new Vector2(xopt, yopt)
    a vector 2 class
    Parameters:
| Name | Type | Attributes | Default | Description | 
|---|---|---|---|---|
| x | number | <optional> | 0 | |
| y | number | <optional> | 0 | 
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Methods
add()
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addVectors()
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angle()
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clone()
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copy()
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distanceTo()
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distanceToSquared()
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fromArray()
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getLength()
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getLengthSquared()
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lerpVectors()
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max()
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min()
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multiplyScalar()
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normalize()
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set()
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sub()
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subtract()
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subVectors()
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