Position Class
The position class holds a single 3 component position. A position is a single point in space, and it's important to use a position or vector as appropriate for the data that is being calculated, since matrix operations on them will end in different results. When being multiplied by a Matrix, this class will implicitly have a 4th component (W component) of 1. If the Matrix is a projection matrix that will cause the W component to become something other than 1, all 4 components will be divided by W to make the position homogeneous again. A new position can be created without any arguments, with 3 arguments for the x,y,z values, or with a single argument which is a variable that has 3 entries such as a list of length 3, or another position or vector.
Examples of creating a position:
p = tdu.Position() # starts as (0, 0, 0)
p2 = tdu.Position(1, 5, 0)
values = [0, 1, 0]
p3 = tdu.Position(values)
Members
x → float :
Gets or sets the X component of the position.
y → float :
Gets or sets the Y component of the position.
z → float :
Gets or sets the Z component of the position.
Methods
translate(x, y, z)→ None:
Translates the position by the specified values.
- x, y, z - The values to translate by.
p.translate(5, 2, 0)
scale(x, y, z)→ None:
Scales each component of the position by the specified values.
- x, y, z - The values to scale each component of the position by.
p.scale(1, 2, 1)
copy()→ tdu.Position:
Returns a new position that is a copy of the position.
newV = v.copy()
Special Functions[edit]
tdu.Position[i]→ float:
Gets or sets the component of the position specified by i, where i can be 0, 1, or 2.
y = p[1] p[1] = y + 2.0
tdu.Position * float→ tdu.Position:
Scales the position by the give float scalar and returns a new Position as the result.
p = p * 0.1 p = 0.1 * p
tdu.Position + float→ tdu.Position:
Adds the given scalar to all 3 components of the position and returns a new position as the result.
p = p + 1.2 p = 1.2 + p
tdu.Position - float→ tdu.Position:
Subtracts the given scalar from all 3 components of the position and returns a new position as the result.
p = p - 1.2 p = 1.2 - p
tdu.Vector + tdu.Position→ tdu.Position:
Adds the vector to the position. ie. it displaces the given position by the vector. Returns a new position as the result.
p2 = v + p1 p2 = p1 + v
tdu.Position - tdu.Vector→ tdu.Position:
Subtracts the vector from the position. Notice that the reverse is not a legal operation: subtracting a position from a vector does not have any meaning. Returns a new position with the results.
p2 = p1 - v
tdu.Position - tdu.Position→ tdu.Vector:
Subtracts the two positions to create a vector that is pointing from the 2nd one to the 1st one, with length equal to the distance between the positions.
v = p1 - p2
tdu.Position += float→ None:
Adds the given scalar to all 3 components of the position, the position will contain the result of the operation.
p += 0.1
tdu.Position += tdu.Vector→ None:
Displaces the position by the given vector, the position will contain the result of the operation.
p += v
tdu.Position -= float→ None:
Subtracts the given scalar from all 3 components of the position, the position will contain the result of the operation.
p -= 0.4
tdu.Position -= tdu.Vector→ None:
Displaces the position by the given vector, the position will contain the result of the operation.
p -= v
tdu.Matrix * tdu.Position→ tdu.Position:
Multiplies the Position by the matrix and returns the a new position as the result.
p2 = m * p1
tdu.Position / float→ tdu.Position:
Divides each component of the position by the scalar and returns the a new position as the result.
p2 = p1 / 2.0
tdu.Position *= tdu.Matrix→ None:
Multiplies the position by the matrix, the position will contain the result. The is position multiplied on the right of the matrix. It is the equivalent of doing Position = Matrix * Position.
p *= m
tdu.Position *= float→ None:
Scales all 3 components of the position by the given scalar. The position will contain the result.
p *= 1.3
tdu.Position *= tdu.Position→ None:
Component-wise multiplies the 3 components of the first position by the 3 components of the 2nd position.
p1 *= p2
abs(tdu.Position)→ tdu.Position:
Returns a new position with all 3 components being the absolute value of the given position's components.
p2 = abs(p1)
-tdu.Position→ tdu.Position:
Returns a new position with all 3 component's being negated.
p2 = -p1
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