104 lines
3.6 KiB
JavaScript
104 lines
3.6 KiB
JavaScript
import { isAroundZero } from './helper.js';
|
|
var mathSin = Math.sin;
|
|
var mathCos = Math.cos;
|
|
var PI = Math.PI;
|
|
var PI2 = Math.PI * 2;
|
|
var degree = 180 / PI;
|
|
var SVGPathRebuilder = (function () {
|
|
function SVGPathRebuilder() {
|
|
}
|
|
SVGPathRebuilder.prototype.reset = function (precision) {
|
|
this._start = true;
|
|
this._d = [];
|
|
this._str = '';
|
|
this._p = Math.pow(10, precision || 4);
|
|
};
|
|
SVGPathRebuilder.prototype.moveTo = function (x, y) {
|
|
this._add('M', x, y);
|
|
};
|
|
SVGPathRebuilder.prototype.lineTo = function (x, y) {
|
|
this._add('L', x, y);
|
|
};
|
|
SVGPathRebuilder.prototype.bezierCurveTo = function (x, y, x2, y2, x3, y3) {
|
|
this._add('C', x, y, x2, y2, x3, y3);
|
|
};
|
|
SVGPathRebuilder.prototype.quadraticCurveTo = function (x, y, x2, y2) {
|
|
this._add('Q', x, y, x2, y2);
|
|
};
|
|
SVGPathRebuilder.prototype.arc = function (cx, cy, r, startAngle, endAngle, anticlockwise) {
|
|
this.ellipse(cx, cy, r, r, 0, startAngle, endAngle, anticlockwise);
|
|
};
|
|
SVGPathRebuilder.prototype.ellipse = function (cx, cy, rx, ry, psi, startAngle, endAngle, anticlockwise) {
|
|
var dTheta = endAngle - startAngle;
|
|
var clockwise = !anticlockwise;
|
|
var dThetaPositive = Math.abs(dTheta);
|
|
var isCircle = isAroundZero(dThetaPositive - PI2)
|
|
|| (clockwise ? dTheta >= PI2 : -dTheta >= PI2);
|
|
var unifiedTheta = dTheta > 0 ? dTheta % PI2 : (dTheta % PI2 + PI2);
|
|
var large = false;
|
|
if (isCircle) {
|
|
large = true;
|
|
}
|
|
else if (isAroundZero(dThetaPositive)) {
|
|
large = false;
|
|
}
|
|
else {
|
|
large = (unifiedTheta >= PI) === !!clockwise;
|
|
}
|
|
var x0 = cx + rx * mathCos(startAngle);
|
|
var y0 = cy + ry * mathSin(startAngle);
|
|
if (this._start) {
|
|
this._add('M', x0, y0);
|
|
}
|
|
var xRot = Math.round(psi * degree);
|
|
if (isCircle) {
|
|
var p = 1 / this._p;
|
|
var dTheta_1 = (clockwise ? 1 : -1) * (PI2 - p);
|
|
this._add('A', rx, ry, xRot, 1, +clockwise, cx + rx * mathCos(startAngle + dTheta_1), cy + ry * mathSin(startAngle + dTheta_1));
|
|
if (p > 1e-2) {
|
|
this._add('A', rx, ry, xRot, 0, +clockwise, x0, y0);
|
|
}
|
|
}
|
|
else {
|
|
var x = cx + rx * mathCos(endAngle);
|
|
var y = cy + ry * mathSin(endAngle);
|
|
this._add('A', rx, ry, xRot, +large, +clockwise, x, y);
|
|
}
|
|
};
|
|
SVGPathRebuilder.prototype.rect = function (x, y, w, h) {
|
|
this._add('M', x, y);
|
|
this._add('l', w, 0);
|
|
this._add('l', 0, h);
|
|
this._add('l', -w, 0);
|
|
this._add('Z');
|
|
};
|
|
SVGPathRebuilder.prototype.closePath = function () {
|
|
if (this._d.length > 0) {
|
|
this._add('Z');
|
|
}
|
|
};
|
|
SVGPathRebuilder.prototype._add = function (cmd, a, b, c, d, e, f, g, h) {
|
|
var vals = [];
|
|
var p = this._p;
|
|
for (var i = 1; i < arguments.length; i++) {
|
|
var val = arguments[i];
|
|
if (isNaN(val)) {
|
|
this._invalid = true;
|
|
return;
|
|
}
|
|
vals.push(Math.round(val * p) / p);
|
|
}
|
|
this._d.push(cmd + vals.join(' '));
|
|
this._start = cmd === 'Z';
|
|
};
|
|
SVGPathRebuilder.prototype.generateStr = function () {
|
|
this._str = this._invalid ? '' : this._d.join('');
|
|
this._d = [];
|
|
};
|
|
SVGPathRebuilder.prototype.getStr = function () {
|
|
return this._str;
|
|
};
|
|
return SVGPathRebuilder;
|
|
}());
|
|
export default SVGPathRebuilder;
|