void
plot3( void )
{
PLINT space0 = 0, mark0 = 0, space1 = 1500, mark1 = 1500;
int i;
// For the final graph we wish to override the default tick intervals, and
// so do not use plenv().
//
pladv( 0 );
// Use standard viewport, and define X range from 0 to 360 degrees, Y range
// from -1.2 to 1.2.
//
plvsta();
plwind( 0.0, 360.0, -1.2, 1.2 );
// Draw a box with ticks spaced 60 degrees apart in X, and 0.2 in Y.
plcol0( 1 );
plbox( "bcnst", 60.0, 2, "bcnstv", 0.2, 2 );
// Superimpose a dashed line grid, with 1.5 mm marks and spaces.
// plstyl expects a pointer!
//
plstyl( 1, &mark1, &space1 );
plcol0( 2 );
plbox( "g", 30.0, 0, "g", 0.2, 0 );
plstyl( 0, &mark0, &space0 );
plcol0( 3 );
pllab( "Angle (degrees)", "sine", "#frPLplot Example 1 - Sine function" );
for ( i = 0; i < 101; i++ )
{
x[i] = 3.6 * i;
y[i] = sin( x[i] * M_PI / 180.0 );
}
plcol0( 4 );
plline( 101, x, y );
}
void
plot3( void )
{
int i;
// For the final graph we wish to override the default tick intervals, and
// so do not use PLENV
pladv( 0 );
// Use standard viewport, and define X range from 0 to 360 degrees, Y range
// from -1.2 to 1.2.
plvsta();
plwind( (PLFLT) 0.0, (PLFLT) 360.0, (PLFLT) -1.2, (PLFLT) 1.2 );
// Draw a box with ticks spaced 60 degrees apart in X, and 0.2 in Y.
plcol0( 1 );
plbox( "bcnst", (PLFLT) 60.0, 2, "bcnstv", (PLFLT) 0.2, 2 );
// Superimpose a dashed line grid, with 1.5 mm marks and spaces. plstyl
// expects a pointer!!
plstyl( 1, &mark1, &space1 );
plcol0( 2 );
plbox( "g", (PLFLT) 30.0, 0, "g", (PLFLT) 0.2, 0 );
plstyl( 0, &mark0, &space0 );
plcol0( 3 );
pllab( "Angle (degrees)", "sine", "#frPLplot Example 1 - Sine function" );
for ( i = 0; i < 101; i++ )
{
x[i] = 3.6 * i;
y[i] = sin( x[i] * 3.141592654 / 180.0 );
}
plcol0( 4 );
plline( 101, x, y );
}
void
c_pllsty(PLINT lin)
{
if (plsc->level < 1) {
plabort("pllsty: Please call plinit first");
return;
}
if (lin < 1 || lin > 8) {
plabort("pllsty: Invalid line style");
return;
}
plstyl(line[lin - 1].nels,
&line[lin - 1].mark[0], &line[lin - 1].space[0]);
}
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
plshade_int( PLFLT ( *f2eval )( PLINT, PLINT, PLPointer ),
PLPointer f2eval_data,
PLFLT ( * c2eval )( PLINT, PLINT, PLPointer ), // unused, but macro doesn't work
PLPointer PL_UNUSED( c2eval_data ),
PLINT ( *defined )( PLFLT, PLFLT ),
PLINT nx, PLINT ny,
PLFLT xmin, PLFLT xmax, PLFLT ymin, PLFLT ymax,
PLFLT shade_min, PLFLT shade_max,
PLINT sh_cmap, PLFLT sh_color, PLFLT sh_width,
PLINT min_color, PLFLT min_width,
PLINT max_color, PLFLT max_width,
void ( *fill )( PLINT, const PLFLT *, const PLFLT * ), PLINT rectangular,
void ( *pltr )( PLFLT, PLFLT, PLFLT *, PLFLT *, PLPointer ),
PLPointer pltr_data )
{
PLINT n, slope = 0, ix, iy;
int count, i, j, nxny;
PLFLT *a, *a0, *a1, dx, dy;
PLFLT x[8], y[8], xp[2], tx, ty, init_width;
int *c, *c0, *c1;
(void) c2eval; // Cast to void to silence compiler warning about unused parameter
if ( plsc->level < 3 )
{
plabort( "plfshade: window must be set up first" );
return;
}
if ( nx <= 0 || ny <= 0 )
{
plabort( "plfshade: nx and ny must be positive" );
return;
}
if ( shade_min >= shade_max )
{
plabort( "plfshade: shade_max must exceed shade_min" );
return;
}
if ( pltr == NULL && plsc->coordinate_transform == NULL )
rectangular = 1;
int_val = shade_max - shade_min;
init_width = plsc->width;
pen_col_min = min_color;
pen_col_max = max_color;
pen_wd_min = min_width;
pen_wd_max = max_width;
plstyl( (PLINT) 0, NULL, NULL );
plwidth( sh_width );
if ( fill != NULL )
{
switch ( sh_cmap )
{
case 0:
plcol0( (PLINT) sh_color );
break;
case 1:
plcol1( sh_color );
break;
default:
plabort( "plfshade: invalid color map selection" );
return;
}
}
// alloc space for value array, and initialize
// This is only a temporary kludge
nxny = nx * ny;
if ( ( a = (PLFLT *) malloc( (size_t) nxny * sizeof ( PLFLT ) ) ) == NULL )
{
plabort( "plfshade: unable to allocate memory for value array" );
return;
}
for ( ix = 0; ix < nx; ix++ )
for ( iy = 0; iy < ny; iy++ )
a[iy + ix * ny] = f2eval( ix, iy, f2eval_data );
// alloc space for condition codes
if ( ( c = (int *) malloc( (size_t) nxny * sizeof ( int ) ) ) == NULL )
{
plabort( "plfshade: unable to allocate memory for condition codes" );
free( a );
return;
}
sh_min = shade_min;
sh_max = shade_max;
set_cond( c, a, nxny );
dx = ( xmax - xmin ) / ( nx - 1 );
dy = ( ymax - ymin ) / ( ny - 1 );
a0 = a;
a1 = a + ny;
c0 = c;
c1 = c + ny;
for ( ix = 0; ix < nx - 1; ix++ )
{
for ( iy = 0; iy < ny - 1; iy++ )
{
count = c0[iy] + c0[iy + 1] + c1[iy] + c1[iy + 1];
// No filling needs to be done for these cases
if ( count >= UNDEF )
continue;
if ( count == 4 * POS )
continue;
if ( count == 4 * NEG )
continue;
// Entire rectangle can be filled
if ( count == 4 * OK )
{
// find biggest rectangle that fits
if ( rectangular )
{
big_recl( c0 + iy, ny, nx - ix, ny - iy, &i, &j );
}
else
{
i = j = 1;
}
x[0] = x[1] = ix;
x[2] = x[3] = ix + i;
y[0] = y[3] = iy;
y[1] = y[2] = iy + j;
if ( pltr )
{
for ( i = 0; i < 4; i++ )
{
( *pltr )( x[i], y[i], &tx, &ty, pltr_data );
x[i] = tx;
y[i] = ty;
}
}
else
{
for ( i = 0; i < 4; i++ )
{
x[i] = xmin + x[i] * dx;
y[i] = ymin + y[i] * dy;
}
}
if ( fill != NULL )
exfill( fill, defined, (PLINT) 4, x, y );
iy += j - 1;
continue;
}
// Only part of rectangle can be filled
n_point = min_points = max_points = 0;
n = find_interval( a0[iy], a0[iy + 1], c0[iy], c0[iy + 1], xp );
for ( j = 0; j < n; j++ )
{
x[j] = ix;
y[j] = iy + xp[j];
}
i = find_interval( a0[iy + 1], a1[iy + 1],
c0[iy + 1], c1[iy + 1], xp );
for ( j = 0; j < i; j++ )
{
x[j + n] = ix + xp[j];
y[j + n] = iy + 1;
}
n += i;
i = find_interval( a1[iy + 1], a1[iy], c1[iy + 1], c1[iy], xp );
for ( j = 0; j < i; j++ )
{
x[n + j] = ix + 1;
y[n + j] = iy + 1 - xp[j];
}
n += i;
i = find_interval( a1[iy], a0[iy], c1[iy], c0[iy], xp );
for ( j = 0; j < i; j++ )
{
x[n + j] = ix + 1 - xp[j];
y[n + j] = iy;
}
n += i;
if ( pltr )
{
for ( i = 0; i < n; i++ )
{
( *pltr )( x[i], y[i], &tx, &ty, pltr_data );
x[i] = tx;
y[i] = ty;
}
}
else
{
for ( i = 0; i < n; i++ )
{
x[i] = xmin + x[i] * dx;
y[i] = ymin + y[i] * dy;
}
}
if ( min_points == 4 )
slope = plctestez( a, nx, ny, ix, iy, shade_min );
if ( max_points == 4 )
slope = plctestez( a, nx, ny, ix, iy, shade_max );
// n = number of end of line segments
// min_points = number times shade_min meets edge
// max_points = number times shade_max meets edge
// special cases: check number of times a contour is in a box
switch ( ( min_points << 3 ) + max_points )
{
case 000:
case 020:
case 002:
case 022:
if ( fill != NULL && n > 0 )
exfill( fill, defined, n, x, y );
break;
case 040: // 2 contour lines in box
case 004:
if ( n != 6 )
fprintf( stderr, "plfshade err n=%d !6", (int) n );
if ( slope == 1 && c0[iy] == OK )
{
if ( fill != NULL )
exfill( fill, defined, n, x, y );
}
else if ( slope == 1 )
{
selected_polygon( fill, defined, x, y, 0, 1, 2, -1 );
selected_polygon( fill, defined, x, y, 3, 4, 5, -1 );
}
else if ( c0[iy + 1] == OK )
{
if ( fill != NULL )
exfill( fill, defined, n, x, y );
}
else
{
selected_polygon( fill, defined, x, y, 0, 1, 5, -1 );
selected_polygon( fill, defined, x, y, 2, 3, 4, -1 );
}
break;
case 044:
if ( n != 8 )
fprintf( stderr, "plfshade err n=%d !8", (int) n );
if ( slope == 1 )
{
selected_polygon( fill, defined, x, y, 0, 1, 2, 3 );
selected_polygon( fill, defined, x, y, 4, 5, 6, 7 );
}
else
{
selected_polygon( fill, defined, x, y, 0, 1, 6, 7 );
selected_polygon( fill, defined, x, y, 2, 3, 4, 5 );
}
break;
case 024:
case 042:
// 3 contours
if ( n != 7 )
fprintf( stderr, "plfshade err n=%d !7", (int) n );
if ( ( c0[iy] == OK || c1[iy + 1] == OK ) && slope == 1 )
{
if ( fill != NULL )
exfill( fill, defined, n, x, y );
}
else if ( ( c0[iy + 1] == OK || c1[iy] == OK ) && slope == 0 )
{
if ( fill != NULL )
exfill( fill, defined, n, x, y );
}
else if ( c0[iy] == OK )
{
selected_polygon( fill, defined, x, y, 0, 1, 6, -1 );
selected_polygon( fill, defined, x, y, 2, 3, 4, 5 );
}
else if ( c0[iy + 1] == OK )
{
selected_polygon( fill, defined, x, y, 0, 1, 2, -1 );
selected_polygon( fill, defined, x, y, 3, 4, 5, 6 );
}
else if ( c1[iy + 1] == OK )
{
selected_polygon( fill, defined, x, y, 0, 1, 5, 6 );
selected_polygon( fill, defined, x, y, 2, 3, 4, -1 );
}
else if ( c1[iy] == OK )
{
selected_polygon( fill, defined, x, y, 0, 1, 2, 3 );
selected_polygon( fill, defined, x, y, 4, 5, 6, -1 );
}
else
{
fprintf( stderr, "plfshade err logic case 024:042\n" );
}
break;
default:
fprintf( stderr, "prog err switch\n" );
break;
}
draw_boundary( slope, x, y );
if ( fill != NULL )
{
plwidth( sh_width );
if ( sh_cmap == 0 )
plcol0( (PLINT) sh_color );
else if ( sh_cmap == 1 )
plcol1( sh_color );
}
}
a0 = a1;
c0 = c1;
a1 += ny;
c1 += ny;
}
free( c );
free( a );
plwidth( init_width );
}