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47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
//
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// Copyright (C) 2015 Greg Landrum
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//
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// @@ All Rights Reserved @@
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// This file is part of the RDKit.
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// The contents are covered by the terms of the BSD license
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// which is included in the file license.txt, found at the root
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// of the RDKit source tree.
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//
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#include <GraphMol/MolDraw2D/MolDraw2DDetails.h>
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#include <cmath>
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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// ****************************************************************************
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namespace RDKit {
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namespace MolDraw2D_detail {
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// implementation from $RDBASE/rdkit/sping/pid.py
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void arcPoints(const Point2D &cds1,const Point2D &cds2,
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std::vector< Point2D > &res,
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float startAng,float extent){
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// Note: this implementation is simple and not particularly efficient.
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float xScale = (cds2.x-cds1.x)/2.0;
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float yScale = (cds2.y-cds1.y)/2.0;
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if(xScale<0) xScale *= -1;
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if(yScale<0) yScale *= -1;
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float x = std::min(cds1.x,cds2.x)+xScale;
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float y = std::min(cds1.y,cds2.y)+yScale;
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int steps = std::max(static_cast<int>(extent*2),5);
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float step = M_PI*extent/(180*steps);
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float angle = M_PI*startAng/180;
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for(unsigned int i=0;i<=steps;++i){
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Point2D point(x+xScale*cos(angle),
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y-yScale*sin(angle));
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res.push_back(point);
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angle += step;
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}
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}
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}
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}
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