Graphics.cpp

#include "src/Graphics.h"

Graphics::Graphics() : _initialized(false)
{
}

void Graphics::initialize(std::string type)
{
    //Add functionality to create different shapes with if statement
    if(!_initialized)
    {
        if(type == "circle" || type == "Circle" || type == "CIRCLE")
            createCircle(_verts,_norms);
        else
            createCircle(_verts,_norms);
        //_verts.push_back(0.0f);     _verts.push_back(0.0f);     _verts.push_back(0.0f);
        //_verts.push_back(1.0f);     _verts.push_back(0.0f);     _verts.push_back(0.0f);
        //_verts.push_back(0.5f);     _verts.push_back(1.0f);     _verts.push_back(0.0f);
    }
    _initialized = true;
}

void Graphics::drawSphere()
{
    float xx, yy, zz;
    float xxp, yyp, zzp;
    for(float angle2 = -3.1416f/2.0f; angle2 <= 3.1416f/2.0f; angle2 += RESOL)
    {
        glBegin(GL_TRIANGLE_STRIP);
        glLoadIdentity();
        for(float angle1 = 0.0f; angle1 <= 3.1416f*2.0f; angle1 += RESOL)
        {
            xx = cos(angle1)*cos(angle2);
            yy = sin(angle2);
            zz = sin(angle1)*cos(angle2);

            xxp = cos(angle1)*cos(angle2 + RESOL);
            yyp = sin(angle2 +RESOL);
            zzp = sin(angle1)*cos(angle2 + RESOL);

            glNormal3d(0, 0, 1);
            glVertex3f(xx, yy, zz);
            glVertex3f(xxp, yyp, zzp);
        }
        glEnd();
    }
}

void Graphics::createCircle(std::vector<float>& verts,std::vector<float>& norms)
{
    float xx, yy, zz;
    float xxp,yyp,zzp;
    Vector3f n;
    Vector3f trans;

    for(float angle2 = -3.1416f; angle2 <= 3.1416f; angle2 += RESOL)
    {
        for(float angle1 = 0.0f; angle1 <= 3.1416f*2.0f; angle1 += RESOL)
        {
            xx = cos(angle1)*cos(angle2);
            yy = sin(angle2);
            zz = sin(angle1)*cos(angle2);

            xxp = cos(angle1)*cos(angle2 + RESOL);
            yyp = sin(angle2 +RESOL);
            zzp = sin(angle1)*cos(angle2 + RESOL);

            // xx = sin(angle2)*cos(angle1);
            // yy = sin(angle2)*sin(angle1);
            // zz = cos(angle2);
            verts.push_back(xx);            verts.push_back(yy);            verts.push_back(zz);
            n = Vector3f(xx,yy,zz);

            n.normalize();
            norms.push_back(n.x);           norms.push_back(n.y);           norms.push_back(n.z);

            verts.push_back(xxp);            verts.push_back(yyp);            verts.push_back(zzp);
            n = Vector3f(xxp,yyp,zzp);
            n.normalize();
            norms.push_back(n.x);           norms.push_back(n.y);           norms.push_back(n.z);


        }
    }
}