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Add vectorCos function

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This commit is contained in:
Miloslav Číž 2018-08-30 18:31:08 +02:00
parent 01517bd1df
commit b774d8fdd1
1 changed files with 27 additions and 0 deletions
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27
raycastlib.h
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@ -92,6 +92,13 @@ void castRayMultiHit(Ray ray, int16_t (*arrayFunc)(int16_t x, int16_t y),
Vector2D angleToDirection(Unit angle);
Unit cosInt(Unit input);
Unit sinInt(Unit input);
/// Normalizes given vector to have UNITS_PER_SQUARE length.
Vector2D normalize(Vector2D v);
/// Computes a cos of an angle between two vectors.
Unit vectorsAngleCos(Vector2D v1, Vector2D v2);
uint16_t sqrtInt(uint32_t value);
Unit dist(Vector2D p1, Vector2D p2);
Unit len(Vector2D v);
@ -395,6 +402,26 @@ void castRaysMultiHit(
}
}
Vector2D normalize(Vector2D v)
{
Vector2D result;
Unit l = len(v);
result.x = (v.x * UNITS_PER_SQUARE) / l;
result.y = (v.y * UNITS_PER_SQUARE) / l;
return result;
}
Unit vectorsAngleCos(Vector2D v1, Vector2D v2)
{
v1 = normalize(v1);
v2 = normalize(v2);
return (v1.x * v2.x + v1.y * v2.y) / UNITS_PER_SQUARE;
}
Unit degreesToUnitsAngle(int16_t degrees)
{
return (degrees * UNITS_PER_SQUARE) / 360;