Add Polar chart support

This commit also heavily refactors things as polar chart needs
separate implementation of various classes that previously
only needed one, such as ChartAxis and ChartLayout.

Task-number: QTRD-1757
Change-Id: I3d3db23920314987ceef3ae92879960b833b7136
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>

1 files changed, 95 insertions, 0 deletions

diff --git a/src/axis/logvalueaxis/polarchartlogvalueaxisradial.cpp b/src/axis/logvalueaxis/polarchartlogvalueaxisradial.cpp
new file mode 100644
index 00000000..d0719dbc
--- /dev/null
+++ b/src/axis/logvalueaxis/polarchartlogvalueaxisradial.cpp
@@ -0,0 +1,95 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc
+** All rights reserved.
+** For any questions to Digia, please use contact form at http://qt.digia.com
+**
+** This file is part of the Qt Commercial Charts Add-on.
+**
+** $QT_BEGIN_LICENSE$
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.
+**
+** If you have questions regarding the use of this file, please use
+** contact form at http://qt.digia.com
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "polarchartlogvalueaxisradial_p.h"
+#include "abstractchartlayout_p.h"
+#include "chartpresenter_p.h"
+#include "qlogvalueaxis.h"
+#include <qmath.h>
+#include <QDebug>
+
+QTCOMMERCIALCHART_BEGIN_NAMESPACE
+
+PolarChartLogValueAxisRadial::PolarChartLogValueAxisRadial(QLogValueAxis *axis, QGraphicsItem *item)
+    : PolarChartAxisRadial(axis, item)
+{
+    QObject::connect(axis, SIGNAL(baseChanged(qreal)), this, SLOT(handleBaseChanged(qreal)));
+    QObject::connect(axis, SIGNAL(labelFormatChanged(QString)), this, SLOT(handleLabelFormatChanged(QString)));
+}
+
+PolarChartLogValueAxisRadial::~PolarChartLogValueAxisRadial()
+{
+}
+
+QVector<qreal> PolarChartLogValueAxisRadial::calculateLayout() const
+{
+    QLogValueAxis *logValueAxis = static_cast<QLogValueAxis *>(axis());
+    const qreal logMax = log10(logValueAxis->max()) / log10(logValueAxis->base());
+    const qreal logMin = log10(logValueAxis->min()) / log10(logValueAxis->base());
+    const qreal innerEdge = logMin < logMax ? logMin : logMax;
+    const qreal outerEdge = logMin > logMax ? logMin : logMax;
+    const qreal delta = (axisGeometry().width() / 2.0) / qAbs(logMax - logMin);
+    const qreal initialSpan = (ceil(innerEdge) - innerEdge) * delta;
+    int tickCount = qAbs(ceil(logMax) - ceil(logMin));
+
+    // Extra tick if outer edge is exactly at the tick
+    if (outerEdge == ceil(outerEdge))
+        tickCount++;
+
+    QVector<qreal> points;
+    points.resize(tickCount);
+
+    for (int i = 0; i < tickCount; ++i) {
+        qreal radialCoordinate = initialSpan + (delta * qreal(i));
+        points[i] = radialCoordinate;
+    }
+
+    return points;
+}
+
+void PolarChartLogValueAxisRadial::createAxisLabels(const QVector<qreal> &layout)
+{
+    QLogValueAxis *logValueAxis = static_cast<QLogValueAxis *>(axis());
+    setLabels(createLogValueLabels(logValueAxis->min(),
+                                   logValueAxis->max(),
+                                   logValueAxis->base(),
+                                   layout.size(),
+                                   logValueAxis->labelFormat()));
+}
+
+void PolarChartLogValueAxisRadial::handleBaseChanged(qreal base)
+{
+    Q_UNUSED(base);
+    QGraphicsLayoutItem::updateGeometry();
+    if (presenter())
+        presenter()->layout()->invalidate();
+}
+
+void PolarChartLogValueAxisRadial::handleLabelFormatChanged(const QString &format)
+{
+    Q_UNUSED(format);
+    QGraphicsLayoutItem::updateGeometry();
+    if (presenter())
+        presenter()->layout()->invalidate();
+}
+
+#include "moc_polarchartlogvalueaxisradial_p.cpp"
+
+QTCOMMERCIALCHART_END_NAMESPACE