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Profile: attempt on better zoom and pan logic
QGraphicsView::AnchorUnderMouse does not work for Qt 4.8.1 on Ubuntu 12.04 and if the mouseMoveEvent overload is disabled it practically can be seen that the anchor point is [0, 0] instead of the mouse location. After a suggestion found on the web this patch attempts to use the hidden scroll bars to calculate reposition on pan and zoom *near the mouse cursor. On the other hand QAbstactSlider (QScrollBar) class strangly uses negative offsets for minimum scroll position, which makes the implementation even more ugly. [*near] because it's not that accurate! Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com> Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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2 changed files with 25 additions and 5 deletions
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@ -6,6 +6,7 @@
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#include <QGraphicsScene>
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#include <QResizeEvent>
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#include <QGraphicsLineItem>
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#include <QScrollBar>
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#include <QPen>
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#include <QBrush>
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#include <QDebug>
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@ -67,12 +68,32 @@ ProfileGraphicsView::ProfileGraphicsView(QWidget* parent) : QGraphicsView(parent
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}
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/* since we cannot use translate() directly on the scene we hack on
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* the scroll bars (hidden) functionality */
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void ProfileGraphicsView::scrollViewTo(const QPoint pos)
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{
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if (!zoomLevel)
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return;
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QScrollBar *vs = verticalScrollBar();
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QScrollBar *hs = horizontalScrollBar();
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const qreal yRat = pos.y() / sceneRect().height();
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const qreal xRat = pos.x() / sceneRect().width();
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const int vMax = vs->maximum();
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const int hMax = hs->maximum();
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const int vMin = vs->minimum();
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const int hMin = hs->minimum();
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/* QScrollBar receives crazy negative values for minimum */
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vs->setValue(yRat * (vMax - vMin) + vMin * 0.9);
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hs->setValue(xRat * (hMax - hMin) + hMin * 0.9);
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}
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void ProfileGraphicsView::wheelEvent(QWheelEvent* event)
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{
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if (!toolTip)
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return;
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setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
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// doesn't seem to work for Qt 4.8.1
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// setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
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// Scale the view / do the zoom
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QPoint toolTipPos = mapFromScene(toolTip->pos());
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@ -86,6 +107,7 @@ void ProfileGraphicsView::wheelEvent(QWheelEvent* event)
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scale(1.0 / scaleFactor, 1.0 / scaleFactor);
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zoomLevel--;
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}
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scrollViewTo(event->pos());
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toolTip->setPos(mapToScene(toolTipPos).x(), mapToScene(toolTipPos).y());
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}
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@ -98,10 +120,7 @@ void ProfileGraphicsView::mouseMoveEvent(QMouseEvent* event)
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QPoint toolTipPos = mapFromScene(toolTip->pos());
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double dx = sceneRect().x();
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double dy = sceneRect().y();
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ensureVisible(event->pos().x() + dx, event->pos().y() + dy, 1, 1);
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scrollViewTo(event->pos());
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if (zoomLevel == 0)
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QGraphicsView::mouseMoveEvent(event);
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@ -124,6 +124,7 @@ private:
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void plot_depth_scale();
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QColor get_sac_color(int sac, int avg_sac);
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void scrollViewTo(const QPoint pos);
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QPen defaultPen;
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QBrush defaultBrush;
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