Sha256: ce437a3e881c1cca1ec25a9588373165814746ee25636210e45fcbff7fe4a46c
Contents?: true
Size: 1013 Bytes
Versions: 6
Compression:
Stored size: 1013 Bytes
Contents
package org.sunflow.image;
public class RegularSpectralCurve extends SpectralCurve {
private final float[] spectrum;
private final float lambdaMin, lambdaMax;
private final float delta, invDelta;
public RegularSpectralCurve(float[] spectrum, float lambdaMin, float lambdaMax) {
this.lambdaMin = lambdaMin;
this.lambdaMax = lambdaMax;
this.spectrum = spectrum;
delta = (lambdaMax - lambdaMin) / (spectrum.length - 1);
invDelta = 1 / delta;
}
@Override
public float sample(float lambda) {
// reject wavelengths outside the valid range
if (lambda < lambdaMin || lambda > lambdaMax) {
return 0;
}
// interpolate the two closest samples linearly
float x = (lambda - lambdaMin) * invDelta;
int b0 = (int) x;
int b1 = Math.min(b0 + 1, spectrum.length - 1);
float dx = x - b0;
return (1 - dx) * spectrum[b0] + dx * spectrum[b1];
}
}
Version data entries
6 entries across 6 versions & 1 rubygems