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, 231 insertions, 0 deletions

diff --git a/src/domain/xlogypolardomain.cpp b/src/domain/xlogypolardomain.cpp
new file mode 100644
index 00000000..730a9dcd
--- /dev/null
+++ b/src/domain/xlogypolardomain.cpp
@@ -0,0 +1,231 @@
+/****************************************************************************
+**
+** 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 "xlogypolardomain_p.h"
+#include "qabstractaxis_p.h"
+#include "qlogvalueaxis.h"
+#include <qmath.h>
+
+QTCOMMERCIALCHART_BEGIN_NAMESPACE
+
+XLogYPolarDomain::XLogYPolarDomain(QObject *parent)
+    : PolarDomain(parent),
+      m_logInnerY(0),
+      m_logOuterY(1),
+      m_logBaseY(10)
+{
+}
+
+XLogYPolarDomain::~XLogYPolarDomain()
+{
+}
+
+void XLogYPolarDomain::setRange(qreal minX, qreal maxX, qreal minY, qreal maxY)
+{
+    bool axisXChanged = false;
+    bool axisYChanged = false;
+
+    adjustLogDomainRanges(minY, maxY);
+
+    if (!qFuzzyIsNull(m_minX - minX) || !qFuzzyIsNull(m_maxX - maxX)) {
+        m_minX = minX;
+        m_maxX = maxX;
+        axisXChanged = true;
+        if (!m_signalsBlocked)
+            emit rangeHorizontalChanged(m_minX, m_maxX);
+    }
+
+    if (!qFuzzyIsNull(m_minY - minY) || !qFuzzyIsNull(m_maxY - maxY)) {
+        m_minY = minY;
+        m_maxY = maxY;
+        axisYChanged = true;
+        qreal logMinY = log10(m_minY) / log10(m_logBaseY);
+        qreal logMaxY = log10(m_maxY) / log10(m_logBaseY);
+        m_logInnerY = logMinY < logMaxY ? logMinY : logMaxY;
+        m_logOuterY = logMinY > logMaxY ? logMinY : logMaxY;
+        if (!m_signalsBlocked)
+            emit rangeVerticalChanged(m_minY, m_maxY);
+    }
+
+    if (axisXChanged || axisYChanged)
+        emit updated();
+}
+
+void XLogYPolarDomain::zoomIn(const QRectF &rect)
+{
+    qreal dx = spanX() / m_size.width();
+    qreal maxX = m_maxX;
+    qreal minX = m_minX;
+
+    maxX = minX + dx * rect.right();
+    minX = minX + dx * rect.left();
+
+    qreal logLeftY = m_logOuterY - rect.bottom() * (m_logOuterY - m_logInnerY) / m_size.height();
+    qreal logRightY = m_logOuterY - rect.top() * (m_logOuterY - m_logInnerY) / m_size.height();
+    qreal leftY = qPow(m_logBaseY, logLeftY);
+    qreal rightY = qPow(m_logBaseY, logRightY);
+    qreal minY = leftY < rightY ? leftY : rightY;
+    qreal maxY = leftY > rightY ? leftY : rightY;
+
+    setRange(minX, maxX, minY, maxY);
+}
+
+void XLogYPolarDomain::zoomOut(const QRectF &rect)
+{
+    qreal dx = spanX() / rect.width();
+    qreal maxX = m_maxX;
+    qreal minX = m_minX;
+
+    minX = maxX - dx * rect.right();
+    maxX = minX + dx * m_size.width();
+
+    const qreal factorY = m_size.height() / rect.height();
+    qreal newLogMinY = m_logInnerY + (m_logOuterY - m_logInnerY) / 2.0 * (1.0 - factorY);
+    qreal newLogMaxY = m_logInnerY + (m_logOuterY - m_logInnerY) / 2.0 * (1.0 + factorY);
+    qreal leftY = qPow(m_logBaseY, newLogMinY);
+    qreal rightY = qPow(m_logBaseY, newLogMaxY);
+    qreal minY = leftY < rightY ? leftY : rightY;
+    qreal maxY = leftY > rightY ? leftY : rightY;
+
+    setRange(minX, maxX, minY, maxY);
+}
+
+void XLogYPolarDomain::move(qreal dx, qreal dy)
+{
+    qreal x = spanX() / 360.0;
+
+    qreal maxX = m_maxX;
+    qreal minX = m_minX;
+
+    if (dx != 0) {
+        minX = minX + x * dx;
+        maxX = maxX + x * dx;
+    }
+
+    qreal stepY = dy * (m_logOuterY - m_logInnerY) / m_radius;
+    qreal leftY = qPow(m_logBaseY, m_logInnerY + stepY);
+    qreal rightY = qPow(m_logBaseY, m_logOuterY + stepY);
+    qreal minY = leftY < rightY ? leftY : rightY;
+    qreal maxY = leftY > rightY ? leftY : rightY;
+
+    setRange(minX, maxX, minY, maxY);
+}
+
+qreal XLogYPolarDomain::toAngularCoordinate(qreal value, bool &ok) const
+{
+    ok = true;
+    qreal f = (value - m_minX) / (m_maxX - m_minX);
+    return f * 360.0;
+}
+
+qreal XLogYPolarDomain::toRadialCoordinate(qreal value, bool &ok) const
+{
+    qreal retVal;
+    if (value <= 0) {
+        ok = false;
+        retVal = 0.0;
+    } else {
+        ok =  true;
+        const qreal tickSpan = m_radius / qAbs(m_logOuterY - m_logInnerY);
+        const qreal logValue = log10(value) / log10(m_logBaseY);
+        const qreal valueDelta = logValue - m_logInnerY;
+
+        retVal = valueDelta * tickSpan;
+
+        if (retVal < 0.0)
+            retVal = 0.0;
+    }
+    return retVal;
+}
+
+QPointF XLogYPolarDomain::calculateDomainPoint(const QPointF &point) const
+{
+    if (point == m_center)
+        return QPointF(0.0, m_minY);
+
+    QLineF line(m_center, point);
+    qreal a = 90.0 - line.angle();
+    if (a < 0.0)
+        a += 360.0;
+    a = ((a / 360.0) * (m_maxX - m_minX)) + m_minX;
+
+    const qreal deltaY = m_radius / qAbs(m_logOuterY - m_logInnerY);
+    qreal r = qPow(m_logBaseY, m_logInnerY + (line.length() / deltaY));
+
+    return QPointF(a, r);
+}
+
+bool XLogYPolarDomain::attachAxis(QAbstractAxis *axis)
+{
+    QLogValueAxis *logAxis = qobject_cast<QLogValueAxis *>(axis);
+
+    if (logAxis && logAxis->orientation() == Qt::Vertical) {
+        QObject::connect(logAxis, SIGNAL(baseChanged(qreal)), this, SLOT(handleVerticalAxisBaseChanged(qreal)));
+        handleVerticalAxisBaseChanged(logAxis->base());
+    }
+    return  AbstractDomain::attachAxis(axis);
+}
+
+bool XLogYPolarDomain::detachAxis(QAbstractAxis *axis)
+{
+    QLogValueAxis *logAxis = qobject_cast<QLogValueAxis *>(axis);
+
+    if (logAxis && logAxis->orientation() == Qt::Vertical)
+        QObject::disconnect(logAxis, SIGNAL(baseChanged(qreal)), this, SLOT(handleVerticalAxisBaseChanged(qreal)));
+
+    return AbstractDomain::detachAxis(axis);
+}
+
+void XLogYPolarDomain::handleVerticalAxisBaseChanged(qreal baseY)
+{
+    m_logBaseY = baseY;
+    qreal logMinY = log10(m_minY) / log10(m_logBaseY);
+    qreal logMaxY = log10(m_maxY) / log10(m_logBaseY);
+    m_logInnerY = logMinY < logMaxY ? logMinY : logMaxY;
+    m_logOuterY = logMinY > logMaxY ? logMinY : logMaxY;
+    emit updated();
+}
+
+// operators
+
+bool QTCOMMERCIALCHART_AUTOTEST_EXPORT operator== (const XLogYPolarDomain &domain1, const XLogYPolarDomain &domain2)
+{
+    return (qFuzzyIsNull(domain1.m_maxX - domain2.m_maxX)
+            && qFuzzyIsNull(domain1.m_maxY - domain2.m_maxY)
+            && qFuzzyIsNull(domain1.m_minX - domain2.m_minX)
+            && qFuzzyIsNull(domain1.m_minY - domain2.m_minY));
+}
+
+
+bool QTCOMMERCIALCHART_AUTOTEST_EXPORT operator!= (const XLogYPolarDomain &domain1, const XLogYPolarDomain &domain2)
+{
+    return !(domain1 == domain2);
+}
+
+
+QDebug QTCOMMERCIALCHART_AUTOTEST_EXPORT operator<<(QDebug dbg, const XLogYPolarDomain &domain)
+{
+    dbg.nospace() << "AbstractDomain(" << domain.m_minX << ',' << domain.m_maxX << ',' << domain.m_minY << ',' << domain.m_maxY << ')' << domain.m_size;
+    return dbg.maybeSpace();
+}
+
+#include "moc_xlogypolardomain_p.cpp"
+
+QTCOMMERCIALCHART_END_NAMESPACE