Difference between revisions of "IC Python API:RLPy RVector2"
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| − | The “less than” operator. Similar to string comparison: Compare the first element (x), if equal then compare the second element (y). When (y) is greater than or equal | + | The “less than” operator. Similar to string comparison: Compare the first element (x), return '''False''' when greater and '''True''' when less, else, if equal then compare the second element (y). When (y) is greater than or equal return '''False''' else return '''True'''. |
<syntaxhighlight lang="Python"> | <syntaxhighlight lang="Python"> | ||
Revision as of 22:44, 19 February 2020
- Main article: Modules.
Description
2D Vector math class for float values. This class provides access to RLPy's internal vector math library allowing vectors to be handled effortlessly, and in a manner compatible with internal RLPy data structures. It also supports operators and vector related functions.
RVector2 also provides some constants for your convenience:
| Constant | Description |
|---|---|
| RVector2.ZERO | 2D zero vector: (0, 0) |
| RVector2.UNIT_X | 2D x unit vector: (1, 0) |
| RVector2.UNIT_Y | 2D y unit vector: (0, 1) |
| RVector2.UNIT_XY | 2D vector: (1, 1) |
Constructors & Destructors
__init__
Initialize a new RVector2 object as a 2D zero vector: (0, 0).
a = RLPy.RVector2()
__init__( self, x, y )
Initialize a new RVector2 object as a 2D vector: (x, y).
a = RLPy.RVector2(1, 2)
Parameters
x [IN] a numerical value for x coordinate - float or int
y [IN] a numerical value for y coordinate - float or int
__init__( self, args )
Initialize a new RVector2 object with another RVector2 object: args. This new RVector2 object has the same value as args.
a = RLPy.RVector2(1, 2)
b = RLPy.RVector2(a)
Operators
==
The “equal to” operator.
a = RLPy.RVector2(1, 2)
b = a
print(a == b) #True
!=
The “not equal to” operator.
a = RLPy.RVector2()
b = RLPy.RVector2(1, 2)
print(a != b) #True
<
The “less than” operator. Similar to string comparison: Compare the first element (x), return False when greater and True when less, else, if equal then compare the second element (y). When (y) is greater than or equal return False else return True.
a = RLPy.RVector2(0, 0)
b = RLPy.RVector2(0, 1)
c = RLPy.RVector2(1, 0)
d = RLPy.RVector2(0, 0)
print(a < b) #True
print(b < c) #True
print(a < d) #False
>
The “greater than” operator. 這個運算子作用在 RVector2 的比對方式類似字串比對. 先比對一個元素(x), 比較大就回傳 true, 比較小就回傳 false, 如果數值一樣就繼續比對第二個元素(y), 比對方式與第一個元素相同, 但如果數值一樣就回傳 false.
a = RLPy.RVector2(0, 0)
b = RLPy.RVector2(0, 1)
c = RLPy.RVector2(1, 0)
d = RLPy.RVector2(0, 0)
print(b > a) #True
print(c > b) #True
print(d > a) #False
<=
The “less than or equal to” operator. 這個運算子作用在 RVector2 的比對方式類似字串比對. 先比對一個元素(x), 比較小就回傳 true, 比較大就回傳 false, 如果數值一樣就繼續比對第二個元素(y), 比對方式與第一個元素相同, 但如果數值一樣就回傳 true.
a = RLPy.RVector2(0, 0)
b = RLPy.RVector2(0, 1)
c = RLPy.RVector2(1, 0)
d = RLPy.RVector2(0, 0)
print(a <= b) #True
print(b <= c) #True
print(a <= d) #True
>=
The “greater than or equal to” operator. 這個運算子作用在 RVector2 的比對方式類似字串比對. 先比對一個元素(x), 比較大就回傳 true, 比較小就回傳 false, 如果數值一樣就繼續比對第二個元素(y), 比對方式與第一個元素相同, 但如果數值一樣就回傳 true.
a = RLPy.RVector2(0, 0)
b = RLPy.RVector2(0, 1)
c = RLPy.RVector2(1, 0)
d = RLPy.RVector2(0, 0)
print(b >= a) #True
print(c >= b) #True
print(d >= a) #True
+
The “addition” operator. Perform 2D vector addition.
a = RLPy.RVector2(0, 1)
b = RLPy.RVector2(1, 2)
c = a + b
print(str(c.x) + ', ' + str(c.y)) #1.0, 3.0
-
The “subtraction” operator. Perform 2D vector subtraction.
a = RLPy.RVector2(0, 1)
b = RLPy.RVector2(1, 3)
c = b - a
print(str(c.x) + ', ' + str(c.y)) #1.0, 2.0
*
The “multiplication” operator. 當第二個運算元是scalar (int or float)時, perform 2D vector multiplication with scalar. 當第二個運算元是 RVector2 時則會把對應元素相乘.
a = RLPy.RVector2(1, 2)
b = a * 2
c = RLPy.RVector2(2, 3)
d = a * c
print(str(b.x) + ', ' + str(b.y)) #2.0, 4.0
print(str(d.x) + ', ' + str(d.y)) #2.0, 6.0
/
The “division” operator. 當第二個運算元是scalar (int or float)時, perform 2D vector multiplication with scalar (multiply with 1/2nd-operand). 當第二個運算元是 RVector2 時則會把對應元素相除.
a = RLPy.RVector2(1, 2)
b = a / 2
c = RLPy.RVector2(2, 3)
d = a / c
print(str(b.x) + ', ' + str(b.y)) #0.5, 1.0
print(str(d.x) + ', ' + str(d.y)) #0.5, 0.6666666865348816
-
The “unary minus” operator. Inverse the sign of each element.
a = RLPy.RVector2(1, 2)
b = -a
print(str(b.x) + ', ' + str(b.y)) #-1.0, -2.0
+=
The “addition assignment” operator.
a = RLPy.RVector2(0, 1)
b = RLPy.RVector2(1, 2)
a += b
print(str(a.x) + ', ' + str(a.y)) #1.0, 3.0
-=
The “subtraction assignment” operator.
a = RLPy.RVector2(0, 1)
b = RLPy.RVector2(1, 2)
a -= b
print(str(a.x) + ', ' + str(a.y)) #-1.0, -1.0
*=
The “multiplication assignment” operator. Please refer to * operator for calculation method.
a = RLPy.RVector2(1, 2)
a *= 2
b = RLPy.RVector2(1, 2)
c = RLPy.RVector2(2, 3)
b *= c
print(str(a.x) + ', ' + str(a.y)) #2.0, 4.0
print(str(b.x) + ', ' + str(b.y)) #2.0, 6.0
/=
The “division assignment” operator. Please refer to / operator for calculation method.
a = RLPy.RVector2(1, 2)
a /= 2
b = RLPy.RVector2(1, 2)
c = RLPy.RVector2(2, 3)
b /= c
print(str(a.x) + ', ' + str(a.y)) #0.5, 1.0
print(str(b.x) + ', ' + str(b.y)) #0.5, 0.6666666865348816
Member Functions
AddWithWeight
RLPy.RVector2.AddWithWeight ( self, vSrc, fWeight )
Add a vector with weight.
Parameters
vSrc [IN] The vector to add - RLPy.RVector2
fWeight [IN] The value of weight - float
Dot
RLPy.RVector2.Dot ( self, vV )
Calculate dot production of the two vectors.
Parameters
vV [IN] The vector - RLPy.RVector2
Returns
Inverse
RLPy.RVector2.Inverse ( self )
Inverse this vector.
Returns
Length
RLPy.RVector2.Length ( self )
Length of the vector.
Returns
Normalize
RLPy.RVector2.Normalize ( self )
Normalizes this vector.
Returns
SetX
RLPy.RVector2.SetX ( self, tX )
Set the value of the x-axis.
Parameters
tX [IN] the value of the x-axis - float
SetY
RLPy.RVector2.SetY ( self, tY )
Set the value of the y-axis.
Parameters
tX [IN] the value of the y-axis.
SquaredLength
RLPy.RVector2.SquaredLength ( self )
Squared length of the vector.
Returns
X
RLPy.RVector2.X ( self, args )
Get the value of the x-axis.
Returns
Y
RLPy.RVector2.Y ( self, args )
Get the value of the y-axis.
