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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <mach.h>
include <gset.h>
define MAXPTS 20
task plot1, plot2, plot3, plot4, plot5, plot6, plot7, plot8,
balls, ticks, vdm
procedure plot1()
real v[5]
int i
int fd, open()
pointer gp, gopen()
begin
do i = 1, 5
v[i] = i ** 2
# iferr (call delete ("x_mc"))
# ;
# fd = open ("x_mc", NEW_FILE, BINARY_FILE)
fd = STDGRAPH
gp = gopen ("stdgraph", NEW_FILE, fd)
call gswind (gp, 1., 5., INDEF, INDEF)
call gascale (gp, v, 5, 2)
call glabax (gp, "Y = X ** 2", "X-AXIS", "Y-AXIS")
call gvline (gp, v, 5, 1., 5.)
call gclose (gp)
call close (fd)
end
procedure plot2()
int i
real x[512], y[512]
real xc, yc, xs, ys
int fd, open()
pointer gp, gopen()
begin
do i = 1, 512 {
x[i] = ((i - 256.0) / 16.)
if (abs(x[i]) < EPSILON)
y[i] = 1.0
else
y[i] = sin (x[i]) / x[i]
}
# iferr (call delete ("x_mc"))
# ;
# fd = open ("x_mc", NEW_FILE, BINARY_FILE)
fd = STDGRAPH
gp = gopen ("stdgraph", NEW_FILE, fd)
call gascale (gp, x, 512, 1)
call gascale (gp, y, 512, 2)
call glabax (gp, "The SINC Function", "X-AXIS", "Y-AXIS")
call gpline (gp, x, y, 512)
xc = 8
yc = .25
xs = 3.2
ys = 0.1
do i = 1, 10 {
call gmark (gp, xc, yc, GM_CIRCLE, -xs, -ys)
xc = xc + xs / 5
yc = yc + ys / 5
xs = xs * 1.25
ys = ys * 1.5
}
call gclose (gp)
call close (fd)
end
procedure plot3()
int i
real x[512], y[512]
int fd, open()
pointer gp, gopen()
begin
do i = 1, 512 {
x[i] = ((i - 256.0) / 8.)
if (abs(x[i]) < EPSILON)
y[i] = 1.0
else
y[i] = sin (x[i]) / x[i]
}
# iferr (call delete ("x_mc"))
# ;
# fd = open ("x_mc", NEW_FILE, BINARY_FILE)
fd = STDGRAPH
gp = gopen ("stdgraph", NEW_FILE, fd)
call gseti (gp, G_DRAWGRID, YES)
call gascale (gp, x, 512, 1)
call gascale (gp, y, 512, 2)
call glabax (gp, "The SINC Function", "X-AXIS", "Y-AXIS")
call gpline (gp, x, y, 512)
call gclose (gp)
call close (fd)
end
procedure plot4()
int i
real x[512], y[512]
int fd, open()
pointer gp, gopen()
begin
do i = 1, 512 {
x[i] = (i - 256.0) / 4.
if (abs(x[i]) < EPSILON)
y[i] = 2.0 * 1E4
else
y[i] = (sin (x[i]) / x[i] + 1.0) * 1E4
}
# iferr (call delete ("x_mc"))
# ;
# fd = open ("x_mc", NEW_FILE, BINARY_FILE)
fd = STDGRAPH
gp = gopen ("stdgraph", NEW_FILE, fd)
call gseti (gp, G_YTRAN, GW_LOG)
call gascale (gp, x, 512, 1)
call gascale (gp, y, 512, 2)
call glabax (gp, "Log of The SINC Function", "X-AXIS", "Y-AXIS")
call gpline (gp, x, y, 512)
call gclose (gp)
call close (fd)
end
procedure plot5()
int fd
int open(), clgeti()
real x1, x2, clgetr()
pointer gp, gopen()
begin
# iferr (call delete ("x_mc"))
# ;
# fd = open ("x_mc", NEW_FILE, BINARY_FILE)
fd = STDGRAPH
gp = gopen ("stdgraph", NEW_FILE, fd)
x1 = clgetr ("x1")
x2 = clgetr ("x2")
call gseti (gp, G_NMINOR, clgeti ("nminor"))
call gseti (gp, G_XTRAN, GW_LOG)
call gseti (gp, G_YTRAN, GW_LOG)
call gsetr (gp, G_MINORWIDTH, 1.0)
call gswind (gp, x1, x2, 0.001, 1000.0)
call glabax (gp, "Log Scaling", "X-AXIS", "Y-AXIS")
call gclose (gp)
call close (fd)
end
procedure plot6()
int i
long seed
real size, urand()
int fd, open(), clgeti()
pointer gp, gopen()
data seed /3/
begin
# iferr (call delete ("x_mc"))
# ;
# fd = open ("x_mc", NEW_FILE, BINARY_FILE)
fd = STDGRAPH
gp = gopen ("stdgraph", NEW_FILE, fd)
call gseti (gp, G_ASPECT, clgeti("aspect"))
call glabax (gp, "", "", "")
do i = 1, 300 {
size = real (nint (urand(seed) * 4 + .5))
call gmark (gp, urand(seed), urand(seed), GM_BOX, size, size)
}
call gclose (gp)
call close (fd)
end
procedure plot7()
int i
real x[8192], y[8192]
int fd, open()
pointer gp, gopen()
begin
do i = 1, 8192 {
x[i] = ((i - 4096.0) / 128.)
if (abs(x[i]) < EPSILON)
y[i] = 1.0
else
y[i] = sin (x[i]) / x[i]
y[i] = y[i] + cos ((i-1) * 0.392699) * .001
}
# iferr (call delete ("x_mc"))
# ;
# fd = open ("x_mc", NEW_FILE, BINARY_FILE)
fd = STDGRAPH
gp = gopen ("stdgraph", NEW_FILE, fd)
call gseti (gp, G_DRAWGRID, YES)
call gascale (gp, x, 8192, 1)
call gascale (gp, y, 8192, 2)
call glabax (gp, "The SINC Function", "X-AXIS", "Y-AXIS")
call gpline (gp, x, y, 8192)
call gclose (gp)
call close (fd)
end
procedure balls()
int i, j, m, npts, nsteps
long seed
real p[MAXPTS,2], d[MAXPTS,2]
real urand()
int fd, open(), clgeti()
pointer gp, gopen()
begin
npts = max(1, min(MAXPTS, clgeti ("npoints")))
nsteps = max (10, clgeti ("nsteps"))
# iferr (call delete ("x_mc"))
# ;
# fd = open ("x_mc", NEW_FILE, BINARY_FILE)
fd = STDGRAPH
gp = gopen ("stdgraph", NEW_FILE, fd)
# call glabax (gp, "Bouncing Balls", "", "")
# Set the initial conditions.
do i = 1, npts
do j = 1, 2 {
p[i,j] = urand (seed)
d[i,j] = max (0.01, urand (seed) * .1)
if (mod (i, 2) == 0)
d[i,j] = -d[i,j]
}
# Draw the trajectories.
do m = 1, nsteps
do i = 1, npts {
call gseti (gp, G_PMLTYPE, GL_CLEAR)
call gmark (gp, p[i,1], p[i,2], GM_DIAMOND, 4., 4.)
do j = 1, 2 {
p[i,j] = p[i,j] + d[i,j]
if (p[i,j] < 0) {
p[i,j] = -p[i,j]
d[i,j] = -d[i,j]
} else if (p[i,j] > 1) {
p[i,j] = 1 - (p[i,j] - 1)
d[i,j] = -d[i,j]
}
}
call gseti (gp, G_PMLTYPE, GL_SOLID)
call gmark (gp, p[i,1], p[i,2], GM_DIAMOND, 4., 4.)
call gflush (gp)
}
call gclose (gp)
call close (fd)
end
procedure ticks()
real x1, x2, p1, p2
int rough_nticks
int logflag
real tick1, step, linearity
bool clgetb()
int btoi(), clgeti()
real gt_linearity(), clgetr(), elogr()
begin
x1 = clgetr ("x1")
x2 = clgetr ("x2")
rough_nticks = clgeti ("nticks")
logflag = btoi (clgetb ("log"))
if (logflag == YES) {
p1 = elogr (x1)
p2 = elogr (x2)
} else {
p1 = x1
p2 = x2
}
linearity = gt_linearity (x1, x2)
call gtickr (p1, p2, rough_nticks, logflag, tick1, step)
call printf ("tick1=%g, step=%g, linearity=%g\n")
call pargr (tick1)
call pargr (step)
call pargr (linearity)
end
procedure plot8()
int i
real x[512], y[512]
int fd
pointer gp, gopen()
begin
do i = 1, 512 {
x[i] = ((i - 256.0) / 8.)
if (abs(x[i]) < EPSILON)
y[i] = 1.0
else
y[i] = sin (x[i]) / x[i]
}
fd = STDGRAPH
gp = gopen ("stdgraph", NEW_FILE, fd)
call gseti (gp, G_DRAWAXES, 1)
call gseti (gp, G_SETAXISPOS, YES)
call gsetr (gp, G_AXISPOS1, 0.0)
call gseti (gp, G_DRAWGRID, YES)
call gascale (gp, x, 512, 1)
call gascale (gp, y, 512, 2)
call glabax (gp, "", "", "")
call gpline (gp, x, y, 512)
call gtext (gp, -20., 0.80, "The Sinc Function", "hj=c,vj=b")
call gtext (gp, -20., 0.75, "y = sin(x) / x", "hj=c,vj=b")
call gclose (gp)
call close (fd)
end
# VDM -- Test output of a plot to the virtual device metafile.
procedure vdm()
real v[5]
int i
pointer gp, gopen()
begin
do i = 1, 5
v[i] = i ** 2
gp = gopen ("vdm", NEW_FILE, STDGRAPH)
call gswind (gp, 1., 5., INDEF, INDEF)
call gascale (gp, v, 5, 2)
call glabax (gp, "Y = X ** 2", "X-AXIS", "Y-AXIS")
call gvline (gp, v, 5, 1., 5.)
call gclose (gp)
end
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