38 lines
787 B
Plaintext
38 lines
787 B
Plaintext
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module Interpolator;
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import std.io.*;
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typedef function double (double) interpolator_t;
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public main(args : String[]) : int
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{
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interpolator_t i1 = getInterpolator(1, 5, 4);
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interpolator_t i2 = getInterpolator(10, 2, 5);
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assert( i1(0) =~ 1 );
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assert( i1(4) =~ 5 );
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assert( i1(3) =~ 4.0 );
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assert( i2(0) =~ 10 );
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assert( i2(5) =~ 2 );
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assert( i2(1.0) =~ 8.4 );
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assert( i2(2.0) =~ 6.8 );
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return 0;
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}
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/*
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* Create and return a linear interpolator functor which interpolates
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* between (0.0, x1) and (sep, x2), returning the output y-value
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*/
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private getInterpolator(x1 : double, x2 : double, sep : double) : interpolator_t
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{
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assert (sep > 0.0);
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return function double (x : double)
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{
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return x * (x2 - x1) / sep + x1;
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}
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}
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