/**
* Replace vector null values by average (better for histogram display)
* @param v vector to modify
*/
void OverlayData::correctVector( HistogramVector& v ) const
{
for(unsigned int i=1; i<v.size()-1;++i)
{
if(v.at(i) < 0.05)
v.at(i) = (Number)((v.at(i-1)+v.at(i+1))/2.0);//basic average
}
}
/**
* display selection points under the histograms
* @param selection_v buffer which contains all of the selection points
* @param step step for display
* @param width width of the source clip
* @param color color using for display
*/
void displaySelectionPoints(const HistogramVector& selection_v, const double step, const double width, const HistogramColor color)
{
glBegin( GL_POINTS );
double base_step = 0.0;
glColor3f(color._colorBorder.r, color._colorBorder.g, color._colorBorder.b);
for(unsigned int i=0; i<selection_v.size(); ++i)
{
if(selection_v.at(i) != 0)
{
glVertex2f((float)(base_step), -10.0f);
}
base_step += step;
}
glEnd();
}
/**
* Compute a specific channel average
* @param selection_v vector which contain the selection histogram
* @return
*/
int OverlayData::computeAnAverage( const HistogramVector& selection_v ) const
{
int av = 0;
int size = 0;
for( std::size_t i=0; i < selection_v.size(); ++i)
{
if(selection_v.at(i)!=0)
{
av+=selection_v.at(i)*i;
size+=selection_v.at(i);
}
}
if(size != 0) //avoid 0 division
av /=size;
return av; //basic average
}
/**
* Display the given vector on screen (only border)
* @param v specific vector to display on overlay
* @param step step of the display
* @param height maximal height
* @param width maximal width
* @param color color used to display
*/
void displayASpecificHistogramBorder(const HistogramVector& v, const double step, const double height, const double width, const HistogramColor color)
{
//Draw the border line
glBegin( GL_LINE_STRIP );
//maximum data in the current channel vector
const Number max_value = *(std::max_element(v.begin(),v.end()));
const float ratio = height/max_value;
double base_step = 0.0;
glColor3f(color._colorBorder.r, color._colorBorder.g, color._colorBorder.b);
for(unsigned int i=0; i<v.size(); ++i)
{
const float value = (float)(v.at(i)*ratio);
glVertex2f((float)(base_step), float(value));
base_step += step;
}
glEnd();
}
/**
* Display the given vector on screen
* @param v specific vector to display on overlay
* @param step step of the display
* @param height maximal height
* @param width maximal width
* @param color color used to display
*/
void displayASpecificHistogram(const HistogramVector& v,const HistogramVector& selection_v, const double step, const double height, const double width, const HistogramColor color,float selectionMultiplier)
{
if(v.size())
{
//maximum data in the current channel vector
const Number max_value = *(std::max_element(v.begin(),v.end()));
const float ratio = height/max_value;
//OpenGL 2.X
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE); //additive blending active
glColor3f(color._colorFill.r, color._colorFill.g, color._colorFill.b);
//Display option
glBegin( GL_QUAD_STRIP );
double base_step = 0.0;//first point
for(unsigned int i=0; i<v.size(); ++i)
{
const float value = (float)(v.at(i)*ratio);
float selection_value = (float)(selection_v.at(i)*ratio);
selection_value*= selectionMultiplier;
if(selection_value > value) //if selection value is bigger than normal value replace it
selection_value = value;
glVertex2f((float)(base_step), (float)(value));
glVertex2f((float)(base_step), (float)(selection_value));
base_step += step;
}
glVertex2f((float)width,0.0f);//last point
glEnd();
glDisable(GL_BLEND);
}
}
/**
* @brief Set each values of the vector to null
* @param v vector to reset
* @param numberOfStep number of step (size of the vector)
*/
void OverlayData::resetVectortoZero( HistogramVector& v, const std::size_t numberOfStep ) const
{
v.assign(numberOfStep,0);
}