1 files changed, 138 insertions, 0 deletions
diff --git a/src/charts/ChartAxes.cpp b/src/charts/ChartAxes.cpp
new file mode 100644
index 0000000..caf8828
--- /dev/null
+++ b/src/charts/ChartAxes.cpp
@@ -0,0 +1,138 @@
+#include "ChartAxes.h"
+#include "ChartScene.h"
+
+#include <cmath>
+
+const QPointF ChartAxes::XLabelOffset(0, 5);
+const QPointF ChartAxes::YLabelOffset(-10, -7);
+const QFont ChartAxes::TickLabelFont("Sans Serif", 11);
+
+ChartAxes::ChartAxes(ChartScene* scene, int xTickInterval):
+    scene(scene), xTickInterval(xTickInterval)
+{
+}
+
+void ChartAxes::paint()
+{
+    addAxisLines();
+    addTicks();
+}
+
+void ChartAxes::addAxisLines()
+{
+    QPointF chartOrigin = scene->getChartOrigin();
+    QRectF chartRect = scene->getChartRect();
+    scene->addLine(QLineF(chartOrigin, chartRect.topLeft()));
+    scene->addLine(QLineF(chartOrigin, chartRect.bottomRight()));
+}
+
+void ChartAxes::addTicks()
+{
+    addXTicks();
+    addYTicks();
+}
+
+void ChartAxes::addXTicks()
+{
+    qreal tickSpacing = scene->getDataDirection() * scene->getXTickSpacing();
+    QPointF pos = getTickOrigin(XTick);
+    for(int i = 0; i < scene->getDataSet().size(); i++)
+    {
+        addLabelledXTick(i, pos);
+        pos.rx() += tickSpacing;
+    }
+}
+
+void ChartAxes::addLabelledXTick(int index, QPointF& pos)
+{
+    if(index % xTickInterval == 0)
+    {
+        addTick(pos, XTick);
+        DataPoint point = scene->getDataSet().at(index);
+        addLabel(point.label, pos, XTick);
+    }
+}
+
+QPointF ChartAxes::getTickOrigin(TickOrientation orientation) const
+{
+    QPointF res = scene->getChartOrigin();
+    if(orientation == XTick)
+    {
+        if(scene->getDataDirection() == 1)
+            res.rx() += ChartScene::DataSetPadding.width();
+        else
+            res.rx() += scene->getChartRect().width();
+    }
+    else
+        res.ry() -= ChartScene::DataSetPadding.height();
+    return res;
+}
+
+void ChartAxes::addTick(const QPointF& pos, TickOrientation orientation)
+{
+    QPointF end = pos + getTickVector(orientation);
+    scene->addLine(QLineF(pos, end));
+}
+
+QPointF ChartAxes::getTickVector(TickOrientation orientation)
+{
+    if(orientation == XTick)
+        return QPointF(0, TickLength);
+    else
+        return QPointF(-TickLength, 0);
+}
+
+void ChartAxes::addLabel(const QString& labelText, const QPointF& pos,
+    TickOrientation orientation)
+{
+    QPointF labelOffset = getLabelOffset(orientation);
+    QGraphicsItem* textItem = scene->addSimpleText(labelText, TickLabelFont);    
+    qreal xAlignOffset = getLabelXAlignOffset(
+                textItem->boundingRect().width(), orientation);
+    textItem->setPos(pos + labelOffset + QPointF(xAlignOffset, 0));
+}
+
+QPointF ChartAxes::getLabelOffset(TickOrientation orientation)
+{
+    if(orientation == XTick)
+        return XLabelOffset;
+    else
+        return YLabelOffset;
+}
+
+qreal ChartAxes::getLabelXAlignOffset(qreal labelWidth, TickOrientation orientation)
+{
+    if(orientation == XTick)
+        return -labelWidth / 2;
+    else
+        return -labelWidth;
+}
+
+void ChartAxes::addYTicks()
+{
+    int valueSpacing = scene->getYTickSpacing();
+    qreal posSpacing = scene->getYPosFromValue(valueSpacing);
+    QPointF pos = getTickOrigin(YTick);
+    for(int value = scene->getMinY(); value <= scene->getMaxY();
+        value += valueSpacing)
+    {
+        addLabelledYTick(value, pos, posSpacing);
+        if(valueSpacing == 0)
+            break;
+    }
+}
+
+void ChartAxes::addLabelledYTick(int value, QPointF& pos, qreal posSpacing)
+{
+    addTick(pos, YTick);
+    addLabel(QString::number(value), pos, YTick);
+    addHRuler(pos);
+    pos.ry() -= posSpacing;
+}
+
+void ChartAxes::addHRuler(const QPointF& pos)
+    {
+        QPointF end = pos;
+        end.rx() += scene->getChartRect().width();
+        scene->addLine(QLineF(pos, end), QPen(Qt::lightGray));
+    }