libs/matrix/utils.js
"use strict";
var Matrix = require(__dirname + '/matrix'),
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",
Str = String,
has = "hasOwnProperty";
module.exports = {
clone : function(obj) {
if (typeof obj == "function" || Object(obj) !== obj) {
return obj;
}
var res = new obj.constructor;
for (var key in obj) if (obj[has](key)) {
res[key] = this.clone(obj[key]);
}
return res;
},
is : function(o, type) {
type = Str.prototype.toLowerCase.call(type);
if (type == "finite") {
return isFinite(o);
}
if (type == "array" &&
(o instanceof Array || Array.isArray && Array.isArray(o))) {
return true;
}
return (type == "null" && o === null) ||
(type == typeof o && o !== null) ||
(type == "object" && o === Object(o)) ||
objectToString.call(o).slice(8, -1).toLowerCase() == type;
},
parseTransformString : function(TString){
if (!TString) {
return null;
}
var paramCounts = {r: 3, s: 4, t: 2, m: 6},
data = [];
if (this.is(TString, "array") && this.is(TString[0], "array")) { // rough assumption
data = this.clone(TString);
}
if (!data.length) {
Str(TString).replace(tCommand, function (a, b, c) {
var params = [],
name = b.toLowerCase();
c.replace(pathValues, function (a, b) {
b && params.push(+b);
});
data.push([b].concat(params));
});
}
return data;
},
rgTransform : new RegExp("^[a-z][" + spaces + "]*-?\\.?\\d"),
transform2matrix : function(tstr, bbox){
var tdata = this.parseTransformString(tstr),
m = new Matrix;
if (tdata) {
for (var i = 0, ii = tdata.length; i < ii; i++) {
var t = tdata[i],
tlen = t.length,
command = Str(t[0]).toLowerCase(),
absolute = t[0] != command,
inver = absolute ? m.invert() : 0,
x1,
y1,
x2,
y2,
bb;
if (command == "t" && tlen == 2){
m.translate(t[1], 0);
} else if (command == "t" && tlen == 3) {
if (absolute) {
x1 = inver.x(0, 0);
y1 = inver.y(0, 0);
x2 = inver.x(t[1], t[2]);
y2 = inver.y(t[1], t[2]);
m.translate(x2 - x1, y2 - y1);
} else {
m.translate(t[1], t[2]);
}
} else if (command == "r") {
if (tlen == 2) {
bb = bb || bbox;
m.rotate(t[1], bb.x + bb.width / 2, bb.y + bb.height / 2);
} else if (tlen == 4) {
if (absolute) {
x2 = inver.x(t[2], t[3]);
y2 = inver.y(t[2], t[3]);
m.rotate(t[1], x2, y2);
} else {
m.rotate(t[1], t[2], t[3]);
}
}
} else if (command == "s") {
if (tlen == 2 || tlen == 3) {
bb = bb || bbox;
m.scale(t[1], t[tlen - 1], bb.x + bb.width / 2, bb.y + bb.height / 2);
} else if (tlen == 4) {
if (absolute) {
x2 = inver.x(t[2], t[3]);
y2 = inver.y(t[2], t[3]);
m.scale(t[1], t[1], x2, y2);
} else {
m.scale(t[1], t[1], t[2], t[3]);
}
} else if (tlen == 5) {
if (absolute) {
x2 = inver.x(t[3], t[4]);
y2 = inver.y(t[3], t[4]);
m.scale(t[1], t[2], x2, y2);
} else {
m.scale(t[1], t[2], t[3], t[4]);
}
}
} else if (command == "m" && tlen == 7) {
m.add(t[1], t[2], t[3], t[4], t[5], t[6]);
}
}
}
return m;
},
rectPath : function(x, y, w, h, r) {
if (r) {
return [
["M", x + r, y],
["l", w - r * 2, 0],
["a", r, r, 0, 0, 1, r, r],
["l", 0, h - r * 2],
["a", r, r, 0, 0, 1, -r, r],
["l", r * 2 - w, 0],
["a", r, r, 0, 0, 1, -r, -r],
["l", 0, r * 2 - h],
["a", r, r, 0, 0, 1, r, -r],
["z"]
];
}
var res = [["M", x, y], ["l", w, 0], ["l", 0, h], ["l", -w, 0], ["z"]];
//res.toString = toString;
return res;
},
bbox : function(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,
width: width,
w: width,
height: height,
h: height,
x2: x + width,
y2: y + height,
cx: x + width / 2,
cy: y + height / 2,
r1: Math.min(width, height) / 2,
r2: Math.max(width, height) / 2,
r0: Math.sqrt(width * width + height * height) / 2,
path: this.rectPath(x, y, width, height),
vb: [x, y, width, height].join(" ")
};
}
};