63 lines
3.0 KiB
JavaScript
63 lines
3.0 KiB
JavaScript
/*
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Copyright © 2020 Xah Lee, © 2023 P.M Kuipers
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the “Software”),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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URL: SVG Circle Arc http://xahlee.info/js/svg_circle_arc.html
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*/
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const cos = Math.cos;
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const sin = Math.sin;
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const π = Math.PI;
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const f_matrix_times = (( [[a,b], [c,d]], [x,y]) => [ a * x + b * y, c * x + d * y]);
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const f_rotate_matrix = (x => [[cos(x),-sin(x)], [sin(x), cos(x)]]);
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const f_vec_add = (([a1, a2], [b1, b2]) => [a1 + b1, a2 + b2]);
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// function modified by pmkuipers for text params
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/**
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* Create svg path text for an arc
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* @param {*} center [cx,cy] center of ellipse
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* @param {*} radius [rx,ry] major minor radius
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* @param {*} angle [t1, Δ] start angle, in radian, angle to sweep, in radian. positive.
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* @param {*} φ rotation on the whole, in radian
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* @returns a SVG path element that represent a ellipse. Text describing the arc path in an svg path element
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*/
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const svgarcpath = (([cx,cy],[rx,ry], [t1, Δ], φ ) => {
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Δ = Δ % (2*π);
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const rotMatrix = f_rotate_matrix (φ);
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const [sX, sY] = ( f_vec_add ( f_matrix_times ( rotMatrix, [rx * cos(t1), ry * sin(t1)] ), [cx,cy] ) );
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const [eX, eY] = ( f_vec_add ( f_matrix_times ( rotMatrix, [rx * cos(t1+Δ), ry * sin(t1+Δ)] ), [cx,cy] ) );
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const fA = ( ( Δ > π ) ? 1 : 0 );
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const fS = ( ( Δ > 0 ) ? 1 : 0 );
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return "M " + sX + " " + sY + " A " + [ rx , ry , φ / (2*π) *360, fA, fS, eX, eY ].join(" ");
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});
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/**
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* Create an svg arc element
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* @param {*} center [cx,cy] center of ellipse
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* @param {*} radius [rx,ry] major minor radius
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* @param {*} angle [t1, Δ] start angle, in radian, angle to sweep, in radian. positive.
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* @param {*} φ rotation on the whole, in radian
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* @returns a SVG path element that represent a ellipse.
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*/
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const svgarc = (([cx,cy],[rx,ry], [t1, Δ], φ ) => {
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const path_2wk2r = document.createElementNS("http://www.w3.org/2000/svg", "path");
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const d = svgarcpath([cx,cy],[rx,ry], [t1, Δ], φ );
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path_2wk2r.setAttribute("d", d);
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return path_2wk2r;
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});
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export {svgarc, svgarcpath}; |