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VHistoWidget.cpp
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#include <QPainter> #include "VHistoWidget.h" #include <iostream> using namespace cv; using namespace std; VHistoWidget::VHistoWidget(int scale, int width, int height, int paletteHeight, QWidget *parent) : QWidget(parent), m_width(width), m_height(height), m_paletteHeight(paletteHeight), m_scale(scale) { setFixedSize(m_width, m_height + m_paletteHeight + 1); } /////////// // slots // /////////// void VHistoWidget::setHisto(const Mat &vHisto) { m_vHisto = vHisto; update(); } void VHistoWidget::setScale(int scale) { m_scale = scale; update(); } void VHistoWidget::paintEvent(QPaintEvent *event) { Q_UNUSED(event); float binWidth = static_cast<float>(m_width) / m_vHisto.rows; QPainter painter(this); painter.fillRect(0, 0, m_width, m_height, QBrush(Qt::white)); float vNormFac = 256.0 / m_vHisto.rows; for (int i = 1; i <= m_vHisto.rows; i++) { QRectF rectangle(QPointF((i-1) * binWidth, m_height * (1 - m_scale * m_vHisto.at<float>(i-1))), QPointF(i * binWidth, m_height)); painter.fillRect(rectangle, QBrush(Qt::black)); QRectF palette(QPointF((i-1) * binWidth, m_height + 1), QPointF(i * binWidth, m_height + 1 + m_paletteHeight)); QColor vLevel(qRound((i-1) * vNormFac), qRound((i-1) * vNormFac), qRound((i-1) * vNormFac)); painter.fillRect(palette, vLevel); } } |