Programming and Graphics

322 Introduction to C++ Programming and Graphics

Matrix stack

pushmatrix () Save the current transformation matrix

on the matrix stack

popmatrix () Reinstate the last matrix pushed

Viewpoint

polarview (dist, azim, inc, twist) Specify the viewer’s position

in polar coordinates

up (x, y, z) Specify the world up

lookat (vx, vy, vz, px, py, pz, twist) Specify the viewer’s position

Arcs and circles

circleprecision (nsegs) Set number of line segments

around a circle; default is 32

arc (x, y, radius, startang, endang) Draw an arc in world units

sector (x, y, radius, startang, endang) Draw a sector interpreted

as a polygon

circle (x, y, radius) Draw a circle interpreted

as a polygon.

Curves

curvebasis (basis) Define a basis matrix for a curve

curveprecision (nsegs) Define the number of line segments to draw a curve

rcurve (geom) Draw a rational curve

curve (geom) Draw a curve

curven (n, geom) Draw n-3 overlapping curve segments;

nmustbeatleast4

Transformations

translate (x, y, z) Set up a translation

scale (x, y, z) Set up scaling factors for x, y, and z axes

rotate (angle, axis) Set up a rotation for axis, where axis is x, y, or z

Flushing

vsetflush (yesno) Set global flushing status

vflush () Call device flush or synchronization routine