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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 @@ +<!doctype HTML PUBLIC "-//IETF//DTD HTML//EN"> +<html> + +<head> +<meta http-equiv="Content-Language" content="en-us"> +<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> +<title>GDK</title> +<link rel="stylesheet" type="text/css" href="../../style.css"> +</head> + +<body> + +<h2>GDK Base Driver</h2> + + <p>This driver represents a basic driver for all system-dependent drivers + implemented in the X-Windows system. The implementation uses the + <a href="http://library.gnome.org/devel/gdk/">GDK</a> and + <a href="http://library.gnome.org/devel/cairo/">Cairo</a> API + functions. This driver was designed for the GTK+ version 2, and can be + compiled and used in Microsoft Windows system.</p> + +<h3>Behavior of Functions</h3> +<h4>Control </h4> +<ul> + <li><a href="../func/other.html#cdPlay"> + <font face="Courier"><strong>Play</strong></font></a>: does nothing, returns + <font face="Courier">CD_ERROR</font>. </li> +</ul> +<h4>Coordinate System and Clipping </h4> +<ul> + <li> + <a href="../func/coordinates.html#cdUpdateYAxis"> + <font face="Courier"><strong>UpdateYAxis</strong></font></a>: the + orientation of axis Y is the opposite to its orientation in the CD library.</li> +</ul> +<h4>Attributes </h4> +<ul> + <li> + <a href="../func/lines.html#cdLineWidth"> + <font face="Courier"><strong>LineWidth</strong></font></a>: if + <font face="Courier">width</font> is 1, the driver will use 0 for a better + performance.</li> + <li> + <a href="../func/lines.html#cdLineStyle"> + <font face="Courier"><strong>LineStyle</strong></font></a>: thick lines have + style only in the line's direction. For example, you will see small rectangles + in a thick dotted line.</li> + <li> + <a href="../func/text.html#cdNativeFont"> + <font face="Courier"><strong>NativeFont</strong></font></a>: also accepts the + X-Windows font string format. A scaled font is generated using the font size + and the font face.</li> + <li><a href="../func/text.html#cdFont"> + <font face="Courier"><strong>Font</strong></font></a>: the old name "System" + is mapped to "fixed". A scaled font is generated using the font size + and the font face.</li> +</ul> +<h4>Colors </h4> +<ul> + <li> + <a href="../func/color.html#cdPalette"> + <font face="Courier"><strong>Palette</strong></font></a>: 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 <strong> + cdForeground </strong>or <strong>cdBackground</strong> or <strong>cdPalette</strong> + is recommended before drawing.<br> + 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.<br> + 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.<br> + Note that canvases in the same application interfere with one another, but + when a canvas is terminated it liberates all allocated colors.</li> +</ul> +<h4>Exclusive Attributes</h4> +<ul> + <li>"<b><font face="Courier">GC</font></b>": returns the GDK graphics + context (get only). In Lua is returned as a user data.</li> +</ul> + +<ul> + <li>"<b><font face="Courier">ROTATE</font></b>": 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.</li> +</ul> + +<ul> + <li>"<b><font face="Courier">ANTIALIAS</font></b>": 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".</li> +</ul> + +<ul> + <li><b><font face="Courier">"CAIROVERSION": </font></b>returns a string with + the Cairo version number. It is empty if the Cairo is not available.</li> +</ul> + +</body> + +</html> |