Class GMatrix¶
This class is a traditional homongenous matrix for graphics transforms. This class is backed by numpy for fast computation. There are no publicly accessible attributes, as it is not safe to access the internals. It is only intended for coordinate space transforms.
Attributes¶
The class GMatrix does not have any accessible attributes. All modifications to a GMatrix instance should take place through the methods.
Methods¶
The class GMatrix has overloaded the operation * to support matrix multiplication. All multiplication is pre-multiplication (e.g. mutliplication by transposes). This makes it easier to read linear transformations. In addition, it has the following methods.
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copy()¶ Returns: a copy of this Matrix
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inverse()¶ Returns: the inverse of this matrix
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invert()¶ Inverts this matrix in place
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transpose()¶ Returns: the transpose of this matrix
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translate(x=0, y=0, z=0)¶ Translates this matrix (in-place) by the given amount
Parameter: x – x-coordinate of translation (default 0) Precondition: an int or float
Parameter: y – y-coordinate of translation (default 0) Precondition: an int or float
Parameter: z – z-coordinate of translation (default 0) Precondition: an int or float
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rotate(ang=0, x=0, y=0, z=0)¶ Rotates this matrix (in place) about the given axis
The rotation angle is given in degrees, not radians. Rotation is counterclockwise around the angle of rotation.
Parameter: ang – angle of rotation in degrees (default 0) Precondition: an int or float
Parameter: x – x-coordinate of rotation axis (default 0) Precondition: an int or float
Parameter: y – y-coordinate of rotation axis (default 0) Precondition: an int or float
Parameter: z – z-coordinate of rotation axis (default 0) Precondition: an int or float
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scale(x=1, y=1, z=1)¶ Scales this matrix (in-place) by the given amount
Parameter: x – x-coordinate of the scale (default 1) Precondition: an int or float
Parameter: y – y-coordinate of the scale (default 1) Precondition: an int or float
Parameter: z – z-coordinate of the scale (default 1) Precondition: an int or float
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transform(point)¶ Returns: The given point transformed by this matrix
The value returned is a GPoint.
Parameter: point – the point to transform Precondition: a GPoint