nerdcruft/libcruft-util
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Add trun, cubic, and quintic lerp methods

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This commit is contained in:
Danny Robson 2012-05-17 14:17:42 +10:00
parent d2c174f2e1
commit 6305261270
2 changed files with 23 additions and 2 deletions
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18
lerp.cpp
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@ -31,6 +31,10 @@ lerp::sigmoid (double val) {
} }
double lerp::trunc (double a, double, double)
{ return a; }
double double
lerp::linear (double a, double b, double weight) { lerp::linear (double a, double b, double weight) {
CHECK (weight >= 0 && weight <= 1.0); CHECK (weight >= 0 && weight <= 1.0);
@ -47,3 +51,17 @@ lerp::cosine (double a, double b, double weight) {
return a * (1.0 - f) + b * f; return a * (1.0 - f) + b * f;
} }
double
lerp::cubic (double a, double b, double weight) {
CHECK (weight >= 0.0 && weight <= 1.0);
double t = weight * weight * (3.0 - 2.0 * weight);
return a * (1.0 - t) + b * t;
}
double
lerp::quintic (double a, double b, double weight) {
double t = weight * weight * weight * (weight * (weight * 6.0 - 15.0) + 10.0);
return a * (1.0 - t) + b * t;
}

3
lerp.hpp
View File

@ -25,6 +25,9 @@ namespace lerp {
double linear (double a, double b, double weight); double linear (double a, double b, double weight);
double cosine (double a, double b, double weight); double cosine (double a, double b, double weight);
double cubic (double a, double b, double weight);
double quintic (double a, double b, double weight);
double trunc (double a, double b, double weight);
} }
#endif #endif