Perform geometric transformations of Gate-type
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Either a numeric scalar (for uniform scaling in all dimensions) or numeric vector specifying the factor by which each dimension of the gate should be expanded (absolute value > 1) or contracted (absolute value < 1). Negative values will result in a reflection in that dimension.
An angle in degrees by which the gate should be rotated in the counter-clockwise direction.
A separate 2-dimensional center of rotation for the gate, if desired. By default, this will
be the center for
Either a numeric scalar or numeric vector. If it is scalar, this is just the desired shift of the gate in
its first dimension. If it is a vector, it specifies both
A numeric scalar specifying the desired shift of the gate in its second dimension.
A numeric vector specifying where the center or centroid should be moved (rather than specifiying
Assignments made to the slots of the particular Gate-type filter object in the form "<slot_name> = <value>"
This method allows changes to the four filter types defined by simple geometric gates (
equally simple geometric transformations (shifting/translation, scaling/dilation, and rotation). The method also
allows for directly re-setting the slots of each Gate-type object. Note that these methods are for manually altering
the geometric definition of a gate. To easily transform the definition of a gate with an accompanyging scale
transformation applied to its underlying data, see
transform_gate will apply any direct alterations to the slots of the supplied Gate-type filter object.
For example, if "
mean = c(1,3)" is present in the argument list when
transform_gate is called on a
ellipsoidGate object, the first change applied will be to shift the
mean slot to
(1,3). The method
will carry over the dimension names from the gate, so there is no need to provide column or row names with arguments
transform_gate then passes the geometric arguments (
center) to the methods which perform each respective type of transformation:
rotate_gate. The order of operations is to first
scale, then rotate, then shift. The default behavior of each operation follows that of its corresponding method but for
the most part these are what the user would expect. A few quick notes:
rotate_gate is not defined for
quadGate objects, due to their definition as
having 1-dimensional boundaries.
The default center for both rotation and scaling of a
polygonGate is the centroid of the polygon. This
results in the sort of scaling most users expect, with a uniform scale factor not distorting the shape of the original polygon.
filter object of the same type as
gate, with the geometric transformations applied
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## Not run: # Scale the original gate non-uniformly, rotate it 15 degrees, and shift it transformed_gate <- transform_gate(original_gate, scale = c(2,3), deg = 15, dx = 500, dy = -700) # Scale the original gate (in this case an ellipsoidGate) after moving its center to (1500, 2000) transformed_gate <- transform_gate(original_gate, scale = c(2,3), mean = c(1500, 2000)) ## End(Not run)
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