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79 lines
1.5 KiB
C++
79 lines
1.5 KiB
C++
#include <mystdlib.h>
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#include <myadt.hpp>
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#include <csg.hpp>
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namespace netgen
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{
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CircleCurve2d :: CircleCurve2d (const Point<2> & acenter, double arad)
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{
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center = acenter;
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rad = arad;
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}
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void CircleCurve2d :: Project (Point<2> & p) const
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{
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Vec<2> v = p - center;
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v *= rad/v.Length();
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p = center + v;
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}
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void CircleCurve2d :: NormalVector (const Point<2> & p, Vec<2> & n) const
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{
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n = p - center;
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n /= n.Length();
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}
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QuadraticCurve2d :: QuadraticCurve2d ()
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{
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cxx = cyy = cxy = cx = cy = c = 0;
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}
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void QuadraticCurve2d :: Read (istream & ist)
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{
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ist >> cxx >> cyy >> cxy >> cx >> cy >> c;
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}
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void QuadraticCurve2d :: Project (Point<2> & p) const
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{
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double f, x, y, gradx, grady, grad2;
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int its = 0;
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x = p(0);
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y = p(1);
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do
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{
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f = cxx * x * x + cyy * y * y + cxy * x * y + cx * x + cy * y + c;
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gradx = 2 * cxx * x + cxy * y + cx;
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grady = 2 * cyy * y + cxy * x + cy;
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grad2 = gradx * gradx + grady * grady;
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x -= f * gradx / grad2;
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y -= f * grady / grad2;
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// (*mycout) << "x = " << x << " y = " << y << " f = " << f << endl;
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its++;
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}
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while (fabs (f) > 1e-8 && its < 20);
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if (its >= 20)
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cerr << "QuadraticCurve2d::Project: many iterations, f = " << f << endl;
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p(0) = x;
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p(1) = y;
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}
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void QuadraticCurve2d :: NormalVector (const Point<2> & p, Vec<2> & n) const
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{
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n(0) = 2 * cxx * p(0) + cxy * p(1) + cx;
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n(1) = 2 * cyy * p(1) + cxy * p(0) + cy;
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n.Normalize();
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}
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}
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