1 |
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2 | (function (global, factory) {
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3 | typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
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4 | typeof define === 'function' && define.amd ? define(['exports'], factory) :
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5 | (factory((global.d3 = global.d3 || {})));
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6 | }(this, function (exports) { 'use strict';
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7 |
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8 | var pi = Math.PI;
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9 | var tau = 2 * pi;
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10 | var epsilon = 1e-6;
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11 | var tauEpsilon = tau - epsilon;
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12 | function Path() {
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13 | this._x0 = this._y0 =
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14 | this._x1 = this._y1 = null;
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15 | this._ = [];
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16 | }
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17 |
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18 | function path() {
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19 | return new Path;
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20 | }
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21 |
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22 | Path.prototype = path.prototype = {
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23 | constructor: Path,
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24 | moveTo: function(x, y) {
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25 | this._.push("M", this._x0 = this._x1 = +x, ",", this._y0 = this._y1 = +y);
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26 | },
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27 | closePath: function() {
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28 | if (this._x1 !== null) {
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29 | this._x1 = this._x0, this._y1 = this._y0;
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30 | this._.push("Z");
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31 | }
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32 | },
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33 | lineTo: function(x, y) {
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34 | this._.push("L", this._x1 = +x, ",", this._y1 = +y);
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35 | },
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36 | quadraticCurveTo: function(x1, y1, x, y) {
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37 | this._.push("Q", +x1, ",", +y1, ",", this._x1 = +x, ",", this._y1 = +y);
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38 | },
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39 | bezierCurveTo: function(x1, y1, x2, y2, x, y) {
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40 | this._.push("C", +x1, ",", +y1, ",", +x2, ",", +y2, ",", this._x1 = +x, ",", this._y1 = +y);
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41 | },
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42 | arcTo: function(x1, y1, x2, y2, r) {
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43 | x1 = +x1, y1 = +y1, x2 = +x2, y2 = +y2, r = +r;
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44 | var x0 = this._x1,
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45 | y0 = this._y1,
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46 | x21 = x2 - x1,
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47 | y21 = y2 - y1,
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48 | x01 = x0 - x1,
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49 | y01 = y0 - y1,
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50 | l01_2 = x01 * x01 + y01 * y01;
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51 |
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52 |
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53 | if (r < 0) throw new Error("negative radius: " + r);
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54 |
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55 |
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56 | if (this._x1 === null) {
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57 | this._.push(
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58 | "M", this._x1 = x1, ",", this._y1 = y1
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59 | );
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60 | }
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61 |
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62 |
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63 | else if (!(l01_2 > epsilon));
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64 |
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65 |
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66 |
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67 |
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68 | else if (!(Math.abs(y01 * x21 - y21 * x01) > epsilon) || !r) {
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69 | this._.push(
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70 | "L", this._x1 = x1, ",", this._y1 = y1
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71 | );
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72 | }
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73 |
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74 |
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75 | else {
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76 | var x20 = x2 - x0,
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77 | y20 = y2 - y0,
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78 | l21_2 = x21 * x21 + y21 * y21,
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79 | l20_2 = x20 * x20 + y20 * y20,
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80 | l21 = Math.sqrt(l21_2),
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81 | l01 = Math.sqrt(l01_2),
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82 | l = r * Math.tan((pi - Math.acos((l21_2 + l01_2 - l20_2) / (2 * l21 * l01))) / 2),
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83 | t01 = l / l01,
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84 | t21 = l / l21;
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85 |
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86 |
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87 | if (Math.abs(t01 - 1) > epsilon) {
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88 | this._.push(
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89 | "L", x1 + t01 * x01, ",", y1 + t01 * y01
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90 | );
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91 | }
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92 |
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93 | this._.push(
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94 | "A", r, ",", r, ",0,0,", +(y01 * x20 > x01 * y20), ",", this._x1 = x1 + t21 * x21, ",", this._y1 = y1 + t21 * y21
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95 | );
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96 | }
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97 | },
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98 | arc: function(x, y, r, a0, a1, ccw) {
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99 | x = +x, y = +y, r = +r;
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100 | var dx = r * Math.cos(a0),
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101 | dy = r * Math.sin(a0),
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102 | x0 = x + dx,
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103 | y0 = y + dy,
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104 | cw = 1 ^ ccw,
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105 | da = ccw ? a0 - a1 : a1 - a0;
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106 |
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107 |
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108 | if (r < 0) throw new Error("negative radius: " + r);
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109 |
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110 |
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111 | if (this._x1 === null) {
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112 | this._.push(
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113 | "M", x0, ",", y0
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114 | );
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115 | }
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116 |
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117 |
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118 | else if (Math.abs(this._x1 - x0) > epsilon || Math.abs(this._y1 - y0) > epsilon) {
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119 | this._.push(
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120 | "L", x0, ",", y0
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121 | );
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122 | }
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123 |
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124 |
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125 | if (!r) return;
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126 |
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127 |
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128 | if (da > tauEpsilon) {
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129 | this._.push(
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130 | "A", r, ",", r, ",0,1,", cw, ",", x - dx, ",", y - dy,
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131 | "A", r, ",", r, ",0,1,", cw, ",", this._x1 = x0, ",", this._y1 = y0
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132 | );
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133 | }
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134 |
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135 |
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136 | else {
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137 | if (da < 0) da = da % tau + tau;
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138 | this._.push(
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139 | "A", r, ",", r, ",0,", +(da >= pi), ",", cw, ",", this._x1 = x + r * Math.cos(a1), ",", this._y1 = y + r * Math.sin(a1)
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140 | );
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141 | }
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142 | },
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143 | rect: function(x, y, w, h) {
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144 | this._.push("M", this._x0 = this._x1 = +x, ",", this._y0 = this._y1 = +y, "h", +w, "v", +h, "h", -w, "Z");
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145 | },
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146 | toString: function() {
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147 | return this._.join("");
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148 | }
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149 | };
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150 |
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151 | exports.path = path;
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152 |
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153 | Object.defineProperty(exports, '__esModule', { value: true });
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154 |
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155 | })); |
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