void OpenGLInterface::printHistogram(Histogram &histogram, FigureRectangle rectangle) {
/* Put coursor back to (0, 0, 0) */
glLoadIdentity();
int numberOfBins = histogram.getNumberOfArguments();
int numberOfCharts = histogram.getNumberOfCharts();
double binWidth = 1 / double(numberOfBins);
drawArgumentLabels(histogram.getMinArgument(), histogram.getMaxArgument(), 4, rectangle);
drawValueLabels(histogram.getMinValue(), histogram.getMaxValue(), 4, rectangle);
rectangle.resize(0.93, 0.93);
glEnable(GL_ALPHA_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_DST_ALPHA);
double leftDownX = rectangle.getMiddleX() - rectangle.getSizeX() / 2;
double leftDownY = rectangle.getMiddleY() - rectangle.getSizeY() / 2;
double sizeX = rectangle.getSizeX();
double sizeY = rectangle.getSizeY();
double sideGap = configurator->getSideGap();
for(int j = 0; j < numberOfCharts; j++) {
FigureRectangle histogramColumn;
Color color = histogram.getColor(j);
histogramColumn.setColor(color);
for(int i = 0; i < numberOfBins; i++) {
histogramColumn.setFigure(leftDownX + i * binWidth * sizeX, leftDownY, leftDownX + ((i + 1) * binWidth - binWidth * sideGap) * sizeX, leftDownY + histogram.getValue(j, i) / histogram.getMaxValue() * sizeY);
drawRectangle(histogramColumn);
}
}
glDisable(GL_BLEND);
glDisable(GL_ALPHA_TEST);
}
