static void polar( void )
//polar contour plot example.
{
int i, j;
PLcGrid2 cgrid2;
PLFLT **z;
PLFLT px[PERIMETERPTS], py[PERIMETERPTS];
PLFLT t, r, theta;
PLFLT lev[10];
plenv( -1., 1., -1., 1., 0, -2 );
plcol0( 1 );
//Perimeter
for ( i = 0; i < PERIMETERPTS; i++ )
{
t = ( 2. * M_PI / ( PERIMETERPTS - 1 ) ) * (double) i;
px[i] = cos( t );
py[i] = sin( t );
}
plline( PERIMETERPTS, px, py );
//create data to be contoured.
plAlloc2dGrid( &cgrid2.xg, RPTS, THETAPTS );
plAlloc2dGrid( &cgrid2.yg, RPTS, THETAPTS );
plAlloc2dGrid( &z, RPTS, THETAPTS );
cgrid2.nx = RPTS;
cgrid2.ny = THETAPTS;
for ( i = 0; i < RPTS; i++ )
{
r = i / (double) ( RPTS - 1 );
for ( j = 0; j < THETAPTS; j++ )
{
theta = ( 2. * M_PI / (double) ( THETAPTS - 1 ) ) * (double) j;
cgrid2.xg[i][j] = r * cos( theta );
cgrid2.yg[i][j] = r * sin( theta );
z[i][j] = r;
}
}
for ( i = 0; i < 10; i++ )
{
lev[i] = 0.05 + 0.10 * (double) i;
}
plcol0( 2 );
plcont( (const PLFLT * const *) z, RPTS, THETAPTS, 1, RPTS, 1, THETAPTS, lev, 10,
pltr2, (void *) &cgrid2 );
plcol0( 1 );
pllab( "", "", "Polar Contour Plot" );
plFree2dGrid( z, RPTS, THETAPTS );
plFree2dGrid( cgrid2.xg, RPTS, THETAPTS );
plFree2dGrid( cgrid2.yg, RPTS, THETAPTS );
}
void
PLSHADES7(PLFLT *z, PLINT *nx, PLINT *ny, char *defined,
PLFLT *xmin, PLFLT *xmax, PLFLT *ymin, PLFLT *ymax,
PLFLT *clevel, PLINT *nlevel, PLINT *fill_width,
PLINT *cont_color, PLINT *cont_width, PLFLT *ftr, PLINT *lx)
{
PLINT rect = 1;
PLFLT ** a;
int i,j;
/* Create a vectored a array from transpose of the fortran z array. */
plAlloc2dGrid(&a, *nx, *ny);
for (i = 0; i < *nx; i++) {
for (j = 0; j < *ny; j++) {
a[i][j] = z[i +j * *lx];
}
}
c_plshades( a, *nx, *ny, NULL,
*xmin, *xmax, *ymin, *ymax,
clevel, *nlevel, *fill_width,
*cont_color, *cont_width,
c_plfill, rect, pltr, (void *) ftr);
/* Clean up memory allocated for a */
plFree2dGrid(a, *nx, *ny);
}
void
PLSHADE07(PLFLT *z, PLINT *nx, PLINT *ny, char *defined,
PLFLT *xmin, PLFLT *xmax, PLFLT *ymin, PLFLT *ymax,
PLFLT *shade_min, PLFLT *shade_max,
PLINT *sh_cmap, PLFLT *sh_color, PLINT *sh_width,
PLINT *min_color, PLINT *min_width,
PLINT *max_color, PLINT *max_width, PLINT *lx)
{
PLINT rect = 1;
PLFLT ** a;
int i,j;
/* Create a vectored a array from transpose of the fortran z array. */
plAlloc2dGrid(&a, *nx, *ny);
for (i = 0; i < *nx; i++) {
for (j = 0; j < *ny; j++) {
a[i][j] = z[i +j * *lx];
}
}
c_plshade( a, *nx, *ny, NULL,
*xmin, *xmax, *ymin, *ymax,
*shade_min, *shade_max,
*sh_cmap, *sh_color, *sh_width,
*min_color, *min_width, *max_color, *max_width,
c_plfill, rect, NULL, NULL);
/* Clean up memory allocated for a */
plFree2dGrid(a, *nx, *ny);
}
void
PLSHADE27(PLFLT *z, PLINT *nx, PLINT *ny, char *defined,
PLFLT *xmin, PLFLT *xmax, PLFLT *ymin, PLFLT *ymax,
PLFLT *shade_min, PLFLT *shade_max,
PLINT *sh_cmap, PLFLT *sh_color, PLINT *sh_width,
PLINT *min_color, PLINT *min_width,
PLINT *max_color, PLINT *max_width,
PLFLT *xg2, PLFLT *yg2, PLINT *lx)
{
PLINT rect = 0;
PLFLT **a;
int i,j;
PLcGrid2 cgrid2;
/* Create a vectored a array from transpose of the fortran z array. */
plAlloc2dGrid(&a, *nx, *ny);
plAlloc2dGrid(&cgrid2.xg, *nx, *ny);
plAlloc2dGrid(&cgrid2.yg, *nx, *ny);
cgrid2.nx = *nx;
cgrid2.ny = *ny;
for (i = 0; i < *nx; i++) {
for (j = 0; j < *ny; j++) {
a[i][j] = z[i +j * *lx];
cgrid2.xg[i][j] = xg2[i +j * *lx];
cgrid2.yg[i][j] = yg2[i +j * *lx];
}
}
c_plshade( a, *nx, *ny, NULL,
*xmin, *xmax, *ymin, *ymax,
*shade_min, *shade_max,
*sh_cmap, *sh_color, *sh_width,
*min_color, *min_width, *max_color, *max_width,
c_plfill, rect, pltr2, (void *) &cgrid2);
/* Clean up memory allocated for a */
plFree2dGrid(a, *nx, *ny);
plFree2dGrid(cgrid2.xg, *nx, *ny);
plFree2dGrid(cgrid2.yg, *nx, *ny);
}
void
plot5(void)
{
int i, j;
PLFLT xx, yy;
PLFLT **z, **w;
static PLINT mark = 1500, space = 1500;
/* Set up function arrays */
plAlloc2dGrid(&z, XPTS, YPTS);
plAlloc2dGrid(&w, XPTS, YPTS);
for (i = 0; i < XPTS; i++) {
xx = (double) (i - (XPTS / 2)) / (double) (XPTS / 2);
for (j = 0; j < YPTS; j++) {
yy = (double) (j - (YPTS / 2)) / (double) (YPTS / 2) - 1.0;
z[i][j] = xx * xx - yy * yy;
w[i][j] = 2 * xx * yy;
}
}
plenv(-1.0, 1.0, -1.0, 1.0, 0, 0);
plcol0(2);
plcont(z, XPTS, YPTS, 1, XPTS, 1, YPTS, clevel, 11, mypltr, NULL);
plstyl(1, &mark, &space);
plcol0(3);
plcont(w, XPTS, YPTS, 1, XPTS, 1, YPTS, clevel, 11, mypltr, NULL);
plcol0(1);
pllab("X Coordinate", "Y Coordinate", "Streamlines of flow");
plflush();
/* Clean up */
plFree2dGrid(z, XPTS, YPTS);
plFree2dGrid(w, XPTS, YPTS);
}
int
main( int argc, const char *argv[] )
{
int i, j;
PLFLT xx, yy, argx, argy, distort;
static PLINT mark = 1500, space = 1500;
PLFLT **z, **w;
PLFLT xg1[XPTS], yg1[YPTS];
PLcGrid cgrid1;
PLcGrid2 cgrid2;
// Parse and process command line arguments
(void) plparseopts( &argc, argv, PL_PARSE_FULL );
// Initialize plplot
plinit();
// Set up function arrays
plAlloc2dGrid( &z, XPTS, YPTS );
plAlloc2dGrid( &w, XPTS, YPTS );
for ( i = 0; i < XPTS; i++ )
{
xx = (double) ( i - ( XPTS / 2 ) ) / (double) ( XPTS / 2 );
for ( j = 0; j < YPTS; j++ )
{
yy = (double) ( j - ( YPTS / 2 ) ) / (double) ( YPTS / 2 ) - 1.0;
z[i][j] = xx * xx - yy * yy;
w[i][j] = 2 * xx * yy;
}
}
// Set up grids
cgrid1.xg = xg1;
cgrid1.yg = yg1;
cgrid1.nx = XPTS;
cgrid1.ny = YPTS;
plAlloc2dGrid( &cgrid2.xg, XPTS, YPTS );
plAlloc2dGrid( &cgrid2.yg, XPTS, YPTS );
cgrid2.nx = XPTS;
cgrid2.ny = YPTS;
for ( i = 0; i < XPTS; i++ )
{
for ( j = 0; j < YPTS; j++ )
{
mypltr( (PLFLT) i, (PLFLT) j, &xx, &yy, NULL );
argx = xx * M_PI / 2;
argy = yy * M_PI / 2;
distort = 0.4;
cgrid1.xg[i] = xx + distort * cos( argx );
cgrid1.yg[j] = yy - distort * cos( argy );
cgrid2.xg[i][j] = xx + distort * cos( argx ) * cos( argy );
cgrid2.yg[i][j] = yy - distort * cos( argx ) * cos( argy );
}
}
// Plot using identity transform
//
// plenv(-1.0, 1.0, -1.0, 1.0, 0, 0);
// plcol0(2);
// plcont(z, XPTS, YPTS, 1, XPTS, 1, YPTS, clevel, 11, mypltr, NULL);
// plstyl(1, &mark, &space);
// plcol0(3);
// plcont(w, XPTS, YPTS, 1, XPTS, 1, YPTS, clevel, 11, mypltr, NULL);
// plstyl(0, &mark, &space);
// plcol0(1);
// pllab("X Coordinate", "Y Coordinate", "Streamlines of flow");
//
pl_setcontlabelformat( 4, 3 );
pl_setcontlabelparam( 0.006, 0.3, 0.1, 1 );
plenv( -1.0, 1.0, -1.0, 1.0, 0, 0 );
plcol0( 2 );
plcont( (const PLFLT * const *) z, XPTS, YPTS, 1, XPTS, 1, YPTS, clevel, 11, mypltr, NULL );
plstyl( 1, &mark, &space );
plcol0( 3 );
plcont( (const PLFLT * const *) w, XPTS, YPTS, 1, XPTS, 1, YPTS, clevel, 11, mypltr, NULL );
plstyl( 0, &mark, &space );
plcol0( 1 );
pllab( "X Coordinate", "Y Coordinate", "Streamlines of flow" );
pl_setcontlabelparam( 0.006, 0.3, 0.1, 0 );
// Plot using 1d coordinate transform
plenv( -1.0, 1.0, -1.0, 1.0, 0, 0 );
plcol0( 2 );
plcont( (const PLFLT * const *) z, XPTS, YPTS, 1, XPTS, 1, YPTS, clevel, 11,
pltr1, (void *) &cgrid1 );
plstyl( 1, &mark, &space );
plcol0( 3 );
plcont( (const PLFLT * const *) w, XPTS, YPTS, 1, XPTS, 1, YPTS, clevel, 11,
pltr1, (void *) &cgrid1 );
plstyl( 0, &mark, &space );
plcol0( 1 );
pllab( "X Coordinate", "Y Coordinate", "Streamlines of flow" );
//
// pl_setcontlabelparam(0.006, 0.3, 0.1, 1);
// plenv(-1.0, 1.0, -1.0, 1.0, 0, 0);
// plcol0(2);
// plcont((const PLFLT **) z, XPTS, YPTS, 1, XPTS, 1, YPTS, clevel, 11,
// pltr1, (void *) &cgrid1);
//
// plstyl(1, &mark, &space);
// plcol0(3);
// plcont((const PLFLT **) w, XPTS, YPTS, 1, XPTS, 1, YPTS, clevel, 11,
// pltr1, (void *) &cgrid1);
// plstyl(0, &mark, &space);
// plcol0(1);
// pllab("X Coordinate", "Y Coordinate", "Streamlines of flow");
// pl_setcontlabelparam(0.006, 0.3, 0.1, 0);
//
// Plot using 2d coordinate transform
plenv( -1.0, 1.0, -1.0, 1.0, 0, 0 );
plcol0( 2 );
plcont( (const PLFLT * const *) z, XPTS, YPTS, 1, XPTS, 1, YPTS, clevel, 11,
pltr2, (void *) &cgrid2 );
plstyl( 1, &mark, &space );
plcol0( 3 );
plcont( (const PLFLT * const *) w, XPTS, YPTS, 1, XPTS, 1, YPTS, clevel, 11,
pltr2, (void *) &cgrid2 );
plstyl( 0, &mark, &space );
plcol0( 1 );
pllab( "X Coordinate", "Y Coordinate", "Streamlines of flow" );
//
// pl_setcontlabelparam(0.006, 0.3, 0.1, 1);
// plenv(-1.0, 1.0, -1.0, 1.0, 0, 0);
// plcol0(2);
// plcont((const PLFLT **) z, XPTS, YPTS, 1, XPTS, 1, YPTS, clevel, 11,
// pltr2, (void *) &cgrid2);
//
// plstyl(1, &mark, &space);
// plcol0(3);
// plcont((const PLFLT **) w, XPTS, YPTS, 1, XPTS, 1, YPTS, clevel, 11,
// pltr2, (void *) &cgrid2);
// plstyl(0, &mark, &space);
// plcol0(1);
// pllab("X Coordinate", "Y Coordinate", "Streamlines of flow");
//
pl_setcontlabelparam( 0.006, 0.3, 0.1, 0 );
polar();
//
// pl_setcontlabelparam(0.006, 0.3, 0.1, 1);
// polar();
//
pl_setcontlabelparam( 0.006, 0.3, 0.1, 0 );
potential();
//
// pl_setcontlabelparam(0.006, 0.3, 0.1, 1);
// potential();
//
// Clean up
plFree2dGrid( z, XPTS, YPTS );
plFree2dGrid( w, XPTS, YPTS );
plFree2dGrid( cgrid2.xg, XPTS, YPTS );
plFree2dGrid( cgrid2.yg, XPTS, YPTS );
plend();
exit( 0 );
}
static void potential( void )
//shielded potential contour plot example.
{
int i, j;
PLcGrid2 cgrid2;
PLFLT rmax, xmin, xmax, x0, ymin, ymax, y0, zmin, zmax;
PLFLT peps, xpmin, xpmax, ypmin, ypmax;
PLFLT eps, q1, d1, q1i, d1i, q2, d2, q2i, d2i;
PLFLT div1, div1i, div2, div2i;
PLFLT **z;
PLINT nlevelneg, nlevelpos;
PLFLT dz, clevel2, clevelneg[PNLEVEL], clevelpos[PNLEVEL];
PLINT ncollin, ncolbox, ncollab;
PLFLT px[PPERIMETERPTS], py[PPERIMETERPTS];
PLFLT t, r, theta;
//create data to be contoured.
plAlloc2dGrid( &cgrid2.xg, PRPTS, PTHETAPTS );
plAlloc2dGrid( &cgrid2.yg, PRPTS, PTHETAPTS );
plAlloc2dGrid( &z, PRPTS, PTHETAPTS );
cgrid2.nx = PRPTS;
cgrid2.ny = PTHETAPTS;
for ( i = 0; i < PRPTS; i++ )
{
r = 0.5 + (double) i;
for ( j = 0; j < PTHETAPTS; j++ )
{
theta = ( 2. * M_PI / (double) ( PTHETAPTS - 1 ) ) * ( 0.5 + (double) j );
cgrid2.xg[i][j] = r * cos( theta );
cgrid2.yg[i][j] = r * sin( theta );
}
}
rmax = r;
f2mnmx( cgrid2.xg, PRPTS, PTHETAPTS, &xmin, &xmax );
f2mnmx( cgrid2.yg, PRPTS, PTHETAPTS, &ymin, &ymax );
x0 = ( xmin + xmax ) / 2.;
y0 = ( ymin + ymax ) / 2.;
// Expanded limits
peps = 0.05;
xpmin = xmin - fabs( xmin ) * peps;
xpmax = xmax + fabs( xmax ) * peps;
ypmin = ymin - fabs( ymin ) * peps;
ypmax = ymax + fabs( ymax ) * peps;
// Potential inside a conducting cylinder (or sphere) by method of images.
// Charge 1 is placed at (d1, d1), with image charge at (d2, d2).
// Charge 2 is placed at (d1, -d1), with image charge at (d2, -d2).
// Also put in smoothing term at small distances.
//
eps = 2.;
q1 = 1.;
d1 = rmax / 4.;
q1i = -q1 * rmax / d1;
d1i = pow( rmax, 2. ) / d1;
q2 = -1.;
d2 = rmax / 4.;
q2i = -q2 * rmax / d2;
d2i = pow( rmax, 2. ) / d2;
for ( i = 0; i < PRPTS; i++ )
{
for ( j = 0; j < PTHETAPTS; j++ )
{
div1 = sqrt( pow( cgrid2.xg[i][j] - d1, 2. ) + pow( cgrid2.yg[i][j] - d1, 2. ) + pow( eps, 2. ) );
div1i = sqrt( pow( cgrid2.xg[i][j] - d1i, 2. ) + pow( cgrid2.yg[i][j] - d1i, 2. ) + pow( eps, 2. ) );
div2 = sqrt( pow( cgrid2.xg[i][j] - d2, 2. ) + pow( cgrid2.yg[i][j] + d2, 2. ) + pow( eps, 2. ) );
div2i = sqrt( pow( cgrid2.xg[i][j] - d2i, 2. ) + pow( cgrid2.yg[i][j] + d2i, 2. ) + pow( eps, 2. ) );
z[i][j] = q1 / div1 + q1i / div1i + q2 / div2 + q2i / div2i;
}
}
f2mnmx( z, PRPTS, PTHETAPTS, &zmin, &zmax );
// printf("%.15g %.15g %.15g %.15g %.15g %.15g %.15g %.15g \n",
// q1, d1, q1i, d1i, q2, d2, q2i, d2i);
// printf("%.15g %.15g %.15g %.15g %.15g %.15g \n",
// xmin, xmax, ymin, ymax, zmin, zmax);
// Positive and negative contour levels.
dz = ( zmax - zmin ) / (double) PNLEVEL;
nlevelneg = 0;
nlevelpos = 0;
for ( i = 0; i < PNLEVEL; i++ )
{
clevel2 = zmin + ( (double) i + 0.5 ) * dz;
if ( clevel2 <= 0. )
clevelneg[nlevelneg++] = clevel2;
else
clevelpos[nlevelpos++] = clevel2;
}
// Colours!
ncollin = 11;
ncolbox = 1;
ncollab = 2;
// Finally start plotting this page!
pladv( 0 );
plcol0( ncolbox );
plvpas( 0.1, 0.9, 0.1, 0.9, 1.0 );
plwind( xpmin, xpmax, ypmin, ypmax );
plbox( "", 0., 0, "", 0., 0 );
plcol0( ncollin );
if ( nlevelneg > 0 )
{
// Negative contours
pllsty( 2 );
plcont( (const PLFLT * const *) z, PRPTS, PTHETAPTS, 1, PRPTS, 1, PTHETAPTS,
clevelneg, nlevelneg, pltr2, (void *) &cgrid2 );
}
if ( nlevelpos > 0 )
{
// Positive contours
pllsty( 1 );
plcont( (const PLFLT * const *) z, PRPTS, PTHETAPTS, 1, PRPTS, 1, PTHETAPTS,
clevelpos, nlevelpos, pltr2, (void *) &cgrid2 );
}
// Draw outer boundary
for ( i = 0; i < PPERIMETERPTS; i++ )
{
t = ( 2. * M_PI / ( PPERIMETERPTS - 1 ) ) * (double) i;
px[i] = x0 + rmax * cos( t );
py[i] = y0 + rmax * sin( t );
}
plcol0( ncolbox );
plline( PPERIMETERPTS, px, py );
plcol0( ncollab );
pllab( "", "", "Shielded potential of charges in a conducting sphere" );
plFree2dGrid( z, PRPTS, PTHETAPTS );
plFree2dGrid( cgrid2.xg, PRPTS, PTHETAPTS );
plFree2dGrid( cgrid2.yg, PRPTS, PTHETAPTS );
}
void WINAPI
win_plFree2dGrid(PLFLT **f, PLINT nx, PLINT ny) {
plFree2dGrid(f, nx, ny);
}
int
main( int argc, const char *argv[] )
{
int i, j, k;
PLFLT *x, *y, **z, *z_row_major, *z_col_major;
PLFLT dx = 2. / (PLFLT) ( XPTS - 1 );
PLFLT dy = 2. / (PLFLT) ( YPTS - 1 );
PLfGrid2 grid_c, grid_row_major, grid_col_major;
PLFLT xx, yy, r;
PLINT ifshade;
PLFLT zmin, zmax, step;
PLFLT clevel[LEVELS];
PLINT nlevel = LEVELS;
PLINT indexxmin = 0;
PLINT indexxmax = XPTS;
PLINT *indexymin;
PLINT *indexymax;
PLFLT **zlimited;
// parameters of ellipse (in x, y index coordinates) that limits the data.
// x0, y0 correspond to the exact floating point centre of the index
// range.
PLFLT x0 = 0.5 * (PLFLT) ( XPTS - 1 );
PLFLT a = 0.9 * x0;
PLFLT y0 = 0.5 * (PLFLT) ( YPTS - 1 );
PLFLT b = 0.7 * y0;
PLFLT square_root;
// Parse and process command line arguments
plMergeOpts( options, "x08c options", NULL );
(void) plparseopts( &argc, argv, PL_PARSE_FULL );
// Initialize plplot
plinit();
// Allocate data structures
x = (PLFLT *) calloc( XPTS, sizeof ( PLFLT ) );
y = (PLFLT *) calloc( YPTS, sizeof ( PLFLT ) );
plAlloc2dGrid( &z, XPTS, YPTS );
z_row_major = (PLFLT *) malloc( XPTS * YPTS * sizeof ( PLFLT ) );
z_col_major = (PLFLT *) malloc( XPTS * YPTS * sizeof ( PLFLT ) );
if ( !z_row_major || !z_col_major )
plexit( "Memory allocation error" );
grid_c.f = z;
grid_row_major.f = (PLFLT **) z_row_major;
grid_col_major.f = (PLFLT **) z_col_major;
grid_c.nx = grid_row_major.nx = grid_col_major.nx = XPTS;
grid_c.ny = grid_row_major.ny = grid_col_major.ny = YPTS;
for ( i = 0; i < XPTS; i++ )
{
x[i] = -1. + (PLFLT) i * dx;
if ( rosen )
x[i] *= 1.5;
}
for ( j = 0; j < YPTS; j++ )
{
y[j] = -1. + (PLFLT) j * dy;
if ( rosen )
y[j] += 0.5;
}
for ( i = 0; i < XPTS; i++ )
{
xx = x[i];
for ( j = 0; j < YPTS; j++ )
{
yy = y[j];
if ( rosen )
{
z[i][j] = pow( 1. - xx, 2. ) + 100. * pow( yy - pow( xx, 2. ), 2. );
// The log argument might be zero for just the right grid.
if ( z[i][j] > 0. )
z[i][j] = log( z[i][j] );
else
z[i][j] = -5.; // -MAXFLOAT would mess-up up the scale
}
else
{
r = sqrt( xx * xx + yy * yy );
z[i][j] = exp( -r * r ) * cos( 2.0 * M_PI * r );
}
z_row_major[i * YPTS + j] = z[i][j];
z_col_major[i + XPTS * j] = z[i][j];
}
}
// Allocate and calculate y index ranges and corresponding zlimited.
plAlloc2dGrid( &zlimited, XPTS, YPTS );
indexymin = (PLINT *) malloc( XPTS * sizeof ( PLINT ) );
indexymax = (PLINT *) malloc( XPTS * sizeof ( PLINT ) );
if ( !indexymin || !indexymax )
plexit( "Memory allocation error" );
//printf("XPTS = %d\n", XPTS);
//printf("x0 = %f\n", x0);
//printf("a = %f\n", a);
//printf("YPTS = %d\n", YPTS);
//printf("y0 = %f\n", y0);
//printf("b = %f\n", b);
// These values should all be ignored because of the i index range.
#if 0
for ( i = 0; i < indexxmin; i++ )
{
indexymin[i] = 0;
indexymax[i] = YPTS;
for ( j = indexymin[i]; j < indexymax[i]; j++ )
// Mark with large value to check this is ignored.
zlimited[i][j] = 1.e300;
}
#endif
for ( i = indexxmin; i < indexxmax; i++ )
{
square_root = sqrt( 1. - MIN( 1., pow( ( (PLFLT) i - x0 ) / a, 2. ) ) );
// Add 0.5 to find nearest integer and therefore preserve symmetry
// with regard to lower and upper bound of y range.
indexymin[i] = MAX( 0, (PLINT) ( 0.5 + y0 - b * square_root ) );
// indexymax calculated with the convention that it is 1
// greater than highest valid index.
indexymax[i] = MIN( YPTS, 1 + (PLINT) ( 0.5 + y0 + b * square_root ) );
//printf("i, b*square_root, indexymin[i], YPTS - indexymax[i] = %d, %e, %d, %d\n", i, b*square_root, indexymin[i], YPTS - indexymax[i]);
#if 0
// These values should all be ignored because of the j index range.
for ( j = 0; j < indexymin[i]; j++ )
// Mark with large value to check this is ignored.
zlimited[i][j] = 1.e300;
#endif
for ( j = indexymin[i]; j < indexymax[i]; j++ )
zlimited[i][j] = z[i][j];
#if 0
// These values should all be ignored because of the j index range.
for ( j = indexymax[i]; j < YPTS; j++ )
// Mark with large value to check this is ignored.
zlimited[i][j] = 1.e300;
#endif
}
#if 0
// These values should all be ignored because of the i index range.
for ( i = indexxmax; i < XPTS; i++ )
{
indexymin[i] = 0;
indexymax[i] = YPTS;
for ( j = indexymin[i]; j < indexymax[i]; j++ )
// Mark with large value to check this is ignored.
zlimited[i][j] = 1.e300;
}
#endif
plMinMax2dGrid( (const PLFLT * const *) z, XPTS, YPTS, &zmax, &zmin );
step = ( zmax - zmin ) / ( nlevel + 1 );
for ( i = 0; i < nlevel; i++ )
clevel[i] = zmin + step + step * i;
pllightsource( 1., 1., 1. );
for ( k = 0; k < 2; k++ )
{
for ( ifshade = 0; ifshade < 5; ifshade++ )
{
pladv( 0 );
plvpor( 0.0, 1.0, 0.0, 0.9 );
plwind( -1.0, 1.0, -0.9, 1.1 );
plcol0( 3 );
plmtex( "t", 1.0, 0.5, 0.5, title[k] );
plcol0( 1 );
if ( rosen )
plw3d( 1.0, 1.0, 1.0, -1.5, 1.5, -0.5, 1.5, zmin, zmax, alt[k], az[k] );
else
plw3d( 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, zmin, zmax, alt[k], az[k] );
plbox3( "bnstu", "x axis", 0.0, 0,
"bnstu", "y axis", 0.0, 0,
"bcdmnstuv", "z axis", 0.0, 0 );
plcol0( 2 );
if ( ifshade == 0 ) // diffuse light surface plot
{
cmap1_init( 1 );
plfsurf3d( x, y, plf2ops_c(), (PLPointer) z, XPTS, YPTS, 0, NULL, 0 );
}
else if ( ifshade == 1 ) // magnitude colored plot
{
cmap1_init( 0 );
plfsurf3d( x, y, plf2ops_grid_c(), ( PLPointer ) & grid_c, XPTS, YPTS, MAG_COLOR, NULL, 0 );
}
else if ( ifshade == 2 ) // magnitude colored plot with faceted squares
{
cmap1_init( 0 );
plfsurf3d( x, y, plf2ops_grid_row_major(), ( PLPointer ) & grid_row_major, XPTS, YPTS, MAG_COLOR | FACETED, NULL, 0 );
}
else if ( ifshade == 3 ) // magnitude colored plot with contours
{
cmap1_init( 0 );
plfsurf3d( x, y, plf2ops_grid_col_major(), ( PLPointer ) & grid_col_major, XPTS, YPTS, MAG_COLOR | SURF_CONT | BASE_CONT, clevel, nlevel );
}
else // magnitude colored plot with contours and index limits.
{
cmap1_init( 0 );
plsurf3dl( x, y, (const PLFLT * const *) zlimited, XPTS, YPTS, MAG_COLOR | SURF_CONT | BASE_CONT, clevel, nlevel, indexxmin, indexxmax, indexymin, indexymax );
}
}
}
// Clean up
free( (void *) x );
free( (void *) y );
plFree2dGrid( z, XPTS, YPTS );
free( (void *) z_row_major );
free( (void *) z_col_major );
plFree2dGrid( zlimited, XPTS, YPTS );
free( (void *) indexymin );
free( (void *) indexymax );
plend();
exit( 0 );
}
int main( int argc, const char *argv[] )
{
PLFLT *x, *y, **z,
xmin = 0., xmax = 1.0, xmid = 0.5 * ( xmax + xmin ), xrange = xmax - xmin,
ymin = 0., ymax = 1.0, ymid = 0.5 * ( ymax + ymin ), yrange = ymax - ymin,
zmin = 0., zmax = 1.0, zmid = 0.5 * ( zmax + zmin ), zrange = zmax - zmin,
ysmin = ymin + 0.1 * yrange,
ysmax = ymax - 0.1 * yrange,
ysrange = ysmax - ysmin,
dysrot = ysrange / (PLFLT) ( NROTATION - 1 ),
dysshear = ysrange / (PLFLT) ( NSHEAR - 1 ),
zsmin = zmin + 0.1 * zrange,
zsmax = zmax - 0.1 * zrange,
zsrange = zsmax - zsmin,
dzsrot = zsrange / (PLFLT) ( NROTATION - 1 ),
dzsshear = zsrange / (PLFLT) ( NSHEAR - 1 ),
ys, zs,
x_inclination, y_inclination, z_inclination,
x_shear, y_shear, z_shear,
omega, sin_omega, cos_omega, domega;
int i, j;
PLFLT radius, pitch, xpos, ypos, zpos;
// p1string must be exactly one character + the null termination
// character.
char p1string[] = "O";
const char *pstring = "The future of our civilization depends on software freedom.";
// Allocate and define the minimal x, y, and z to insure 3D box
x = (PLFLT *) calloc( XPTS, sizeof ( PLFLT ) );
y = (PLFLT *) calloc( YPTS, sizeof ( PLFLT ) );
plAlloc2dGrid( &z, XPTS, YPTS );
for ( i = 0; i < XPTS; i++ )
{
x[i] = xmin + (double) i * ( xmax - xmin ) / (double) ( XPTS - 1 );
}
for ( j = 0; j < YPTS; j++ )
y[j] = ymin + (double) j * ( ymax - ymin ) / (double) ( YPTS - 1 );
for ( i = 0; i < XPTS; i++ )
{
for ( j = 0; j < YPTS; j++ )
{
z[i][j] = 0.;
}
}
// Parse and process command line arguments
(void) plparseopts( &argc, argv, PL_PARSE_FULL );
plinit();
// Page 1: Demonstrate inclination and shear capability pattern.
pladv( 0 );
plvpor( -0.15, 1.15, -0.05, 1.05 );
plwind( -1.2, 1.2, -0.8, 1.5 );
plw3d( 1.0, 1.0, 1.0, xmin, xmax, ymin, ymax, zmin, zmax,
20., 45. );
plcol0( 2 );
plbox3( "b", "", xmax - xmin, 0,
"b", "", ymax - ymin, 0,
"bcd", "", zmax - zmin, 0 );
// z = zmin.
plschr( 0., 1.0 );
for ( i = 0; i < NREVOLUTION; i++ )
{
omega = 2. * M_PI * ( (PLFLT) i / (PLFLT) NREVOLUTION );
sin_omega = sin( omega );
cos_omega = cos( omega );
x_inclination = 0.5 * xrange * cos_omega;
y_inclination = 0.5 * yrange * sin_omega;
z_inclination = 0.;
x_shear = -0.5 * xrange * sin_omega;
y_shear = 0.5 * yrange * cos_omega;
z_shear = 0.;
plptex3(
xmid, ymid, zmin,
x_inclination, y_inclination, z_inclination,
x_shear, y_shear, z_shear,
0.0, " revolution" );
}
// x = xmax.
plschr( 0., 1.0 );
for ( i = 0; i < NREVOLUTION; i++ )
{
omega = 2. * M_PI * ( (PLFLT) i / (PLFLT) NREVOLUTION );
sin_omega = sin( omega );
cos_omega = cos( omega );
x_inclination = 0.;
y_inclination = -0.5 * yrange * cos_omega;
z_inclination = 0.5 * zrange * sin_omega;
x_shear = 0.;
y_shear = 0.5 * yrange * sin_omega;
z_shear = 0.5 * zrange * cos_omega;
plptex3(
xmax, ymid, zmid,
x_inclination, y_inclination, z_inclination,
x_shear, y_shear, z_shear,
0.0, " revolution" );
}
// y = ymax.
plschr( 0., 1.0 );
for ( i = 0; i < NREVOLUTION; i++ )
{
omega = 2. * M_PI * ( (PLFLT) i / (PLFLT) NREVOLUTION );
sin_omega = sin( omega );
cos_omega = cos( omega );
x_inclination = 0.5 * xrange * cos_omega;
y_inclination = 0.;
z_inclination = 0.5 * zrange * sin_omega;
x_shear = -0.5 * xrange * sin_omega;
y_shear = 0.;
z_shear = 0.5 * zrange * cos_omega;
plptex3(
xmid, ymax, zmid,
x_inclination, y_inclination, z_inclination,
x_shear, y_shear, z_shear,
0.0, " revolution" );
}
// Draw minimal 3D grid to finish defining the 3D box.
plmesh( x, y, (const PLFLT * const *) z, XPTS, YPTS, DRAW_LINEXY );
// Page 2: Demonstrate rotation of string around its axis.
pladv( 0 );
plvpor( -0.15, 1.15, -0.05, 1.05 );
plwind( -1.2, 1.2, -0.8, 1.5 );
plw3d( 1.0, 1.0, 1.0, xmin, xmax, ymin, ymax, zmin, zmax,
20., 45. );
plcol0( 2 );
plbox3( "b", "", xmax - xmin, 0,
"b", "", ymax - ymin, 0,
"bcd", "", zmax - zmin, 0 );
// y = ymax.
plschr( 0., 1.0 );
x_inclination = 1.;
y_inclination = 0.;
z_inclination = 0.;
x_shear = 0.;
for ( i = 0; i < NROTATION; i++ )
{
omega = 2. * M_PI * ( (PLFLT) i / (PLFLT) NROTATION );
sin_omega = sin( omega );
cos_omega = cos( omega );
y_shear = 0.5 * yrange * sin_omega;
z_shear = 0.5 * zrange * cos_omega;
zs = zsmax - dzsrot * (PLFLT) i;
plptex3(
xmid, ymax, zs,
x_inclination, y_inclination, z_inclination,
x_shear, y_shear, z_shear,
0.5, "rotation for y = y#dmax#u" );
}
// x = xmax.
plschr( 0., 1.0 );
x_inclination = 0.;
y_inclination = -1.;
z_inclination = 0.;
y_shear = 0.;
for ( i = 0; i < NROTATION; i++ )
{
omega = 2. * M_PI * ( (PLFLT) i / (PLFLT) NROTATION );
sin_omega = sin( omega );
cos_omega = cos( omega );
x_shear = 0.5 * xrange * sin_omega;
z_shear = 0.5 * zrange * cos_omega;
zs = zsmax - dzsrot * (PLFLT) i;
plptex3(
xmax, ymid, zs,
x_inclination, y_inclination, z_inclination,
x_shear, y_shear, z_shear,
0.5, "rotation for x = x#dmax#u" );
}
// z = zmin.
plschr( 0., 1.0 );
x_inclination = 1.;
y_inclination = 0.;
z_inclination = 0.;
x_shear = 0.;
for ( i = 0; i < NROTATION; i++ )
{
omega = 2. * M_PI * ( (PLFLT) i / (PLFLT) NROTATION );
sin_omega = sin( omega );
cos_omega = cos( omega );
y_shear = 0.5 * yrange * cos_omega;
z_shear = 0.5 * zrange * sin_omega;
ys = ysmax - dysrot * (PLFLT) i;
plptex3(
xmid, ys, zmin,
x_inclination, y_inclination, z_inclination,
x_shear, y_shear, z_shear,
0.5, "rotation for z = z#dmin#u" );
}
// Draw minimal 3D grid to finish defining the 3D box.
plmesh( x, y, (const PLFLT * const *) z, XPTS, YPTS, DRAW_LINEXY );
// Page 3: Demonstrate shear of string along its axis.
// Work around xcairo and pngcairo (but not pscairo) problems for
// shear vector too close to axis of string. (N.B. no workaround
// would be domega = 0.)
domega = 0.05;
pladv( 0 );
plvpor( -0.15, 1.15, -0.05, 1.05 );
plwind( -1.2, 1.2, -0.8, 1.5 );
plw3d( 1.0, 1.0, 1.0, xmin, xmax, ymin, ymax, zmin, zmax,
20., 45. );
plcol0( 2 );
plbox3( "b", "", xmax - xmin, 0,
"b", "", ymax - ymin, 0,
"bcd", "", zmax - zmin, 0 );
// y = ymax.
plschr( 0., 1.0 );
x_inclination = 1.;
y_inclination = 0.;
z_inclination = 0.;
y_shear = 0.;
for ( i = 0; i < NSHEAR; i++ )
{
omega = domega + 2. * M_PI * ( (PLFLT) i / (PLFLT) NSHEAR );
sin_omega = sin( omega );
cos_omega = cos( omega );
x_shear = 0.5 * xrange * sin_omega;
z_shear = 0.5 * zrange * cos_omega;
zs = zsmax - dzsshear * (PLFLT) i;
plptex3(
xmid, ymax, zs,
x_inclination, y_inclination, z_inclination,
x_shear, y_shear, z_shear,
0.5, "shear for y = y#dmax#u" );
}
// x = xmax.
plschr( 0., 1.0 );
x_inclination = 0.;
y_inclination = -1.;
z_inclination = 0.;
x_shear = 0.;
for ( i = 0; i < NSHEAR; i++ )
{
omega = domega + 2. * M_PI * ( (PLFLT) i / (PLFLT) NSHEAR );
sin_omega = sin( omega );
cos_omega = cos( omega );
y_shear = -0.5 * yrange * sin_omega;
z_shear = 0.5 * zrange * cos_omega;
zs = zsmax - dzsshear * (PLFLT) i;
plptex3(
xmax, ymid, zs,
x_inclination, y_inclination, z_inclination,
x_shear, y_shear, z_shear,
0.5, "shear for x = x#dmax#u" );
}
// z = zmin.
plschr( 0., 1.0 );
x_inclination = 1.;
y_inclination = 0.;
z_inclination = 0.;
z_shear = 0.;
for ( i = 0; i < NSHEAR; i++ )
{
omega = domega + 2. * M_PI * ( (PLFLT) i / (PLFLT) NSHEAR );
sin_omega = sin( omega );
cos_omega = cos( omega );
y_shear = 0.5 * yrange * cos_omega;
x_shear = 0.5 * xrange * sin_omega;
ys = ysmax - dysshear * (PLFLT) i;
plptex3(
xmid, ys, zmin,
x_inclination, y_inclination, z_inclination,
x_shear, y_shear, z_shear,
0.5, "shear for z = z#dmin#u" );
}
// Draw minimal 3D grid to finish defining the 3D box.
plmesh( x, y, (const PLFLT * const *) z, XPTS, YPTS, DRAW_LINEXY );
// Page 4: Demonstrate drawing a string on a 3D path.
pladv( 0 );
plvpor( -0.15, 1.15, -0.05, 1.05 );
plwind( -1.2, 1.2, -0.8, 1.5 );
plw3d( 1.0, 1.0, 1.0, xmin, xmax, ymin, ymax, zmin, zmax,
40., -30. );
plcol0( 2 );
plbox3( "b", "", xmax - xmin, 0,
"b", "", ymax - ymin, 0,
"bcd", "", zmax - zmin, 0 );
plschr( 0., 1.2 );
// domega controls the spacing between the various characters of the
// string and also the maximum value of omega for the given number
// of characters in *pstring.
domega = 2. * M_PI / (double) strlen( pstring );
omega = 0.;
// 3D function is a helix of the given radius and pitch
radius = 0.5;
pitch = 1. / ( 2. * M_PI );
while ( *pstring )
{
sin_omega = sin( omega );
cos_omega = cos( omega );
xpos = xmid + radius * sin_omega;
ypos = ymid - radius * cos_omega;
zpos = zmin + pitch * omega;
// In general, the inclination is proportional to the derivative of
// the position wrt theta.
x_inclination = radius * cos_omega;;
y_inclination = radius * sin_omega;
z_inclination = pitch;
// The shear vector should be perpendicular to the 3D line with Z
// component maximized, but for low pitch a good approximation is
// a constant vector that is parallel to the Z axis.
x_shear = 0.;
y_shear = 0.;
z_shear = 1.;
*p1string = *pstring;
plptex3(
xpos, ypos, zpos,
x_inclination, y_inclination, z_inclination,
x_shear, y_shear, z_shear,
0.5, p1string );
pstring++;
omega += domega;
}
// Draw minimal 3D grid to finish defining the 3D box.
plmesh( x, y, (const PLFLT * const *) z, XPTS, YPTS, DRAW_LINEXY );
// Page 5: Demonstrate plmtex3 axis labelling capability
pladv( 0 );
plvpor( -0.15, 1.15, -0.05, 1.05 );
plwind( -1.2, 1.2, -0.8, 1.5 );
plw3d( 1.0, 1.0, 1.0, xmin, xmax, ymin, ymax, zmin, zmax,
20., 45. );
plcol0( 2 );
plbox3( "b", "", xmax - xmin, 0,
"b", "", ymax - ymin, 0,
"bcd", "", zmax - zmin, 0 );
plschr( 0., 1.0 );
plmtex3( "xp", 3.0, 0.5, 0.5, "Arbitrarily displaced" );
plmtex3( "xp", 4.5, 0.5, 0.5, "primary X-axis label" );
plmtex3( "xs", -2.5, 0.5, 0.5, "Arbitrarily displaced" );
plmtex3( "xs", -1.0, 0.5, 0.5, "secondary X-axis label" );
plmtex3( "yp", 3.0, 0.5, 0.5, "Arbitrarily displaced" );
plmtex3( "yp", 4.5, 0.5, 0.5, "primary Y-axis label" );
plmtex3( "ys", -2.5, 0.5, 0.5, "Arbitrarily displaced" );
plmtex3( "ys", -1.0, 0.5, 0.5, "secondary Y-axis label" );
plmtex3( "zp", 4.5, 0.5, 0.5, "Arbitrarily displaced" );
plmtex3( "zp", 3.0, 0.5, 0.5, "primary Z-axis label" );
plmtex3( "zs", -2.5, 0.5, 0.5, "Arbitrarily displaced" );
plmtex3( "zs", -1.0, 0.5, 0.5, "secondary Z-axis label" );
// Draw minimal 3D grid to finish defining the 3D box.
plmesh( x, y, (const PLFLT * const *) z, XPTS, YPTS, DRAW_LINEXY );
// Clean up.
free( (void *) x );
free( (void *) y );
plFree2dGrid( z, XPTS, YPTS );
plend();
exit( 0 );
}
int
main(int argc, char *argv[])
{
int i, j, k;
PLFLT *x, *y, **z;
PLFLT xx, yy;
int nlevel = LEVELS;
PLFLT clevel[LEVELS];
PLFLT zmin, zmax, step;
/* Parse and process command line arguments */
(void) plparseopts(&argc, argv, PL_PARSE_FULL);
/* Initialize plplot */
plinit();
x = (PLFLT *) calloc(XPTS, sizeof(PLFLT));
y = (PLFLT *) calloc(YPTS, sizeof(PLFLT));
plAlloc2dGrid(&z, XPTS, YPTS);
for (i = 0; i < XPTS; i++) {
x[i] = 3. * (double) (i - (XPTS / 2)) / (double) (XPTS / 2);
}
for (i = 0; i < YPTS; i++)
y[i] = 3.* (double) (i - (YPTS / 2)) / (double) (YPTS / 2);
for (i = 0; i < XPTS; i++) {
xx = x[i];
for (j = 0; j < YPTS; j++) {
yy = y[j];
z[i][j] = 3. * (1.-xx)*(1.-xx) * exp(-(xx*xx) - (yy+1.)*(yy+1.)) -
10. * (xx/5. - pow(xx,3.) - pow(yy,5.)) * exp(-xx*xx-yy*yy) -
1./3. * exp(-(xx+1)*(xx+1) - (yy*yy));
if(0) { /* Jungfraujoch/Interlaken */
if (z[i][j] < -1.)
z[i][j] = -1.;
}
}
}
plMinMax2dGrid(z, XPTS, YPTS, &zmax, &zmin);
step = (zmax - zmin)/(nlevel+1);
for (i=0; i<nlevel; i++)
clevel[i] = zmin + step + step*i;
cmap1_init();
for (k = 0; k < 2; k++) {
for (i=0; i<4; i++) {
pladv(0);
plcol0(1);
plvpor(0.0, 1.0, 0.0, 0.9);
plwind(-1.0, 1.0, -1.0, 1.5);
plw3d(1.0, 1.0, 1.2, -3.0, 3.0, -3.0, 3.0, zmin, zmax, alt[k], az[k]);
plbox3("bnstu", "x axis", 0.0, 0,
"bnstu", "y axis", 0.0, 0,
"bcdmnstuv", "z axis", 0.0, 4);
plcol0(2);
/* wireframe plot */
if (i==0)
plmesh(x, y, z, XPTS, YPTS, opt[k]);
/* magnitude colored wireframe plot */
else if (i==1)
plmesh(x, y, z, XPTS, YPTS, opt[k] | MAG_COLOR);
/* magnitude colored wireframe plot with sides */
else if (i==2)
plot3d(x, y, z, XPTS, YPTS, opt[k] | MAG_COLOR, 1);
/* magnitude colored wireframe plot with base contour */
else if (i==3)
plmeshc(x, y, z, XPTS, YPTS, opt[k] | MAG_COLOR | BASE_CONT,
clevel, nlevel);
plcol0(3);
plmtex("t", 1.0, 0.5, 0.5, title[k]);
}
}
/* Clean up */
free((void *) x);
free((void *) y);
plFree2dGrid(z, XPTS, YPTS);
plend();
exit(0);
}
int
main(int argc, char *argv[])
{
PLFLT *x, *y, *z, *clev;
PLFLT *xg, *yg, **zg, **szg;
PLFLT zmin, zmax, lzm, lzM;
long ct;
int i, j, k;
PLINT alg;
char ylab[40], xlab[40];
char *title[] = {"Cubic Spline Approximation",
"Delaunay Linear Interpolation",
"Natural Neighbors Interpolation",
"KNN Inv. Distance Weighted",
"3NN Linear Interpolation",
"4NN Around Inv. Dist. Weighted"};
PLFLT opt[] = {0., 0., 0., 0., 0., 0.};
xm = ym = -0.2;
xM = yM = 0.8;
plMergeOpts(options, "x21c options", NULL);
plparseopts(&argc, argv, PL_PARSE_FULL);
opt[2] = wmin;
opt[3] = (PLFLT) knn_order;
opt[4] = threshold;
/* Initialize plplot */
plinit();
create_data(&x, &y, &z, pts); /* the sampled data */
zmin = z[0];
zmax = z[0];
for (i=1; i<pts; i++) {
if (z[i] > zmax)
zmax = z[i];
if (z[i] < zmin)
zmin = z[i];
}
create_grid(&xg, xp, &yg, yp); /* grid the data at */
plAlloc2dGrid(&zg, xp, yp); /* the output grided data */
clev = (PLFLT *) malloc(nl * sizeof(PLFLT));
sprintf(xlab, "Npts=%d gridx=%d gridy=%d", pts, xp, yp);
plcol0(1);
plenv(xm, xM, ym, yM, 2, 0);
plcol0(15);
pllab(xlab, "", "The original data");
plcol0(2);
plpoin(pts, x, y, 5);
pladv(0);
plssub(3,2);
for (k=0; k<2; k++) {
pladv(0);
for (alg=1; alg<7; alg++) {
ct = clock();
plgriddata(x, y, z, pts, xg, xp, yg, yp, zg, alg, opt[alg-1]);
sprintf(xlab, "time=%d ms", (clock() - ct)/1000);
sprintf(ylab, "opt=%.3f", opt[alg-1]);
/* - CSA can generate NaNs (only interpolates?!).
* - DTLI and NNI can generate NaNs for points outside the convex hull
* of the data points.
* - NNLI can generate NaNs if a sufficiently thick triangle is not found
*
* PLplot should be NaN/Inf aware, but changing it now is quite a job...
* so, instead of not plotting the NaN regions, a weighted average over
* the neighbors is done.
*/
if (alg == GRID_CSA || alg == GRID_DTLI || alg == GRID_NNLI || alg == GRID_NNI) {
int ii, jj;
PLFLT dist, d;
for (i=0; i<xp; i++) {
for (j=0; j<yp; j++) {
if (isnan(zg[i][j])) { /* average (IDW) over the 8 neighbors */
zg[i][j] = 0.; dist = 0.;
for (ii=i-1; ii<=i+1 && ii<xp; ii++) {
for (jj=j-1; jj<=j+1 && jj<yp; jj++) {
if (ii >= 0 && jj >= 0 && !isnan(zg[ii][jj])) {
d = (abs(ii-i) + abs(jj-j)) == 1 ? 1. : 1.4142;
zg[i][j] += zg[ii][jj]/(d*d);
dist += d;
}
}
}
if (dist != 0.)
zg[i][j] /= dist;
else
zg[i][j] = zmin;
}
}
}
}
plMinMax2dGrid(zg, xp, yp, &lzM, &lzm);
plcol0(1);
pladv(alg);
if (k == 0) {
lzm = MIN(lzm, zmin);
lzM = MAX(lzM, zmax);
for (i=0; i<nl; i++)
clev[i] = lzm + (lzM-lzm)/(nl-1)*i;
plenv0(xm, xM, ym, yM, 2, 0);
plcol0(15);
pllab(xlab, ylab, title[alg-1]);
plshades(zg, xp, yp, NULL, xm, xM, ym, yM,
clev, nl, 1, 0, 1, plfill, 1, NULL, NULL);
plcol0(2);
} else {
for (i=0; i<nl; i++)
clev[i] = lzm + (lzM-lzm)/(nl-1)*i;
cmap1_init();
plvpor(0.0, 1.0, 0.0, 0.9);
plwind(-1.0, 1.0, -1.0, 1.5);
/*
* For the comparition to be fair, all plots should have the
* same z values, but to get the max/min of the data generated
* by all algorithms would imply two passes. Keep it simple.
*
* plw3d(1., 1., 1., xm, xM, ym, yM, zmin, zmax, 30, -60);
*/
plw3d(1., 1., 1., xm, xM, ym, yM, lzm, lzM, 30, -60);
plbox3("bnstu", ylab, 0.0, 0,
"bnstu", xlab, 0.0, 0,
"bcdmnstuv", "", 0.0, 4);
plcol0(15);
pllab("", "", title[alg-1]);
plot3dc(xg, yg, zg, xp, yp, DRAW_LINEXY | MAG_COLOR | BASE_CONT, clev, nl);
}
}
}
plend();
free_data(x, y, z);
free_grid(xg, yg);
free((void *)clev);
plFree2dGrid(zg, xp, yp);
}
void
shade(void)
{
int i, j;
PLFLT x, y, argx, argy, distort;
PLFLT **z, **w, zmin, zmax;
PLFLT xg1[XPTS], yg1[YPTS];
PLcGrid cgrid1;
PLcGrid2 cgrid2;
PLFLT shade_min, shade_max, sh_color;
PLINT sh_cmap = 1, sh_width;
PLINT min_color = 1, min_width = 0, max_color = 0, max_width = 0;
/* Set up function arrays */
plAlloc2dGrid(&z, XPTS, YPTS);
plAlloc2dGrid(&w, XPTS, YPTS);
/* Set up data array */
for (i = 0; i < XPTS; i++) {
x = (double) (i - (XPTS / 2)) / (double) (XPTS / 2);
for (j = 0; j < YPTS; j++) {
y = (double) (j - (YPTS / 2)) / (double) (YPTS / 2) - 1.0;
z[i][j] = - sin(7.*x) * cos(7.*y) + x*x - y*y;
w[i][j] = - cos(7.*x) * sin(7.*y) + 2 * x * y;
}
}
f2mnmx(z, XPTS, YPTS, &zmin, &zmax);
for (i = 0; i < NCONTR; i++)
clevel[i] = zmin + (zmax - zmin) * (i + 0.5) / (PLFLT) NCONTR;
/* Set up coordinate grids */
cgrid1.xg = xg1;
cgrid1.yg = yg1;
cgrid1.nx = XPTS;
cgrid1.ny = YPTS;
plAlloc2dGrid(&cgrid2.xg, XPTS, YPTS);
plAlloc2dGrid(&cgrid2.yg, XPTS, YPTS);
cgrid2.nx = XPTS;
cgrid2.ny = YPTS;
for (i = 0; i < XPTS; i++) {
for (j = 0; j < YPTS; j++) {
mypltr((PLFLT) i, (PLFLT) j, &x, &y, NULL);
argx = x * PI/2;
argy = y * PI/2;
distort = 0.4;
cgrid1.xg[i] = x + distort * cos(argx);
cgrid1.yg[j] = y - distort * cos(argy);
cgrid2.xg[i][j] = x + distort * cos(argx) * cos(argy);
cgrid2.yg[i][j] = y - distort * cos(argx) * cos(argy);
}
}
/* Plot using identity transform */
pladv(0);
plvpor(0.1, 0.9, 0.1, 0.9);
plwind(-1.0, 1.0, -1.0, 1.0);
for (i = 0; i < NCONTR; i++) {
shade_min = zmin + (zmax - zmin) * i / (PLFLT) NCONTR;
shade_max = zmin + (zmax - zmin) * (i +1) / (PLFLT) NCONTR;
sh_color = i / (PLFLT) (NCONTR-1);
sh_width = 2;
plpsty(0);
plshade(z, XPTS, YPTS, NULL, -1., 1., -1., 1.,
shade_min, shade_max,
sh_cmap, sh_color, sh_width,
min_color, min_width, max_color, max_width,
plfill, 1, NULL, NULL);
}
plcol(1);
plbox("bcnst", 0.0, 0, "bcnstv", 0.0, 0);
plcol(2);
/*
plcont(w, XPTS, YPTS, 1, XPTS, 1, YPTS, clevel, NCONTR, mypltr, NULL);
*/
pllab("distance", "altitude", "Bogon density");
/* Clean up */
plFree2dGrid(z, XPTS, YPTS);
plFree2dGrid(w, XPTS, YPTS);
plFree2dGrid(cgrid2.xg, XPTS, YPTS);
plFree2dGrid(cgrid2.yg, XPTS, YPTS);
}
/*
* void plfvect()
*
* Internal routine to plot a vector array with arbitrary coordinate
* and vector transformations
*/
void plfvect(PLFLT (*plf2eval) (PLINT, PLINT, PLPointer),
PLPointer f2eval_data1, PLPointer f2eval_data2,
PLINT nx, PLINT ny, PLFLT scale,
void (*pltr) (PLFLT, PLFLT, PLFLT *, PLFLT *, PLPointer),
PLPointer pltr_data) {
PLINT i, j, i1, j1;
PLFLT **u, **v, **x, **y;
PLFLT lscale, dx, dy, dxmin, dymin, umax, vmax;
plAlloc2dGrid(&u, nx, ny);
plAlloc2dGrid(&v, nx, ny);
plAlloc2dGrid(&x, nx, ny);
plAlloc2dGrid(&y, nx, ny);
for (j=0; j<ny; j++) {
for (i=0 ;i<nx ;i++) {
u[i][j] = plf2eval(i,j,f2eval_data1);
v[i][j] = plf2eval(i,j,f2eval_data2);
pltr((PLFLT) i, (PLFLT) j, &x[i][j], &y[i][j], pltr_data);
}
}
/* Calculate apropriate scaling if necessary */
if (scale <= 0.0 ) {
if (nx <= 1 && ny <= 1) {
fprintf(stderr,"plfvect: not enough points for autoscaling\n");
return;
}
dxmin = 10E10;
dymin = 10E10;
for (j=0; j<ny; j++) {
for (i=0 ;i<nx ;i++) {
for (j1=j; j1<ny; j1++) {
for (i1=0 ;i1<nx ;i1++) {
dx = fabs(x[i1][j1]-x[i][j]);
dy = fabs(y[i1][j1]-y[i][j]);
if (dx > 0) {
dxmin = (dx<dxmin)?dx:dxmin;
}
if (dy > 0) {
dymin = (dy<dymin)?dy:dymin;
}
}
}
}
}
umax = u[0][0];
vmax = v[0][0];
for (j=0; j<ny; j++) {
for (i=0 ;i<nx ;i++) {
umax = (u[i][j]>umax)?u[i][j]:umax;
vmax = (v[i][j]>vmax)?v[i][j]:vmax;
}
}
umax = umax/dxmin;
vmax = vmax/dymin;
lscale = (umax<vmax)?umax:vmax;
lscale = 1.5/lscale;
if (scale < 0.0) {
scale = -scale*lscale;
}
else {
scale = lscale;
}
}
for (j=0; j<ny; j++) {
for (i=0 ;i<nx ;i++) {
plP_plotvect(x[i][j],y[i][j],u[i][j],v[i][j],scale);
}
}
plFree2dGrid(u, nx, ny);
plFree2dGrid(v, nx, ny);
plFree2dGrid(x, nx, ny);
plFree2dGrid(y, nx, ny);
}