Programming and Graphics

B Summary ofVogleFunctions 319

Axes and projections

The projection routines define a new transformation matrix and consequently new
world units. Parallel projections are defined by the functionsorthoandortho2.
Perspective projections are defined by the functionsperspectiveandwindow.

ortho (left, right, bottom, top, near, far) Define x, y, and z clipping planes

ortho2 (left, right, bottom, top) Define x and y clipping planes

perspective (fov, aspect, near, far) Specify perspective

for field of view (fov), aspect

ratio (aspect), and distance

from the eye to the near and far

clipping planes

window (left, right, bot, top, near, far) Viewing pyramid

clipping (onoff) Turn clipping on or off;

setonoffto0toturnoff

Text

font (fontname) Set the current font

int numchars() Return number of characters

in the current SOFTWARE font

textsize (width, height) Set maximum size of a character

in the current SOFTWARE font

Negative size gives backward characters

textang (ang) Set the SOFTWARE text angle

fixedwidth (onoff) Turn fixed-width mode on or off

for a SOFTWARE font

centertext (onoff) Turns center-text mode on or off

for SOFTWARE a font

getcharsize (c, width, height) Get the width and height of a character

getfontsize (width, height) Get maximum width and height

of a character

drawchar (c) Draw the character c

and update the current position

drawstr (str) Drawthetextinstring

at the current position

float strlength (str) Return the length of the stringsrt

boxtext (x, y, l, h, str) Draw the SOFTWARE stringstr

so that it fits in the imaginary box

boxfit (l, h, nchars) Set scale for text so that a string

of the biggest characters in the

SOFTWARE font will fit inside anl×hbox,

wherelandhare real values