Image Component Library

#include <Cylinder.h>

CylinderObject::CylinderObject() {

  setTransformation(Mat::id());

}

void CylinderObject::setupGeometry(int _steps) {

  steps = _steps;

  m_lineColorsFromVertices = true;

  m_triangleColorsFromVertices = true;

  m_quadColorsFromVertices = true;

  m_polyColorsFromVertices = true;

  m_primitives.clear();

  m_vertices.clear();

  m_vertexColors.clear();

  m_normals.clear();

  for( int i = 0; i < steps; i++ ) {

    int upper_center_vertex = 0;

    int lower_center_vertex = 2*steps+1;

    int upper_a_vertex = i*2+1;

    int lower_a_vertex = i*2+2;

    int upper_b_vertex = i*2+3;

    int lower_b_vertex = i*2+4;

    int upper_center_normal = 0;

    int lower_center_normal = 3*steps+1;

    int upper_a_normal = i*3+1;

    int lower_a_normal = i*3+2;

    int radius_a_normal = i*3+3;

    int upper_b_normal = i*3+4;

    int lower_b_normal = i*3+5;

    int radius_b_normal = i*3+6;

    if( i == steps-1 ) {

      upper_b_vertex = 1;

      lower_b_vertex = 2;

      upper_b_normal = 1;

      lower_b_normal = 2;

      radius_b_normal = 3;      

    }

    addTriangle(upper_center_vertex, upper_a_vertex, upper_b_vertex,

                upper_center_normal, upper_a_normal, upper_b_normal,

                GeomColor(0,100,200,255));

    addLine(upper_a_vertex, upper_b_vertex, GeomColor(0,100,200,255));

    addQuad(upper_a_vertex, lower_a_vertex, lower_b_vertex, upper_b_vertex,

            radius_a_normal, radius_a_normal, radius_b_normal, radius_b_normal,

            GeomColor(0,100,200,255));

    addLine(upper_a_vertex, lower_a_vertex, GeomColor(0,100,200,255));

    addTriangle(lower_center_vertex, lower_b_vertex, lower_a_vertex,

                lower_center_normal, lower_b_normal, lower_a_normal,

                GeomColor(0,100,200,255));

    addLine(lower_a_vertex, lower_b_vertex, GeomColor(0,100,200,255));

  }

  m_vertices.resize(2*steps+2, Vec(0.0, 0.0, 0.0, 1.0));

  m_vertexColors.resize(2*steps+2, GeomColor(0, 100, 200, 200));

  m_normals.resize(3*steps+2, Vec(0.0, 0.0, 0.0, 1.0));

}

void CylinderObject::updateGeometry(float height, float radius, GeomColor color) {

  float da = (2*M_PI)/steps;

  height = fabs(height);

  m_vertices[0][0] = 0.0;

  m_vertices[0][1] = 0.0;

  m_vertices[0][2] = height/2;

  m_vertexColors[0][0] = color[0] / 255.0;

  m_vertexColors[0][1] = color[1] / 255.0;

  m_vertexColors[0][2] = color[2] / 255.0;

  m_vertexColors[0][3] = color[3] / 255.0;

  m_normals[0][0] = 0.0;

  m_normals[0][1] = 0.0;

  m_normals[0][2] = 1.0;

  for(int i=0;i<steps;++i){

    float a = i*da;

    float cx = radius*cos(a);

    float cy = radius*sin(a);

    m_vertices[i*2+1][0] = cx;

    m_vertices[i*2+1][1] = cy;

    m_vertices[i*2+1][2] = height/2;

    m_vertices[i*2+2][0] = cx;

    m_vertices[i*2+2][1] = cy;

    m_vertices[i*2+2][2] = -height/2;

    m_vertexColors[i*2+1][0] = color[0] / 255.0;

    m_vertexColors[i*2+1][1] = color[1] / 255.0;

    m_vertexColors[i*2+1][2] = color[2] / 255.0;

    m_vertexColors[i*2+1][3] = color[3] / 255.0;

    m_vertexColors[i*2+2][0] = color[0] / 255.0;

    m_vertexColors[i*2+2][1] = color[1] / 255.0;

    m_vertexColors[i*2+2][2] = color[2] / 255.0;

    m_vertexColors[i*2+2][3] = color[3] / 255.0;

    m_normals[i*3+1][0] = 0.0;

    m_normals[i*3+1][1] = 0.0;

    m_normals[i*3+1][2] = 1.0;

    m_normals[i*3+2][0] = 0.0;

    m_normals[i*3+2][1] = 0.0;

    m_normals[i*3+2][2] = -1.0;

    m_normals[i*3+3][0] = cx / sqrt(cx*cx + cy*cy);

    m_normals[i*3+3][1] = cy / sqrt(cx*cx + cy*cy);

    m_normals[i*3+3][2] = 0.0;

    m_normals[i*3+3][3] = 1.0;

  }

  m_vertices[2*steps+1][0] = 0.0;

  m_vertices[2*steps+1][1] = 0.0;

  m_vertices[2*steps+1][2] = -height/2;

  m_vertexColors[2*steps+1][0] = color[0] / 255.0;

  m_vertexColors[2*steps+1][1] = color[1] / 255.0;

  m_vertexColors[2*steps+1][2] = color[2] / 255.0;

  m_vertexColors[2*steps+1][3] = color[3] / 255.0;

  m_normals[3*steps+1][0] = 0.0;

  m_normals[3*steps+1][1] = 0.0;

  m_normals[3*steps+1][2] = -1.0;

}