How do I get the shape / polygon / bounding path / frame of an element in HTML?
In jQuery, zepto.js
etc. you can say
var position = $('a:first').position();
But a-tag can span multiple lines with a more complex shape than a simple rectangle (position and size). What I would like to get is the element path.
Example
The pipes in this examples is meant to illude |||||||
|||||| |||| || ||||||| an a-tag spanning over two lines.
Consisting of two different rects OR 8 different points.
So, is there a way to get the polygon of any element?
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1 answer
http://jsfiddle.net/mattdlockyer/EEVV2/
This will give you the endpoints of each link line.
Since the construction of the polywill will depend on the shape, I really didn't have time for this, but I think this is a reasonable starting point.
Hope it helps!
$(document).ready(function () {
var words = $('a').text().split(' '); //break the link words into array
for (var i = 0; i < words.length; ++i) {
words[i] = '<span>' + words[i] + '</span> '; //wrap each word in a span
}
words.join(' '); //join the words
$('a').html(words); //replace the link html with the words wrapped in spans
var points = []; //to store our points
var lastIndex = $('a span').length - 1; //so we know we've hit the last point
var first; //keep track of first point
$('a span').each(function (i) {
var pos = $(this).position();
if (i > 0) {
if (i != lastIndex) {
if (points[points.length - 1].top < pos.top) { //have we hit a new line?
var newPos = $($('a span')[i - 1]).position();
if (newPos.left != first.left) { //check if we are on the right side of the object
newPos.left += $($('a span')[i - 1]).width(); //add the width of the word
points.push(newPos); //push this point
} else {
points.push(newPos); //we are on the left side, push the point without the width of the word
}
//$($('a span')[i - 1]).addClass('red'); //useful for debugging
}
} else {
var bottomLineHeight = $(this).height();
pos.left += $(this).width(); //add width to last point
pos.top += bottomLineHeight; //add height to last point, push later
points[points.length - 1].top += bottomLineHeight; //add height to second to last point
points.push(pos); //push last point
}
} else {
points.push(pos); //push first point
first = pos; //keep track of topLeft point (first)
}
});
//for printing out points
var html = '';
$(points).each(function (i, obj) {
html += '<p>(' + obj.left + ', ' + obj.top + ')';
});
$('#result').html(html);
});//ready
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