A simple interpolation/easing library for C
How to use:
#define SLERP_H
#include "slerp.h" // (or whatever path you use)that's it!
All easing functions are avalible to view and try out at easings.net. You can access the easings functions by using the sl prefex, e.g.
float f = sl_easeInSine(0.5);and interpolate between values using the slerp function
float i = slerp(50, 75, sl_easeInSine(0.5)); // Interpolates somewhere between the values 50 and 75 using the easeInSine curve. In this example it would be exactly the halfway point of the interpolation curve and would output ~57.32.For perhaps more convenint usage, you can utilize the functionality of the slerp_to and slerp_from functions. Example:
slerp_t my_lerp = {
.type = SL_LINEAR, // Type of easing
.values = { // Values to interpolate
.from = 0,
.to = 10
},
.time = 0 // Where in the interpolation curve to start. Generally you should keep this at 0 and should a value between [0, 1].
};
float l = slerp_to(my_lerp, 0.8); // 8.0Note
If the interpolation enum is an invalid value, the easing will default to SL_LINEAR
The full list of easings and names can be seen in the slerp.h header.