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get-transformation, etc. methods on dc<%>

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original commit: 06a47a3c54fb04ad598372303ff36b779f994e9c
This commit is contained in:
Matthew Flatt 2010-08-02 08:25:47 -06:00
parent 48367ad6a2
commit 6e114baa67
2 changed files with 25 additions and 9 deletions
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3
collects/scribblings/gui/blurbs.rkt
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@ -152,8 +152,7 @@ information@|details|, even if the editor currently has delayed refreshing (see
(define SeeMzParam @elem{(see @secref[#:doc reference-doc "parameters"])}) (define SeeMzParam @elem{(see @secref[#:doc reference-doc "parameters"])})
(define DrawSizeNote @elem{Restrictions on the magnitude of (define DrawSizeNote "")
drawing coordinates are described with @scheme[dc<%>].})
(define LineNumbering @elem{Lines are numbered starting with @scheme[0].}) (define LineNumbering @elem{Lines are numbered starting with @scheme[0].})
(define ParagraphNumbering @elem{Paragraphs are numbered starting with @scheme[0].}) (define ParagraphNumbering @elem{Paragraphs are numbered starting with @scheme[0].})

31
doc/release-notes/racket/Draw_and_GUI_5_5.txt
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@ -29,23 +29,40 @@ Changes to the drawing toolbox:
* A `dc<%>' supports additional drawing transformations: a rotation * A `dc<%>' supports additional drawing transformations: a rotation
(via `set-rotation') and a general transformation matrix (via (via `set-rotation') and a general transformation matrix (via
`set-initial-matrix'). `set-initial-matrix'). Scaling factors can be negative, which
corresponds to flipping the direction of drawing.
A transformation matrix has the form `(vector xx xy yx yy x0 y0)', A transformation matrix has the form `(vector xx xy yx yy x0 y0)',
where a point (x1, y1) is transformed to a point (x2, y2) with where a point (x1, y1) is transformed to a point (x2, y2) with x2 =
x2 = xx*x1 + yx*y1 + x0 and y2 = xy*x1 + yy*y1 + y0. xx*x1 + yx*y1 + x0 and y2 = xy*x1 + yy*y1 + y0, which is the usual
convention.
New methods `translate', `scale', `rotate', and `transform'
simplify adding a further translation, scaling, rotation, or
arbitrary matrix transformation on top of the current
transformation. The new `get-translation' and `set-translation'
methods help to capture and restore transformation settings.
The old translation and scaling transformations apply after the The old translation and scaling transformations apply after the
initial matrix. The new rotation transformation applies after the initial matrix. The new rotation transformation applies after the
other transformations. This layering is a little redundant, since other transformations. This layering is redundant, since all
all transformations could be expressed in a single matrix, but it transformations can be expressed in a single matrix, but it is
is backward compatibile. backward-compatibile. Methods like `get-translation',
`set-translation', `scale', etc. help hide the reundancy.
The alpha value of a `dc<%>' (as set by `set-alpha') is used for
all drawing operations, including drawing a bitmap.
The `draw-bitmap' and `draw-bitmap-section' methods now smooth
bitmaps while scaling, so the `draw-bitmap-section-smooth' method
of `bitmap-dc%' simply calls `draw-bitmap-section'.
* A `region%' can be created as independent of any `dc<%>', in which * A `region%' can be created as independent of any `dc<%>', in which
cases it uses the drawing context's current transformation at the cases it uses the drawing context's current transformation at the
time that it is installed as a clipping region. time that it is installed as a clipping region.
* The old 'xor mode for pens and brushes is no longer available. * The old 'xor mode for pens and brushes is no longer available
(since it is not supported by Cairo).
Changes to the GUI toolbox: Changes to the GUI toolbox: