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Torus.cpp
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Torus.cpp
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#include "Torus.h"
//#include "WorldTranslate.H"
Torus::Torus() {
_slices = 32;
_stacks = 96;//24
_a = 0.0;
_b = 0.0;
_c = 0.0;
first = 1;
initialize_colors();
calculate_geometry();
}
void Torus::initialize_colors() {
/*
_colorArray[0][0] = 255; _colorArray[0][1] = 62; _colorArray[0][2] = 150;
_colorArray[1][0] = 255; _colorArray[1][1] = 255; _colorArray[1][2] = 255;
_colorArray[2][0] = 0; _colorArray[2][1] = 0; _colorArray[2][2] = 128;
_colorArray[3][0] = 255; _colorArray[3][1] = 255; _colorArray[3][2] = 0;
_colorArray[4][0] = 0; _colorArray[4][1] = 100; _colorArray[4][2] = 0;
_colorArray[5][0] = 102; _colorArray[5][1] = 205; _colorArray[5][2] = 0;
_colorArray[6][0] = 154; _colorArray[6][1] = 205; _colorArray[6][2] = 50;
_colorArray[7][0] = 255; _colorArray[7][1] = 215; _colorArray[7][2] = 0;
_colorArray[8][0] = 255; _colorArray[8][1] = 165; _colorArray[8][2] = 0;
_colorArray[9][0] = 255; _colorArray[9][1] = 99; _colorArray[9][2] = 71;
_colorArray[10][0] = 255; _colorArray[10][1] = 0; _colorArray[10][2] = 0;
_colorArray[11][0] = 205; _colorArray[11][1] = 38; _colorArray[11][2] = 38;
*/
/*
_colorArray[0][0] = 255; _colorArray[0][1] = 110; _colorArray[0][2] = 180;
_colorArray[2][0] = 255; _colorArray[2][1] = 255; _colorArray[2][2] = 255;
_colorArray[4][0] = 0; _colorArray[3][1] = 0; _colorArray[4][2] = 128;
_colorArray[6][0] = 255; _colorArray[6][1] = 255; _colorArray[6][2] = 0;
_colorArray[8][0] = 0; _colorArray[8][1] = 100; _colorArray[8][2] = 0;
_colorArray[10][0] = 102; _colorArray[10][1] = 205; _colorArray[10][2] = 0;
_colorArray[12][0] = 154; _colorArray[12][1] = 205; _colorArray[12][2] = 50;
_colorArray[14][0] = 255; _colorArray[14][1] = 215; _colorArray[14][2] = 0;
_colorArray[16][0] = 255; _colorArray[16][1] = 165; _colorArray[16][2] = 0;
_colorArray[18][0] = 255; _colorArray[18][1] = 99; _colorArray[18][2] = 71;
_colorArray[20][0] = 255; _colorArray[20][1] = 0; _colorArray[20][2] = 0;
_colorArray[22][0] = 205; _colorArray[22][1] = 38; _colorArray[22][2] = 38;
*/
// Colorscheme from PIC24.GIF, d/l from the web
// yellow -> orange
_colorArray[0][0] = 249/255.0; _colorArray[0][1] = 255/255.0; _colorArray[0][2] = 90/255.0;
_colorArray[1][0] = 249/255.0; _colorArray[1][1] = 217/255.0; _colorArray[1][2] = 25/255.0;
_colorArray[2][0] = 252/255.0; _colorArray[2][1] = 152/255.0; _colorArray[2][2] = 64/255.0;
// red ->blue-pink
_colorArray[3][0] = 252/255.0; _colorArray[3][1] = 21/255.0; _colorArray[3][2] = 47/255.0;
_colorArray[4][0] = 250/255.0; _colorArray[4][1] = 5/255.0; _colorArray[4][2] = 152/255.0;
_colorArray[5][0] = 245/255.0; _colorArray[5][1] = 26/255.0; _colorArray[5][2] = 250/255.0;
// violet->medium blue
_colorArray[6][0] = 178/255.0; _colorArray[6][1] = 5/255.0; _colorArray[6][2] = 239/255.0;
_colorArray[7][0] = 81/255.0; _colorArray[7][1] = 2/255.0; _colorArray[7][2] = 211/255.0;
_colorArray[8][0] = 11/255.0; _colorArray[8][1] = 5/255.0; _colorArray[8][2] = 187/255.0;
// dark blue ->greenish blue
_colorArray[9][0] = 4/255.0; _colorArray[9][1] = 46/255.0; _colorArray[9][2] = 156/255.0;
_colorArray[10][0] = 4/255.0; _colorArray[10][1] = 136/255.0; _colorArray[10][2] = 162/255.0;
_colorArray[11][0] = 4/255.0; _colorArray[11][1] = 184/255.0; _colorArray[11][2] = 167/255.0;
// green -> yellow green
_colorArray[12][0] = 4/255.0; _colorArray[12][1] = 216/255.0; _colorArray[12][2] = 111/255.0;
_colorArray[13][0] = 7/255.0; _colorArray[13][1] = 184/255.0; _colorArray[13][2] = 25/255.0;
_colorArray[14][0] = 48/255.0; _colorArray[14][1] = 232/255.0; _colorArray[14][2] = 4/255.0;
_colorArray[15][0] = 185/255.0; _colorArray[15][1] = 250/255.0; _colorArray[15][2] = 12/255.0;
}
void Torus::manual_increment(int code) {
switch (code) {
case 1 : if ((_a+_b+_c)<1) _a = _a + 0.05;
break;
case 2: if ((_a+_b+_c)<1) _b = _b + 0.05;
break;
case 3: if ((_a+_b+_c)<1) _c = _c + 0.05;
break;
case 4 : if ((_a+_b+_c)>0) _a = _a - 0.05;
break;
case 5: if ((_a+_b+_c)>0) _b = _b - 0.05;
break;
case 6: if ((_a+_b+_c)>0) _c = _c - 0.05;
break;
}
fprintf(stderr,"Values of a, b, c inside Torus::manual_increment are %f, %f, %f\n " , _a, _b, _c);
calculate_geometry();
}
//given new values of a,b,c update the private variables..
void Torus::update_geometry(double a, double b, double c) {
// shifter to Tetrahedron.C
/* double MIN_EPSILON = 1e-5;
double MAX_EPSILON = 0.3;
double distance = (a-_a)*(a-_a) + (b-_b)*(b-_b) + (c-_c)*(c-_c);
distance = sqrt(distance);
if ((distance>MIN_EPSILON) && (distance<MAX_EPSILON))
*/
{ // recalculate things only if distance is less then threshold (to precent small movements)
// OR if distance is less than great change (flickering)
_a = a;
_b = b;
_c = c;
calculate_geometry();
}
}
void Torus::calculate_geometry() {
double theta, ntheta;
double phi, nphi;
double x,y,u,v;
double nx, ny, nu, nv;
Vector3 pt1, pt2, pt3;
Vector3 norm1, norm2, ncross;
double x1,x2,x3,x4;
double y1,y2,y3,y4;
double z1,z2,z3,z4;
double den1,den2,den3,den4;
double d,den;
if (_vertices.size()>0)
_vertices.clear();
if (_normals.size()>0)
_normals.clear();
if (_colors.size()>0)
_colors.clear();
d = 1 - (_a+_b+_c);
den = sqrt(2) * sqrt(_a*_a + _b*_b + _c*_c + d*d);
for (int j=0; j<_slices; j++) {
phi = ((2*M_PI* j ) /_slices);
nphi = ((2*M_PI*(j+1))/_slices);
u = cos(phi);
v = sin(phi);
nu = cos(nphi);
nv = sin(nphi);
if (j%2==0) { // Planes....
for (int i=0; i<_stacks; i++) { // # stacks = _par2 till _par2 for tip !!
int ci = (int) floor(((double)j)/2.0);
theta = ((2*M_PI* i) / _stacks);
ntheta = (2*M_PI*(i+1)/ _stacks);
x = cos(theta);
y = sin(theta);
nx = cos(ntheta);
ny = sin(ntheta);
x1 = - _b*x + _a*y - d*u + _c*v ;
x2 = - _b*nx + _a*ny - d*u + _c*v ;
x3 = - _b*nx + _a*ny - d*nu + _c*nv;
x4 = - _b*x + _a*y - d*nu + _c*nv;
y1 = - _c*x + d*y + _a*u - _b*v ;
y2 = - _c*nx + d*ny + _a*u - _b*v ;
y3 = - _c*nx + d*ny + _a*nu - _b*nv;
y4 = - _c*x + d*y + _a*nu - _b*nv;
z1 = - d*x - _c*y + _b*u + _a*v ;
z2 = - d*nx - _c*ny + _b*u + _a*v ;
z3 = - d*nx - _c*ny + _b*nu + _a*nv;
z4 = - d*x - _c*y + _b*nu + _a*nv;
den1 = (_a*x + _b*y + _c*u + d*v );
den2 = (_a*nx + _b*ny + _c*u + d*v );
den3 = (_a*nx + _b*ny + _c*nu + d*nv );
den4 = (_a*x + _b*y + _c*nu + d*nv );
// triangle ABD...............
// Point D........
pt3[1]= x4/(den - den4);
pt3[0]= y4/(den - den4);
pt3[2]= z4/(den - den4);
// Point A........
pt1[1]= x1/(den - den1);
pt1[0]= y1/(den - den1);
pt1[2]= z1/(den - den1);
// Point B........
pt2[1]= x2/(den - den2);
pt2[0]= y2/(den - den2);
pt2[2]= z2/(den - den2);
ncross = cross(pt2-pt1, pt3-pt1);
_vertices.push_back(pt1);
_vertices.push_back(pt3);
_vertices.push_back(pt2);
_normals.push_back(ncross);
//_colors += Vector3(_colorArray[ci%11][0],_colorArray[ci%11][1],_colorArray[ci%11][2]);
_colors.push_back(Vector3(_colorArray[ci][0],_colorArray[ci][1],_colorArray[ci][2]));
// Finished with the first triangle..................
// Triangle BCD ..............................
// Point C
pt2[1]= x3/(den - den3);
pt2[0]= y3/(den - den3);
pt2[2]= z3/(den - den3);
// Point B
pt1[1]= x2/(den - den2);
pt1[0]= y2/(den - den2);
pt1[2]= z2/(den - den2);
// Point D
pt3[1]= x4/(den - den4);
pt3[0]= y4/(den - den4);
pt3[2]= z4/(den - den4);
ncross = cross(pt2-pt1, pt3-pt1);
_vertices.push_back(pt1);
_vertices.push_back(pt3);
_vertices.push_back(pt2);
_normals.push_back(ncross);
//_colors += Vector3(_colorArray[ci%11][0],_colorArray[ci%11][1],_colorArray[ci%11][2]);
_colors.push_back(Vector3(_colorArray[ci][0],_colorArray[ci][1],_colorArray[ci][2]));
// Finished with the second triangle..................
}//_stacks loop
} // j%2 planes..
}//_slices loop
}
void Torus::draw() {
int numTriangles = _normals.size();
assert(numTriangles == _colors.size());
assert(numTriangles*3 == _vertices.size());
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
// glMultMatrixd(MathTranslate::instance()->ROOM_TO_WORLD().invert().matrix());
//glMultMatrixd(MathTranslate::instance()->WORLD_TO_ROOM().matrix());
// std::cerr << "Torus.cpp: VRG3D version of glMultMatrixd(MathTranslate::instance()->WORLD_TO_ROOM().matrix()) not implemented.." << std::endl;
glBegin(GL_TRIANGLES);
int j = 0;
for (int i=0; i<numTriangles; i++) {
glColor3f(_colors[i][0],_colors[i][1],_colors[i][2]);
glNormal3f(_normals[i][0],_normals[i][1],_normals[i][2]);
glVertex3f(_vertices[j][0], _vertices[j][1], _vertices[j][2]);
glVertex3f(_vertices[j+1][0], _vertices[j+1][1], _vertices[j+1][2]);
glVertex3f(_vertices[j+2][0], _vertices[j+2][1], _vertices[j+2][2]);
j = j+3;
}
glEnd();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
}