# qvmap

From qtpaint v1.1.0
by Michael Lawrence

##### Mapping coordinates

Transforms X and Y coordinates with a Qt-style transformation matrix. The advantage over direct use of Qt is vectorization.

##### Usage

`qvmap(m, x, y)`

##### Arguments

- m
- A matrix encoding the transformation, or something
coercible to a matrix, like a C++
`QTransform`

instance - x
- X coordinates; if
`y`

is missing, should be something coercible to a numeric vector or matrix. If the vector coercion succeeds, the vector is coerced to a matrix with`matrix(x, ncol = 2, byrow = TRUE)`

. The first column is taken as X, the second as Y. - y
- Y coordinates, optional

##### Value

- The mapped coordinates, as a two column (X, Y) matrix,
unless
`y`

is missing, in which case an attempt is made to coerce the result to the class of`x`

, if any.

*Documentation reproduced from package qtpaint, version 1.1.0, License: GPL version 2 or later*

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