Like with-graphics-translation except that the translation is done after applying all existing transforms.
graphics-ports
with-graphics-post-translation (port dx dy) &body body => result
port⇩ |
A graphics port. |
dx⇩ |
A real number. |
dy⇩ |
A real number. |
body⇩ |
Lisp forms. |
result |
The value returned by the last form of body. |
The macro with-graphics-post-translation
is the same as with-graphics-translation, but the translation of (dx, dy) is done after applying all existing transforms. That means that the translation is "absolute", not transformed. In contrast, when using with-graphics-translation the translation is transformed by any existing transform(s).
The forms in body are evaluated as an implicit progn with the new transform bound to port.
This form draws a 40x40 rectangle at (100,100), because the scale is applied to the coordinates of the rectangle, but not to the translation.
(gp:with-graphics-scale (port 2 2) (gp:with-graphics-post-translation (port 100 100) (gp:draw-rectangle port 0 0 20 20)))
Compare with this form, using with-graphics-translation instead, which draws a 40x40 rectangle at (200,200), because the scale applies to the translation too:
(gp:with-graphics-scale (port 2 2) (gp:with-graphics-translation (port 100 100) (gp:draw-rectangle port 0 0 20 20)))
with-graphics-transform-reset
with-graphics-translation
13.3.1 Setting the graphics state
CAPI User Guide and Reference Manual (Unix version) - 01 Dec 2021 19:33:02