I need to resize an image that measures 1024x1024 and is segmented into 4 quadrants:
My goal is to reduce the size of this image so that quadrant 2 is 256x256 while masking out or hiding the remaining 3 quadrants, displaying only the desired section on the page. It should look like this:
Is it feasible to achieve this using CSS alone, or will JavaScript be required in the process?
If the browsers you are targeting support the background-size CSS property, you can achieve this effect using only CSS:
.bg {
background-image: url(https://i.sstatic.net/HQaif.jpg);
background-repeat: no-repeat;
background-size: 203%;
background-position: top left;
width: 256px;
height: 256px;
}
To simplify future resizing, consider removing the red keyline between sections and setting the size property to 512px.
Check out this example fiddle for a demonstration.
For more information on background-size, visit this link.
UPDATE: included JavaScript and updated HTML
JS
$(document).ready(function() {
$('#dyna').change(function() {
$('#myBox').attr('class', 'box quad' + $('#dyna').val());
});
});
HTML
<select id="dyna">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>
<div id="myBox" class="box quad1"></div>
<!-- manually change the "quad" class number as needed-->
CSS
.box{
background:url('https://i.sstatic.net/HQaif.jpg');
width:512px;
height:512px;
background-size: 200%;
background-repeat:no-repeat;
}
.quad1{
background-position: 0% 0%;
}
.quad2{
background-position: 100% 0;
}
.quad3{
background-position: 0 100%;
}
.quad4{
background-position: 100% 100%;
}
You can use JavaScript to dynamically change the "quad" class (quad1 to quad4)
View it in action: http://jsfiddle.net/EMKHJ/3/
To showcase a specific part of an image, try setting it as the background of an element and adjusting the background-position: 0px -30px;. Ensure the element's height and width match the desired quadrant size, then shift the quadrant into view with the CSS property background-position.
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