Transform the DiveProfileItem to an Abstract Generalization

The DiveProfileItem contained much of the complexity and
algorithms for almost all line-based items on the canvas,
so I transformed that to a general abstraction and implemented
a new DiveProfileItem that uses it. this should reduce a
bit of code since the implementation of the PP Graphs, Temperature
Cylinder Pressure and maybe a few others will only need to
reimplement the paint() and the modelDataChanged() methods.
The rest is ready.

Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/profile/diveeventitem.cpp

@@ -14,19 +14,19 @@ DiveEventItem::DiveEventItem(QObject* parent): DivePixmapItem(parent),
 void DiveEventItem::setHorizontalAxis(DiveCartesianAxis* axis)
 {
 	hAxis = axis;
-	recalculate();
+	recalculatePos();
 }
 
 void DiveEventItem::setModel(DivePlotDataModel* model)
 {
 	dataModel = model;
-	recalculate();
+	recalculatePos();
 }
 
 void DiveEventItem::setVerticalAxis(DiveCartesianAxis* axis)
 {
 	vAxis = axis;
-	recalculate();
+	recalculatePos();
 }
 
 void DiveEventItem::setEvent(struct event* ev)
@@ -34,7 +34,7 @@ void DiveEventItem::setEvent(struct event* ev)
 	internalEvent = ev;
 	setupPixmap();
 	setupToolTipString();
-	recalculate();
+	recalculatePos();
 }
 
 void DiveEventItem::setupPixmap()
@@ -102,12 +102,11 @@ void DiveEventItem::eventVisibilityChanged(const QString& eventName, bool visibl
 
 }
 
-void DiveEventItem::recalculate()
+void DiveEventItem::recalculatePos()
 {
 	if (!vAxis || !hAxis || !internalEvent || !dataModel){
 		return;
 	}
-	qDebug() << "Calculating.";
 	QModelIndexList result = dataModel->match(dataModel->index(0,DivePlotDataModel::TIME), Qt::DisplayRole, internalEvent->time.seconds );
 	if(result.isEmpty()){
 		hide();

qt-ui/profile/diveeventitem.h

@@ -16,9 +16,9 @@ public:
 	void setVerticalAxis(DiveCartesianAxis *axis);
 	void setHorizontalAxis(DiveCartesianAxis *axis);
 	void setModel(DivePlotDataModel *model);
-	void recalculate();
 private:
 	void setupToolTipString();
+	void recalculatePos();
 	void setupPixmap();
 	DiveCartesianAxis *vAxis;
 	DiveCartesianAxis *hAxis;

qt-ui/profile/diveprofileitem.cpp

@@ -7,43 +7,43 @@
 #include <QPainter>
 #include <QLinearGradient>
 
-DiveProfileItem::DiveProfileItem(): QObject(), QGraphicsPolygonItem(),
+AbstractProfilePolygonItem::AbstractProfilePolygonItem(): QObject(), QGraphicsPolygonItem(),
 	hAxis(NULL), vAxis(NULL), dataModel(NULL), hDataColumn(-1), vDataColumn(-1)
 {
 
 }
 
-void DiveProfileItem::setHorizontalAxis(DiveCartesianAxis* horizontal)
+void AbstractProfilePolygonItem::setHorizontalAxis(DiveCartesianAxis* horizontal)
 {
 	hAxis = horizontal;
 	modelDataChanged();
 }
 
-void DiveProfileItem::setHorizontalDataColumn(int column)
+void AbstractProfilePolygonItem::setHorizontalDataColumn(int column)
 {
 	hDataColumn = column;
 	modelDataChanged();
 }
 
-void DiveProfileItem::setModel(QAbstractTableModel* model)
+void AbstractProfilePolygonItem::setModel(QAbstractTableModel* model)
 {
 	dataModel = model;
 	modelDataChanged();
 }
 
-void DiveProfileItem::setVerticalAxis(DiveCartesianAxis* vertical)
+void AbstractProfilePolygonItem::setVerticalAxis(DiveCartesianAxis* vertical)
 {
 	vAxis = vertical;
 	modelDataChanged();
 }
 
-void DiveProfileItem::setVerticalDataColumn(int column)
+void AbstractProfilePolygonItem::setVerticalDataColumn(int column)
 {
 	vDataColumn = column;
 	modelDataChanged();
 }
 
-void DiveProfileItem::modelDataChanged()
+void AbstractProfilePolygonItem::modelDataChanged()
 {
 	// We don't have enougth data to calculate things, quit.
 	if (!hAxis || !vAxis || !dataModel || hDataColumn == -1 || vDataColumn == -1)
@@ -62,13 +62,6 @@ void DiveProfileItem::modelDataChanged()
 		poly.append(point);
 	}
 	setPolygon(poly);
-
-	// This is the blueish gradient that the Depth Profile should have.
-	// It's a simple QLinearGradient with 2 stops, starting from top to bottom.
-	QLinearGradient pat(0, poly.boundingRect().top(), 0, poly.boundingRect().bottom());
-	pat.setColorAt(1, getColor(DEPTH_BOTTOM));
-	pat.setColorAt(0, getColor(DEPTH_TOP));
-	setBrush(QBrush(pat));
 }
 
 void DiveProfileItem::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget) {
@@ -92,3 +85,15 @@ void DiveProfileItem::paint(QPainter* painter, const QStyleOptionGraphicsItem* o
 		painter->drawLine(polygon()[i-1],polygon()[i]);
 	}
 }
+
+void DiveProfileItem::modelDataChanged(){
+	AbstractProfilePolygonItem::modelDataChanged();
+	if(polygon().isEmpty())
+		return;
+		// This is the blueish gradient that the Depth Profile should have.
+	// It's a simple QLinearGradient with 2 stops, starting from top to bottom.
+	QLinearGradient pat(0, polygon().boundingRect().top(), 0, polygon().boundingRect().bottom());
+	pat.setColorAt(1, getColor(DEPTH_BOTTOM));
+	pat.setColorAt(0, getColor(DEPTH_TOP));
+	setBrush(QBrush(pat));
+}

qt-ui/profile/diveprofileitem.h

@@ -21,22 +21,22 @@
 class DiveCartesianAxis;
 class QAbstractTableModel;
 
-class DiveProfileItem : public QObject, public QGraphicsPolygonItem{
+class AbstractProfilePolygonItem : public QObject, public QGraphicsPolygonItem{
 	Q_OBJECT
 	Q_PROPERTY(QPointF pos WRITE setPos READ pos)
 	Q_PROPERTY(qreal x WRITE setX READ x)
 	Q_PROPERTY(qreal y WRITE setY READ y)
 public:
-	DiveProfileItem();
+	AbstractProfilePolygonItem();
 	void setVerticalAxis(DiveCartesianAxis *vertical);
 	void setHorizontalAxis(DiveCartesianAxis *horizontal);
 	void setModel(QAbstractTableModel *model);
 	void setHorizontalDataColumn(int column);
 	void setVerticalDataColumn(int column);
-	virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0);
+	virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0) = 0;
 public slots:
-	void modelDataChanged();
+	virtual void modelDataChanged();
-private:
+protected:
 	DiveCartesianAxis *hAxis;
 	DiveCartesianAxis *vAxis;
 	QAbstractTableModel *dataModel;
@@ -44,5 +44,11 @@ private:
 	int vDataColumn;
 };
 
+class DiveProfileItem : public AbstractProfilePolygonItem{
+	Q_OBJECT
+public:
+    virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0);
+    virtual void modelDataChanged();
+};
 
 #endif