GDK

From 0a186150f085c34462b8c6cd5257849c73f80b65 Mon Sep 17 00:00:00 2001 From: scuri Date: Wed, 2 Dec 2009 20:30:55 +0000 Subject: New: driver SVG. --- html/en/drv/gdk.html | 113 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 113 insertions(+) create mode 100644 html/en/drv/gdk.html (limited to 'html/en/drv/gdk.html') diff --git a/html/en/drv/gdk.html b/html/en/drv/gdk.html new file mode 100644 index 0000000..df5aab2 --- /dev/null +++ b/html/en/drv/gdk.html @@ -0,0 +1,113 @@ + + + + + + +GDK + + + + + +

GDK Base Driver

+ +

This driver represents a basic driver for all system-dependent drivers + implemented in the X-Windows system. The implementation uses the + GDK and + Cairo API + functions. This driver was designed for the GTK+ version 2, and can be + compiled and used in Microsoft Windows system.

+ +

Behavior of Functions

Control

+ Play: does nothing, returns + CD_ERROR.

Coordinate System and Clipping

+ + UpdateYAxis: the + orientation of axis Y is the opposite to its orientation in the CD library.

Attributes

+ + LineWidth: if + width is 1, the driver will use 0 for a better + performance.
+ + LineStyle: thick lines have + style only in the line's direction. For example, you will see small rectangles + in a thick dotted line.
+ + NativeFont: also accepts the + X-Windows font string format. A scaled font is generated using the font size + and the font face.
+ Font: the old name "System" + is mapped to "fixed". A scaled font is generated using the font size + and the font face.

Colors

+ + Palette: When the number of + bits per pixel is smaller than or equal to 8, the driver will use the system + palette to solve colors passed as parameters to the canvas. The driver + allocates colors as they are requested - if a color cannot be allocated, the + closest color is used in the palette. For such, the driver sees all available + colors, in the current application and others. If one of the applications is + terminated, a color in the palette may become invalid and will only be updated + by the driver when it is requested again. For this reason, a call to + cdForeground or cdBackground or cdPalette + is recommended before drawing.
+ When CD_FORCE is used, the driver forces color allocation. + This may imply changing colors in other applications when a cursor moves in + and out of the canvas. However, if the number of requested colors is smaller + than the maximum number of possible colors in the palette, then the first + colors in the default system palette will be preserved, minimizing this + problem.
+ When CD_POLITE is used, all colors allocated by the driver are liberated, and + the requested colors are allocated. This is useful for the application to + prioritize the colors that will be allocated, causing other colors to be + mapped to their closest colors.
+ Note that canvases in the same application interfere with one another, but + when a canvas is terminated it liberates all allocated colors.

Exclusive Attributes

"GC": returns the GDK graphics + context (get only). In Lua is returned as a user data.

+ +

"ROTATE": allows the usage of 1 + angle and 1 coordinate (x, y), that define a global rotation transformation + centered in the specified coordinate. Use 1 real and 2 integer values inside a + string ("%g %d %d" = angle x y). In this driver will change the + current transformation matrix, if removed will reset the current + transformation matrix.

+ +

"ANTIALIAS": controls the use of + anti-aliasing for the text, image zoom and line drawing primitives. Assumes + values "1" (active) and "0" (inactive). Default value: "1".

+ +

"CAIROVERSION": returns a string with + the Cairo version number. It is empty if the Cairo is not available.

+ + + + -- cgit v1.2.3