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corner-shape.js
162 lines (125 loc) · 3.55 KB
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corner-shape.js
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function $(expr, con) { return (con || document).querySelector(expr); }
function $$(expr, con) { return [].slice.call((con || document).querySelectorAll(expr)); }
// Make each ID a global variable
// Many browsers do this anyway (it’s in the HTML5 spec), so it ensures consistency
$$('[id]').forEach(function(element) {
window[element.id.replace(/-(.)/g, function ($0, $1) { return $1.toUpperCase() })] = element;
});
var svg = $('svg'),
path = $('path');
function update() {
// Apply values to fallback
fallback.style.borderRadius = borderRadius.value;
fallback.style.width = width.value;
fallback.style.height = height.value;
// Make SVG
var cs = getComputedStyle(fallback);
var r = [];
var w = fallback.offsetWidth,
h = fallback.offsetHeight;
svg.setAttribute('width', w);
svg.setAttribute('height', h);
// Build 2D array with corner radii, resolve % to px
['TopLeft', 'TopRight', 'BottomRight', 'BottomLeft'].forEach(function(corner, i) {
var values = cs['border' + corner + 'Radius'].split(/\s+/);
if (values.length == 1) {
values[1] = values[0];
}
values[0] = parseFloat(values[0]) * (values[0].indexOf('%') > -1? w / 100 : 1);
values[1] = parseFloat(values[1]) * (values[1].indexOf('%') > -1? h / 100 : 1);
if (values[0] === 0) {
values[1] = 0;
}
if (values[1] === 0) {
values[0] = 0;
}
r[i] = values;
});
// Shrink overlapping curves
var ratio = [1,1];
for (var i=0; i<r.length; i++) {
var radii = r[i],
radiiAdj = r[i + (i % 2? -1 : 1)];
ratio[0] = Math.min(
ratio[0],
w / (radii[0] + radiiAdj[0])
);
}
for (var i=0; i<r.length; i++) {
var radii = r[i],
radiiAdj = r[(i % 2? i+5 : i+3) % 4];
ratio[1] = Math.min(
ratio[1],
h / (radii[1] + radiiAdj[1])
);
}
if (ratio[0] < 1 || ratio[1] < 1) {
for (var i=0; i<r.length; i++) {
r[i][0] *= ratio[0];
r[i][1] *= ratio[1];
}
}
var shape = cornerShape.value;
var d = ['M', r[0][0], '0'];
d.push('h', w - r[0][0] - r[1][0]);
drawCorner(0, shape, w, h, r[1], d);
d.push('v', h - r[1][1] - r[2][1]);
drawCorner(1, shape, w, h, r[2], d);
d.push('h', -w + r[2][0] + r[3][0]);
drawCorner(2, shape, w, h, r[3], d);
d.push('v', -h + r[3][1] + r[0][1]);
drawCorner(3, shape, w, h, r[0], d);
d.push('Z');
path.setAttribute('d', d.join(' '));
}
function drawCorner(corner, shape, w, h, r, d) {
if (shape == 'notch') {
switch (corner) {
case 0:
d.push('v', r[1], 'h', r[0]);
break;
case 1:
d.push('h', -r[0], 'v', r[1]);
break;
case 2:
d.push('v', -r[1], 'h', -r[0]);
break;
case 3:
d.push('h', r[0], 'v', -r[1]);
}
}
else {
if (shape == 'curve' || shape == 'scoop') {
var sweep = +(shape == 'curve');
d.push('a', r[0], r[1], '0', 0, sweep);
}
else if (shape == 'bevel') {
d.push('l');
}
d.push(corner == 1 || corner == 2? -r[0] : r[0]);
d.push(corner == 2 || corner == 3? -r[1] : r[1]);
}
}
cornerShape.onchange = update;
(function(){
var test = document.createElement('div')
test.style.width = '1ch';
var supportsCh = !!test.style.width;
if (!supportsCh) {
test.style.position = 'absolute';
test.textContent = '0';
code.appendChild(test);
var chEmRatio = test.offsetWidth / parseFloat(getComputedStyle(test).fontSize);
code.removeChild(test);
}
window.pxToCh = function (px) {
return supportsCh? px + 'ch' : px * chEmRatio + 'em';
};
})();
$$('input').forEach(function(input) {
new Incrementable(input);
(input.oninput = function() {
input.style.width = pxToCh(input.value.length);
update();
})();
});