Qt 4.8
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QGraphicsSceneIndexPointIntersector Class Reference
Inheritance diagram for QGraphicsSceneIndexPointIntersector:
QGraphicsSceneIndexIntersector

Public Functions

bool intersect (const QGraphicsItem *item, const QRectF &exposeRect, Qt::ItemSelectionMode mode, const QTransform &deviceTransform) const
 
- Public Functions inherited from QGraphicsSceneIndexIntersector
 QGraphicsSceneIndexIntersector ()
 
virtual ~QGraphicsSceneIndexIntersector ()
 

Public Variables

QPointF scenePoint
 

Detailed Description

Definition at line 126 of file qgraphicssceneindex.cpp.

Functions

◆ intersect()

bool QGraphicsSceneIndexPointIntersector::intersect ( const QGraphicsItem *  item,
const QRectF &  exposeRect,
Qt::ItemSelectionMode  mode,
const QTransform &  deviceTransform 
) const
inlinevirtual

Implements QGraphicsSceneIndexIntersector.

Definition at line 129 of file qgraphicssceneindex.cpp.

131  {
132  QRectF brect = item->boundingRect();
133  _q_adjustRect(&brect);
134 
135  // ### Add test for this (without making things slower?)
136  Q_UNUSED(exposeRect);
137 
138  bool keep = false;
139  const QGraphicsItemPrivate *itemd = QGraphicsItemPrivate::get(item);
140  if (itemd->itemIsUntransformable()) {
141  // Untransformable items; map the scene point to item coordinates.
142  const QTransform transform = item->deviceTransform(deviceTransform);
143  QPointF itemPoint = (deviceTransform * transform.inverted()).map(scenePoint);
144  keep = brect.contains(itemPoint);
145  if (keep && (mode == Qt::ContainsItemShape || mode == Qt::IntersectsItemShape)) {
146  QPainterPath pointPath;
147  pointPath.addRect(QRectF(itemPoint, QSizeF(1, 1)));
148  keep = QGraphicsSceneIndexPrivate::itemCollidesWithPath(item, pointPath, mode);
149  }
150  } else {
151  Q_ASSERT(!itemd->dirtySceneTransform);
152  QRectF sceneBoundingRect = itemd->sceneTransformTranslateOnly
153  ? brect.translated(itemd->sceneTransform.dx(),
154  itemd->sceneTransform.dy())
155  : itemd->sceneTransform.mapRect(brect);
156  keep = sceneBoundingRect.intersects(QRectF(scenePoint, QSizeF(1, 1)));
157  if (keep) {
158  QPointF p = itemd->sceneTransformTranslateOnly
159  ? QPointF(scenePoint.x() - itemd->sceneTransform.dx(),
160  scenePoint.y() - itemd->sceneTransform.dy())
161  : itemd->sceneTransform.inverted().map(scenePoint);
162  keep = item->contains(p);
163  }
164  }
165 
166  return keep;
167  }
QTransform::dy
qreal dy() const
Returns the vertical translation factor.
Definition: qtransform.h:277
QPainterPath
The QPainterPath class provides a container for painting operations, enabling graphical shapes to be ...
Definition: qpainterpath.h:67
QGraphicsItem::boundingRect
virtual QRectF boundingRect() const =0
This pure virtual function defines the outer bounds of the item as a rectangle; all painting must be ...
QPointF
The QPointF class defines a point in the plane using floating point precision.
Definition: qpoint.h:214
QRectF::intersects
bool intersects(const QRectF &r) const
Returns true if this rectangle intersects with the given rectangle (i.
Definition: qrect.cpp:2744
Q_ASSERT
#define Q_ASSERT(cond)
Definition: qglobal.h:1823
QSizeF
The QSizeF class defines the size of a two-dimensional object using floating point precision...
Definition: qsize.h:202
QTransform::inverted
QTransform inverted(bool *invertible=0) const
Returns an inverted copy of this matrix.
Definition: qtransform.cpp:364
QPointF::x
qreal x() const
Returns the x-coordinate of this point.
Definition: qpoint.h:282
QRectF::contains
bool contains(const QPointF &p) const
Returns true if the given point is inside or on the edge of the rectangle; otherwise returns false...
Definition: qrect.cpp:2349
QTransform::mapRect
QRect mapRect(const QRect &) const
Creates and returns a QRect object that is a copy of the given rectangle, mapped into the coordinate ...
Definition: qtransform.cpp:1920
_q_adjustRect
static void _q_adjustRect(QRect *rect)
Definition: qgraphicsitem.cpp:794
QtConcurrent::map
QFuture< void > map(Sequence &sequence, MapFunction function)
QRectF
The QRectF class defines a rectangle in the plane using floating point precision. ...
Definition: qrect.h:511
QGraphicsItemPrivate::itemIsUntransformable
bool itemIsUntransformable() const
Definition: qgraphicsitem_p.h:266
QGraphicsItemPrivate::sceneTransformTranslateOnly
quint32 sceneTransformTranslateOnly
Definition: qgraphicsitem_p.h:573
QTransform::map
QPoint map(const QPoint &p) const
Creates and returns a QPoint object that is a copy of the given point, mapped into the coordinate sys...
Definition: qtransform.cpp:1154
QPainterPath::addRect
void addRect(const QRectF &rect)
Adds the given rectangle to this path as a closed subpath.
Definition: qpainterpath.cpp:1085
QGraphicsItem::deviceTransform
QTransform deviceTransform(const QTransform &viewportTransform) const
Returns this item&#39;s device transformation matrix, using viewportTransform to map from scene to device...
Definition: qgraphicsitem.cpp:4463
QGraphicsItem::contains
virtual bool contains(const QPointF &point) const
Returns true if this item contains point, which is in local coordinates; otherwise, false is returned.
Definition: qgraphicsitem.cpp:5273
QTransform::dx
qreal dx() const
Returns the horizontal translation factor.
Definition: qtransform.h:273
QGraphicsItemPrivate::get
static const QGraphicsItemPrivate * get(const QGraphicsItem *item)
Definition: qgraphicsitem_p.h:250
QPointF::y
qreal y() const
Returns the y-coordinate of this point.
Definition: qpoint.h:287
QRectF::translated
QRectF translated(qreal dx, qreal dy) const
Returns a copy of the rectangle that is translated dx along the x axis and dy along the y axis...
Definition: qrect.h:740
Q_UNUSED
#define Q_UNUSED(x)
Indicates to the compiler that the parameter with the specified name is not used in the body of a fun...
Definition: qglobal.h:1729
QTransform
The QTransform class specifies 2D transformations of a coordinate system.
Definition: qtransform.h:65
QGraphicsSceneIndexPrivate::itemCollidesWithPath
static bool itemCollidesWithPath(const QGraphicsItem *item, const QPainterPath &path, Qt::ItemSelectionMode mode)
Checks if item collides with the path and mode, but also checks that if it doesn&#39;t collide...
Definition: qgraphicssceneindex.cpp:249

Properties

◆ scenePoint

QPointF QGraphicsSceneIndexPointIntersector::scenePoint

Definition at line 169 of file qgraphicssceneindex.cpp.

The documentation for this class was generated from the following file:
Qt 4.8 Source Code Browser