--- /dev/null
+#include "histogramview.h"
+
+#include <QPen>
+#include <QBrush>
+#include <qmath.h>
+#include <QPainter>
+#include <QToolTip>
+#include <QMouseEvent>
+
+HistogramView::HistogramView(QWidget* parent) :
+ GraphView(parent),
+ m_data(NULL)
+{
+ setMouseTracking(true);
+
+ m_gradientUnselected.setColorAt(0.9, QColor(200, 200, 200));
+ m_gradientUnselected.setColorAt(0.0, QColor(220, 220, 220));
+
+ m_gradientSelected.setColorAt(0.9, QColor(0, 0, 210));
+ m_gradientSelected.setColorAt(0.0, QColor(130, 130, 255));
+}
+
+
+void HistogramView::setDataProvider(GraphDataProvider* data)
+{
+ delete m_data;
+ m_data = data;
+
+ if (m_data) {
+ m_data->setSelectionState(m_selectionState);
+ setDefaultView(0, m_data->size());
+ m_viewWidthMin = 10;
+ } else {
+ setDefaultView(0, 0);
+ }
+}
+
+
+void HistogramView::setSelectionState(SelectionState* state)
+{
+ if (m_data) {
+ m_data->setSelectionState(state);
+ }
+
+ GraphView::setSelectionState(state);
+}
+
+
+void HistogramView::setSelectedGradient(const QLinearGradient& gradient)
+{
+ m_gradientSelected = gradient;
+}
+
+
+void HistogramView::setUnelectedGradient(const QLinearGradient& gradient)
+{
+ m_gradientUnselected = gradient;
+}
+
+
+void HistogramView::mouseMoveEvent(QMouseEvent *e)
+{
+ GraphView::mouseMoveEvent(e);
+
+ if (e->buttons() || !m_data) {
+ QToolTip::hideText();
+ return;
+ }
+
+ qint64 index = itemAtPosition(e->pos());
+ qint64 time = valueAtPosition(e->pos());
+
+ if (m_data->value(index) >= time) {
+ QToolTip::showText(e->globalPos(), m_data->itemTooltip(index));
+ } else {
+ QToolTip::hideText();
+ }
+}
+
+
+void HistogramView::mouseDoubleClickEvent(QMouseEvent *e)
+{
+ if (e->button() == Qt::LeftButton) {
+ qint64 index = itemAtPosition(e->pos());
+ qint64 time = valueAtPosition(e->pos());
+
+ if (m_data->value(index) >= time) {
+ m_data->itemDoubleClicked(index);
+ return;
+ }
+ }
+
+ GraphView::mouseDoubleClickEvent(e);
+}
+
+
+void HistogramView::update()
+{
+ m_graphBottom = 0;
+ m_graphTop = 0;
+
+ if (m_data) {
+ for (qint64 i = m_viewLeft; i < m_viewRight; ++i) {
+ qint64 value = m_data->value(i);
+
+ if (value > m_graphTop) {
+ m_graphTop = value;
+ }
+ }
+ }
+
+ GraphView::update();
+}
+
+
+void HistogramView::resizeEvent(QResizeEvent *)
+{
+ m_gradientSelected.setStart(0, height());
+ m_gradientUnselected.setStart(0, height());
+}
+
+
+/* Draw the histogram
+ *
+ * When the view is zoomed such that there is more than one item occupying a single pixel
+ * the one with the highest value will be displayed.
+ */
+void HistogramView::paintEvent(QPaintEvent *)
+{
+ if (!m_data) {
+ return;
+ }
+
+ QBrush selectedBrush = QBrush(m_gradientSelected);
+ QPen selectedPen = QPen(selectedBrush, 1);
+
+ QBrush unselectedBrush = QBrush(m_gradientUnselected);
+ QPen unselectedPen = QPen(unselectedBrush, 1);
+
+ QPainter painter(this);
+ painter.fillRect(0, 0, width(), height(), Qt::white);
+
+ double dydv = height() / (double)m_graphTop;
+ double dxdv = width() / (double)(m_viewRight - m_viewLeft);
+ bool selection = m_selectionState && m_selectionState->type != SelectionState::None;
+
+ if (dxdv < 1.0) {
+ /* Less than one pixel per item */
+ qint64 longestValue = m_graphBottom;
+ qint64 longestSelected = m_graphBottom;
+ int lastX = 0;
+ double x = 0;
+
+ if (selection) {
+ painter.setPen(unselectedPen);
+ } else {
+ painter.setPen(selectedPen);
+ }
+
+ for (qint64 i = m_viewLeft; i < m_viewRight; ++i) {
+ qint64 value = m_data->value(i);
+ int ix;
+
+ if (value > longestValue) {
+ longestValue = value;
+ }
+
+ if (selection && m_data->selected(i) && value > longestSelected) {
+ longestSelected = value;
+ }
+
+ x += dxdv;
+ ix = (int)x;
+
+ if (lastX != ix) {
+ painter.drawLine(lastX, height(), lastX, height() - (longestValue * dydv));
+
+ if (selection && longestSelected > m_graphBottom) {
+ painter.setPen(selectedPen);
+ painter.drawLine(lastX, height(), lastX, height() - (longestSelected * dydv));
+ painter.setPen(unselectedPen);
+ longestSelected = m_graphBottom;
+ }
+
+ longestValue = m_graphBottom;
+ lastX = ix;
+ }
+ }
+ } else {
+ /* Draw rectangles for graph */
+ double x = 0;
+
+ for (qint64 i = m_viewLeft; i < m_viewRight; ++i, x += dxdv) {
+ qint64 value = m_data->value(i);
+ int y = qMax<int>(1, value * dydv);
+
+ if (!selection || m_data->selected(i)) {
+ painter.fillRect(x, height() - y, dxdv, y, selectedBrush);
+ } else {
+ painter.fillRect(x, height() - y, dxdv, y, unselectedBrush);
+ }
+ }
+ }
+
+ /* Draw the borders for the selection */
+ if (m_selectionState && m_selectionState->type == SelectionState::Horizontal) {
+ double dxdt = width() / (double)m_viewWidth;
+ double scroll = m_viewLeft * dxdt;
+ double left = (m_selectionState->start * dxdt) - scroll;
+ double right = (m_selectionState->end * dxdt) - scroll;
+
+ painter.setPen(Qt::green);
+
+ if (left >= 0 && left <= width()) {
+ painter.drawLine(left, 0, left, height());
+ }
+
+ if (right >= 0 && right <= width()) {
+ painter.drawLine(right, 0, right, height());
+ }
+ }
+}
+
+
+/* Find the item with the highest value at pos.x() +/- 1,
+ * the mouse must be within the bar height-wise.
+ */
+qint64 HistogramView::itemAtPosition(QPoint pos) {
+ double dvdx = m_viewWidth / (double)width();
+
+ qint64 left = qFloor(dvdx) * (pos.x() - 1) + m_viewLeft;
+ qint64 right = qCeil(dvdx) * (pos.x() + 1) + m_viewLeft;
+
+ qint64 longestIndex = 0;
+ qint64 longestValue = 0;
+
+ left = qBound<qint64>(0, left, m_data->size() - 1);
+ right = qBound<qint64>(0, right, m_data->size() - 1);
+
+ for (qint64 i = left; i <= right; ++i) {
+ if (m_data->value(i) > longestValue) {
+ longestValue = m_data->value(i);
+ longestIndex = i;
+ }
+ }
+
+ return longestIndex;
+}
+
+
+/* Return the value at position */
+qint64 HistogramView::valueAtPosition(QPoint pos) {
+ double value = m_graphTop / (double)height();
+ value *= height() - pos.y();
+ value += m_graphBottom;
+ return (qint64)value;
+}
+
projects / apitrace / blobdiff