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/*****
* drawpath3.cc
*
* Stores a path3 that has been added to a picture.
*****/
#include "drawpath3.h"
namespace camp {
using vm::array;
bool drawPath3::write(prcfile *out, unsigned int *count, array *, array *,
double, groupsmap&)
{
Int n=g.length();
if(n == 0 || invisible)
return true;
if(straight) {
Triple *controls=new(UseGC) Triple[n+1];
for(Int i=0; i <= n; ++i)
store(controls[i],g.point(i));
out->addLine(n+1,controls,color);
} else {
int m=3*n+1;
Triple *controls=new(UseGC) Triple[m];
store(controls[0],g.point((Int) 0));
store(controls[1],g.postcontrol((Int) 0));
size_t k=1;
for(Int i=1; i < n; ++i) {
store(controls[++k],g.precontrol(i));
store(controls[++k],g.point(i));
store(controls[++k],g.postcontrol(i));
}
store(controls[++k],g.precontrol(n));
store(controls[++k],g.point(n));
out->addBezierCurve(m,controls,color);
}
return true;
}
void drawPath3::render(GLUnurbs *nurb, double, const triple&, const triple&,
double, bool transparent)
{
#ifdef HAVE_GL
Int n=g.length();
if(n == 0 || invisible || ((color.A < 1.0) ^ transparent))
return;
bool havebillboard=interaction == BILLBOARD;
GLfloat Diffuse[]={0.0,0.0,0.0,color.A};
glMaterialfv(GL_FRONT,GL_DIFFUSE,Diffuse);
static GLfloat Black[]={0.0,0.0,0.0,1.0};
glMaterialfv(GL_FRONT,GL_AMBIENT,Black);
GLfloat Emissive[]={color.R,color.G,color.B,color.A};
glMaterialfv(GL_FRONT,GL_EMISSION,Emissive);
glMaterialfv(GL_FRONT,GL_SPECULAR,Black);
glMaterialf(GL_FRONT,GL_SHININESS,128.0);
if(havebillboard) BB.init();
if(straight) {
glBegin(GL_LINE_STRIP);
for(Int i=0; i <= n; ++i) {
triple v=g.point(i);
if(havebillboard) {
static GLfloat controlpoints[3];
BB.store(controlpoints,v,center);
glVertex3fv(controlpoints);
} else
glVertex3f(v.getx(),v.gety(),v.getz());
}
glEnd();
} else {
for(Int i=0; i < n; ++i) {
static GLfloat knots[8]={0.0,0.0,0.0,0.0,1.0,1.0,1.0,1.0};
static GLfloat controlpoints[12];
if(havebillboard) {
BB.store(controlpoints,g.point(i),center);
BB.store(controlpoints+3,g.postcontrol(i),center);
BB.store(controlpoints+6,g.precontrol(i+1),center);
BB.store(controlpoints+9,g.point(i+1),center);
} else {
store(controlpoints,g.point(i));
store(controlpoints+3,g.postcontrol(i));
store(controlpoints+6,g.precontrol(i+1));
store(controlpoints+9,g.point(i+1));
}
gluBeginCurve(nurb);
gluNurbsCurve(nurb,8,knots,3,controlpoints,4,GL_MAP1_VERTEX_3);
gluEndCurve(nurb);
}
}
#endif
}
drawElement *drawPath3::transformed(const array& t)
{
return new drawPath3(t,this);
}
bool drawNurbsPath3::write(prcfile *out, unsigned int *count, array *index,
array *origin, double, groupsmap&)
{
if(invisible)
return true;
out->addCurve(degree,n,controls,knots,color,weights);
return true;
}
// Approximate bounds by bounding box of control polyhedron.
void drawNurbsPath3::bounds(bbox3& b)
{
double *v=controls[0];
double x=v[0];
double y=v[1];
double z=v[2];
double X=x;
double Y=y;
double Z=z;
for(size_t i=1; i < n; ++i) {
double *v=controls[i];
double vx=v[0];
x=min(x,vx);
X=max(X,vx);
double vy=v[1];
y=min(y,vy);
Y=max(Y,vy);
double vz=v[2];
z=min(z,vz);
Z=max(Z,vz);
}
Min=triple(x,y,z);
Max=triple(X,Y,Z);
b.add(Min);
b.add(Max);
}
drawElement *drawNurbsPath3::transformed(const array& t)
{
return new drawNurbsPath3(t,this);
}
void drawNurbsPath3::ratio(pair &b, double (*m)(double, double), double,
bool &first)
{
if(first) {
first=false;
double *ci=controls[0];
triple v=triple(ci[0],ci[1],ci[2]);
b=pair(xratio(v),yratio(v));
}
double x=b.getx();
double y=b.gety();
for(size_t i=0; i < n; ++i) {
double *ci=controls[i];
triple v=triple(ci[0],ci[1],ci[2]);
x=m(x,xratio(v));
y=m(y,yratio(v));
}
b=pair(x,y);
}
void drawNurbsPath3::displacement()
{
#ifdef HAVE_GL
size_t nknots=degree+n+1;
if(Controls == NULL) {
Controls=new(UseGC) GLfloat[(weights ? 4 : 3)*n];
Knots=new(UseGC) GLfloat[nknots];
}
if(weights)
for(size_t i=0; i < n; ++i)
store(Controls+4*i,controls[i],weights[i]);
else
for(size_t i=0; i < n; ++i)
store(Controls+3*i,controls[i]);
for(size_t i=0; i < nknots; ++i)
Knots[i]=knots[i];
#endif
}
void drawNurbsPath3::render(GLUnurbs *nurb, double, const triple&,
const triple&, double, bool transparent)
{
#ifdef HAVE_GL
if(invisible || ((color.A < 1.0) ^ transparent))
return;
GLfloat Diffuse[]={0.0,0.0,0.0,color.A};
glMaterialfv(GL_FRONT,GL_DIFFUSE,Diffuse);
static GLfloat Black[]={0.0,0.0,0.0,1.0};
glMaterialfv(GL_FRONT,GL_AMBIENT,Black);
GLfloat Emissive[]={color.R,color.G,color.B,color.A};
glMaterialfv(GL_FRONT,GL_EMISSION,Emissive);
glMaterialfv(GL_FRONT,GL_SPECULAR,Black);
glMaterialf(GL_FRONT,GL_SHININESS,128.0);
if(weights)
gluNurbsCallback(nurb,GLU_NURBS_VERTEX,(_GLUfuncptr) glVertex4fv);
else gluNurbsCallback(nurb,GLU_NURBS_VERTEX,(_GLUfuncptr) glVertex3fv);
gluBeginCurve(nurb);
int order=degree+1;
gluNurbsCurve(nurb,order+n,Knots,weights ? 4 : 3,Controls,order,
weights ? GL_MAP1_VERTEX_4 : GL_MAP1_VERTEX_3);
gluEndCurve(nurb);
if(weights)
gluNurbsCallback(nurb,GLU_NURBS_VERTEX,(_GLUfuncptr) glVertex3fv);
#endif
}
} //namespace camp
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