common.cpp

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 * $Id: common.cpp 6161 2012-07-05 17:37:29Z rusu $
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#include <pcl/visualization/common/common.h>
#include <stdlib.h>

void
pcl::visualization::getRandomColors (double &r, double &g, double &b, double min, double max)
{
  double sum;
  static unsigned stepRGBA = 100;
  do
  {
    sum = 0;
    r = (rand () % stepRGBA) / static_cast<double> (stepRGBA);
    while ((g = (rand () % stepRGBA) / static_cast<double> (stepRGBA)) == r) {}
    while (((b = (rand () % stepRGBA) / static_cast<double> (stepRGBA)) == r) && (b == g)) {}
    sum = r + g + b;
  }
  while (sum <= min || sum >= max);
}


void
pcl::visualization::Camera::computeViewMatrix(Eigen::Matrix4d& view_mat) const
{
//constructs view matrix from camera pos, view up, and the point it is looking at
//this code is based off of gluLookAt http://www.opengl.org/wiki/GluLookAt_code
        Eigen::Vector3d focal_point (focal[0], focal[1], focal[2]);
        Eigen::Vector3d posv        (pos[0]  , pos[1]  , pos[2]);
        Eigen::Vector3d up          (view[0] , view[1] , view[2]);

        Eigen::Vector3d zAxis = (focal_point - posv).normalized();
  Eigen::Vector3d xAxis = zAxis.cross(up).normalized();
  // make sure the y-axis is orthogonal to the other two
  Eigen::Vector3d yAxis = xAxis.cross (zAxis);

        view_mat.block <1, 3> (0, 0) = xAxis;
        view_mat.block <1, 3> (1, 0) = yAxis;
        view_mat.block <1, 3> (2, 0) = -zAxis;
        view_mat.row (3) << 0, 0, 0, 1;

        view_mat.block <3, 1> (0, 3) = view_mat.topLeftCorner<3, 3> () * (-posv);
}

void
pcl::visualization::Camera::computeProjectionMatrix (Eigen::Matrix4d& proj) const
{
  float top    = static_cast<float> (clip[0]) * tanf (0.5f * static_cast<float> (fovy));
  float left   = -top * static_cast<float> (window_size[0] / window_size[1]);
  float right  = -left;
  float bottom = -top;

  float temp1, temp2, temp3, temp4;
        temp1 = 2.0f * static_cast<float> (clip[0]);
        temp2 = 1.0f / (right - left);
        temp3 = 1.0f / (top - bottom);
        temp4 = 1.0f / static_cast<float> (clip[1] - clip[0]);

  proj.setZero ();

        proj(0,0) = temp1 * temp2;
        proj(1,1) = temp1 * temp3;
        proj(0,2) = (right + left) * temp2;
        proj(1,2) = (top + bottom) * temp3;
        proj(2,2) = (-clip[1] - clip[0]) * temp4;
        proj(3,2) = -1.0;
        proj(2,3) = (-temp1 * clip[1]) * temp4;
}