Create kute-svg.js

This commit is contained in:
thednp 2016-02-18 20:46:32 +02:00
parent 9fa0b5a328
commit a6534763af

859
src/tmp/kute-svg.js Normal file
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(function (factory) {
if (typeof define === 'function' && define.amd) {
define(["./kute.js"], function(KUTE){ factory(KUTE); return KUTE; });
} else if(typeof module == "object" && typeof require == "function") {
// We assume, that require() is sync.
var KUTE = require("./kute.js");
// Export the modified one. Not really required, but convenient.
module.exports = factory(KUTE);
} else if ( typeof window.KUTE !== 'undefined' ) {
// Browser globals
window.KUTE.svg = window.KUTE.svg || factory(KUTE);
} else {
throw new Error("SVG Plugin require KUTE.js.");
}
}( function (KUTE) {
'use strict';
var K = window.KUTE, S = S || {},
p2s=/,?([a-z]),?/gi,
_unl = ['strokeWidth', 'strokeOpacity', 'fillOpacity', 'stopOpacity'], // unitless SVG props;
_cls = ['fill', 'stroke', 'stopColor']; // colors 'hex', 'rgb', 'rgba' -- #fff / rgb(0,0,0) / rgba(0,0,0,0)
// get path
S.getPath = function(e){
var p = {}, el = typeof e === 'object' ? e : /^\.|^\#/.test(e) ? document.querySelector(e) : null;
if ( el && /path|glyph/.test(el.tagName) ) {
p.e = el;
p.o = el.getAttribute('d');
} else if (!el && /m|z|c|l|v|q|[0-9]|\,/gi.test(e)) { // maybe it's a string path already
el = document.querySelector('[d="'+e+'"]');
var newp = document.createElement('path');
newp.setAttribute('d',e);
p.e = el || newp;
p.o = e;
}
return p;
}
// process path now
S.pathCross = function(w){
var o1 = w._vS.path.o, o2 = w._vE.path.o,
p1 = pathMulti(o1), p2 = pathMulti(o2), t, b1, b2;
w._vS.path.d = {}; w._vE.path.d = {};
if ( typeof p1 === 'object' || typeof p2 === 'object' ) {
if (typeof p1 === 'object' && typeof p2 === 'string') {
t = clone(p2); p2 = {}; b2 = curvePathBBox(path2curve(t));
for (var i in p1) {
// if (i*1 === 0) {
p2[i] = t;
// } else {
// p2[i] = (i*1) % 2 ? 'M'+b2.cx+' '+b2.cy+ +'l0 0' : 'M'+b2.x+' '+b2.y +'l0 0';
// }
}
} else if (typeof p1 === 'string' && typeof p2 === 'object') {
t = clone(p1); p1 = {}; b1 = curvePathBBox(path2curve(t));
for (var i in p2) {
// if (i*1 === 0) {
p1[i] = t; // perhaps in the future do something about the corresponding shape
// } else {
// p1[i] = (i*1) % 2 ? 'M'+b1.cx+' '+b1.cy+ +'l0 0' : 'M'+b1.x+' '+b1.y +'l0 0';
// }
}
} else if (typeof p1 === 'object' && typeof p2 === 'object') {
var pl1 = oKeys(p1).length, pl2 = oKeys(p2).length, s1, s2;
if (pl1 > pl2) {
for (var i in p1){
if (!(i in p2)) {
s2 = getBSBox(p2,i);
b2 = curvePathBBox(path2curve(p2[s2]));
// p2[i] = p2[s2]; // or get the biggest/smalles shape
p2[i] = (i*1) % 2 ? 'M'+b2.cx+' '+b2.cy+ +'l0 0' : 'M'+b2.x+' '+b2.y +'l0 0';
}
}
} else if (pl1<pl2) {
for (var i in p2){
if (!(i in p1)) {
s1 = getBSBox(p1,i);
b1 = curvePathBBox(path2curve(p1[s1]));
// p1[i] = p1[s1]; // or get the biggest/smallest shape
p1[i] = (i*1) % 2 ? 'M'+b1.cx+' '+b1.cy+ +'l0 0' : 'M'+b1.x+' '+b1.y +'l0 0';
}
}
}
}
for (var j in p1) {
w._vS.path.d[j] = path2curve(p1[j],p2[j])[0];
w._vE.path.d[j] = path2curve(p1[j],p2[j])[1];
}
} else { // we do some single path shapes
// w._vS.path = w._vE.path = [];
w._vS.path.d = path2curve(p1,p2)[0];
w._vE.path.d = path2curve(p1,p2)[1];
}
}
function getBSBox(c,i) {
if (typeof c === 'object'){
var s = [];
for (var i in c){
var bb = curvePathBBox(path2curve(c[i]));
s.push(bb.w+bb.h);
}
if ( i*1 % 2 ) {
return s.indexOf(Math.min.apply(null, s)).toString();
} else {
return s.indexOf(Math.max.apply(null, s)).toString();
}
}
}
function oKeys(o){
var k = [], p;
if (!Object.keys) {
for (p in o) { k.push(p); }
return k;
} else {
return Object.keys(o);
}
}
function random(m,M) {
return Math.floor(Math.random() * (M - m + 1)) + m;
}
function pathMulti(p){
var a = p.split(/z/i), path;
if (a.length > 2) {
for (var i = 0; i< a.length; i++) { trm(a[i].replace(/\n/,'')); if ( !/[0-9a-z]/gi.test(a[i]) ) { a.splice(i,1) } }
path = {};
for (var i=0, l=a.length; i<l; i++) { path[i] = a[i] + 'z'; }
} else { path = trm(p); }
return path;
}
function trm(s){
if (!String.prototype.trim) {
return s.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, '');
} else { return s.trim(); }
}
// register the render SVG path object
// process attributes object K.pa(t[x]) and also register their render functions
K.pp.path = function(a,o){
if (!('path' in K.dom)) {
K.dom['path'] = function(w,p,v){
var curves = [], curve =[], i, l, str='', tp = tp || typeof w._vE.path.d[0][0] === 'object';
if (tp){ // we process multipath first
for(i in w._vE.path.d) { // each parent path
curves[i] = [];
for ( var k = 0, l2 = w._vE.path.d[i].length; k < l2; k++){ // each path
curves[i][k] = [];
curves[i][k].push([w._vS.path.d[i][k][0]]);
for(var j=1,l3=w._vE.path.d[i][k].length;j<l3;j++) { // each point
curves[i][k].push(w._vS.path.d[i][k][j]+(w._vE.path.d[i][k][j]-w._vS.path.d[i][k][j])*v);
}
curves[i].push('z');
}
str += S.path2string(curves[i]);
}
w._el.setAttribute("d", v === 1 ? w._vE.path.o : str);
} else {
for(i=0,l=w._vE.path.d.length;i<l;i++) { //
curve.push([w._vS.path.d[i][0]]);
for(var j=1,l2=w._vS.path.d[i].length;j<l2;j++) { // each point
curve[i].push(w._vS.path.d[i][j]+(w._vE.path.d[i][j]-w._vS.path.d[i][j])*v);
}
}
curve.push('z');
w._el.setAttribute("d", v === 1 ? w._vE.path.o : S.path2string(curve) );
}
}
}
return S.getPath(o);
}
function closestPoint(pathNode, point) {
var pathLength = pathNode.getTotalLength(),
precision = pathLength / pathNode.pathSegList.numberOfItems * .125,
best,
bestLength,
bestDistance = Infinity;
// linear scan for coarse approximation
for (var scan, scanLength = 0, scanDistance; scanLength <= pathLength; scanLength += precision) {
if ((scanDistance = distance2(scan = pathNode.getPointAtLength(scanLength))) < bestDistance) {
best = scan, bestLength = scanLength, bestDistance = scanDistance;
}
}
// binary search for precise estimate
precision *= .5;
while (precision > .5) {
var before,
after,
beforeLength,
afterLength,
beforeDistance,
afterDistance;
if ((beforeLength = bestLength - precision) >= 0 && (beforeDistance = distance2(before = pathNode.getPointAtLength(beforeLength))) < bestDistance) {
best = before, bestLength = beforeLength, bestDistance = beforeDistance;
} else if ((afterLength = bestLength + precision) <= pathLength && (afterDistance = distance2(after = pathNode.getPointAtLength(afterLength))) < bestDistance) {
best = after, bestLength = afterLength, bestDistance = afterDistance;
} else {
precision *= .5;
}
}
best = [best.x, best.y];
best.distance = Math.sqrt(bestDistance);
return best;
function distance2(p) {
var dx = p.x - point[0],
dy = p.y - point[1];
return dx * dx + dy * dy;
}
}
// K.dom[p] = function(w,p,v) { // for SVG unitless related CSS props
// w._el.style[p] = w._vS[p].value + (w._vE[p].value - w._vS[p].value) * v;
// };
/*
* Paths
*/
var spaces = "\x09\x0a\x0b\x0c\x0d\x20\xa0\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000\u2028\u2029";
var pathCommand = new RegExp("([a-z])[" + spaces + ",]*((-?\\d*\\.?\\d*(?:e[\\-+]?\\d+)?[" + spaces + "]*,?[" + spaces + "]*)+)", "ig");
var pathValues = new RegExp("(-?\\d*\\.?\\d*(?:e[\\-+]?\\d+)?)[" + spaces + "]*,?[" + spaces + "]*", "ig");
// Parses given path string into an array of arrays of path segments
function parsePathString(pathString) {
if (!pathString) {
return null;
}
if( pathString instanceof Array ) {
return pathString;
} else {
var paramCounts = {a: 7, c: 6, o: 2, h: 1, l: 2, m: 2, r: 4, q: 4, s: 4, t: 2, v: 1, u: 3, z: 0},
data = [];
String(pathString).replace(pathCommand, function(a, b, c) {
var params = [],
name = b.toLowerCase();
c.replace(pathValues, function (a, b) {
b && params.push(+b);
});
if (name == "m" && params.length > 2) {
data.push([b].concat(params.splice(0, 2)));
name = "l";
b = b == "m" ? "l" : "L";
}
if (name == "o" && params.length == 1) {
data.push([b, params[0]]);
}
if (name == "r") {
data.push([b].concat(params));
} else while (params.length >= paramCounts[name]) {
data.push([b].concat(params.splice(0, paramCounts[name])));
if (!paramCounts[name]) {
break;
}
}
});
return data;
}
};
// http://schepers.cc/getting-to-the-point
function catmullRom2bezier(crp, z) {
var d = [];
for (var i = 0, iLen = crp.length; iLen - 2 * !z > i; i += 2) {
var p = [
{x: +crp[i - 2], y: +crp[i - 1]},
{x: +crp[i], y: +crp[i + 1]},
{x: +crp[i + 2], y: +crp[i + 3]},
{x: +crp[i + 4], y: +crp[i + 5]}
];
if (z) {
if (!i) {
p[0] = {x: +crp[iLen - 2], y: +crp[iLen - 1]};
} else if (iLen - 4 == i) {
p[3] = {x: +crp[0], y: +crp[1]};
} else if (iLen - 2 == i) {
p[2] = {x: +crp[0], y: +crp[1]};
p[3] = {x: +crp[2], y: +crp[3]};
}
} else {
if (iLen - 4 == i) {
p[3] = p[2];
} else if (!i) {
p[0] = {x: +crp[i], y: +crp[i + 1]};
}
}
d.push(["C",
(-p[0].x + 6 * p[1].x + p[2].x) / 6,
(-p[0].y + 6 * p[1].y + p[2].y) / 6,
(p[1].x + 6 * p[2].x - p[3].x) / 6,
(p[1].y + 6*p[2].y - p[3].y) / 6,
p[2].x,
p[2].y
]);
}
return d;
};
function ellipsePath(x, y, rx, ry, a) {
if (a == null && ry == null) {
ry = rx;
}
x = +x;
y = +y;
rx = +rx;
ry = +ry;
if (a != null) {
var rad = Math.PI / 180,
x1 = x + rx * Math.cos(-ry * rad),
x2 = x + rx * Math.cos(-a * rad),
y1 = y + rx * Math.sin(-ry * rad),
y2 = y + rx * Math.sin(-a * rad),
res = [["M", x1, y1], ["A", rx, rx, 0, +(a - ry > 180), 0, x2, y2]];
} else {
res = [
["M", x, y],
["m", 0, -ry],
["a", rx, ry, 0, 1, 1, 0, 2 * ry],
["a", rx, ry, 0, 1, 1, 0, -2 * ry],
["z"]
];
}
return res;
};
function pathToAbsolute(pathArray) {
pathArray = parsePathString(pathArray);
if (!pathArray || !pathArray.length) {
return [["M", 0, 0]];
}
var res = [],
x = 0,
y = 0,
mx = 0,
my = 0,
start = 0,
pa0;
if (pathArray[0][0] == "M") {
x = +pathArray[0][1];
y = +pathArray[0][2];
mx = x;
my = y;
start++;
res[0] = ["M", x, y];
}
var crz = pathArray.length == 3 &&
pathArray[0][0] == "M" &&
pathArray[1][0].toUpperCase() == "R" &&
pathArray[2][0].toUpperCase() == "Z";
for (var r, pa, i = start, ii = pathArray.length; i < ii; i++) {
res.push(r = []);
pa = pathArray[i];
pa0 = pa[0];
if (pa0 != pa0.toUpperCase()) {
r[0] = pa0.toUpperCase();
switch (r[0]) {
case "A":
r[1] = pa[1];
r[2] = pa[2];
r[3] = pa[3];
r[4] = pa[4];
r[5] = pa[5];
r[6] = +pa[6] + x;
r[7] = +pa[7] + y;
break;
case "V":
r[1] = +pa[1] + y;
break;
case "H":
r[1] = +pa[1] + x;
break;
case "R":
var dots = [x, y].concat(pa.slice(1));
for (var j = 2, jj = dots.length; j < jj; j++) {
dots[j] = +dots[j] + x;
dots[++j] = +dots[j] + y;
}
res.pop();
res = res.concat(catmullRom2bezier(dots, crz));
break;
case "O":
res.pop();
dots = ellipsePath(x, y, pa[1], pa[2]);
dots.push(dots[0]);
res = res.concat(dots);
break;
case "U":
res.pop();
res = res.concat(ellipsePath(x, y, pa[1], pa[2], pa[3]));
r = ["U"].concat(res[res.length - 1].slice(-2));
break;
case "M":
mx = +pa[1] + x;
my = +pa[2] + y;
default:
for (j = 1, jj = pa.length; j < jj; j++) {
r[j] = +pa[j] + ((j % 2) ? x : y);
}
}
} else if (pa0 == "R") {
dots = [x, y].concat(pa.slice(1));
res.pop();
res = res.concat(catmullRom2bezier(dots, crz));
r = ["R"].concat(pa.slice(-2));
} else if (pa0 == "O") {
res.pop();
dots = ellipsePath(x, y, pa[1], pa[2]);
dots.push(dots[0]);
res = res.concat(dots);
} else if (pa0 == "U") {
res.pop();
res = res.concat(ellipsePath(x, y, pa[1], pa[2], pa[3]));
r = ["U"].concat(res[res.length - 1].slice(-2));
} else {
for (var k = 0, kk = pa.length; k < kk; k++) {
r[k] = pa[k];
}
}
pa0 = pa0.toUpperCase();
if (pa0 != "O") {
switch (r[0]) {
case "Z":
x = +mx;
y = +my;
break;
case "H":
x = r[1];
break;
case "V":
y = r[1];
break;
case "M":
mx = r[r.length - 2];
my = r[r.length - 1];
default:
x = r[r.length - 2];
y = r[r.length - 1];
}
}
}
return res;
};
function l2c(x1, y1, x2, y2) {
return [x1, y1, x2, y2, x2, y2];
};
function q2c(x1, y1, ax, ay, x2, y2) {
var _13 = 1 / 3,
_23 = 2 / 3;
return [
_13 * x1 + _23 * ax,
_13 * y1 + _23 * ay,
_13 * x2 + _23 * ax,
_13 * y2 + _23 * ay,
x2,
y2
];
};
function a2c(x1, y1, rx, ry, angle, large_arc_flag, sweep_flag, x2, y2, recursive) {
// for more information of where this math came from visit:
// http://www.w3.org/TR/SVG11/implnote.html#ArcImplementationNotes
var _120 = Math.PI * 120 / 180,
rad = Math.PI / 180 * (+angle || 0),
res = [],
xy,
rotate = function (x, y, rad) {
var X = x * Math.cos(rad) - y * Math.sin(rad),
Y = x * Math.sin(rad) + y * Math.cos(rad);
return {x: X, y: Y};
};
if (!recursive) {
xy = rotate(x1, y1, -rad);
x1 = xy.x;
y1 = xy.y;
xy = rotate(x2, y2, -rad);
x2 = xy.x;
y2 = xy.y;
var cos = Math.cos(Math.PI / 180 * angle),
sin = Math.sin(Math.PI / 180 * angle),
x = (x1 - x2) / 2,
y = (y1 - y2) / 2;
var h = (x * x) / (rx * rx) + (y * y) / (ry * ry);
if (h > 1) {
h = Math.sqrt(h);
rx = h * rx;
ry = h * ry;
}
var rx2 = rx * rx,
ry2 = ry * ry,
k = (large_arc_flag == sweep_flag ? -1 : 1) *
Math.sqrt(Math.abs((rx2 * ry2 - rx2 * y * y - ry2 * x * x) / (rx2 * y * y + ry2 * x * x))),
cx = k * rx * y / ry + (x1 + x2) / 2,
cy = k * -ry * x / rx + (y1 + y2) / 2,
f1 = Math.asin(((y1 - cy) / ry).toFixed(9)),
f2 = Math.asin(((y2 - cy) / ry).toFixed(9));
f1 = x1 < cx ? Math.PI - f1 : f1;
f2 = x2 < cx ? Math.PI - f2 : f2;
f1 < 0 && (f1 = Math.PI * 2 + f1);
f2 < 0 && (f2 = Math.PI * 2 + f2);
if (sweep_flag && f1 > f2) {
f1 = f1 - Math.PI * 2;
}
if (!sweep_flag && f2 > f1) {
f2 = f2 - Math.PI * 2;
}
} else {
f1 = recursive[0];
f2 = recursive[1];
cx = recursive[2];
cy = recursive[3];
}
var df = f2 - f1;
if (Math.abs(df) > _120) {
var f2old = f2,
x2old = x2,
y2old = y2;
f2 = f1 + _120 * (sweep_flag && f2 > f1 ? 1 : -1);
x2 = cx + rx * Math.cos(f2);
y2 = cy + ry * Math.sin(f2);
res = a2c(x2, y2, rx, ry, angle, 0, sweep_flag, x2old, y2old, [f2, f2old, cx, cy]);
}
df = f2 - f1;
var c1 = Math.cos(f1),
s1 = Math.sin(f1),
c2 = Math.cos(f2),
s2 = Math.sin(f2),
t = Math.tan(df / 4),
hx = 4 / 3 * rx * t,
hy = 4 / 3 * ry * t,
m1 = [x1, y1],
m2 = [x1 + hx * s1, y1 - hy * c1],
m3 = [x2 + hx * s2, y2 - hy * c2],
m4 = [x2, y2];
m2[0] = 2 * m1[0] - m2[0];
m2[1] = 2 * m1[1] - m2[1];
if (recursive) {
return [m2, m3, m4].concat(res);
} else {
res = [m2, m3, m4].concat(res).join().split(",");
var newres = [];
for (var i = 0, ii = res.length; i < ii; i++) {
newres[i] = i % 2 ? rotate(res[i - 1], res[i], rad).y : rotate(res[i], res[i + 1], rad).x;
}
return newres;
}
};
function clone(obj) {
var copy;
// Handle Array
if (obj instanceof Array) {
copy = [];
for (var i = 0, len = obj.length; i < len; i++) {
copy[i] = clone(obj[i]);
}
return copy;
}
// Handle Object
if (obj instanceof Object) {
copy = {};
for (var attr in obj) {
if (obj.hasOwnProperty(attr)) {
copy[attr] = clone(obj[attr]);
}
}
return copy;
}
return obj;
}
function path2curve(path, path2) {
var p = pathToAbsolute(path),
p2 = path2 && pathToAbsolute(path2),
attrs = {x: 0, y: 0, bx: 0, by: 0, X: 0, Y: 0, qx: null, qy: null},
attrs2 = {x: 0, y: 0, bx: 0, by: 0, X: 0, Y: 0, qx: null, qy: null},
processPath = function (path, d, pcom) {
var nx, ny;
if (!path) {
return ["C", d.x, d.y, d.x, d.y, d.x, d.y];
}
!(path[0] in {T: 1, Q: 1}) && (d.qx = d.qy = null);
switch (path[0]) {
case "M":
d.X = path[1];
d.Y = path[2];
break;
case "A":
path = ["C"].concat(a2c.apply(0, [d.x, d.y].concat(path.slice(1))));
break;
case "S":
if (pcom == "C" || pcom == "S") { // In "S" case we have to take into account, if the previous command is C/S.
nx = d.x * 2 - d.bx; // And reflect the previous
ny = d.y * 2 - d.by; // command's control point relative to the current point.
}
else { // or some else or nothing
nx = d.x;
ny = d.y;
}
path = ["C", nx, ny].concat(path.slice(1));
break;
case "T":
if (pcom == "Q" || pcom == "T") { // In "T" case we have to take into account, if the previous command is Q/T.
d.qx = d.x * 2 - d.qx; // And make a reflection similar
d.qy = d.y * 2 - d.qy; // to case "S".
}
else { // or something else or nothing
d.qx = d.x;
d.qy = d.y;
}
path = ["C"].concat(q2c(d.x, d.y, d.qx, d.qy, path[1], path[2]));
break;
case "Q":
d.qx = path[1];
d.qy = path[2];
path = ["C"].concat(q2c(d.x, d.y, path[1], path[2], path[3], path[4]));
break;
case "L":
path = ["C"].concat(l2c(d.x, d.y, path[1], path[2]));
break;
case "H":
path = ["C"].concat(l2c(d.x, d.y, path[1], d.y));
break;
case "V":
path = ["C"].concat(l2c(d.x, d.y, d.x, path[1]));
break;
case "Z":
path = ["C"].concat(l2c(d.x, d.y, d.X, d.Y));
break;
}
return path;
},
fixArc = function (pp, i) {
if (pp[i].length > 7) {
pp[i].shift();
var pi = pp[i];
while (pi.length) {
pcoms1[i] = "A"; // if created multiple C:s, their original seg is saved
p2 && (pcoms2[i] = "A"); // the same as above
pp.splice(i++, 0, ["C"].concat(pi.splice(0, 6)));
}
pp.splice(i, 1);
ii = Math.max(p.length, p2 && p2.length || 0);
}
},
fixM = function (path1, path2, a1, a2, i) {
if (path1 && path2 && path1[i][0] == "M" && path2[i][0] != "M") {
path2.splice(i, 0, ["M", a2.x, a2.y]);
a1.bx = 0;
a1.by = 0;
a1.x = path1[i][1];
a1.y = path1[i][2];
ii = Math.max(p.length, p2 && p2.length || 0);
}
},
pcoms1 = [], // path commands of original path p
pcoms2 = [], // path commands of original path p2
pfirst = "", // temporary holder for original path command
pcom = ""; // holder for previous path command of original path
for (var i = 0, ii = Math.max(p.length, p2 && p2.length || 0); i < ii; i++) {
p[i] && (pfirst = p[i][0]); // save current path command
if (pfirst != "C") { // C is not saved yet, because it may be result of conversion
pcoms1[i] = pfirst; // Save current path command
i && ( pcom = pcoms1[i - 1]); // Get previous path command pcom
}
p[i] = processPath(p[i], attrs, pcom); // Previous path command is inputted to processPath
if (pcoms1[i] != "A" && pfirst == "C") pcoms1[i] = "C"; // A is the only command
// which may produce multiple C:s
// so we have to make sure that C is also C in original path
fixArc(p, i); // fixArc adds also the right amount of A:s to pcoms1
if (p2) { // the same procedures is done to p2
p2[i] && (pfirst = p2[i][0]);
if (pfirst != "C") {
pcoms2[i] = pfirst;
i && (pcom = pcoms2[i - 1]);
}
p2[i] = processPath(p2[i], attrs2, pcom);
if (pcoms2[i] != "A" && pfirst == "C") {
pcoms2[i] = "C";
}
fixArc(p2, i);
}
fixM(p, p2, attrs, attrs2, i);
fixM(p2, p, attrs2, attrs, i);
var seg = p[i],
seg2 = p2 && p2[i],
seglen = seg.length,
seg2len = p2 && seg2.length;
attrs.x = seg[seglen - 2];
attrs.y = seg[seglen - 1];
attrs.bx = parseFloat(seg[seglen - 4]) || attrs.x;
attrs.by = parseFloat(seg[seglen - 3]) || attrs.y;
attrs2.bx = p2 && (parseFloat(seg2[seg2len - 4]) || attrs2.x);
attrs2.by = p2 && (parseFloat(seg2[seg2len - 3]) || attrs2.y);
attrs2.x = p2 && seg2[seg2len - 2];
attrs2.y = p2 && seg2[seg2len - 1];
}
return p2 ? [p, p2] : p;
};
function box(x, y, width, height) {
if (x == null) {
x = y = width = height = 0;
}
if (y == null) {
y = x.y;
width = x.width;
height = x.height;
x = x.x;
}
return {
x: x,
y: y,
w: width,
h: height,
cx: x + width / 2,
cy: y + height / 2
};
};
// Returns bounding box of cubic bezier curve.
// Source: http://blog.hackers-cafe.net/2009/06/how-to-calculate-bezier-curves-bounding.html
// Original version: NISHIO Hirokazu
// Modifications: https://github.com/timo22345
function curveDim(x0, y0, x1, y1, x2, y2, x3, y3) {
var tvalues = [],
bounds = [[], []],
a, b, c, t, t1, t2, b2ac, sqrtb2ac;
for (var i = 0; i < 2; ++i) {
if (i == 0) {
b = 6 * x0 - 12 * x1 + 6 * x2;
a = -3 * x0 + 9 * x1 - 9 * x2 + 3 * x3;
c = 3 * x1 - 3 * x0;
} else {
b = 6 * y0 - 12 * y1 + 6 * y2;
a = -3 * y0 + 9 * y1 - 9 * y2 + 3 * y3;
c = 3 * y1 - 3 * y0;
}
if (Math.abs(a) < 1e-12) {
if (Math.abs(b) < 1e-12) {
continue;
}
t = -c / b;
if (0 < t && t < 1) {
tvalues.push(t);
}
continue;
}
b2ac = b * b - 4 * c * a;
sqrtb2ac = Math.sqrt(b2ac);
if (b2ac < 0) {
continue;
}
t1 = (-b + sqrtb2ac) / (2 * a);
if (0 < t1 && t1 < 1) {
tvalues.push(t1);
}
t2 = (-b - sqrtb2ac) / (2 * a);
if (0 < t2 && t2 < 1) {
tvalues.push(t2);
}
}
var j = tvalues.length,
jlen = j,
mt;
while (j--) {
t = tvalues[j];
mt = 1 - t;
bounds[0][j] = (mt * mt * mt * x0) + (3 * mt * mt * t * x1) + (3 * mt * t * t * x2) + (t * t * t * x3);
bounds[1][j] = (mt * mt * mt * y0) + (3 * mt * mt * t * y1) + (3 * mt * t * t * y2) + (t * t * t * y3);
}
bounds[0][jlen] = x0;
bounds[1][jlen] = y0;
bounds[0][jlen + 1] = x3;
bounds[1][jlen + 1] = y3;
bounds[0].length = bounds[1].length = jlen + 2;
return {
min: {x: Math.min.apply(0, bounds[0]), y: Math.min.apply(0, bounds[1])},
max: {x: Math.max.apply(0, bounds[0]), y: Math.max.apply(0, bounds[1])}
};
};
function curvePathBBox(path) {
var x = 0,
y = 0,
X = [],
Y = [],
p;
for (var i = 0, ii = path.length; i < ii; i++) {
p = path[i];
if (p[0] == "M") {
x = p[1];
y = p[2];
X.push(x);
Y.push(y);
} else {
var dim = curveDim(x, y, p[1], p[2], p[3], p[4], p[5], p[6]);
X = X.concat(dim.min.x, dim.max.x);
Y = Y.concat(dim.min.y, dim.max.y);
x = p[5];
y = p[6];
}
}
var xmin = Math.min.apply(0, X),
ymin = Math.min.apply(0, Y),
xmax = Math.max.apply(0, X),
ymax = Math.max.apply(0, Y),
bb = box(xmin, ymin, xmax - xmin, ymax - ymin);
return bb;
};
S.path2string = function(path) {
return path.join(',').replace(p2s, "$1");
};
return S;
}));