From 7b52cc13af4e85f1ca2deb6b6c77de9c95ea0dcf Mon Sep 17 00:00:00 2001 From: scuri Date: Fri, 17 Oct 2008 06:10:33 +0000 Subject: First commit - moving from LuaForge to SourceForge --- html/en/drv/dgn.html | 161 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 161 insertions(+) create mode 100644 html/en/drv/dgn.html (limited to 'html/en/drv/dgn.html') diff --git a/html/en/drv/dgn.html b/html/en/drv/dgn.html new file mode 100644 index 0000000..acd688b --- /dev/null +++ b/html/en/drv/dgn.html @@ -0,0 +1,161 @@ + + + + + + +CD_DGN + + + + + +

CD_DGN - MicroStation Design File Driver (cddgn.h)

+ +

This driver allows generating a MicroStation design file. The file name usually has an extension .DGN. The driver + supports only MicroStation version 4.0 or later. The format's copyrights are property of + Bentley Systems.

+ +

Use

+ +

The file is created and opened by calling function + cdCreateCanvas(CD_DGN, + Data), in which Data contains the filename and canvas dimensions. This function + opens the file and writes its header. Then, other functions in the CD library can be called as usual. The + Data parameter string has the following format:

+ + 
"filename [widthxheight] [resolution] [-f] [-sseedfile]"   or in C "%s %gx%g %g %s"
+ +

Only the parameter filename is required. The filename must be inside double quotes (") + if it has spaces. Width and height are provided in millimeters + (note the lowercase "x" between them), and their default value in pixels is INT_MAX for + both dimensions. Resolution is the number of pixels per millimeter; its default value is + "3.78 pixels/mm" (96 DPI). Width, height and + resolution are real values. Parameter -f modifies the polygon + filling's behavior. Just as in MicroStation, you can specify a seed file using parameter -s. + Width, height and resolution are + used only by + cdCanvasGetSize and in + pixel-millimeter conversion. 

+

Any amount of such canvases may exist simultaneously. It is important to note that a call to function + + cdKillCanvas is required to close the file properly.

+

Images and Colors - The DGN format does not support server images and works with an indexed-color format. + Color quality is limited to 256 colors, and the format uses a uniform palette to convert RGB colors into palette + indices. If you configure a palette, the color conversion process will become slower.

+

Filling - Up to version 5.0, MicroStation presents some limitations for polygon filling. You can disable + filling by means of string "-f" in the Data parameter. Filled + polygons can only have around 10,000 vertices; if the value is larger, the polygon style changes to closed lines.

+

Seed - In the seed file, several DGN parameters can be defined to be used in the drawing. The library offers + a default seed file, called "SEED2D.DGN". The file's location depends on the environment variable CDDIR.

+ +

Behavior of Functions

+

Control

+ +

Coordinate System and Clipping

+ +

Primitives

+ +

Attributes

+ +
+
+ + + + + + + + + + + + + + + + + + + + + + +
Font Mapping
CD FontsMicroStation Font Index
CD_SYSTEM0
CD_COURIER 1
CD_TIMES_ROMAN2
CD_HELVETICA3
+
+
+

Colors

+ +

Client Images

+ +

Server Images

+ + + + + -- cgit v1.2.3