I'd like to clamp calculations in the range of 0-360 in my program. I know if you have an 8-bit integer adding 255 + 1 will overflow to 0 and likewise, 0 - 1 will underflow to 255. I wrote this function as a test:
//only for negative numbers
function clampTo360 (a) {
if (a < 0) {
var b = 361 + a;
if (b > 0) {
return b;
} else {
clampTo360(b);
}
}
}
Is there a better way to code a function so the calculation 0 - 1 will return 360?
You could add 360 for getting a positive value and return the remainder.
function clampTo360(g) {
const rest = g % 360;
return rest < 0 ? 360 + rest : rest
}
console.log(clampTo360(365)); // 5
console.log(clampTo360(-5)); // 355
console.log(clampTo360(700)); // 340
console.log(clampTo360(-700)); // 20You can make use of the modulo operator here. However, underflowing inputs will result in negative values.
To avoid that you can add 360 to get a number in the interval [0; 720), and apply the modulo operator again to get a result between 0 and 360:
function clampTo360(g) {
return (g % 360 + 360) % 360
}
console.log(clampTo360(720))
console.log(clampTo360(360))
console.log(clampTo360(-360))
console.log(clampTo360(-720))