Add grid chart

limereport/items/charts/lrgridlineschart.cpp

@@ -0,0 +1,110 @@
+#include "lrgridlineschart.h"
+
+namespace LimeReport {
+void GridLinesChart::paintChart(QPainter *painter, QRectF chartRect)
+{
+    updateMinAndMaxValues();
+
+    const qreal valuesHMargin = this->valuesHMargin(painter);
+    const qreal valuesVMargin = this->valuesVMargin(painter);
+
+    const qreal hPadding = this->hPadding(chartRect);
+    const qreal vPadding = this->vPadding(chartRect);
+
+    QRectF calcRect = horizontalLabelsRect(
+        painter,
+        chartRect.adjusted(
+            hPadding * 2 + valuesHMargin,
+            chartRect.height() - (painter->fontMetrics().height() + vPadding*2),
+            -(hPadding * 2),
+            -vPadding
+            )
+        );
+    const qreal barsShift = calcRect.height();
+    const qreal topOffset = painter->fontMetrics().height() * (m_chartItem->horizontalAxisOnTop() ? 1 : -1);
+    const QRectF gridRect = chartRect.adjusted(
+        hPadding,
+        vPadding + valuesVMargin + topOffset,
+        -hPadding * 3,
+        -(vPadding + barsShift)
+        );
+
+    paintGrid(painter, gridRect);
+
+    paintSerialLines(
+        painter,
+        gridRect.adjusted(hPadding + valuesHMargin, 0, 0, 0)
+        );
+    paintHorizontalLabels(painter, calcRect);
+}
+
+void GridLinesChart::paintSerialLines(QPainter* painter, QRectF barsRect)
+{
+    if (valuesCount() == 0) return;
+
+    painter->save();
+    painter->setRenderHint(QPainter::Antialiasing,true);
+
+    const AxisData &yAxisData = this->yAxisData();
+    const qreal delta = yAxisData.delta();
+
+    if (m_chartItem->itemMode() == DesignMode){
+        const qreal hStep = barsRect.width() / valuesCount();
+        const qreal vStep = barsRect.height() / delta;
+        const qreal topShift = (delta - (maxValue() - minValue())) * vStep + barsRect.top();
+        drawDesignMode(painter, hStep, vStep, topShift, barsRect);
+        painter->restore();
+        return;
+    }
+
+    const AxisData &xAxisData = this->xAxisData();
+    const qreal hStep = barsRect.width() / (xAxisData.rangeMax() - xAxisData.rangeMin());
+
+    qreal leftMargin = 0;
+    const qreal topMargin = barsRect.top();
+
+    for (SeriesItem* series : m_chartItem->series()) {
+        QPen pen(series->color());
+        pen.setWidth(m_chartItem->seriesLineWidth());
+        painter->setPen(pen);
+
+        const QList<qreal> &xAxisValues = series->data()->xAxisValues();
+        const QList<qreal> &values = series->data()->values();
+        const int xAxisValuesSize = xAxisValues.size();
+        qreal lastXPos = 0;
+        qreal lastYPos = 0;
+        if (!values.isEmpty()) {
+            // Calculate first point position on plot before loop
+            lastYPos = calculatePos(yAxisData, values.first(), barsRect.height());
+        }
+        if (xAxisValues.isEmpty()) {
+            leftMargin = barsRect.left();
+        } else {
+            leftMargin = barsRect.left();
+            lastXPos = calculatePos(xAxisData, xAxisValues.first(), barsRect.width());
+        }
+        for (int i = 0; i < values.count() - 1; ++i ) {
+            const qreal startY = lastYPos;
+            const qreal endY = calculatePos(yAxisData, values.at(i+1), barsRect.height());
+            // Record last used Y position to only calculate new one
+            lastYPos = endY;
+
+            qreal startX = lastXPos;
+            qreal endX = 0;
+            if (i + 1 < xAxisValuesSize) {
+                endX = calculatePos(xAxisData, xAxisValues.at(i+1), barsRect.width());
+            } else {
+                endX = startX + hStep;
+            }
+            // Record last used X position to only calculate new one
+            lastXPos = endX;
+
+            QPoint startPoint = QPoint(startX + leftMargin, startY + topMargin);
+            QPoint endPoint = QPoint(endX + leftMargin, endY + topMargin);
+            drawSegment(painter, startPoint, endPoint, series->color());
+        }
+    }
+
+    painter->restore();
+}
+}

limereport/items/charts/lrgridlineschart.h

@@ -0,0 +1,17 @@
+#ifndef GRIDLINESCHART_H
+#define GRIDLINESCHART_H
+
+#include "lrlineschart.h"
+
+namespace LimeReport {
+class GridLinesChart : public LinesChart{
+public:
+    GridLinesChart(ChartItem* chartItem):LinesChart(chartItem){}
+    void paintChart(QPainter *painter, QRectF chartRect);
+
+private:
+    void paintSerialLines(QPainter *painter, QRectF barsRect);
+};
+}
+
+#endif // GRIDLINESCHART_H

limereport/items/lrchartitem.cpp

@@ -13,6 +13,7 @@
 #include "charts/lrverticalbarchart.h"
 #include "charts/lrhorizontalbarchart.h"
 #include "charts/lrlineschart.h"
+#include "charts/lrgridlineschart.h"
 
 namespace{
 
@@ -341,6 +342,10 @@ void ChartItem::setChartType(const ChartType &chartType)
             break;
         case Lines:
             m_chart = new LinesChart(this);
+            break;
+        case GridLines:
+            m_chart = new GridLinesChart(this);
+            break;
         }
         notify("chartType",oldValue,m_chartType);
         update();
@@ -612,8 +617,11 @@ void AbstractSeriesChart::updateMinAndMaxValues()
                 maxYValue = std::max(maxYValue, value);
             }
             if (series->data()->xAxisValues().isEmpty()) {
+                // Grid plot starts from 0 on x axis so x range must be decresed by 1
+                const bool startingFromZero = m_chartItem->chartType() == ChartItem::GridLines;
+                const qreal valuesCount = this->valuesCount() - (startingFromZero ? 1 : 0);
                 minXValue = std::min(0.0, minXValue);
-                maxXValue = std::max((qreal)valuesCount(), maxXValue);
+                maxXValue = std::max(valuesCount, maxXValue);
             } else {
                 for (qreal value : series->data()->xAxisValues()){
                     minXValue = std::min(value, minXValue);
@@ -785,7 +793,7 @@ void AbstractSeriesChart::paintVerticalGrid(QPainter *painter, QRectF gridRect)
         const qreal y = vStep * i;
         painter->drawText(QRectF(gridRect.bottomLeft()-QPointF(textPositionOffset,y+halfFontHeight),
                                  QSizeF(valuesHMargin,fontHeight)),
-                          verticalLabel(i, yAxisData.step(), yAxisData.rangeMin()),
+                          axisLabel(i, yAxisData),
                           verticalTextOption);
         painter->drawLine(gridRect.bottomLeft()-QPointF(-valuesHMargin,y),
                           gridRect.bottomRight()-QPointF(0,y));
@@ -794,6 +802,65 @@ void AbstractSeriesChart::paintVerticalGrid(QPainter *painter, QRectF gridRect)
     painter->setRenderHint(QPainter::Antialiasing,true);
 }
 
+void AbstractSeriesChart::paintGrid(QPainter *painter, QRectF gridRect)
+{
+    painter->save();
+
+    const AxisData &yAxisData = this->yAxisData();
+    const AxisData &xAxisData = this->xAxisData();
+
+    painter->setRenderHint(QPainter::Antialiasing,false);
+
+    const int xAxisSegmentCount = xAxisData.segmentCount();
+    const int xAxisLineCount = xAxisSegmentCount + 1;
+    const int yAxisSegmentCount = yAxisData.segmentCount();
+    const int yAxisLineCount = yAxisSegmentCount + 1;
+
+    const qreal gridOffset = hPadding(gridRect);
+    const int fontHeight = painter->fontMetrics().height();
+    const int halfFontHeight = fontHeight / 2;
+    const qreal valuesHMargin = this->valuesHMargin(painter);
+    const qreal vStep = gridRect.height() / yAxisSegmentCount;
+    const qreal hStep = (gridRect.width() - valuesHMargin - gridOffset) / xAxisSegmentCount;
+
+    // Vertical axis lines
+    const QTextOption verticalTextOption(Qt::AlignRight);
+    for (int i = 0 ; i < yAxisLineCount ; i++ ) {
+        const qreal y = vStep * i;
+        painter->drawText(QRectF(gridRect.bottomLeft()-QPointF(halfFontHeight, y + halfFontHeight),
+                                 QSizeF(valuesHMargin,fontHeight)),
+                          axisLabel(i, yAxisData),
+                          verticalTextOption);
+        painter->drawLine(gridRect.bottomLeft()-QPointF(-valuesHMargin, y),
+                          gridRect.bottomRight()-QPointF(0, y));
+    }
+
+    // Horizontal axis lines
+    for (int i = 0 ; i < xAxisLineCount ; i++) {
+        const qreal x = gridRect.left() + hStep * i + valuesHMargin + gridOffset;
+        const bool drawFullLine = i == 0 || i == xAxisSegmentCount;
+        const QString text = QString::number(xAxisData.rangeMin() + i * xAxisData.step());
+
+        if (m_chartItem->horizontalAxisOnTop()) {
+            painter->drawLine(x, gridRect.top() - gridOffset,
+                              x, (drawFullLine ? gridRect.bottom() : gridRect.top()));
+            painter->drawText(QRectF(x - painter->fontMetrics().width(text) / 2,
+                                     gridRect.top() - (fontHeight + gridOffset),
+                                     hStep, fontHeight),
+                              text);
+        } else {
+            painter->drawLine(x, gridRect.bottom() + gridOffset,
+                              x, (drawFullLine ? gridRect.top() : gridRect.bottom()));
+            painter->drawText(QRectF(x - painter->fontMetrics().width(text) / 2,
+                                     gridRect.bottom() + halfFontHeight + gridOffset,
+                                     hStep, fontHeight),
+                              text);
+        }
+    }
+
+    painter->restore();
+}
+
 void AbstractSeriesChart::drawSegment(QPainter *painter, QPoint startPoint, QPoint endPoint, QColor color)
 {
     int radius = m_chartItem->seriesLineWidth();
@@ -819,7 +886,7 @@ qreal AbstractSeriesChart::valuesHMargin(QPainter *painter)
     const int yAxisLineCount = yAxisData.segmentCount() + 1;
 
     for (int i = 0 ; i < yAxisLineCount ; i++) {
-        const QString label = verticalLabel(i, yAxisData.step(), yAxisData.rangeMin());
+        const QString label = axisLabel(i, yAxisData);
         max = std::max(max, (qreal)painter->fontMetrics().boundingRect(label).width()+offset);
     }
     return max;
@@ -869,14 +936,22 @@ QFont AbstractSeriesChart::adaptValuesFont(qreal width, QFont font)
     return tmpFont;
 }
 
-QString AbstractSeriesChart::verticalLabel(int i, qreal step, qreal min)
+QString AbstractSeriesChart::axisLabel(int i, const AxisData &axisData)
 {
-    qreal value = min + i * step;
+    const qreal min = axisData.rangeMin();
+    const qreal step = axisData.step();
+    qreal value = 0;
+    // For values below 0, axis is already reversed (value closer to 0 is higher)
+    if (axisData.reverseDirection() && min >= 0) {
+        value = min + (axisData.segmentCount() - i) * step;
+    } else {
+        value = min + i * step;
+    }
     if (std::floor(step) == step) {
         return QString::number(value);
     }
     // For float round numbers to small precision
-    return QString::number(value, 'g', 2);
+    return QString::number(round(value * 100.0) / 100.0);
 }
 
 void AbstractBarChart::paintChartLegend(QPainter *painter, QRectF legendRect)

limereport/items/lrchartitem.h

@@ -104,13 +104,14 @@ protected:
     virtual void paintHorizontalLabels(QPainter *painter, QRectF labelsRect);
     virtual void paintVerticalLabels(QPainter *painter, QRectF labelsRect);
     virtual void paintHorizontalGrid(QPainter *painter, QRectF gridRect);
+    virtual void paintGrid(QPainter *painter, QRectF gridRect);
     virtual void paintVerticalGrid(QPainter *painter, QRectF gridRect);
     virtual void drawSegment(QPainter *painter, QPoint startPoint, QPoint endPoint, QColor color);
     virtual qreal valuesHMargin(QPainter *painter);
     virtual qreal valuesVMargin(QPainter *painter);
     virtual QFont adaptLabelsFont(QRectF rect, QFont font);
     virtual QFont adaptValuesFont(qreal width, QFont font);
-    virtual QString verticalLabel(int i, qreal step, qreal min);
+    virtual QString axisLabel(int i, const AxisData &axisData);
 
 private:
     AxisData m_yAxisData, m_xAxisData;
@@ -148,8 +149,9 @@ class ChartItem : public LimeReport::ItemDesignIntf
 public:
 
     enum LegendAlign{LegendAlignTop,LegendAlignCenter,LegendAlignBottom};
+    enum LegendStyle{LegendPoints, LegendLines};
     enum TitleAlign{TitleAlignLeft, TitleAlignCenter, TitleAlignRight};
-    enum ChartType{Pie, VerticalBar, HorizontalBar, Lines};
+    enum ChartType{Pie, VerticalBar, HorizontalBar, Lines, GridLines};
 #if QT_VERSION >= 0x050500
     Q_ENUM(LegendAlign)
     Q_ENUM(TitleAlign)

limereport/limereport.pri

@@ -49,6 +49,7 @@ SOURCES += \
     $$REPORT_PATH/items/lrchartitemeditor.cpp \
     $$REPORT_PATH/items/charts/lrhorizontalbarchart.cpp \
     $$REPORT_PATH/items/charts/lrlineschart.cpp \
+    $$REPORT_PATH/items/charts/lrgridlineschart.cpp \
     $$REPORT_PATH/items/charts/lrpiechart.cpp \
     $$REPORT_PATH/items/charts/lrverticalbarchart.cpp \
     $$REPORT_PATH/lrbanddesignintf.cpp \
@@ -132,6 +133,7 @@ HEADERS += \
     $$REPORT_PATH/items/lrchartitemeditor.h \
     $$REPORT_PATH/items/charts/lrhorizontalbarchart.h \
     $$REPORT_PATH/items/charts/lrlineschart.h \
+    $$REPORT_PATH/items/charts/lrgridlineschart.h \
     $$REPORT_PATH/items/charts/lrpiechart.h \
     $$REPORT_PATH/items/charts/lrverticalbarchart.h \
     $$REPORT_PATH/lrbanddesignintf.h \