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-rw-r--r--examples/graphicsview/dragdroprobot/coloritem.cpp24
-rw-r--r--examples/graphicsview/dragdroprobot/coloritem.h2
-rw-r--r--examples/graphicsview/dragdroprobot/main.cpp8
-rw-r--r--examples/graphicsview/dragdroprobot/robot.cpp217
-rw-r--r--examples/graphicsview/dragdroprobot/robot.h29
-rw-r--r--examples/graphicsview/elasticnodes/edge.cpp30
-rw-r--r--examples/graphicsview/elasticnodes/edge.h6
-rw-r--r--examples/graphicsview/elasticnodes/graphwidget.cpp34
-rw-r--r--examples/graphicsview/elasticnodes/graphwidget.h4
-rw-r--r--examples/graphicsview/elasticnodes/node.cpp46
-rw-r--r--examples/graphicsview/elasticnodes/node.h2
11 files changed, 252 insertions, 150 deletions
diff --git a/examples/graphicsview/dragdroprobot/coloritem.cpp b/examples/graphicsview/dragdroprobot/coloritem.cpp
index 95878b1..08edd38 100644
--- a/examples/graphicsview/dragdroprobot/coloritem.cpp
+++ b/examples/graphicsview/dragdroprobot/coloritem.cpp
@@ -43,6 +43,7 @@
#include "coloritem.h"
+//! [0]
ColorItem::ColorItem()
: color(qrand() % 256, qrand() % 256, qrand() % 256)
{
@@ -50,13 +51,18 @@ ColorItem::ColorItem()
.arg(color.red()).arg(color.green()).arg(color.blue())
.arg("Click and drag this color onto the robot!"));
setCursor(Qt::OpenHandCursor);
+ setAcceptedMouseButtons(Qt::LeftButton);
}
+//! [0]
+//! [1]
QRectF ColorItem::boundingRect() const
{
return QRectF(-15.5, -15.5, 34, 34);
}
+//! [1]
+//! [2]
void ColorItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
Q_UNUSED(option);
@@ -68,17 +74,16 @@ void ColorItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
painter->setBrush(QBrush(color));
painter->drawEllipse(-15, -15, 30, 30);
}
+//! [2]
+//! [3]
void ColorItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
- if (event->button() != Qt::LeftButton) {
- event->ignore();
- return;
- }
-
setCursor(Qt::ClosedHandCursor);
}
+//! [3]
+//! [5]
void ColorItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
if (QLineF(event->screenPos(), event->buttonDownScreenPos(Qt::LeftButton))
@@ -89,7 +94,9 @@ void ColorItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
QDrag *drag = new QDrag(event->widget());
QMimeData *mime = new QMimeData;
drag->setMimeData(mime);
+//! [5]
+//! [6]
static int n = 0;
if (n++ > 2 && (qrand() % 3) == 0) {
QImage image(":/images/head.png");
@@ -97,6 +104,8 @@ void ColorItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
drag->setPixmap(QPixmap::fromImage(image).scaled(30, 40));
drag->setHotSpot(QPoint(15, 30));
+//! [6]
+//! [7]
} else {
mime->setColorData(color);
mime->setText(QString("#%1%2%3")
@@ -118,12 +127,17 @@ void ColorItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
drag->setPixmap(pixmap);
drag->setHotSpot(QPoint(15, 20));
}
+//! [7]
+//! [8]
drag->exec();
setCursor(Qt::OpenHandCursor);
}
+//! [8]
+//! [4]
void ColorItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *)
{
setCursor(Qt::OpenHandCursor);
}
+//! [4]
diff --git a/examples/graphicsview/dragdroprobot/coloritem.h b/examples/graphicsview/dragdroprobot/coloritem.h
index 788d19e..eb19db6 100644
--- a/examples/graphicsview/dragdroprobot/coloritem.h
+++ b/examples/graphicsview/dragdroprobot/coloritem.h
@@ -44,6 +44,7 @@
#include <QGraphicsItem>
+//! [0]
class ColorItem : public QGraphicsItem
{
public:
@@ -60,5 +61,6 @@ protected:
private:
QColor color;
};
+//! [0]
#endif
diff --git a/examples/graphicsview/dragdroprobot/main.cpp b/examples/graphicsview/dragdroprobot/main.cpp
index 02585e1..2669c41 100644
--- a/examples/graphicsview/dragdroprobot/main.cpp
+++ b/examples/graphicsview/dragdroprobot/main.cpp
@@ -46,12 +46,14 @@
#include <math.h>
+//! [0]
int main(int argc, char **argv)
{
QApplication app(argc, argv);
qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
-
+//! [0]
+//! [1]
QGraphicsScene scene(-200, -200, 400, 400);
for (int i = 0; i < 10; ++i) {
@@ -66,7 +68,8 @@ int main(int argc, char **argv)
robot->scale(1.2, 1.2);
robot->setPos(0, -20);
scene.addItem(robot);
-
+//! [1]
+//! [2]
QGraphicsView view(&scene);
view.setRenderHint(QPainter::Antialiasing);
view.setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
@@ -76,3 +79,4 @@ int main(int argc, char **argv)
return app.exec();
}
+//! [2]
diff --git a/examples/graphicsview/dragdroprobot/robot.cpp b/examples/graphicsview/dragdroprobot/robot.cpp
index 9ac6d26..705bd9d 100644
--- a/examples/graphicsview/dragdroprobot/robot.cpp
+++ b/examples/graphicsview/dragdroprobot/robot.cpp
@@ -43,16 +43,18 @@
#include "robot.h"
+//! [0]
RobotPart::RobotPart(QGraphicsItem *parent)
- : QGraphicsItem(parent), color(Qt::lightGray), dragOver(false)
+ : QGraphicsObject(parent), color(Qt::lightGray), dragOver(false)
{
setAcceptDrops(true);
}
+//! [0]
+//! [1]
void RobotPart::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
{
- if (event->mimeData()->hasColor()
- || (qgraphicsitem_cast<RobotHead *>(this) && event->mimeData()->hasImage())) {
+ if (event->mimeData()->hasColor()) {
event->setAccepted(true);
dragOver = true;
update();
@@ -60,34 +62,42 @@ void RobotPart::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
event->setAccepted(false);
}
}
+//! [1]
+//! [2]
void RobotPart::dragLeaveEvent(QGraphicsSceneDragDropEvent *event)
{
Q_UNUSED(event);
dragOver = false;
update();
}
+//! [2]
+//! [3]
void RobotPart::dropEvent(QGraphicsSceneDragDropEvent *event)
{
dragOver = false;
if (event->mimeData()->hasColor())
color = qVariantValue<QColor>(event->mimeData()->colorData());
- else if (event->mimeData()->hasImage())
- pixmap = qVariantValue<QPixmap>(event->mimeData()->imageData());
update();
}
+//! [3]
+//! [4]
RobotHead::RobotHead(QGraphicsItem *parent)
: RobotPart(parent)
{
}
+//! [4]
+//! [5]
QRectF RobotHead::boundingRect() const
{
return QRectF(-15, -50, 30, 50);
}
+//! [5]
+//! [6]
void RobotHead::paint(QPainter *painter,
const QStyleOptionGraphicsItem *option, QWidget *widget)
{
@@ -110,11 +120,33 @@ void RobotHead::paint(QPainter *painter,
painter->drawPixmap(QPointF(-15 * 4.4, -50 * 3.54), pixmap);
}
}
+//! [6]
-int RobotHead::type() const
+//! [7]
+void RobotHead::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
{
- return Type;
+ if (event->mimeData()->hasImage()) {
+ event->setAccepted(true);
+ dragOver = true;
+ update();
+ } else {
+ RobotPart::dragEnterEvent(event);
+ }
}
+//! [7]
+
+//! [8]
+void RobotHead::dropEvent(QGraphicsSceneDragDropEvent *event)
+{
+ if (event->mimeData()->hasImage()) {
+ dragOver = false;
+ pixmap = qVariantValue<QPixmap>(event->mimeData()->imageData());
+ update();
+ } else {
+ RobotPart::dropEvent(event);
+ }
+}
+//! [8]
RobotTorso::RobotTorso(QGraphicsItem *parent)
: RobotPart(parent)
@@ -161,19 +193,25 @@ void RobotLimb::paint(QPainter *painter,
painter->drawEllipse(-5, -5, 10, 10);
}
-Robot::Robot()
+//! [10]
+Robot::Robot(QGraphicsItem *parent)
+ : RobotPart(parent)
{
- QGraphicsItem *torsoItem = new RobotTorso(this);
- QGraphicsItem *headItem = new RobotHead(torsoItem);
- QGraphicsItem *upperLeftArmItem = new RobotLimb(torsoItem);
- QGraphicsItem *lowerLeftArmItem = new RobotLimb(upperLeftArmItem);
- QGraphicsItem *upperRightArmItem = new RobotLimb(torsoItem);
- QGraphicsItem *lowerRightArmItem = new RobotLimb(upperRightArmItem);
- QGraphicsItem *upperRightLegItem = new RobotLimb(torsoItem);
- QGraphicsItem *lowerRightLegItem = new RobotLimb(upperRightLegItem);
- QGraphicsItem *upperLeftLegItem = new RobotLimb(torsoItem);
- QGraphicsItem *lowerLeftLegItem = new RobotLimb(upperLeftLegItem);
-
+ setFlag(ItemHasNoContents);
+
+ QGraphicsObject *torsoItem = new RobotTorso(this);
+ QGraphicsObject *headItem = new RobotHead(torsoItem);
+ QGraphicsObject *upperLeftArmItem = new RobotLimb(torsoItem);
+ QGraphicsObject *lowerLeftArmItem = new RobotLimb(upperLeftArmItem);
+ QGraphicsObject *upperRightArmItem = new RobotLimb(torsoItem);
+ QGraphicsObject *lowerRightArmItem = new RobotLimb(upperRightArmItem);
+ QGraphicsObject *upperRightLegItem = new RobotLimb(torsoItem);
+ QGraphicsObject *lowerRightLegItem = new RobotLimb(upperRightLegItem);
+ QGraphicsObject *upperLeftLegItem = new RobotLimb(torsoItem);
+ QGraphicsObject *lowerLeftLegItem = new RobotLimb(upperLeftLegItem);
+//! [10]
+
+//! [11]
headItem->setPos(0, -18);
upperLeftArmItem->setPos(-15, -10);
lowerLeftArmItem->setPos(30, 0);
@@ -183,82 +221,78 @@ Robot::Robot()
lowerRightLegItem->setPos(30, 0);
upperLeftLegItem->setPos(-10, 32);
lowerLeftLegItem->setPos(30, 0);
+//! [11]
- timeLine = new QTimeLine;
-
- QGraphicsItemAnimation *headAnimation = new QGraphicsItemAnimation;
- headAnimation->setItem(headItem);
- headAnimation->setTimeLine(timeLine);
- headAnimation->setRotationAt(0, 20);
- headAnimation->setRotationAt(1, -20);
- headAnimation->setScaleAt(1, 1.1, 1.1);
-
- QGraphicsItemAnimation *upperLeftArmAnimation = new QGraphicsItemAnimation;
- upperLeftArmAnimation->setItem(upperLeftArmItem);
- upperLeftArmAnimation->setTimeLine(timeLine);
- upperLeftArmAnimation->setRotationAt(0, 190);
- upperLeftArmAnimation->setRotationAt(1, 180);
-
- QGraphicsItemAnimation *lowerLeftArmAnimation = new QGraphicsItemAnimation;
- lowerLeftArmAnimation->setItem(lowerLeftArmItem);
- lowerLeftArmAnimation->setTimeLine(timeLine);
- lowerLeftArmAnimation->setRotationAt(0, 50);
- lowerLeftArmAnimation->setRotationAt(1, 10);
-
- QGraphicsItemAnimation *upperRightArmAnimation = new QGraphicsItemAnimation;
- upperRightArmAnimation->setItem(upperRightArmItem);
- upperRightArmAnimation->setTimeLine(timeLine);
- upperRightArmAnimation->setRotationAt(0, 300);
- upperRightArmAnimation->setRotationAt(1, 310);
-
- QGraphicsItemAnimation *lowerRightArmAnimation = new QGraphicsItemAnimation;
- lowerRightArmAnimation->setItem(lowerRightArmItem);
- lowerRightArmAnimation->setTimeLine(timeLine);
- lowerRightArmAnimation->setRotationAt(0, 0);
- lowerRightArmAnimation->setRotationAt(1, -70);
-
- QGraphicsItemAnimation *upperLeftLegAnimation = new QGraphicsItemAnimation;
- upperLeftLegAnimation->setItem(upperLeftLegItem);
- upperLeftLegAnimation->setTimeLine(timeLine);
- upperLeftLegAnimation->setRotationAt(0, 150);
- upperLeftLegAnimation->setRotationAt(1, 80);
-
- QGraphicsItemAnimation *lowerLeftLegAnimation = new QGraphicsItemAnimation;
- lowerLeftLegAnimation->setItem(lowerLeftLegItem);
- lowerLeftLegAnimation->setTimeLine(timeLine);
- lowerLeftLegAnimation->setRotationAt(0, 70);
- lowerLeftLegAnimation->setRotationAt(1, 10);
-
- QGraphicsItemAnimation *upperRightLegAnimation = new QGraphicsItemAnimation;
- upperRightLegAnimation->setItem(upperRightLegItem);
- upperRightLegAnimation->setTimeLine(timeLine);
- upperRightLegAnimation->setRotationAt(0, 40);
- upperRightLegAnimation->setRotationAt(1, 120);
-
- QGraphicsItemAnimation *lowerRightLegAnimation = new QGraphicsItemAnimation;
- lowerRightLegAnimation->setItem(lowerRightLegItem);
- lowerRightLegAnimation->setTimeLine(timeLine);
- lowerRightLegAnimation->setRotationAt(0, 10);
- lowerRightLegAnimation->setRotationAt(1, 50);
-
- QGraphicsItemAnimation *torsoAnimation = new QGraphicsItemAnimation;
- torsoAnimation->setItem(torsoItem);
- torsoAnimation->setTimeLine(timeLine);
- torsoAnimation->setRotationAt(0, 5);
- torsoAnimation->setRotationAt(1, -20);
-
- timeLine->setUpdateInterval(1000 / 25);
- timeLine->setCurveShape(QTimeLine::SineCurve);
- timeLine->setLoopCount(0);
- timeLine->setDuration(2000);
- timeLine->start();
-}
+//! [12]
+ QParallelAnimationGroup *animation = new QParallelAnimationGroup(this);
-Robot::~Robot()
-{
- delete timeLine;
+ QPropertyAnimation *headAnimation = new QPropertyAnimation(headItem, "rotation");
+ headAnimation->setStartValue(20);
+ headAnimation->setEndValue(-20);
+ QPropertyAnimation *headScaleAnimation = new QPropertyAnimation(headItem, "scale");
+ headScaleAnimation->setEndValue(1.1);
+ animation->addAnimation(headAnimation);
+ animation->addAnimation(headScaleAnimation);
+//! [12]
+
+ QPropertyAnimation *upperLeftArmAnimation = new QPropertyAnimation(upperLeftArmItem, "rotation");
+ upperLeftArmAnimation->setStartValue(190);
+ upperLeftArmAnimation->setEndValue(180);
+ animation->addAnimation(upperLeftArmAnimation);
+
+ QPropertyAnimation *lowerLeftArmAnimation = new QPropertyAnimation(lowerLeftArmItem, "rotation");
+ lowerLeftArmAnimation->setStartValue(50);
+ lowerLeftArmAnimation->setEndValue(10);
+ animation->addAnimation(lowerLeftArmAnimation);
+
+ QPropertyAnimation *upperRightArmAnimation = new QPropertyAnimation(upperRightArmItem, "rotation");
+ upperRightArmAnimation->setStartValue(300);
+ upperRightArmAnimation->setEndValue(310);
+ animation->addAnimation(upperRightArmAnimation);
+
+ QPropertyAnimation *lowerRightArmAnimation = new QPropertyAnimation(lowerRightArmItem, "rotation");
+ lowerRightArmAnimation->setStartValue(0);
+ lowerRightArmAnimation->setEndValue(-70);
+ animation->addAnimation(lowerRightArmAnimation);
+
+ QPropertyAnimation *upperLeftLegAnimation = new QPropertyAnimation(upperLeftLegItem, "rotation");
+ upperLeftLegAnimation->setStartValue(150);
+ upperLeftLegAnimation->setEndValue(80);
+ animation->addAnimation(upperLeftLegAnimation);
+
+ QPropertyAnimation *lowerLeftLegAnimation = new QPropertyAnimation(lowerLeftLegItem, "rotation");
+ lowerLeftLegAnimation->setStartValue(70);
+ lowerLeftLegAnimation->setEndValue(10);
+ animation->addAnimation(lowerLeftLegAnimation);
+
+ QPropertyAnimation *upperRightLegAnimation = new QPropertyAnimation(upperRightLegItem, "rotation");
+ upperRightLegAnimation->setStartValue(40);
+ upperRightLegAnimation->setEndValue(120);
+ animation->addAnimation(upperRightLegAnimation);
+
+ QPropertyAnimation *lowerRightLegAnimation = new QPropertyAnimation(lowerRightLegItem, "rotation");
+ lowerRightLegAnimation->setStartValue(10);
+ lowerRightLegAnimation->setEndValue(50);
+ animation->addAnimation(lowerRightLegAnimation);
+
+ QPropertyAnimation *torsoAnimation = new QPropertyAnimation(torsoItem, "rotation");
+ torsoAnimation->setStartValue(5);
+ torsoAnimation->setEndValue(-20);
+ animation->addAnimation(torsoAnimation);
+
+//! [13]
+ for (int i = 0; i < animation->animationCount(); ++i) {
+ QPropertyAnimation *anim = qobject_cast<QPropertyAnimation *>(animation->animationAt(i));
+ anim->setEasingCurve(QEasingCurve::SineCurve);
+ anim->setDuration(2000);
+ }
+
+ animation->setLoopCount(-1);
+ animation->start();
+//! [13]
}
+//! [9]
QRectF Robot::boundingRect() const
{
return QRectF();
@@ -271,3 +305,4 @@ void Robot::paint(QPainter *painter,
Q_UNUSED(option);
Q_UNUSED(widget);
}
+//! [9]
diff --git a/examples/graphicsview/dragdroprobot/robot.h b/examples/graphicsview/dragdroprobot/robot.h
index 88c4364..f5ff32c 100644
--- a/examples/graphicsview/dragdroprobot/robot.h
+++ b/examples/graphicsview/dragdroprobot/robot.h
@@ -46,10 +46,11 @@
QT_BEGIN_NAMESPACE
class QGraphicsSceneMouseEvent;
-class QTimeLine;
+class QParallelAnimationGroup;
QT_END_NAMESPACE
-class RobotPart : public QGraphicsItem
+//! [0]
+class RobotPart : public QGraphicsObject
{
public:
RobotPart(QGraphicsItem *parent = 0);
@@ -59,11 +60,12 @@ protected:
void dragLeaveEvent(QGraphicsSceneDragDropEvent *event);
void dropEvent(QGraphicsSceneDragDropEvent *event);
- QPixmap pixmap;
QColor color;
bool dragOver;
};
+//! [0]
+//! [1]
class RobotHead : public RobotPart
{
public:
@@ -72,10 +74,16 @@ public:
QRectF boundingRect() const;
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
- enum { Type = UserType + 1 };
- int type() const;
+protected:
+ void dragEnterEvent(QGraphicsSceneDragDropEvent *event);
+ void dropEvent(QGraphicsSceneDragDropEvent *event);
+
+private:
+ QPixmap pixmap;
};
+//! [1]
+//! [2]
class RobotTorso : public RobotPart
{
public:
@@ -84,7 +92,9 @@ public:
QRectF boundingRect() const;
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
};
+//! [2]
+//! [3]
class RobotLimb : public RobotPart
{
public:
@@ -93,18 +103,17 @@ public:
QRectF boundingRect() const;
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
};
+//! [3]
+//! [4]
class Robot : public RobotPart
{
public:
- Robot();
- ~Robot();
+ Robot(QGraphicsItem *parent = 0);
QRectF boundingRect() const;
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
-
-private:
- QTimeLine *timeLine;
};
+//! [4]
#endif
diff --git a/examples/graphicsview/elasticnodes/edge.cpp b/examples/graphicsview/elasticnodes/edge.cpp
index 25c769b..634fbee 100644
--- a/examples/graphicsview/elasticnodes/edge.cpp
+++ b/examples/graphicsview/elasticnodes/edge.cpp
@@ -49,6 +49,7 @@
static const double Pi = 3.14159265358979323846264338327950288419717;
static double TwoPi = 2.0 * Pi;
+//! [0]
Edge::Edge(Node *sourceNode, Node *destNode)
: arrowSize(10)
{
@@ -59,33 +60,21 @@ Edge::Edge(Node *sourceNode, Node *destNode)
dest->addEdge(this);
adjust();
}
+//! [0]
-Edge::~Edge()
-{
-}
-
+//! [1]
Node *Edge::sourceNode() const
{
return source;
}
-void Edge::setSourceNode(Node *node)
-{
- source = node;
- adjust();
-}
-
Node *Edge::destNode() const
{
return dest;
}
+//! [1]
-void Edge::setDestNode(Node *node)
-{
- dest = node;
- adjust();
-}
-
+//! [2]
void Edge::adjust()
{
if (!source || !dest)
@@ -104,7 +93,9 @@ void Edge::adjust()
sourcePoint = destPoint = line.p1();
}
}
+//! [2]
+//! [3]
QRectF Edge::boundingRect() const
{
if (!source || !dest)
@@ -118,7 +109,9 @@ QRectF Edge::boundingRect() const
.normalized()
.adjusted(-extra, -extra, extra, extra);
}
+//! [3]
+//! [4]
void Edge::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
{
if (!source || !dest)
@@ -127,11 +120,15 @@ void Edge::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
QLineF line(sourcePoint, destPoint);
if (qFuzzyCompare(line.length(), qreal(0.)))
return;
+//! [4]
+//! [5]
// Draw the line itself
painter->setPen(QPen(Qt::black, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
painter->drawLine(line);
+//! [5]
+//! [6]
// Draw the arrows
double angle = ::acos(line.dx() / line.length());
if (line.dy() >= 0)
@@ -150,3 +147,4 @@ void Edge::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
painter->drawPolygon(QPolygonF() << line.p1() << sourceArrowP1 << sourceArrowP2);
painter->drawPolygon(QPolygonF() << line.p2() << destArrowP1 << destArrowP2);
}
+//! [6]
diff --git a/examples/graphicsview/elasticnodes/edge.h b/examples/graphicsview/elasticnodes/edge.h
index b6b951f..58cc89c 100644
--- a/examples/graphicsview/elasticnodes/edge.h
+++ b/examples/graphicsview/elasticnodes/edge.h
@@ -46,17 +46,14 @@
class Node;
+//! [0]
class Edge : public QGraphicsItem
{
public:
Edge(Node *sourceNode, Node *destNode);
- ~Edge();
Node *sourceNode() const;
- void setSourceNode(Node *node);
-
Node *destNode() const;
- void setDestNode(Node *node);
void adjust();
@@ -74,5 +71,6 @@ private:
QPointF destPoint;
qreal arrowSize;
};
+//! [0]
#endif
diff --git a/examples/graphicsview/elasticnodes/graphwidget.cpp b/examples/graphicsview/elasticnodes/graphwidget.cpp
index 7c244be..8b419b8 100644
--- a/examples/graphicsview/elasticnodes/graphwidget.cpp
+++ b/examples/graphicsview/elasticnodes/graphwidget.cpp
@@ -43,14 +43,13 @@
#include "edge.h"
#include "node.h"
-#include <QDebug>
-#include <QGraphicsScene>
-#include <QWheelEvent>
+#include <QtGui>
#include <math.h>
-GraphWidget::GraphWidget()
- : timerId(0)
+//! [0]
+GraphWidget::GraphWidget(QWidget *parent)
+ : QGraphicsView(parent), timerId(0)
{
QGraphicsScene *scene = new QGraphicsScene(this);
scene->setItemIndexMethod(QGraphicsScene::NoIndex);
@@ -60,8 +59,12 @@ GraphWidget::GraphWidget()
setViewportUpdateMode(BoundingRectViewportUpdate);
setRenderHint(QPainter::Antialiasing);
setTransformationAnchor(AnchorUnderMouse);
- setResizeAnchor(AnchorViewCenter);
+ scale(qreal(0.8), qreal(0.8));
+ setMinimumSize(400, 400);
+ setWindowTitle(tr("Elastic Nodes"));
+//! [0]
+//! [1]
Node *node1 = new Node(this);
Node *node2 = new Node(this);
Node *node3 = new Node(this);
@@ -102,18 +105,18 @@ GraphWidget::GraphWidget()
node7->setPos(-50, 50);
node8->setPos(0, 50);
node9->setPos(50, 50);
-
- scale(qreal(0.8), qreal(0.8));
- setMinimumSize(400, 400);
- setWindowTitle(tr("Elastic Nodes"));
}
+//! [1]
+//! [2]
void GraphWidget::itemMoved()
{
if (!timerId)
timerId = startTimer(1000 / 25);
}
+//! [2]
+//! [3]
void GraphWidget::keyPressEvent(QKeyEvent *event)
{
switch (event->key()) {
@@ -146,7 +149,9 @@ void GraphWidget::keyPressEvent(QKeyEvent *event)
QGraphicsView::keyPressEvent(event);
}
}
+//! [3]
+//! [4]
void GraphWidget::timerEvent(QTimerEvent *event)
{
Q_UNUSED(event);
@@ -171,12 +176,16 @@ void GraphWidget::timerEvent(QTimerEvent *event)
timerId = 0;
}
}
+//! [4]
+//! [5]
void GraphWidget::wheelEvent(QWheelEvent *event)
{
scaleView(pow((double)2, -event->delta() / 240.0));
}
+//! [5]
+//! [6]
void GraphWidget::drawBackground(QPainter *painter, const QRectF &rect)
{
Q_UNUSED(rect);
@@ -213,12 +222,15 @@ void GraphWidget::drawBackground(QPainter *painter, const QRectF &rect)
painter->setPen(Qt::black);
painter->drawText(textRect, message);
}
+//! [6]
+//! [7]
void GraphWidget::scaleView(qreal scaleFactor)
{
- qreal factor = matrix().scale(scaleFactor, scaleFactor).mapRect(QRectF(0, 0, 1, 1)).width();
+ qreal factor = transform().scale(scaleFactor, scaleFactor).mapRect(QRectF(0, 0, 1, 1)).width();
if (factor < 0.07 || factor > 100)
return;
scale(scaleFactor, scaleFactor);
}
+//! [7]
diff --git a/examples/graphicsview/elasticnodes/graphwidget.h b/examples/graphicsview/elasticnodes/graphwidget.h
index 6f67b4e..3f78a5f 100644
--- a/examples/graphicsview/elasticnodes/graphwidget.h
+++ b/examples/graphicsview/elasticnodes/graphwidget.h
@@ -46,12 +46,13 @@
class Node;
+//! [0]
class GraphWidget : public QGraphicsView
{
Q_OBJECT
public:
- GraphWidget();
+ GraphWidget(QWidget *parent = 0);
void itemMoved();
@@ -67,5 +68,6 @@ private:
int timerId;
Node *centerNode;
};
+//! [0]
#endif
diff --git a/examples/graphicsview/elasticnodes/node.cpp b/examples/graphicsview/elasticnodes/node.cpp
index 774046c..495aa89 100644
--- a/examples/graphicsview/elasticnodes/node.cpp
+++ b/examples/graphicsview/elasticnodes/node.cpp
@@ -48,6 +48,7 @@
#include "node.h"
#include "graphwidget.h"
+//! [0]
Node::Node(GraphWidget *graphWidget)
: graph(graphWidget)
{
@@ -56,7 +57,9 @@ Node::Node(GraphWidget *graphWidget)
setCacheMode(DeviceCoordinateCache);
setZValue(-1);
}
+//! [0]
+//! [1]
void Node::addEdge(Edge *edge)
{
edgeList << edge;
@@ -67,14 +70,18 @@ QList<Edge *> Node::edges() const
{
return edgeList;
}
+//! [1]
+//! [2]
void Node::calculateForces()
{
if (!scene() || scene()->mouseGrabberItem() == this) {
newPos = pos();
return;
}
-
+//! [2]
+
+//! [3]
// Sum up all forces pushing this item away
qreal xvel = 0;
qreal yvel = 0;
@@ -83,37 +90,45 @@ void Node::calculateForces()
if (!node)
continue;
- QLineF line(mapFromItem(node, 0, 0), QPointF(0, 0));
- qreal dx = line.dx();
- qreal dy = line.dy();
+ QPointF vec = mapToItem(node, 0, 0);
+ qreal dx = vec.x();
+ qreal dy = vec.y();
double l = 2.0 * (dx * dx + dy * dy);
if (l > 0) {
xvel += (dx * 150.0) / l;
yvel += (dy * 150.0) / l;
}
}
+//! [3]
+//! [4]
// Now subtract all forces pulling items together
double weight = (edgeList.size() + 1) * 10;
foreach (Edge *edge, edgeList) {
- QPointF pos;
+ QPointF vec;
if (edge->sourceNode() == this)
- pos = mapFromItem(edge->destNode(), 0, 0);
+ vec = mapToItem(edge->destNode(), 0, 0);
else
- pos = mapFromItem(edge->sourceNode(), 0, 0);
- xvel += pos.x() / weight;
- yvel += pos.y() / weight;
+ vec = mapToItem(edge->sourceNode(), 0, 0);
+ xvel -= vec.x() / weight;
+ yvel -= vec.y() / weight;
}
-
+//! [4]
+
+//! [5]
if (qAbs(xvel) < 0.1 && qAbs(yvel) < 0.1)
xvel = yvel = 0;
+//! [5]
+//! [6]
QRectF sceneRect = scene()->sceneRect();
newPos = pos() + QPointF(xvel, yvel);
newPos.setX(qMin(qMax(newPos.x(), sceneRect.left() + 10), sceneRect.right() - 10));
newPos.setY(qMin(qMax(newPos.y(), sceneRect.top() + 10), sceneRect.bottom() - 10));
}
+//! [6]
+//! [7]
bool Node::advance()
{
if (newPos == pos())
@@ -122,21 +137,27 @@ bool Node::advance()
setPos(newPos);
return true;
}
+//! [7]
+//! [8]
QRectF Node::boundingRect() const
{
qreal adjust = 2;
return QRectF(-10 - adjust, -10 - adjust,
23 + adjust, 23 + adjust);
}
+//! [8]
+//! [9]
QPainterPath Node::shape() const
{
QPainterPath path;
path.addEllipse(-10, -10, 20, 20);
return path;
}
+//! [9]
+//! [10]
void Node::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *)
{
painter->setPen(Qt::NoPen);
@@ -157,7 +178,9 @@ void Node::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWid
painter->setPen(QPen(Qt::black, 0));
painter->drawEllipse(-10, -10, 20, 20);
}
+//! [10]
+//! [11]
QVariant Node::itemChange(GraphicsItemChange change, const QVariant &value)
{
switch (change) {
@@ -172,7 +195,9 @@ QVariant Node::itemChange(GraphicsItemChange change, const QVariant &value)
return QGraphicsItem::itemChange(change, value);
}
+//! [11]
+//! [12]
void Node::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
update();
@@ -184,3 +209,4 @@ void Node::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
update();
QGraphicsItem::mouseReleaseEvent(event);
}
+//! [12]
diff --git a/examples/graphicsview/elasticnodes/node.h b/examples/graphicsview/elasticnodes/node.h
index 0df579d..990346e 100644
--- a/examples/graphicsview/elasticnodes/node.h
+++ b/examples/graphicsview/elasticnodes/node.h
@@ -51,6 +51,7 @@ QT_BEGIN_NAMESPACE
class QGraphicsSceneMouseEvent;
QT_END_NAMESPACE
+//! [0]
class Node : public QGraphicsItem
{
public:
@@ -80,5 +81,6 @@ private:
QPointF newPos;
GraphWidget *graph;
};
+//! [0]
#endif
generated by cgit v0.12 at 2024-11-10 06:14:39 (GMT)