CODEWITHSUNDEEP
c#c#-4.0
Brutus Cruciatus
Brutus Cruciatus

Reputation: 414

Set a zero point and if the value is lower or higher than this it is shown as -value or +value

I have an input of 0 to 359 (ie a compass).

I want to set a zero point and if the value is lower or higher than this it is shown as -value or +value.

Example:

Zero Point: 2
Input: 340 => Output: -22
Input: 22 => Output: 20

or

Zero Point: 40
Input: 30 => Output: -10
Input: 50 => Output: 10

So no matter where the compass 'is', the output is always relative to the zero point.

PS: Or even shorter: How do I convert a repeating sequence of 0->359 into a linear sequence that I can work with like with a normal number line? So if 359 is reached 2 times counting upwards the function tells me it is at 720(I might've missed the right value here for 1° or 2°) and not 359?

Upvotes: 1

Views: 371

Answers (3)

nima
nima

Reputation: 6733

int result = input - zero > 180 ? input - zero - 360 : input - zero;

Upvotes: 0

lisp
lisp

Reputation: 4198

Assuming you want an output from -179 to 180 and the zeropoint can be from 0 to 359

int output(int deg, int zeropoint)
    {
        var relative = deg - zeropoint;
        if (relative > 180)
            relative -= 360;
        else if (relative < -179)
            relative += 360;
        return relative;
    }

Upvotes: 2

Bas
Bas

Reputation: 27105

I think this does what you ask, but I'm not confident about your requirements. Basically, given a 'clock' of a certain size, a point to get the relative distance from and an input value, it will find the smallest distance to the point on the 'clock', either negative or positive.

    static void Main(string[] args)
    {
        Console.WriteLine(getRelativeValue(2, 360, 340)); //-22
        Console.WriteLine(getRelativeValue(2, 360, 22));  // 20
        Console.WriteLine(getRelativeValue(2, 360, 178)); // 176
        Console.Read();
    }

    static int getRelativeValue(int point, int upperBound, int value)
    {
        value %= upperBound;
        int lowerBoundPoint = -(upperBound - value + point);
        int upperBoundPoint = (value - point);

        if (Math.Abs(lowerBoundPoint) > Math.Abs(upperBoundPoint))
        {
            return upperBoundPoint;
        }
        else
        {
            return lowerBoundPoint;
        }
    }

Upvotes: 2

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