Solved: lerp

Linear Interpolation, more commonly known as Lerp, is a method used to calculate a point that lies between two other points on a line or curve. This technique is widely used in different fields such as computer graphics and game development. In this article, we will deep dive into what Lerp is and how to implement it in Java.

Lerp is a mathematical term that stands for linear interpolation. It’s a way to generate a value from two known values, given a fractional point between the two. This may sound quite intricate, but it’s actually a fairly simple concept. Linear interpolation is commonly used in computer graphics to approximate data where there isn’t enough detail, and in game development, to create smooth animation and transitions.

public class Lerp {
  public static float lerp(float point1, float point2, float fraction) {
    return (1 - fraction) * point1 + fraction * point2;

Understanding the Lerp Function

To better understand how Lerp works, this function takes three parameters: point1 and point2, which represent the two known values that we mentioned earlier, and fraction, which represents the fractional distance between the two points. The result is a new point which lies on the line segment that connects the two points, based on the fractional distance.

The function is quite simple and works as follows:
1. It first calculates the distance from point1 to the end point (if point1 is considered as the starting point), as if fraction represents a percentage of the whole line segment.
2. It then calculates the distance from the starting point to the required point.
3. Finally, it adds these two distances together to get the final result.

Let’s analyze this with an example:

public class Main {
  public static void main(String[] args) {
    float point1 = 1.0f;
    float point2 = 2.0f;
    float fraction = 0.5f;
    float result = Lerp.lerp(point1, point2, fraction);
    System.out.println("The interpolated point is: " + result);

Java Libraries for Interpolation

While Java does not have a built-in library for interpolation, there exist several third-party libraries that provide comprehensive support for different kinds of interpolation, including linear interpolation. The Apache Commons Math library is one such library that provides a wide array of mathematical functions, including a number of different interpolation methods.

Another popular choice is the Jzy3d library for 3D graphics, which provides tools for linear and non-linear interpolation among other features.


Linear interpolation (Lerp) is a powerful tool in many fields including animation and game development, computer graphics, physics, and statistics, to name a few. We have explored its basic concept, how it works, and how it can be implemented in Java. This is just scratching the surface, as Lerp can also be extended to 2D and 3D, which makes it an even more powerful tool. Remember, practice is the key to mastering any concept, so keep on coding and experimenting!

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