| cairo-cairo-matrix-t {RGtk2} | R Documentation |
Generic matrix operations
cairoMatrixInit(xx, yx, xy, yy, x0, y0)
cairoMatrixInitIdentity()
cairoMatrixInitTranslate(tx, ty)
cairoMatrixInitScale(sx, sy)
cairoMatrixInitRotate(radians)
cairoMatrixTranslate(matrix, tx, ty)
cairoMatrixScale(matrix, sx, sy)
cairoMatrixRotate(matrix, radians)
cairoMatrixInvert(matrix)
cairoMatrixMultiply(result, a, b)
cairoMatrixTransformDistance(matrix, dx, dy)
cairoMatrixTransformPoint(matrix, x, y)
CairoMatrix is used throughout cairo to convert between different
coordinate spaces. A CairoMatrix holds an affine transformation,
such as a scale, rotation, shear, or a combination of these.
The transformation of a point (x,y)
is given by:
x_new = xx * x + xy * y + x0;
y_new = yx * x + yy * y + y0;
The current transformation matrix of a Cairo, represented as a
CairoMatrix, defines the transformation from user-space
coordinates to device-space coordinates. See cairoGetMatrix and
cairoSetMatrix.
CairoMatrixCairoMatrix holds an affine transformation, such as a scale,
rotation, shear, or a combination of those. The transformation of
a point (x, y) is given by:
x_new = xx * x + xy * y + x0;
y_new = yx * x + yy * y + y0;
xxyxxyyyx0y0
Derived by RGtkGen from GTK+ documentation
http://www.cairographics.org/manual/cairo-cairo-matrix-t.html