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REVIEWED: Vector2Angle()

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This commit is contained in:
Ray 2023-07-04 16:58:43 +02:00
parent dd2d64e058
commit 225b4fb3e2
2 changed files with 4 additions and 12 deletions
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4
examples/others/raymath_vector_angle.c
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@ -78,9 +78,7 @@ int main(void)
DrawLineEx(v0, v2, 2.0f, RED); DrawLineEx(v0, v2, 2.0f, RED);
float startangle = 90 - Vector2LineAngle(v0, v1)*RAD2DEG; float startangle = 90 - Vector2LineAngle(v0, v1)*RAD2DEG;
DrawCircleSector(v0, 40.0f, startangle, angle + startangle, 32, Fade(GREEN, 0.6f)); DrawCircleSector(v0, 40.0f, startangle, startangle + angle - 360.0f*(angle > 180.0f), 32, Fade(GREEN, 0.6f));
//DrawCircleSector(v0, 40.0f, 90 - Vector2LineAngle(v0, v1)*RAD2DEG, angle, 32, Fade(GREEN, 0.6f));
} }
else if (angleMode == 1) else if (angleMode == 1)
{ {

12
src/raymath.h
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@ -316,15 +316,9 @@ RMAPI float Vector2Angle(Vector2 v1, Vector2 v2)
{ {
float result = 0.0f; float result = 0.0f;
float dot = v1.x*v2.x + v1.y*v2.y; // Dot product float dot = v1.x*v2.x + v1.y*v2.y;
float dotClamp = (dot < -1.0f)? -1.0f : dot; // Clamp float det = v1.x*v2.y - v1.y*v2.x;
if (dotClamp > 1.0f) dotClamp = 1.0f; result = -atan2f(det, dot);
result = acosf(dotClamp);
// Alternative implementation, more costly
//float v1Length = sqrtf((v1.x*v1.x) + (v1.y*v1.y));
//float v2Length = sqrtf((v2.x*v2.x) + (v2.y*v2.y));
//result = -acosf((v1.x*v2.x + v1.y*v2.y)/(v1Length*v2Length));
return result; return result;
} }