHbo6xHYlZ3pG1q2ebynFskziVLVfXl5eY + yz2NjGvDzFuhIzo4JaWdEC4CWJ3UPKHh7lLVTabFtb28RUeXT7NedAc6NkWfTprtGgcL2jo1ktYCtjUKmMlvLo4sekJw/DY/VEa2SzM7iS6w3e + ywymeYE3vspVtdAieqTh571ejYoqa/8WNee2jVBhja7aeith0lOxAFdpF + WO + Veh8sXF3fxrOD9ZaoG2l5IN9VzKlFiv7KJf/Gq80CVaJdCdiDSzcic6/NEche3W9X5Wr4VGd5UQZaR949JVw1fndsrmjTuoCYnoo50piWtzwnZyGoM2h + XPAgq9V1thy6ANicxIkC/dZABz7q1tdDAK/RWUFizuam9aBl1D1A6Uij1RP + sNh6N2teaH3P7lqW5a/bDFYdwInJiv/GWYB9KOkUztrExT7nOzNIobKv5pr/NTG0I6Alro7b07BaV9BR4CZ ++ AafWndObzi6VWTg + oSN2 + ZYUMUp6SiIdHGwVro9ubNy0XMYE/8VRTsBqySpgukFgLhqFqEtIXNosbWGH +/qbQWf/zr0gvlu3bt2SJd9LOdoT/vvlYW8HfXeYOMKBJXzr4 + Qk/C + BMH8rin8A/Bof4kY + PtwAAAAASUVORK5CIIA =

Answer 1

İşte kod

<html> 
<head> 

</head> 
<body> 
<canvas id="c"/> 
</body> 
<script> 
function rotateBase64Image(base64data, callback) { 
    var canvas = document.getElementById("c"); 
    var ctx = canvas.getContext("2d"); 

    var image = new Image(); 
    image.src = base64data; 
    image.onload = function() { 
     ctx.translate(image.width, image.height); 
     ctx.rotate(180 * Math.PI/180); 
     ctx.drawImage(image, 0, 0); 
     window.eval(""+callback+"('"+canvas.toDataURL()+"')"); 
    }; 

} 
rotateBase64Image("data:image/png;base64,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", 'callback'); 
function callback(base64data) { 
    console.log(base64data); 
} 
</script> 
</html> 

Answer 2

ben biraz büyük genelleştirilmiş yöntemi, herhangi bir bağımlılıkları saat yönünde olmadan yukarıdaki base64Image dize dönüştürmek veya çalışmış saat yönünün

 /** 
     * Rotates base64 image string iether 
     * clockwise or counterclockwise 
     * 
     * @param isClockwise - true or false 
     * 
     * WARNING!!! Method not null save - assumes all input data are valid 
     */ 
     function rotateBase64Image90deg(base64Image, isClockwise) { 
      // create an off-screen canvas 
      var offScreenCanvas = document.createElement('canvas'); 
      offScreenCanvasCtx = offScreenCanvas.getContext('2d'); 

      // cteate Image 
      var img = new Image(); 
      img.src = base64Image; 

      // set its dimension to rotated size 
      offScreenCanvas.height = img.width; 
      offScreenCanvas.width = img.height; 

      // rotate and draw source image into the off-screen canvas: 
      if (isClockwise) { 
       offScreenCanvasCtx.rotate(90 * Math.PI/180); 
       offScreenCanvasCtx.translate(0, -offScreenCanvas.width); 
      } else { 
       offScreenCanvasCtx.rotate(-90 * Math.PI/180); 
       offScreenCanvasCtx.translate(-offScreenCanvas.height, 0); 
      } 
      offScreenCanvasCtx.drawImage(img, 0, 0); 

      // encode image to data-uri with base64 
      return offScreenCanvas.toDataURL("image/jpeg", 100); 
     }