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View Code? Open in Web Editor NEW[UNMAINTAINED] a port of penner's easing equations to c++, with an openframeworks usage example [
[UNMAINTAINED] a port of penner's easing equations to c++, with an openframeworks usage example [
In C++ the order of evaluation is unspecified. That's why most of implementations here cause an undifined behavior, working correctly only sometimes or only with choosen compilers. For instance:
float Quart::easeIn (float t,float b , float c, float d) {
return c*(t/=d)*t*t*t + b;
}
C++ standard doesn't specify if t/=d
will be evaluated before t*t*t
or after, or in between.... That can lead to different results on different compilers/operating systems etc.
This code, and all others, should be rewritten as:
float Quart::easeIn (float t,float b , float c, float d) {
t /= d;
return c*t*t*t*t + b;
}
In C++ there is no performance gain in writing such one-liners, even if they don't cause undefined behavior.
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