Graphmath.Vec2
This is the 2D mathematics library for graphmath.
Summary
| add(a, b) |
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| create() |
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| create(vec) |
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| create(x, y) |
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| dot(a, b) |
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| length(a) |
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| length_manhattan(a) |
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| length_squared(a) |
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| lerp(a, b, t) |
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| multiply(a, b) |
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| near(a, b, distance) |
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| normalize(a) |
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| perp_prod(a, b) |
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| project(a, b) |
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| rotate(a, theta) |
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| scale(a, scale) |
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| subtract(a, b) |
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Functions
Specs:
- add([float], [float]) :: [float]
add( a, b) adds a vec2 (a) to a vec2 (b).
It returns a list of the form [ ax + bx, ay + by ].
Specs:
- create :: [float]
create() creates a zero vec2.
It will return a list of the form [0.0,0.0].
Specs:
- create([float]) :: [float]
create(vec) creates a vec2 of value (x,y) out of a list of 2 or more numbers.
It will return a list of the form [x,y].
Specs:
- create(float, float) :: [float]
create(x,y) creates a vec2 of value (x,y).
It will return a list of the form [x,y].
Specs:
- dot([float], [float]) :: float
dot( a, b) finds the dot (inner) product of a vec2 (a) with another vec2 (b).
It returns a float of the value (axbx + ayby).
Specs:
- length([float]) :: float
length(a) finds the length (L2 norm) of a vec2 (a).
The length is the square root of the sum of the squares of the components.
It returns a float of the value ( sqrt(axax + ayay).
Specs:
- length_manhattan([float]) :: float
length_manhattan(a) finds the Manhattan (L1 norm) length of a vec2 (a).
The Manhattan length is the sum of the components.
It returns a float of the value (ax + ay).
Specs:
- length_squared([float]) :: float
length_squared(a) finds the square of the length of a vec2 (a).
In many cases, this is sufficient for comparisions and avaoids a sqrt.
It returns a float of the value (axax + ayay).
Specs:
- lerp([float], [float], float) :: [float]
lerp(a,b,t) is used to linearly interpolate between two given vectors a and b along an interpolant t.
The interpolant t is on the domain [0,1]. Behavior outside of that is undefined.
Specs:
- multiply([float], [float]) :: [float]
multiply( a, b) mulitplies element-wise a vec2 (a) by a vec2 (b).
It returns a list of the form [ ax*bx, ay*by ].
Specs:
- near([float], [float], float) :: boolean
near(a,b, distance) checks whether two vectors are within a length of each other.
Specs:
- normalize([float]) :: [float]
normalize(a) finds the unit vector with the same direction as a vec2 (a).
This is done by dividing each component by the vector’s magnitude.
It returns a list of the form [ normx, normy ].
Specs:
- perp_prod([float], [float]) :: float
perp_prod( a, b) finds the perpindicular product of a vec2 (a) with another vec2 (b).
The perpindicular product is the magnitude of the cross-product between the two vectors.
It returns a float of the value (axby - bxay).
Specs:
- project([float], [float]) :: [float]
project(a,b) projects one vector onto another, and returns the resulting image.
Specs:
- rotate([float], float) :: [float]
rotate(a,theta) rotates a vec2 (a) CCW about the +Z axis theta radians.
Specs:
- scale([float], float) :: [float]
scale( a, scale) uniformly scales a vec2 (a) by an amount (x).
It returns a list of the form [ ax*scale, ay*scale ].