Name: PGFUNT Purpose: function defined by X = F(T), Y = G(T) Category: GRAPHICS File: pgplot.src Author: T.J. Pearson Use: see description below. Description: SUBROUTINE PGFUNT (FX, FY, N, TMIN, TMAX, PGFLAG) REAL FX, FY EXTERNAL FX, FY INTEGER N REAL TMIN, TMAX INTEGER PGFLAG Draw a curve defined by parametric equations X = FX(T), Y = FY(T). Arguments: FX (external real function): supplied by the user, evaluates X-coordinate. FY (external real function): supplied by the user, evaluates Y-coordinate. N (input) : the number of points required to define the curve. The functions FX and FY will each be called N+1 times. TMIN (input) : the minimum value for the parameter T. TMAX (input) : the maximum value for the parameter T. PGFLAG (input) : if PGFLAG = 1, the curve is plotted in the current window and viewport; if PGFLAG = 0, PGENV is called automatically by PGFUNT to start a new plot with automatic scaling. Note: The functions FX and FY must be declared EXTERNAL in the Fortran program unit that calls PGFUNT. Note: This subroutine is only callable from Fortran, not from C. Updates: Oct 16, 1998: JPT automatically extracted from source.