Name
ccontext:UserToDeviceDistance -- user to device distance
Synopsis
dx, dy = ccontext:UserToDeviceDistance(ux, uy)
Function
Transform a distance vector from user space to device space. This function is similar to ccontext:UserToDevice() except that the translation components of the CTM will be ignored when transforming (dx, dy).

Inputs
ux
X component of a distance vector (user space)
uy
Y component of a distance vector (user space)
Results
dx
X component of a distance vector (device space)
dy
Y component of a distance vector (device space)
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