GMS2 Round function for Precision Math

Introduction

In GameMaker Studio 2, the round function can be used to round a number to the nearest integer. But what if you need to round to a certain number of decimal places? This is where the round function for precision math comes in.

Usage

The round function for precision math takes two arguments: the number to round and the number of decimal places to round to. Here's an example:

var num = 3.14159;
var roundedNum = round(num, 2); // this will round num to 2 decimal places

The resulting roundedNum variable will be 3.14 since we specified that we wanted to round to 2 decimal places.

Implementation

Here's the code for the round function for precision math:

// rounds a number to the specified number of decimal places
function round(num, places) {
    var multiplier = 10 ^ places;
    return Math.round(num * multiplier) / multiplier;
}

This function works by first multiplying the input number by 10 raised to the power of the number of decimal places we want to round to. This gives us an integer that we can then round to the nearest whole number using Math.round. Finally, we divide the result by the same multiplier to get back to the desired number of decimal places.

Conclusion

The round function for precision math is a useful tool for game developers who need to perform calculations that require a certain level of accuracy. With this function in your arsenal, you can rest assured that your numbers will be rounded properly for your game logic to work as intended.