I have an SVG element called rect that has the following attributes:
<rect x="50" y="10" width="20" height="30" style="stroke: #000000; fill:none;" />
After applying a transformation of skewX(10), the dimensions of the rectangle are altered. How can I calculate its actual width and height using plain JavaScript (without any external libraries)?
Enclose the <rect> within a <g> element, then obtain a reference to the group, and finally invoke getBBox() on it.
var bbox = document.getElementById("wrapper").getBBox();
alert("width=" + bbox.width + " height=" + bbox.height);<svg>
<g id="wrapper">
<rect x="50" y="10" width="20" height="30" style="stroke: #000000; fill:none;"
transform="skewX(10)" />
</g>
</svg>The rationale for wrapping the element in a group is that the bounding box provided by getBBox() does not account for the transformation effects. It doesn't necessarily have to be a <g>; any parent of the <rect> would suffice as long no other child elements impact the boundaries.
Alternatively, you could utilize trigonometry as suggested by Stephen.
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