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52 lines
1.2 KiB
52 lines
1.2 KiB
9 months ago
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#pragma once
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#include "basedata.h"
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#include "comdefs.h"
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using michlib::real;
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template<class D> class LinearInterpolator: public D
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{
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public:
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LinearInterpolator(D&& d): D(std::move(d)) {}
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real operator()(const struct Point2D& in) const
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{
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const auto gp = D::GridPos(in.x, in.y);
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if(!gp.Valid()) return NAN;
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if(gp.x == 0.0 && gp.y == 0.0) return D::V(gp.ix, gp.iy);
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real v00;
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real v10;
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real v01;
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real v11;
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bool isfill = false;
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size_t fx, fy;
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// Count fills
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for(size_t ix = 0; ix <= 1; ix++)
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for(size_t iy = 0; iy <= 1; iy++)
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{
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if(isfill && D::IsFill(gp.ix + ix, gp.iy + iy)) return NAN;
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if(D::IsFill(gp.ix + ix, gp.iy + iy))
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{
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fx = ix;
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fy = iy;
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isfill = true;
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}
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}
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v00 = D::V(gp.ix, gp.iy);
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v10 = D::V(gp.ix + 1, gp.iy);
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v01 = D::V(gp.ix, gp.iy + 1);
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v11 = D::V(gp.ix + 1, gp.iy + 1);
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if(isfill && fx == 0 && fy == 0) v00 = (v10 + v01 + v11) / 3.0;
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if(isfill && fx == 1 && fy == 0) v10 = (v00 + v01 + v11) / 3.0;
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if(isfill && fx == 0 && fy == 1) v01 = (v10 + v00 + v11) / 3.0;
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if(isfill && fx == 1 && fy == 1) v11 = (v10 + v01 + v00) / 3.0;
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return v00 + gp.y * (v01 - v00) + gp.x * ((v10 - v00) + gp.y * (v00 - v01 + v11 - v10));
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};
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};
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