Volume 7A: XView Programming Manual

The family FONT_FAMILY_DEFAULT is the default font for XView. The FONT_FAM-

ILY_DEFAULT_ FIXEDWIDTH

font is the default fixed-width font.

All the characters in fixed-width fonts occupy the same amount of space. Other fonts are

proportionally spaced; that is, each character may occupy a different amount of space.

The available styles are:

• FONT_STYLE_DEFAULT

• FONT_STYLE_NORMAL

• FONT_STYLE_BOLD

• FONT_STYLE_ITALIC

• FONT_STYLE_OBLIQUE

• FONT_STYLE_BOLD_ITALIC

• FONT_STYLE_BOLD_OBLIQUE

The default style indicates the default font’s type for XView.

The call to xv_find() in simple_font.c could have been written to specify the family and

style of the font rather than the name of the font:

font = (Xv_Font)xv_find(frame, FONT,

FONT_FAMILY, FONT_FAMILY_LUCIDA,

FONT_STYLE, FONT_STYLE_NORMAL,

NULL);

Since normal is the default style of the font, this example renders the same font as in the ear-

lier example. However, we could specify a different style:

font = (Xv_Font)xv_find(frame, FONT,

FONT_FAMILY, FONT_FAMILY_LUCIDA,

FONT_STYLE, FONT_STYLE_BOLD,

NULL);

This call returns a bold style of the lucidasans font. For most font families, you can specify a

font family with any style, although some families may not support an italic or bold style of

the font. Therefore, you should be prepared to handle a

NULL return from the call to

xv_create() or xv_find():

if (!(font = (Xv_Font)xv_find(canvas, FONT,

FONT_FAMILY, FONT_FAMILY_COUR,

FONT_STYLE, FONT_STYLE_ITALIC,

NULL))) {

/* Handle the case where the font fails. */

font = (