#
# Some examples of proper piecewise linear sampling in gpolyline.
#
save_res = resolution;

save_mat = view_mat;

view_mat = rotx( 0 );
viewobj( view_mat );

view_mat = save_mat;

viewstate( "DblBuffer", 1 );
viewstate( "DepthCue", 1 );

DLevel = iritState( "DumpLevel", 255 );
IProd = iritstate( "InterpProd", 0 );

#############################################################################

pl2 = nil();
for ( x = 0, 1, 5,
	snoc(point(cos(x * Pi / 10), sin(x * Pi / 10), 0.0), pl2)
    );
free( x );
crv1 = cinterp( pl2, 4, 4, PARAM_UNIFORM, false );
viewobj( list( pl2, crv1 ) );

crv2 = cbspline( 5,
		 list( ctlpt( E1, 0.0 ),
		       ctlpt( E1, 0.0 ),
		       ctlpt( E1, 0.0 ),
		       ctlpt( E1, 0.0 ),
		       ctlpt( E1, 1.0 ) ),
		 list( KV_OPEN ) );
cbsp = compose( crv1, crv2 );
free( crv1 );
free( crv2 );

steps = 8;
pt_lst = nil();
for ( i = 0, 1, steps - 1,
	pt = ceval( cbsp, nth( pdomain(cbsp), 2 ) * i / (steps - 1) ):
	snoc( pt, pt_lst )
    );
cpl = poly( pt_lst, true );
color( cpl, green );

resolution = 0.02;
cbsp2 = cbsp;
cpl2 = gpolyline( cbsp2, 2 );
color( cpl2, yellow );
resolution = 20;

interact( list( cbsp, cpl2, cpl ) );
save( "gpolyln1", list( cbsp, cpl2, cpl ) );

#############################################################################

cbsp = cbspline( 3,
		 list( ctlpt( E2, 0.0, -1.0 ),
		       ctlpt( E2, 0.3,  1.0 ),
		       ctlpt( E2, 0.7, -1.0 ),
		       ctlpt( E2, 1.0,  1.0 ) ),
		 list( KV_OPEN ) );
color(cbsp, red);

steps = 8;
pt_lst = nil();
for ( i = 0, 1, steps - 1,
	pt = ceval( cbsp, nth( pdomain(cbsp), 2 ) * i / (steps - 1) ):
	snoc( pt, pt_lst )
    );
free( i );
cpl = poly( pt_lst, true );
color( cpl, green );

resolution = 0.03;
cbsp2 = cbsp;
cpl2 = gpolyline( cbsp2, 2 );
color( cpl2, yellow );
resolution = 20;

interact( list( cbsp, cpl2, cpl ) );
save( "gpolyln2", list( cbsp, cpl2, cpl ) );

#############################################################################

pl2 = nil();
for ( x = 0, 1, 15,
	snoc(point(x / 10 - 1, sin(x * Pi / 5), 0.0), pl2)
    );
free( x );
cbsp = cinterp( pl2, 3, 5, PARAM_UNIFORM, false );
free( pl2 );
color( cbsp, red );
viewobj(cbsp);

steps = 8;
pt_lst = nil();
for ( i = 0, 1, steps - 1,
	pt = ceval( cbsp, nth( pdomain(cbsp), 2 ) * i / (steps - 1) ):
	snoc( pt, pt_lst )
    );
cpl = poly( pt_lst, true );
color(cpl, green);

resolution = 0.03;
cbsp2 = cbsp;
cpl2 = gpolyline( cbsp2, 2 );
color(cpl2, yellow);
resolution = 20;

interact( list( cbsp, cpl2, cpl ) );
save( "gpolyln3", list( cbsp, cpl2, cpl ) );

#############################################################################

cbsp = cbspline( 3,
		 list( ctlpt( E2, 0.0,   0.0 ),
		       ctlpt( E2, 0.45,  1.0 ),
		       ctlpt( E2, 0.55,  1.0 ),
		       ctlpt( E2, 1.0,   0.0 ) ),
		 list( KV_OPEN ) );
color( cbsp, red );

steps = 4;
pt_lst = nil();
for ( i = 0, 1, steps - 1,
	pt = ceval( cbsp, nth( pdomain( cbsp ), 2 ) * i / ( steps - 1 ) ):
	snoc( pt, pt_lst )
    );
free( i );
cpl = poly( pt_lst, true );
free( pt_lst );
free( pt );
free( steps );
color( cpl, green );

resolution = 0.005;
cbsp2 = cbsp;
cpl2 = gpolyline( cbsp2, 2 );
free( cbsp2 );
color( cpl2, yellow );
resolution = 20;

interact( list( cbsp, cpl2, cpl ) );
save( "gpolyln4", list( cbsp, cpl2, cpl ) );

free( cbsp );
free( cpl2 );
free( cpl );

dummy = iritState( "DumpLevel", DLevel );
free( DLevel );
dummy = iritstate( "InterpProd", IProd );
free( IProd );

resolution = save_res;