cyclicDistance - absolute distance between two values on a cyclic scale (e.g. angles) [1035274]

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JavaX fragment (include) [tags: use-pretranspiled]

// cycleLength e.g. 360
static double cyclicDistance(double a, double b, double cycleLength) {
  a = mod(a, cycleLength); // a is now between 0 and 360
  b = mod(b, cycleLength); // b is now between 0 and 360
  
  // if e.g. a is 40 and b is 50, then distance is 10
  // if e.g. a is 10 and b is 350, then distance is 20
  // if e.g. b is 10 and a is 350, then distance is 20
  double diff = absDiff(a, b);
  if (a < b)
    diff = min(diff, a+cycleLength-b);
  else
    diff = min(diff, b+cycleLength-a);
  ret diff;
}

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Snippet ID:

#1035274

Snippet name:

cyclicDistance - absolute distance between two values on a cyclic scale (e.g. angles)

Eternal ID of this version:

#1035274/2

Text MD5:

cb37c4cdad2ce8fe364a64d57b16fa99

Transpilation MD5:

643e0fb21613d3f592eb466171ed90f0

Author:

stefan

Category:

javax / maths

Type:

JavaX fragment (include)

Public (visible to everyone):

Yes

Archived (hidden from active list):

Created/modified:

2022-04-28 20:44:35

Source code size:

532 bytes / 15 lines

Pitched / IR pitched:

No / No

Views / Downloads:

59 / 91

Version history:

1 change(s)

Referenced in:

[show references]

1	// cycleLength e.g. 360
2	static double cyclicDistance(double a, double b, double cycleLength) {
3	a = mod(a, cycleLength); // a is now between 0 and 360
4	b = mod(b, cycleLength); // b is now between 0 and 360
5
6	// if e.g. a is 40 and b is 50, then distance is 10
7	// if e.g. a is 10 and b is 350, then distance is 20
8	// if e.g. b is 10 and a is 350, then distance is 20
9	double diff = absDiff(a, b);
10	if (a < b)
11	diff = min(diff, a+cycleLength-b);
12	else
13	diff = min(diff, b+cycleLength-a);
14	ret diff;
15	}