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#include "graphview.h"
#include <QMouseEvent>
#include <QApplication>
GraphView::GraphView(QWidget* parent) :
QWidget(parent),
m_viewLeft(0),
m_viewRight(0),
m_viewBottom(0),
m_viewTop(0),
m_graphLeft(0),
m_graphRight(0),
m_graphBottom(0),
m_graphTop(0),
m_viewWidth(0),
m_viewWidthMin(0),
m_viewWidthMax(0),
m_viewHeight(0),
m_viewHeightMin(0),
m_viewHeightMax(0),
m_selectionState(NULL)
{
memset(&m_previous, -1, sizeof(m_previous));
}
void GraphView::update()
{
if (m_graphLeft != m_previous.m_graphLeft || m_graphRight != m_previous.m_graphRight) {
m_previous.m_graphLeft = m_graphLeft;
m_previous.m_graphRight = m_graphRight;
emit horizontalRangeChanged(m_graphLeft, m_graphRight);
}
if (m_viewLeft != m_previous.m_viewLeft || m_viewRight != m_previous.m_viewRight) {
m_previous.m_viewLeft = m_viewLeft;
m_previous.m_viewRight = m_viewRight;
emit horizontalViewChanged(m_viewLeft, m_viewRight);
}
if (m_graphBottom != m_previous.m_graphBottom || m_graphTop != m_previous.m_graphTop) {
m_previous.m_graphBottom = m_graphBottom;
m_previous.m_graphTop = m_graphTop;
emit verticalRangeChanged(m_graphBottom, m_graphTop);
}
if (m_viewBottom != m_previous.m_viewBottom || m_viewTop != m_previous.m_viewTop) {
m_previous.m_viewBottom = m_viewBottom;
m_previous.m_viewTop = m_viewTop;
emit verticalViewChanged(m_viewBottom, m_viewTop);
}
QWidget::update();
}
void GraphView::resizeEvent(QResizeEvent *)
{
m_viewHeight = height();
m_viewHeightMin = m_viewHeight;
m_viewHeightMax = m_viewHeight;
m_viewTop = m_viewBottom + m_viewHeight;
update();
}
void GraphView::wheelEvent(QWheelEvent *e)
{
int zoomPercent = 10;
/* If holding Ctrl key then zoom 2x faster */
if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
zoomPercent = 20;
}
/* Zoom view by adjusting width */
double dt = m_viewWidth;
double size = dt;
size *= -e->delta();
/* Zoom deltas normally come in increments of 120 */
size /= 120 * (100 / zoomPercent);
m_viewWidth += size;
m_viewWidth = qBound(m_viewWidthMin, m_viewWidth, m_viewWidthMax);
/* Scroll view to zoom around mouse */
dt -= m_viewWidth;
dt *= e->x();
dt /= width();
m_viewLeft = dt + m_viewLeft;
m_viewLeft = qBound(m_graphLeft, m_viewLeft, m_graphRight - m_viewWidth);
m_viewRight = m_viewLeft + m_viewWidth;
update();
}
void GraphView::mouseMoveEvent(QMouseEvent *e)
{
if (e->buttons().testFlag(Qt::LeftButton)) {
/* Horizontal scroll */
double dvdx = m_viewWidth / (double)width();
dvdx *= m_mousePressPosition.x() - e->pos().x();
m_viewLeft = m_mousePressViewLeft + dvdx;
m_viewLeft = qBound(m_graphLeft, m_viewLeft, m_graphRight - m_viewWidth);
m_viewRight = m_viewLeft + m_viewWidth;
/* Vertical scroll */
double dvdy = m_viewHeight / (double)height();
dvdy *= m_mousePressPosition.y() - e->pos().y();
m_viewBottom = m_mousePressViewBottom + dvdy;
m_viewBottom = qBound(m_graphBottom, m_viewBottom, m_graphTop - m_viewHeight);
m_viewTop = m_viewBottom + m_viewHeight;
update();
}
}
void GraphView::mousePressEvent(QMouseEvent *e)
{
m_mousePressPosition = e->pos();
m_mousePressViewLeft = m_viewLeft;
m_mousePressViewBottom = m_viewBottom;
}
void GraphView::mouseDoubleClickEvent(QMouseEvent *e)
{
if (m_selectionState) {
m_selectionState->type = SelectionState::None;
emit selectionChanged();
}
}
void GraphView::setSelectionState(SelectionState* state)
{
m_selectionState = state;
}
void GraphView::setHorizontalView(qint64 start, qint64 end)
{
m_viewLeft = qBound(m_graphLeft, start, m_graphRight - (end - start));
m_viewRight = qBound(m_graphLeft, end, m_graphRight);
m_viewWidth = m_viewRight - m_viewLeft;
update();
}
void GraphView::setVerticalView(qint64 start, qint64 end)
{
m_viewBottom = qBound(m_graphBottom, start, m_graphTop - (end - start));
m_viewTop = qBound(m_graphBottom, end, m_graphTop);
m_viewHeight = m_viewTop - m_viewBottom;
update();
}
void GraphView::setDefaultView(qint64 min, qint64 max)
{
m_graphLeft = min;
m_graphRight = max;
m_viewWidth = max - min;
m_viewWidthMin = 1;
m_viewWidthMax = m_viewWidth;
m_viewLeft = min;
m_viewRight = max;
m_viewHeight = height();
m_viewHeightMin = m_viewHeight;
m_viewHeightMax = m_viewHeight;
m_viewBottom = 0;
m_viewTop = m_viewHeight;
m_graphBottom = 0;
m_graphTop = m_viewHeight;
update();
}
#include "graphview.moc"
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