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utils.js
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utils.js
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// Copyright (c) 2014, 2015 Adobe Systems Incorporated. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/*jslint vars: true, plusplus: true, devel: true, nomen: true, indent: 4, bitwise: true */
/*global define: true, require: true, module: true */
/* Help write the SVG */
(function () {
"use strict";
var Buffer = require('buffer').Buffer,
guidID = 1,
svgWriterIDs = require("./svgWriterIDs.js");
function Utils() {
var self = this;
self.px = function (ctx, length) {
if (typeof length === "number")
return length;
// Consider adding string conversion when needed.
if (typeof length !== "object" || !length.units)
return 0;
switch (length.units) {
case "pointsUnit":
return self.round1k(length.value * ctx.pxToInchRatio / 72);
case "millimetersUnit":
return self.round1k(length.value * ctx.pxToInchRatio / 25.4);
case "rulerCm":
return self.round1k(length.value * ctx.pxToInchRatio / 2.54);
case "rulerInches":
return self.round1k(length.value * ctx.pxToInchRatio);
case "rulerPicas":
return self.round1k(length.value * ctx.pxToInchRatio / 6);
}
return 0;
};
self.round2 = function (x) {
return +(+x).toFixed(2);
};
self.round1k = function (x) {
return +(+x).toFixed(3);
};
self.round10k = function (x) {
return +(+x).toFixed(4);
};
self.roundUp = function (x) {
return Math.ceil(x);
};
self.roundDown = function (x) {
return Math.round(x);
};
self.unionRect = function (rect1, rect2, expand) {
if (!rect2) {
return;
}
if (!isFinite(rect1.left) || (rect2.left - expand) < rect1.left) {
rect1.left = (rect2.left - expand);
}
if (!isFinite(rect1.right) || (rect2.right + expand) > rect1.right) {
rect1.right = rect2.right + expand;
}
if (!isFinite(rect1.top) || (rect2.top - expand) < rect1.top) {
rect1.top = rect2.top - expand;
}
if (!isFinite(rect1.bottom) || (rect2.bottom + expand) > rect1.bottom) {
rect1.bottom = rect2.bottom + expand;
}
};
/** jQuery-style extend
* https://github.com/jquery/jquery/blob/master/src/core.js
*/
var class2type = {
"[object Boolean]": "boolean",
"[object Number]": "number",
"[object String]": "string",
"[object Function]": "function",
"[object Array]": "array",
"[object Date]": "date",
"[object RegExp]": "regexp",
"[object Object]": "object"
},
jQueryLike = {
isFunction: function (obj) {
return jQueryLike.type(obj) === "function";
},
isArray: Array.isArray,
type: function (obj) {
return obj == null ? String(obj) : class2type[String(obj)] || "object";
},
isPlainObject: function (obj) {
if (!obj || jQueryLike.type(obj) !== "object" || obj.nodeType) {
return false;
}
try {
if (obj.constructor && !obj.hasOwnProperty("constructor") && !obj.constructor.prototype.hasOwnProperty("isPrototypeOf")) {
return false;
}
} catch (e) {
return false;
}
var key;
for (key in obj) {}
return key === undefined || obj.hasOwnProperty(key);
}
};
self.extend = function (deep, target, source) {
var options, name, src, copy, copyIsArray, clone, target = arguments[0] || {},
i = 1,
length = arguments.length,
deep = false,
toString = Object.prototype.toString,
hasOwn = Object.prototype.hasOwnProperty,
push = Array.prototype.push,
slice = Array.prototype.slice,
trim = String.prototype.trim,
indexOf = Array.prototype.indexOf;
if (typeof target === "boolean") {
deep = target;
target = arguments[1] || {};
i = 2;
}
if (typeof target !== "object" && !jQueryLike.isFunction(target)) {
target = {};
}
for (i; i < length; i++) {
if ((options = arguments[i]) != null) {
for (name in options) {
src = target[name];
copy = options[name];
if (target === copy) {
continue;
}
if (deep && copy && (jQueryLike.isPlainObject(copy) || (copyIsArray = jQueryLike.isArray(copy)))) {
if (copyIsArray) {
copyIsArray = false;
clone = src && jQueryLike.isArray(src) ? src : [];
} else {
clone = src && jQueryLike.isPlainObject(src) ? src : {};
}
target[name] = self.extend(deep, clone, copy);
} else if (copy !== undefined) {
target[name] = copy;
}
}
}
}
return target;
};
self.toBase64 = function (string) {
var buf = new Buffer(string);
return buf.toString("base64");
};
function intersect(x1, y1, x2, y2, x3, y3, x4, y4) {
var nx = (x1 * y2 - y1 * x2) * (x3 - x4) - (x1 - x2) * (x3 * y4 - y3 * x4),
ny = (x1 * y2 - y1 * x2) * (y3 - y4) - (y1 - y2) * (x3 * y4 - y3 * x4),
denominator = (x1 - x2) * (y3 - y4) - (y1 - y2) * (x3 - x4);
if (!denominator) {
return;
}
var px = nx / denominator,
py = ny / denominator;
return {x: px, y: py};
}
function calc_bisect_perp(x1, y1, x2, y2) {
var dx = x2 - x1,
dy = y2 - y1;
if (dy == 0) {
return [x1 + dx / 2, 0, x1 + dx / 2, 1];
} else if (dx == 0) {
return [0, y1 + dy / 2, 1, y1 + dy / 2];
} else {
var m, b, x3, y3;
m = -dx / dy;
x3 = x1 + dx / 2;
y3 = y1 + dy / 2;
b = y3 - m * x3;
return [0, b, 1, m + b];
}
}
function len(x1, y1, x2, y2) {
return Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));
}
function angle(x1, y1, x2, y2) {
if (x1 == x2) {
if (y2 < y1) {
return 270;
} else {
return 90;
}
} else if (y1 == y2) {
if (x2 < x1) {
return 180;
} else {
return 0;
}
} else {
var angle = Math.atan2(y2 - y1, x2 - x1) * 180 / Math.PI;
if (angle < 0) {
angle += 360;
}
return angle;
}
}
function arc3(x1, y1, x2, y2, x3, y3) {
var out = {};
if (x1 == x2 && y1 == y2 || x3 == x2 && y3 == y2) {
out.path = "L" + [x3, y3];
return out;
}
if (x1 == x3 && y1 == y3) {
r = len(x1, y1, x2, y2) / 2;
out.path = "A" + [r, r, 0, 0, 0, x2, y2] + "A" + [r, r, 0, 0, 0, x1, y1];
return out;
}
var bp1 = calc_bisect_perp(x1, y1, x2, y2),
bp2 = calc_bisect_perp(x2, y2, x3, y3),
inter = intersect(bp1[0], bp1[1], bp1[2], bp1[3], bp2[0], bp2[1], bp2[2], bp2[3]),
ang_start = inter && angle(inter.x, inter.y, x1, y1),
ang_int = inter && angle(inter.x, inter.y, x2, y2),
ang_end = inter && angle(inter.x, inter.y, x3, y3),
angl = ang_end - ang_start;
if (ang_int < ang_start) {
if (ang_start < ang_end) {
angl -= 360;
} else if (ang_int < ang_end) {
angl += 360;
}
} else {
if (ang_end < ang_start) {
angl += 360;
} else if (ang_end < ang_int) {
angl -= 360;
}
}
if (inter) {
var r = len(x1, y1, inter.x, inter.y);
out.cx = inter.x;
out.cy = inter.y;
out.a1 = ang_start;
out.a2 = ang_end;
out.r = r;
out.a = angl;
out.f1 = +(Math.abs(angl) > 180);
out.f2 = +(angl > 0);
out.path = "A" + [safeRound(r), safeRound(r), 0, out.f1, out.f2, x3, y3];
} else {
out.path = "L" + [x3, y3];
}
return out;
}
function safeRound(n) {
var match = (+n).toFixed(10).match(safeRound.rg);
return match ? +match[0] : n;
}
safeRound.rg = /^\d*\.[^0]*(?=0|$)/;
function findDotAtBezierSegment(p1x, p1y, c1x, c1y, c2x, c2y, p2x, p2y, t) {
var t1 = 1 - t,
pow = Math.pow;
return {
x: pow(t1, 3) * p1x + pow(t1, 2) * 3 * t * c1x + t1 * 3 * t * t * c2x + pow(t, 3) * p2x,
y: pow(t1, 3) * p1y + pow(t1, 2) * 3 * t * c1y + t1 * 3 * t * t * c2y + pow(t, 3) * p2y
};
}
function asArc(p1x, p1y, c1x, c1y, c2x, c2y, p2x, p2y) {
var m = findDotAtBezierSegment(p1x, p1y, c1x, c1y, c2x, c2y, p2x, p2y, .5),
arc = arc3(p1x, p1y, m.x, m.y, p2x, p2y);
for (var i = 1; i < 10; i++) {
if (i != 5) {
var dot = findDotAtBezierSegment(p1x, p1y, c1x, c1y, c2x, c2y, p2x, p2y, i / 10);
if (Math.abs(len(arc.cx, arc.cy, dot.x, dot.y) - arc.r) > .5) {
return null;
}
}
}
return arc;
}
self.precision = function (arg) {
return isFinite(arg) ? arg : 3;
}
self.pointsToString = function (points, precision) {
var precision = self.precision(precision);
return points.map(function (item) {
return item.x.toFixed(precision) + " " + item.y.toFixed(precision);
}).join();
};
self.optimisePath = function (path, precision) {
return path;
var precision = self.precision(precision);
function isSmall(num) {
return Math.abs(num.toFixed(precision)) <= sigma;
}
function goodEnough(num) {
return Math.abs(num.toFixed(precision - 1)) <= gamma;
}
function c2l(seg) {
if (seg.cmd == "C") {
if (seg.command == "C" && isSmall(seg.rest[0] - seg.x) && isSmall(seg.rest[1] - seg.y) && isSmall(seg.rest[2] - seg.rest[4]) && isSmall(seg.rest[3] - seg.rest[5])) {
seg.command = seg.cmd = "L";
seg.rest = [seg.rest[4], seg.rest[5]];
}
if (seg.command == "c" && seg.rest[0] == 0 && seg.rest[1] == 0 && isSmall(seg.rest[2] - seg.rest[4]) && isSmall(seg.rest[3] - seg.rest[5])) {
seg.command = "l";
seg.cmd = "L";
seg.rest = [seg.rest[4], seg.rest[5]];
}
}
}
function l2h(seg) {
if (seg.command == "L" && isSmall(+seg.rest[1] - seg.y)) {
seg.command = seg.cmd = "H";
seg.rest.pop();
}
if (seg.command == "l" && isSmall(+seg.rest[1])) {
seg.command = "h";
seg.cmd = "H";
seg.rest.pop();
}
}
function l2v(seg) {
if (seg.command == "L" && isSmall(+seg.rest[0] - seg.x)) {
seg.command = seg.cmd = "V";
seg.rest.shift();
}
if (seg.command == "l" && isSmall(+seg.rest[0])) {
seg.command = "v";
seg.cmd = "V";
seg.rest.shift();
}
}
function c2a(segp, seg) {
if (seg.cmd == "C") {
var rest = seg.rest,
x = seg.x,
y = seg.y,
X = seg.type == "abs" ? rest[4] : rest[4] + x,
Y = seg.type == "abs" ? rest[5] : rest[5] + y,
arc = seg.type == "abs" ? asArc(x, y, rest[0], rest[1], rest[2], rest[3], X, Y) : asArc(x, y, rest[0] + x, rest[1] + y, rest[2] + x, rest[3] + y, X, Y);
// This number 1e5 should be dependant on the dimensions
if (arc && arc.r && arc.r < 1e5) {
if (segp.r && Math.abs(segp.r - arc.r) < .5 && Math.abs(segp.cx - arc.cx) < .5 && Math.abs(segp.cy - arc.cy) < .5) {
segp.command = "A";
segp.a += arc.a;
if (Math.abs(segp.a) >= 360) {
segp.rest[5] = segp.cx * 2 - segp.x;
segp.rest[6] = segp.cy * 2 - segp.y;
seg.command = seg.cmd = "A";
seg.rest = [segp.r, segp.r, 0, 0, arc.f2, X, Y];
return;
}
// Need to calculate it again for better precision
arc = arc3(segp.x, segp.y, seg.x, seg.y, X, Y);
segp.a = arc.a;
segp.rest[0] = arc.r;
segp.rest[1] = arc.r;
segp.rest[3] = +(Math.abs(arc.a) > 180);
segp.rest[4] = +(arc.a > 0);
segp.rest[5] = X;
segp.rest[6] = Y;
return "unite";
}
seg.command = seg.cmd = "A";
seg.rest = [safeRound(arc.r), safeRound(arc.r), 0, arc.f1, arc.f2, rest[4], rest[5]];
seg.r = arc.r;
seg.cx = arc.cx;
seg.cy = arc.cy;
seg.a = arc.a;
}
}
}
function c2s(segp, seg) {
if (segp && seg.cmd == "C" && (segp.cmd == "C" || segp.cmd == "S")) {
var prevAnchor = {
x: segp.rest[segp.rest.length - 4] + (segp.type == "rel" ? segp.x : 0),
y: segp.rest[segp.rest.length - 3] + (segp.type == "rel" ? segp.y : 0)
},
anchor = {
x: 2 * seg.x - prevAnchor.x,
y: 2 * seg.y - prevAnchor.y
};
if (goodEnough(seg.rest[0] - anchor.x) && goodEnough(seg.rest[1] - anchor.y)) {
seg.rest.splice(0, 2);
seg.cmd = "S";
seg.command = seg.command == "C" ? "S" : "s";
}
}
}
function h2hv2v(segp, seg) {
var pcmd = segp && segp.cmd.toLowerCase();
if (segp && pcmd == seg.cmd.toLowerCase() && (pcmd == "h" || pcmd == "v")) {
if (seg.type == "rel") {
segp.rest[0] += seg.rest[0];
} else if (segp.type == "rel") {
segp.rest[0] += seg.rest[0] - (pcmd == "h" ? seg.x : seg.y);
} else {
segp.rest[0] = seg.rest[0];
}
return "unite";
}
}
var res = "",
args = {
abs: "",
rel: ""
},
type,
sigma = Math.pow(10, -precision),
gamma = Math.pow(10, 1 - precision),
x = 0,
y = 0,
mx,
my,
num,
prev,
nextAnchor,
segs = [];
path.replace(/([a-df-z])\s*([^a-df-z]+)?/ig, function (all, command, rest) {
if (rest) {
rest = rest.split(/(?:\s*,\s*|(?=-)|\s+\b)/).map(function (x) { return +x; });
type = command.toLowerCase() == command ? "rel" : "abs";
if (command.toUpperCase() == "M") {
mx = rest[0];
my = rest[1];
}
segs.push({
command: command,
cmd: command.toUpperCase(),
rest: rest,
type: type,
x: x,
y: y
});
switch (command.toUpperCase()) {
case "M":
case "C":
case "Q":
case "T":
case "S":
case "A":
case "L":
x = (x * type == "rel") + rest[rest.length - 2];
y = (y * type == "rel") + rest[rest.length - 1];
break;
case "H":
x = (x * type == "rel") + rest[0];
break;
case "V":
y = (y * type == "rel") + rest[0];
break;
}
} else {
segs.push({
command: command,
cmd: command.toUpperCase()
});
x = mx;
y = my;
}
});
for (var i = 0; i < segs.length; i++) {
// Special case for "C" instead of "L"
c2l(segs[i]);
// Special case if "L" instead of "H"
l2h(segs[i]);
// Special case if "L" instead of "V"
l2v(segs[i]);
// Special case if "C" instead of "A"
if (c2a(segs[i - 1], segs[i]) == "unite") {
segs.splice(i, 1);
i--;
}
// Special case if "C" instead of "S"
c2s(segs[i - 1], segs[i], goodEnough);
// Special case if "C" instead of "A"
if (h2hv2v(segs[i - 1], segs[i]) == "unite") {
segs.splice(i, 1);
i--;
}
}
for (i = 0; i < segs.length; i++) {
var command = segs[i].command,
rest = segs[i].rest,
type = segs[i].type,
x = segs[i].x,
y = segs[i].y,
mul = type == "abs" ? -1 : 1;
args.abs = args.rel = "";
if (rest) {
for (var j = 0, jj = rest.length; j < jj; j++) if (isFinite(rest[j])) {
num = +rest[j].toFixed(precision);
if (Math.abs(num - ~~num) < sigma) {
num = ~~num;
}
args[type] += num < 0 || !j ? num : "," + num;
switch (command.toUpperCase()) {
case "M":
case "L":
case "C":
case "S":
case "Q":
case "T":
case "H":
num += (j % 2 ? y : x) * mul;
break;
case "V":
num += y * mul;
break;
case "A":
if (j == 5) {
num += x * mul;
}
if (j == 6) {
num += y * mul;
}
break;
}
num = +num.toFixed(precision);
args[type == "abs" ? "rel" : "abs"] += num < 0 || !j ? num : "," + num;
}
if (args.abs.length <= args.rel.length) {
command = command.toUpperCase();
} else {
command = command.toLowerCase();
}
if (prev != command && (prev != "M" || command != "L")) {
res += command;
} else {
res += +rest[0].toFixed(precision) < 0 ? "" : ",";
}
prev = command;
if (args.abs.length <= args.rel.length) {
res += args.abs;
} else {
res += args.rel;
}
} else {
res += "Z";
prev = "Z";
}
}
return res;
};
self.safeRound = safeRound;
}
module.exports = new Utils();
}());