The main axis onto which the
Focusis transformed in order to perform the perspective projection, z by default.It will normally not matter which axis is used, but it might be advantageous to use a particular axis in some special situations.
The
Transform, which will be applied to theShapeson thePicture, when the latter is output. The effect of this is equivalent to transforming theFocus, so that it lies on a major axis.Focus f(5, 5, -10, 2, 4, 10, 10, 180); ⇒f.transform== 0.989 -0.00733 -0.148 0 0 0.999 -0.0494 0 0.148 0.0488 0.988 0 -3.4 -4.47 0.865 1