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2D vector rotation

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This commit is contained in:
Anonimus 2025-09-29 09:13:14 -04:00
parent d013159ad9
commit fbc33d1517
2 changed files with 31 additions and 0 deletions
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29
src/m_fixed.c
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@ -210,6 +210,35 @@ vector2_t *FV2_Negate(vector2_t *a_1)
return FV2_NegateEx(a_1, a_1);
}
vector2_t *FV2_RotateEx(const vector2_t *a_1, vector2_t *a_o, fixed_t ang_fixed)
{
fixed_t sine, cosine;
fixed_t x1, y1, x2, y2;
angle_t ang = FixedAngle(ang_fixed);
// Precalculate sine and cosine
sine = FSIN(ang);
cosine = FCOS(ang);
// X vector: x1 (cos), y1 (sin)
x1 = FixedMul(a_1->x, cosine);
y1 = FixedMul(a_1->x, sine);
// Y vector: x2 (-sin), y2 (cos)
x2 = FixedMul(a_1->y, -sine);
y2 = FixedMul(a_1->y, cosine);
a_o->x = x1 + x2;
a_o->y = y1 + y2;
return a_o;
}
vector2_t *FV2_Rotate(vector2_t *a_1, fixed_t ang_fixed)
{
return FV2_RotateEx(a_1, a_1, ang_fixed);
}
boolean FV2_Equal(const vector2_t *a_1, const vector2_t *a_2)
{
fixed_t Epsilon = FRACUNIT / FRACUNIT;

2
src/m_fixed.h
View file

@ -283,6 +283,8 @@ fixed_t FV2_NormalizeEx(const vector2_t *a_normal, vector2_t *a_o);
fixed_t FV2_Normalize(vector2_t *a_normal);
vector2_t *FV2_NegateEx(const vector2_t *a_1, vector2_t *a_o);
vector2_t *FV2_Negate(vector2_t *a_1);
vector2_t *FV2_RotateEx(const vector2_t *a_1, vector2_t *a_o, fixed_t ang_fixed);
vector2_t *FV2_Rotate(vector2_t *a_1, fixed_t ang_fixed);
boolean FV2_Equal(const vector2_t *a_1, const vector2_t *a_2);
fixed_t FV2_Dot(const vector2_t *a_1, const vector2_t *a_2);
vector2_t *FV2_Point2Vec (const vector2_t *point1, const vector2_t *point2, vector2_t *a_o);