display portion of scaled image in div

Question

So I have a script, to which when I provide a image detail and a div size, it calculates a region in the image, and a scale factor in order to show the best area of the image in

Answer 1

Note, Note certain about expected result of values within

{"scale":1.34,"x1":502,"x2":822,"y1":178,"y2":578}

at

"rect("+data.y1+"px,"+data.x2+"px,"+data.y2+"px,"+data.x1+"px)"

?

Utilized

{"scale":1.34,"x1":100,"x2":200,"y1":100,"y2":200};

below. See CanvasRenderingContext2D.drawImage()

Try

var data = {"scale":1.34,"x1":100,"x2":200,"y1":100,"y2":200};
function showImageInDiv(image, data) {   
    $("#iDiv").empty()
    .append("<canvas id=iDivImage width=500px height=400px></canvas>");
    var img = new Image;
    img.onload = function() {
    var canvas = $("#iDivImage");
    var ctx = canvas.get(0).getContext("2d");
    ctx.drawImage(this, data.x1, data.y1, 500, 400, 0, 0, data.x2, data.y2);
    canvas.css("transform", "scale(" + data.scale + ", "+ data.scale +")");
    };
    img.src = image[0].src;    
};

showImageInDiv($("img"), data);

var data = {"scale":1.34,"x1":100,"x2":200,"y1":100,"y2":200};
function showImageInDiv(image, data) {   
    $("#iDiv").empty().append("<canvas id=iDivImage width=500px height=400px></canvas>");
    var img = new Image;
    img.onload = function() {
    var canvas = $("#iDivImage");
    var ctx = canvas.get(0).getContext("2d");
    ctx.drawImage(this, data.x1, data.y1, 500, 400, 0, 0, data.x2, data.y2);
    canvas.css("transform", "scale(" + data.scale + ", "+ data.scale +")");
    };
    img.src = image[0].src;

    //"rect("+data.y1+"px,"+data.x2+"px,"+data.y2+"px,"+data.x1+"px)"

};

showImageInDiv($("img"), data);

#iDiv {
  display:block;
  width:500px;
  height:400px;
}

#iDiv {
  clip-path():
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="iDiv"></div>
<img src="http://lorempixel.com/1536/1024/cats/" />