Show only a cropped section of a resized image within a div

I have a script that calculates the best region of an image to display within a specific div size. This calculation is done in PHP and generates a JSON output like this:

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

The image in question has dimensions of 1536px width and 1024px height. The target div for displaying this portion of the image is 500px width and 400px height. Despite verifying the accuracy of the PHP calculations, I'm struggling to visually present this image section within the specified div.

My attempt so far involves the following function:

function showImageInDiv(image,data)
{
    imageSrc = image.attr("src");
    data = JSON.parse(data);
    $('#iDiv').empty().append("<img src='"+imageSrc+"' id='iDivImage'>");
    $("#iDivImage").css({
        "position": "absolute",
        "top":0,
        "left":0,
        "height":data.scale+"%",
        "width":data.scale+"%",
        "clip": "rect("+data.y1+"px,"+data.x2+"px,"+data.y2+"px,"+data.x1+"px)"
    }); 
}

Despite implementing the above code with the use of clip, the rendering of the image region remains incorrect within the div. Since I lack expertise in frontend techniques, I am open to alternative methods such as using background-images if it proves more effective. Any guidance on correcting this issue would be greatly appreciated!

Thank you in advance

javascriptjqueryhtmlcss

Answer №1

Not entirely sure about the expected outcome for the values provided below:

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

when used in the code snippet:

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

What will this result in?

Example used:

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

You can refer to CanvasRenderingContext2D.drawImage() for more information.

Attempt the following:

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/" />

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