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angle utility methods

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This commit is contained in:
Noel Berry
2020-10-11 13:50:44 -07:00
parent 1af8669441
commit 474ee631b2
4 changed files with 21 additions and 0 deletions
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6
public/blah/math/calc.cpp
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@ -119,6 +119,12 @@ float Calc::angle_diff(float radians_a, float radians_b)
return mod((radians_b - radians_a) + PI, TAU) - PI;
}
float Calc::angle_lerp(float radians_a, float radians_b, float p)
{
const auto shortest_angle = mod(mod(radians_b - radians_a, TAU) + (TAU + PI), TAU) - PI;
return radians_a + mod(shortest_angle * p, TAU);
}
float Calc::lerp(float a, float b, float t)
{
return a + (b - a) * t;

2
public/blah/math/calc.h
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@ -61,6 +61,8 @@ namespace Blah
float snap(float val, float interval);
float angle_diff(float radians_a, float radians_b);
float angle_lerp(float radians_a, float radians_b, float p);
float lerp(float a, float b, float t);

11
public/blah/math/vec2.cpp
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@ -35,6 +35,17 @@ Vec2 Vec2::normal() const
float length = this->length();
return Vec2(x / length, y / length);
}
Vec2 Vec2::turn_right() const
{
return Vec2(y, -x);
}
Vec2 Vec2::turn_left() const
{
return Vec2(-y, x);
}
float Vec2::length() const { return sqrtf(x * x + y * y); }
float Vec2::length_squared() const { return x * x + y * y; }

2
public/blah/math/vec2.h
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@ -35,6 +35,8 @@ namespace Blah
bool operator !=(const Vec2& rhs);
Vec2 normal() const;
Vec2 turn_right() const;
Vec2 turn_left() const;
float length() const;
float length_squared() const;
Vec2 perpendicular() const;