mirror of
https://github.com/subsurface/subsurface.git
synced 2024-11-28 13:10:19 +00:00
17 lines
474 B
C
17 lines
474 B
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
#ifndef INTERPOLATE_H
|
||
|
|
#define INTERPOLATE_H
|
||
|
|
|
||
|
|
/* Linear interpolation between 'a' and 'b', when we are 'part'way into the 'whole' distance from a to b */
|
||
|
|
static inline int interpolate(int a, int b, int part, int whole)
|
||
|
|
{
|
||
|
|
/* It is doubtful that we actually need floating point for this, but whatever */
|
||
|
|
if (whole) {
|
||
|
|
double x = (double)a * (whole - part) + (double)b * part;
|
||
|
|
return (int)lrint(x / whole);
|
||
|
|
}
|
||
|
|
return (a+b)/2;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|