1 | "use strict";
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2 | Object.defineProperty(exports, "__esModule", { value: true });
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3 | exports.arcToCubic = void 0;
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4 | var TAU = Math.PI * 2;
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5 | var mapToEllipse = function (_a, rx, ry, cosphi, sinphi, centerx, centery) {
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6 | var x = _a.x, y = _a.y;
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7 | x *= rx;
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8 | y *= ry;
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9 | var xp = cosphi * x - sinphi * y;
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10 | var yp = sinphi * x + cosphi * y;
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11 | return {
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12 | x: xp + centerx,
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13 | y: yp + centery,
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14 | };
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15 | };
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16 | var approxUnitArc = function (ang1, ang2) {
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17 |
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18 |
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19 | var a = ang2 === 1.5707963267948966
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20 | ? 0.551915024494
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21 | : ang2 === -1.5707963267948966
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22 | ? -0.551915024494
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23 | : (4 / 3) * Math.tan(ang2 / 4);
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24 | var x1 = Math.cos(ang1);
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25 | var y1 = Math.sin(ang1);
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26 | var x2 = Math.cos(ang1 + ang2);
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27 | var y2 = Math.sin(ang1 + ang2);
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28 | return [
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29 | {
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30 | x: x1 - y1 * a,
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31 | y: y1 + x1 * a,
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32 | },
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33 | {
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34 | x: x2 + y2 * a,
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35 | y: y2 - x2 * a,
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36 | },
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37 | {
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38 | x: x2,
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39 | y: y2,
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40 | },
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41 | ];
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42 | };
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43 | var vectorAngle = function (ux, uy, vx, vy) {
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44 | var sign = ux * vy - uy * vx < 0 ? -1 : 1;
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45 | var dot = ux * vx + uy * vy;
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46 | if (dot > 1) {
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47 | dot = 1;
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48 | }
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49 | if (dot < -1) {
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50 | dot = -1;
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51 | }
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52 | return sign * Math.acos(dot);
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53 | };
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54 | var getArcCenter = function (px, py, cx, cy, rx, ry, largeArcFlag, sweepFlag, sinphi, cosphi, pxp, pyp) {
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55 | var rxsq = Math.pow(rx, 2);
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56 | var rysq = Math.pow(ry, 2);
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57 | var pxpsq = Math.pow(pxp, 2);
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58 | var pypsq = Math.pow(pyp, 2);
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59 | var radicant = rxsq * rysq - rxsq * pypsq - rysq * pxpsq;
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60 | if (radicant < 0) {
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61 | radicant = 0;
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62 | }
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63 | radicant /= rxsq * pypsq + rysq * pxpsq;
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64 | radicant = Math.sqrt(radicant) * (largeArcFlag === sweepFlag ? -1 : 1);
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65 | var centerxp = ((radicant * rx) / ry) * pyp;
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66 | var centeryp = ((radicant * -ry) / rx) * pxp;
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67 | var centerx = cosphi * centerxp - sinphi * centeryp + (px + cx) / 2;
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68 | var centery = sinphi * centerxp + cosphi * centeryp + (py + cy) / 2;
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69 | var vx1 = (pxp - centerxp) / rx;
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70 | var vy1 = (pyp - centeryp) / ry;
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71 | var vx2 = (-pxp - centerxp) / rx;
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72 | var vy2 = (-pyp - centeryp) / ry;
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73 | var ang1 = vectorAngle(1, 0, vx1, vy1);
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74 | var ang2 = vectorAngle(vx1, vy1, vx2, vy2);
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75 | if (sweepFlag === 0 && ang2 > 0) {
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76 | ang2 -= TAU;
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77 | }
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78 | if (sweepFlag === 1 && ang2 < 0) {
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79 | ang2 += TAU;
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80 | }
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81 | return [centerx, centery, ang1, ang2];
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82 | };
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83 | var arcToBezier = function (_a) {
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84 | var px = _a.px, py = _a.py, cx = _a.cx, cy = _a.cy, rx = _a.rx, ry = _a.ry, _b = _a.xAxisRotation, xAxisRotation = _b === void 0 ? 0 : _b, _c = _a.largeArcFlag, largeArcFlag = _c === void 0 ? 0 : _c, _d = _a.sweepFlag, sweepFlag = _d === void 0 ? 0 : _d;
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85 | var curves = [];
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86 | if (rx === 0 || ry === 0) {
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87 | return [{ x1: 0, y1: 0, x2: 0, y2: 0, x: cx, y: cy }];
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88 | }
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89 | var sinphi = Math.sin((xAxisRotation * TAU) / 360);
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90 | var cosphi = Math.cos((xAxisRotation * TAU) / 360);
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91 | var pxp = (cosphi * (px - cx)) / 2 + (sinphi * (py - cy)) / 2;
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92 | var pyp = (-sinphi * (px - cx)) / 2 + (cosphi * (py - cy)) / 2;
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93 | if (pxp === 0 && pyp === 0) {
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94 | return [{ x1: 0, y1: 0, x2: 0, y2: 0, x: cx, y: cy }];
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95 | }
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96 | rx = Math.abs(rx);
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97 | ry = Math.abs(ry);
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98 | var lambda = Math.pow(pxp, 2) / Math.pow(rx, 2) + Math.pow(pyp, 2) / Math.pow(ry, 2);
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99 | if (lambda > 1) {
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100 | rx *= Math.sqrt(lambda);
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101 | ry *= Math.sqrt(lambda);
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102 | }
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103 | var _e = getArcCenter(px, py, cx, cy, rx, ry, largeArcFlag, sweepFlag, sinphi, cosphi, pxp, pyp), centerx = _e[0], centery = _e[1], ang1 = _e[2], ang2 = _e[3];
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104 |
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105 |
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106 |
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107 |
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108 | var ratio = Math.abs(ang2) / (TAU / 4);
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109 | if (Math.abs(1.0 - ratio) < 0.0000001) {
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110 | ratio = 1.0;
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111 | }
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112 | var segments = Math.max(Math.ceil(ratio), 1);
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113 | ang2 /= segments;
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114 | for (var i = 0; i < segments; i++) {
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115 | curves.push(approxUnitArc(ang1, ang2));
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116 | ang1 += ang2;
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117 | }
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118 | return curves.map(function (curve) {
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119 | var _a = mapToEllipse(curve[0], rx, ry, cosphi, sinphi, centerx, centery), x1 = _a.x, y1 = _a.y;
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120 | var _b = mapToEllipse(curve[1], rx, ry, cosphi, sinphi, centerx, centery), x2 = _b.x, y2 = _b.y;
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121 | var _c = mapToEllipse(curve[2], rx, ry, cosphi, sinphi, centerx, centery), x = _c.x, y = _c.y;
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122 | return { x1: x1, y1: y1, x2: x2, y2: y2, x: x, y: y };
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123 | });
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124 | };
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125 | function arcToCubic(x1, y1, rx, ry, angle, LAF, SF, x2, y2) {
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126 | var curves = arcToBezier({
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127 | px: x1,
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128 | py: y1,
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129 | cx: x2,
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130 | cy: y2,
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131 | rx: rx,
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132 | ry: ry,
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133 | xAxisRotation: angle,
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134 | largeArcFlag: LAF,
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135 | sweepFlag: SF,
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136 | });
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137 | return curves.reduce(function (prev, cur) {
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138 | var x1 = cur.x1, y1 = cur.y1, x2 = cur.x2, y2 = cur.y2, x = cur.x, y = cur.y;
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139 | prev.push(x1, y1, x2, y2, x, y);
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140 | return prev;
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141 | }, []);
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142 | }
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143 | exports.arcToCubic = arcToCubic;
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144 |
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