CD Metafile Driver (cdmf.h)

This driver allows the generation of a CD Metafile, a very simple format that includes calls to functions of the CD library and provides persistence to its primitives.

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Use

The file is created by calling function cdCreateCanvas(CD_METAFILE, Data). The Data parameter is a string that must contain the filename and the canvas dimensions, in the following format:

''filename [widthxheight resolution]'' or in C use "%s %gx%g %g"

Only the parameter filename is required. 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 "3.8". Width, height and resolution are real values.

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 - Be careful when saving images in the file, because it uses a text format to store all numbers and texts of primitives, including images, which significantly increases its size.

Extension - Although this is not required, we recommend the extension used for the file to be ".MF".

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Behavior of Functions

Coordinate System and Clipping

• cdGetCanvasSize: returns the size used in the call to function cdCreateCanvas.
• cdUpdateYAxis: does nothing.

Attributes

cdFontDim: uses a size estimator, returning approximate values.

cdTextSize: uses a size estimator, returning approximate values.

Colors

• cdGetColorPlanes: always returns 24.

Client Images

• cdGetImageRGB: does nothing.

Server Images

• All functions do nothing.

WC

• Implemented directly in the driver.