IMG Cropped Upload

by Matheus Stein

HTML

<div class="container">

  <p class="title">
    IMG Cropped Upload
  </p>

  <p class="label">
    01. Select your image
  </p>
  
  <input type="file" class="input" id="file" name="image" accept="image/*"/>
  
  <div id="cropOptions">
  
    <p class="label">
      02. Select Crop Style
    </p>
    
    <div class="buttonHolder">
      <span class="buttonOption" onClick="styleExpand()">Expand</span>
      <span class="buttonOption btSelected" onClick="styleCrop()">Crop</span>
      <span class="buttonOption" onClick="styleContain()">Contain</span>
    </div>
    
    <p class="label">
      Result:
    </p>
    
    <canvas id="canvas"></canvas><br>
    
    <span class="button" onClick="exportCanvas()">Upload</span>
  
  </div>
  
  <p class="label">
      By. Matheus Stein
    </p>
  
</div>

CSS

@import url('https://fonts.googleapis.com/css?family=Ubuntu+Mono:400,700');
body {
  background: #20262e;
  font-family: 'Ubuntu Mono', monospace;
  color: #beccdd;
  font-size: 14px;
  margin: 0
}

#iframeHold {
  display: none
}

.container {
  width: 400px;
  margin-left: calc( 50vw - 230px);
  margin-top: 60px;
  margin-bottom: 60px;
  background: #292f36;
  padding: 30px;
  border-radius: 4px;
  box-shadow: 0 3px 3px 0px rgba(0, 0, 0, 0.3);
}

hr {
  margin-top: 24px;
  margin-bottom: 24px;
  border: 0.5px solid #beccdd;
}

.title {font-weight:bold}

textarea {
  width: 376px;
  min-height: 84px;
  border: 0;
  background: #494d54;
  resize: none;
  color: #beccdd;
  padding: 12px;
  border-radius: 4px;
  box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.2)
}

input {
  font-family: 'Ubuntu Mono', monospace;
  width: 376px;
  border: 0;
  background: #494d54;
  resize: none;
  color: #beccdd;
  padding: 12px;
  border-radius: 4px;
  box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.2)
}

.button {
  display: inline-block;
  padding: 12px 24px;
  background: #30cbff;
  border-radius: 2px;
  color: #20262e;
  font-weight: bold;
  margin-right: 8px;
  margin-top: 24px;
  cursor: pointer;
  transition: all 0.2s;
}

.buttonOption {
  display:inline-block;
  background: #494d54;
  color: #beccdd;
  padding: 12px;
  box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.2);
  float:left;
  cursor:pointer;
}

.buttonOption:nth-child(1) {
  border-radius:4px 0 0 4px;
}
.buttonOption:nth-child(3) {
  border-radius:0px 4px 4px 0px;
}

.btSelected {
  background: #292f36;
  color: #beccdd;
  box-shadow: inset 0 1px 3px 1px rgba(0, 0, 0, 0.5);
}

.buttonHolder {
  display:inline-block;
  width:100%;
}

#cropOptions {
  display:none;
}

.copy {
  position: fixed;
  top: 16px;
  left: 16px;
  padding: 8px;
  background: rgba(0, 0, 0, 0.5);
  border-radius: 4px;
  transition: all 0.3s;
  opacity: 0;
}

.on {
  opacity: 1;
}

#canvas {
  border:1px solid rgba(0,0,0,0.4);
  box-shadow: 0 2px 2px 0 rgba(0, 0,...

JavaScript

// Choose destination size
var destWidth=200;
var destHeight=100;

document.getElementById('file').onchange = function(e) {
  img = new Image();
  img.onload = draw;
  img.onerror = failed;
  img.src = URL.createObjectURL(this.files[0]);
};
function draw() {
  canvas = document.getElementById('canvas');
  canvas.width = destWidth;
  canvas.height = destHeight;
  ctx = canvas.getContext('2d');
  //ctx.drawImage(this, 0,0);
  document.getElementById('cropOptions').style.display = "block";
  styleCrop();
}
function failed() {
  console.error("The provided file couldn't be loaded as an Image media");
}

function styleExpand() {
	document.getElementsByClassName('buttonOption')[0].className = "buttonOption btSelected";
  document.getElementsByClassName('buttonOption')[1].className = "buttonOption";
  document.getElementsByClassName('buttonOption')[2].className = "buttonOption";

	ctx.clearRect(0, 0, canvas.width, canvas.height);
  
	ctx.drawImage(img, 0, 0, destWidth, destHeight)
}

function styleCrop() {
	document.getElementsByClassName('buttonOption')[0].className = "buttonOption";
  document.getElementsByClassName('buttonOption')[1].className = "buttonOption btSelected";
  document.getElementsByClassName('buttonOption')[2].className = "buttonOption";

	ctx.clearRect(0, 0, canvas.width, canvas.height);	
  
	var aspectDest = destWidth/destHeight;
  var aspectImg = img.width/img.height;
  
  if (aspectImg>aspectDest) {
    var scale=destHeight/img.height;
    var sH=img.height*scale;
    var sW=img.width*scale;
    var sX=-((sW-destWidth)/2);
    ctx.drawImage(img, sX, 0, sW, sH);
   }
   else {
   	var scale=destWidth/img.width;
    var sH=img.height*scale;
    var sW=img.width*scale;
    var sY=-((sH-destHeight)/2);
    ctx.drawImage(img, 0, sY, sW, sH);
  }
}

function styleContain() {
	document.getElementsByClassName('buttonOption')[0].className = "buttonOption";
  document.getElementsByClassName('buttonOption')[1].className = "buttonOption";
 ...