Merge pull request #373 from emil-sawicki9/feature/drawing-chart-refactoring

Refactor axis data. Remove duplicate paint code

limereport/items/charts/lrhorizontalbarchart.cpp

@@ -36,8 +36,8 @@ void HorizontalBarChart::paintHorizontalBars(QPainter *painter, QRectF barsRect)
 
     painter->save();
     painter->setRenderHint(QPainter::Antialiasing,false);
-    int delta = int(maxValue()-minValue());
-    delta = genNextValue(delta);
+    const AxisData &yAxisData = this->yAxisData();
+    const qreal delta = yAxisData.delta();
 
     qreal vStep = (barsRect.height()-painter->fontMetrics().height()) / valuesCount() / seriesCount();
     qreal hStep = (barsRect.width()-painter->fontMetrics().boundingRect(QString::number(maxValue())).width()) / delta;

limereport/items/charts/lrlineschart.cpp

@@ -68,35 +68,70 @@ void LinesChart::drawDesignMode(QPainter* painter, qreal hStep, qreal vStep, qre
     }
 }
 
+qreal LinesChart::calculateValueYPos(qreal, qreal max, qreal value, qreal delta, qreal height)
+{
+    return (max - value) / delta * height;
+}
+
+void LinesChart::paintSeries(QPainter *painter, SeriesItem *series, QRectF barsRect)
+{
+    const AxisData &yAxisData = this->yAxisData();
+    const qreal delta = yAxisData.delta();
+
+    const qreal hStep = barsRect.width() / valuesCount();
+    const qreal topMargin = barsRect.top();
+
+    QPen pen(series->color());
+    pen.setWidth(4);
+    painter->setPen(pen);
+
+    const QList<qreal> &values = series->data()->values();
+
+    qreal lastYValue = 0;
+    qreal lastXValue = barsRect.left() + hStep/2;
+    if (!values.isEmpty()) {
+        // Calculate first point position on plot before loop
+        lastYValue = calculateValueYPos(yAxisData.rangeMin(), yAxisData.rangeMax(), values.first(), delta, barsRect.height());
+    }
+    for (int i = 0; i < values.count()-1; ++i ){
+        const qreal startY = lastYValue;
+        const qreal endY = calculateValueYPos(yAxisData.rangeMin(), yAxisData.rangeMax(), values.at(i+1), delta, barsRect.height());
+        // Record last used Y position to only calculate new one
+        lastYValue = endY;
+
+        const qreal startX = lastXValue;
+        const qreal endX = startX + hStep;
+        // Record last used X position to only calculate new one
+        lastXValue = endX;
+
+        QPoint startPoint = QPoint(startX, startY + topMargin);
+        QPoint endPoint = QPoint(endX, endY + topMargin);
+        drawSegment(painter, startPoint, endPoint, series->color());
+    }
+}
+
 void LinesChart::paintSerialLines(QPainter* painter, QRectF barsRect)
 {
     if (valuesCount() == 0) return;
 
     painter->save();
     painter->setRenderHint(QPainter::Antialiasing,true);
-    int delta = int(maxValue() - minValue());
-    delta = genNextValue(delta);
 
-    qreal vStep = barsRect.height() / delta;
-    qreal hStep = barsRect.width() / valuesCount();
-    qreal topShift = (delta - (maxValue() - minValue())) * vStep +barsRect.top();
-
-    if (m_chartItem->itemMode() != DesignMode){
-        foreach (SeriesItem* series, m_chartItem->series()) {
-            QPen pen(series->color());
-            pen.setWidth(4);
-            painter->setPen(pen);
-            for (int i = 0; i < series->data()->values().count()-1; ++i ){
-                QPoint startPoint = QPoint((i+1) * hStep + barsRect.left() - hStep/2,
-                                           (maxValue()*vStep+topShift) - series->data()->values().at(i) * vStep);
-                QPoint endPoint = QPoint((i+2) * hStep + barsRect.left() - hStep/2,
-                                         (maxValue() * vStep+topShift) - series->data()->values().at(i+1) * vStep);
-                drawSegment(painter, startPoint, endPoint, series->color());
-            }
-        }
-    } else {
+    if (m_chartItem->itemMode() == DesignMode){
+        const AxisData &yAxisData = this->yAxisData();
+        const qreal delta = yAxisData.delta();
+        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;
     }
+
+    for (SeriesItem *series : m_chartItem->series()) {
+        paintSeries(painter, series, barsRect);
+    }
+
     painter->restore();
 }
 

limereport/items/charts/lrlineschart.h

@@ -8,9 +8,13 @@ class LinesChart: public AbstractBarChart{
 public:
     LinesChart(ChartItem* chartItem):AbstractBarChart(chartItem){}
     void paintChart(QPainter *painter, QRectF chartRect);
+protected:
+    void drawDesignMode(QPainter *painter, qreal hStep, qreal vStep, qreal topShift, QRectF barsRect);
+    qreal calculateValueYPos(qreal min, qreal max, qreal value, qreal delta, qreal height);
+    void paintSeries(QPainter *painter, SeriesItem *series, QRectF barsRect);
+
 private:
     void paintSerialLines(QPainter *painter, QRectF barsRect);
-    void drawDesignMode(QPainter *painter, qreal hStep, qreal vStep, qreal topShift, QRectF barsRect);
 };
 }
 

limereport/items/charts/lrverticalbarchart.cpp

@@ -54,8 +54,8 @@ void VerticalBarChart::paintVerticalBars(QPainter *painter, QRectF barsRect)
 
     if (valuesCount() == 0) return;
 
-    int delta = int(maxValue() - minValue());
-    delta = genNextValue(delta);
+    const AxisData &yAxisData = this->yAxisData();
+    const qreal delta = yAxisData.delta();
 
     int barSeriesCount = 0;
     foreach(SeriesItem* series, m_chartItem->series()){
@@ -102,30 +102,14 @@ void VerticalBarChart::paintVerticalBars(QPainter *painter, QRectF barsRect)
 
 void VerticalBarChart::paintSerialLines(QPainter* painter, QRectF barsRect)
 {
-    if (valuesCount() == 0 ) return;
+    if (valuesCount() == 0 || m_chartItem->series().isEmpty() ) return;
 
     painter->save();
     painter->setRenderHint(QPainter::Antialiasing,true);
-    int delta = int(maxValue() - minValue());
-    delta = genNextValue(delta);
 
-    qreal vStep = barsRect.height() / delta;
-    qreal hStep = (barsRect.width() / valuesCount());
-    qreal topShift = (delta - (maxValue()-minValue())) * vStep + barsRect.top();
-
-    if (!m_chartItem->series().isEmpty()){
-        foreach (SeriesItem* series, m_chartItem->series()) {
+    for (SeriesItem *series : m_chartItem->series()) {
         if (series->preferredType() == SeriesItem::Line){
-                for (int i = 0; i < series->data()->values().count()-1; ++i ){
-                    QPoint startPoint = QPoint((i+1)*hStep + barsRect.left()-hStep/2,
-                                               (maxValue() * vStep+topShift) - series->data()->values().at(i) * vStep
-                                               );
-                    QPoint endPoint = QPoint((i+2)*hStep + barsRect.left()-hStep/2,
-                                             (maxValue() * vStep+topShift) - series->data()->values().at(i+1) * vStep
-                                             );
-                    drawSegment(painter, startPoint, endPoint, series->color());
-                }
-            }
+            paintSeries(painter, series, barsRect);
         }
     }
     painter->restore();

limereport/items/charts/lrverticalbarchart.h

@@ -1,13 +1,13 @@
 #ifndef VERTICALBARCHART_H
 #define VERTICALBARCHART_H
 
-#include "lrchartitem.h"
+#include "lrlineschart.h"
 
 namespace LimeReport{
 
-class VerticalBarChart: public AbstractBarChart{
+class VerticalBarChart: public LinesChart{
 public:
-    VerticalBarChart(ChartItem* chartItem):AbstractBarChart(chartItem){}
+    VerticalBarChart(ChartItem* chartItem):LinesChart(chartItem){}
     void paintChart(QPainter *painter, QRectF chartRect);
 //    void paintVerticalGrid(QPainter *painter, QRectF gridRect);
     void paintVerticalBars(QPainter *painter, QRectF barsRect);

limereport/items/lrchartitem.cpp

@@ -130,7 +130,7 @@ ChartItem::ChartItem(QObject *owner, QGraphicsItem *parent)
     : ItemDesignIntf(xmlTag, owner, parent), m_legendBorder(true),
       m_legendAlign(LegendAlignCenter), m_titleAlign(TitleAlignCenter),
       m_chartType(Pie), m_labelsField(""), m_isEmpty(true),
-      m_showLegend(true)
+      m_showLegend(true), m_drawPoints(true), m_seriesLineWidth(4)
 {
     m_labels<<"First"<<"Second"<<"Thrid";
     m_chart = new PieChart(this);
@@ -433,6 +433,37 @@ bool ChartItem::isSeriesExists(const QString &name)
     return false;
 }
 
+int ChartItem::seriesLineWidth() const
+{
+    return m_seriesLineWidth;
+}
+
+bool ChartItem::drawPoints() const
+{
+    return m_drawPoints;
+}
+
+void ChartItem::setDrawPoints(bool drawPoints)
+{
+    if (m_drawPoints != drawPoints){
+        m_drawPoints = drawPoints;
+        notify("drawPoints", !m_drawPoints, m_drawPoints);
+        update();
+    }
+    m_drawPoints = drawPoints;
+}
+
+void ChartItem::setSeriesLineWidth(int newSeriesLineWidth)
+{
+    if (m_seriesLineWidth != newSeriesLineWidth){
+        int oldValue = m_seriesLineWidth;
+        m_seriesLineWidth = newSeriesLineWidth;
+        notify("seriesLineWidth", oldValue, m_seriesLineWidth);
+        update();
+    }
+    m_seriesLineWidth = newSeriesLineWidth;
+}
+
 AbstractChart::AbstractChart(ChartItem *chartItem)
     :m_chartItem(chartItem)
 {
@@ -492,14 +523,6 @@ void AbstractChart::prepareLegendToPaint(QRectF &legendRect, QPainter *painter)
     }
 }
 
-int genNextValue(int value){
-    int curValue = value;
-    while (curValue % 4 != 0){
-        curValue++;
-    }
-    return curValue;
-}
-
 AbstractSeriesChart::AbstractSeriesChart(ChartItem *chartItem)
     :AbstractChart(chartItem)
 {
@@ -516,29 +539,35 @@ AbstractSeriesChart::AbstractSeriesChart(ChartItem *chartItem)
 
 qreal AbstractSeriesChart::maxValue()
 {
-    return m_maxValue;
+    return m_yAxisData.maxValue();
 }
 
 qreal AbstractSeriesChart::minValue()
 {
-    return m_minValue;
+    return m_yAxisData.minValue();
+}
+
+AxisData AbstractSeriesChart::yAxisData()
+{
+    return m_yAxisData;
 }
 
 void AbstractSeriesChart::updateMinAndMaxValues()
 {
+    qreal maxYValue = 0;
+    qreal minYValue = 0;
     if (m_chartItem->itemMode() == DesignMode) {
-        m_maxValue = 40;
-        m_minValue = 0;
-        return;
-    }
-    m_minValue = 0;
-    m_maxValue = 0;
-    foreach(SeriesItem* series, m_chartItem->series()){
-        foreach(qreal value, series->data()->values()){
-            if (value<m_minValue) m_minValue=value;
-            if (value>m_maxValue) m_maxValue=value;
+        maxYValue = 40;
+    } else {
+        for (SeriesItem* series : m_chartItem->series()){
+            for (qreal value : series->data()->values()){
+                minYValue = std::min(minYValue, value);
+                maxYValue = std::max(maxYValue, value);
             }
         }
+    }
+
+    m_yAxisData = AxisData(minYValue, maxYValue);
 }
 
 qreal AbstractSeriesChart::hPadding(QRectF chartRect)
@@ -655,18 +684,22 @@ void AbstractSeriesChart::paintVerticalLabels(QPainter *painter, QRectF labelsRe
 void AbstractSeriesChart::paintHorizontalGrid(QPainter *painter, QRectF gridRect)
 {
     painter->save();
-    int delta = int(maxValue() - minValue());
-    delta = genNextValue(delta);
+
+    const AxisData &yAxisData = this->yAxisData();
+    const qreal delta = yAxisData.delta();
+
+    const int segmentCount = yAxisData.segmentCount();
+    const int lineCount = segmentCount + 1;
 
     painter->setRenderHint(QPainter::Antialiasing,false);
-    qreal hStep = (gridRect.width() - painter->fontMetrics().boundingRect(QString::number(maxValue())).width()) / 4;
+    qreal hStep = (gridRect.width() - painter->fontMetrics().boundingRect(QString::number(maxValue())).width()) / segmentCount;
 
     painter->setFont(adaptValuesFont(hStep-4, painter->font()));
 
-    for (int i=0;i<5;i++){
+    for (int i = 0 ; i < lineCount ; i++ ) {
         painter->drawText(QRectF(gridRect.left() + 4 + hStep * i, gridRect.bottom() - painter->fontMetrics().height(),
                                  hStep, painter->fontMetrics().height()),
-                          QString::number(minValue() + i * delta / 4));
+                          QString::number(minValue() + i * delta / segmentCount));
         painter->drawLine( gridRect.left()+hStep*i, gridRect.bottom(),
                           gridRect.left()+hStep*i, gridRect.top());
 
@@ -676,20 +709,28 @@ void AbstractSeriesChart::paintHorizontalGrid(QPainter *painter, QRectF gridRect
 
 void AbstractSeriesChart::paintVerticalGrid(QPainter *painter, QRectF gridRect)
 {
-    int delta = int(maxValue()-minValue());
-    delta = genNextValue(delta);
+    const AxisData &yAxisData = this->yAxisData();
 
     painter->setRenderHint(QPainter::Antialiasing,false);
-    qreal vStep = gridRect.height() / 4;
+
+    const int segmentCount = yAxisData.segmentCount();
+    const int lineCount = segmentCount + 1;
+    qreal vStep = gridRect.height() / segmentCount;
 
     const qreal valuesHMargin = this->valuesHMargin(painter);
+    const int fontHeight = painter->fontMetrics().height();
+    const int halfFontHeight = fontHeight / 2;
+    const qreal textPositionOffset = valuesHMargin * 0.2;
 
-    for (int i=0;i<5;i++){
-        painter->drawText(QRectF(gridRect.bottomLeft()-QPointF(0,vStep*i+painter->fontMetrics().height()),
-                                 QSizeF(valuesHMargin,painter->fontMetrics().height())),
-                          QString::number(minValue()+i*delta/4));
-        painter->drawLine(gridRect.bottomLeft()-QPointF(-valuesHMargin,vStep*i),
-                          gridRect.bottomRight()-QPointF(0,vStep*i));
+    const QTextOption verticalTextOption(Qt::AlignRight);
+    for (int i = 0 ; i < lineCount ; i++ ) {
+        const qreal y = vStep * i;
+        painter->drawText(QRectF(gridRect.bottomLeft()-QPointF(textPositionOffset,y+halfFontHeight),
+                                 QSizeF(valuesHMargin,fontHeight)),
+                          verticalLabel(i, yAxisData.step(), yAxisData.rangeMin()),
+                          verticalTextOption);
+        painter->drawLine(gridRect.bottomLeft()-QPointF(-valuesHMargin,y),
+                          gridRect.bottomRight()-QPointF(0,y));
     }
 
     painter->setRenderHint(QPainter::Antialiasing,true);
@@ -697,11 +738,14 @@ void AbstractSeriesChart::paintVerticalGrid(QPainter *painter, QRectF gridRect)
 
 void AbstractSeriesChart::drawSegment(QPainter *painter, QPoint startPoint, QPoint endPoint, QColor color)
 {
-    int radius = 4;
+    int radius = m_chartItem->seriesLineWidth();
     QPen pen(color);
     pen.setWidth(radius);
     painter->setPen(pen);
     painter->drawLine(startPoint, endPoint);
+    if (!m_chartItem->drawPoints()) {
+        return;
+    }
     QRect startPointRect(startPoint,startPoint);
     QRect endPointRect(endPoint,endPoint);
     painter->setBrush(color);
@@ -711,9 +755,16 @@ void AbstractSeriesChart::drawSegment(QPainter *painter, QPoint startPoint, QPoi
 
 qreal AbstractSeriesChart::valuesHMargin(QPainter *painter)
 {
-    int delta = int(maxValue()-minValue());
-    delta = genNextValue(delta);
-    return painter->fontMetrics().boundingRect(QString::number(delta)).width()+4;
+    qreal max = 0;
+    const AxisData &yAxisData = this->yAxisData();
+    const int offset = 4;
+    const int yAxisLineCount = yAxisData.segmentCount() + 1;
+
+    for (int i = 0 ; i < yAxisLineCount ; i++) {
+        const QString label = verticalLabel(i, yAxisData.step(), yAxisData.rangeMin());
+        max = std::max(max, (qreal)painter->fontMetrics().boundingRect(label).width()+offset);
+    }
+    return max;
 }
 
 qreal AbstractSeriesChart::valuesVMargin(QPainter *painter)
@@ -760,6 +811,16 @@ QFont AbstractSeriesChart::adaptValuesFont(qreal width, QFont font)
     return tmpFont;
 }
 
+QString AbstractSeriesChart::verticalLabel(int i, qreal step, qreal min)
+{
+    qreal 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);
+}
+
 void AbstractBarChart::paintChartLegend(QPainter *painter, QRectF legendRect)
 {
     prepareLegendToPaint(legendRect, painter);
@@ -836,5 +897,4 @@ QRectF AbstractBarChart::horizontalLabelsRect(QPainter *painter, QRectF labelsRe
     else
         return labelsRect.adjusted(0, (labelsRect.height() - maxWidth), 0, 0);
 }
-
 } // namespace LimeReport

limereport/items/lrchartitem.h

@@ -2,6 +2,7 @@
 #define LRCHARTITEM_H
 #include "lritemdesignintf.h"
 #include "lrglobal.h"
+#include "lraxisdata.h"
 #include <QtGlobal>
 
 namespace LimeReport{
@@ -85,6 +86,7 @@ public:
 protected:
     qreal maxValue();
     qreal minValue();
+    AxisData yAxisData();
     void updateMinAndMaxValues();
     int valuesCount();
     int seriesCount();
@@ -102,14 +104,13 @@ protected:
     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);
 
 private:
-    qreal m_minValue = 0, m_maxValue = 0;
+    AxisData m_yAxisData;
     qreal m_designValues [9];
 };
 
-int genNextValue(int value);
-
 class AbstractBarChart: public AbstractSeriesChart{
 public:
     AbstractBarChart(ChartItem* chartItem):AbstractSeriesChart(chartItem){}
@@ -131,6 +132,10 @@ class ChartItem : public LimeReport::ItemDesignIntf
     Q_PROPERTY(ChartType chartType READ chartType WRITE setChartType)
     Q_PROPERTY(QString labelsField READ labelsField WRITE setLabelsField)
     Q_PROPERTY(bool showLegend READ showLegend WRITE setShowLegend)
+
+    //linesChart
+    Q_PROPERTY(bool drawPoints READ drawPoints WRITE setDrawPoints)
+    Q_PROPERTY(int seriesLineWidth READ seriesLineWidth WRITE setSeriesLineWidth)
     friend class AbstractChart;
 public:
 
@@ -183,6 +188,12 @@ public:
     bool showLegend() const;
     void setShowLegend(bool showLegend);
 
+    bool drawPoints() const;
+    void setDrawPoints(bool drawPoints);
+
+    int seriesLineWidth() const;
+    void setSeriesLineWidth(int newSeriesLineWidth);
+
 protected:
     void paintChartTitle(QPainter* painter, QRectF titleRect);
     virtual BaseDesignIntf* createSameTypeItem(QObject *owner, QGraphicsItem *parent);
@@ -209,7 +220,8 @@ private:
     QList<QString> m_labels;
     bool m_isEmpty;
     bool m_showLegend;
+    bool m_drawPoints;
+    int m_seriesLineWidth;
 };
-
 } //namespace LimeReport
 #endif // LRCHARTITEM_H

limereport/limereport.pri

@@ -75,6 +75,7 @@ SOURCES += \
     $$REPORT_PATH/lrcolorindicator.cpp \
     $$REPORT_PATH/lrreporttranslation.cpp \
     $$REPORT_PATH/exporters/lrpdfexporter.cpp \
+    $$REPORT_PATH/lraxisdata.cpp \
     $$REPORT_PATH/lrpreparedpages.cpp
 
 CONFIG(staticlib) {
@@ -170,6 +171,7 @@ HEADERS += \
     $$REPORT_PATH/lrexportersfactory.h \	
     $$REPORT_PATH/exporters/lrpdfexporter.h \
     $$REPORT_PATH/lrpreparedpages.h \
+    $$REPORT_PATH/lraxisdata.h \
     $$REPORT_PATH/lrpreparedpagesintf.h 
 
 CONFIG(staticlib) {

limereport/lraxisdata.cpp

@@ -0,0 +1,68 @@
+#include "lraxisdata.h"
+
+namespace LimeReport {
+AxisData::AxisData()
+    : m_rangeMin(0), m_rangeMax(0),
+      m_minValue(0), m_maxValue(0), m_step(0),
+      m_delta(0), m_segmentCount(4)
+{
+
+}
+
+AxisData::AxisData(qreal minValue, qreal maxValue)
+    : AxisData()
+{
+    m_minValue = minValue;
+    m_maxValue = maxValue;
+    calculateValuesAboveMax(minValue, maxValue, 4);
+    m_delta = m_step * m_segmentCount;
+}
+
+int AxisData::segmentCount() const
+{
+    return m_segmentCount;
+}
+
+qreal AxisData::rangeMin() const
+{
+    return m_rangeMin;
+}
+
+qreal AxisData::rangeMax() const
+{
+    return m_rangeMax;
+}
+
+qreal AxisData::minValue() const
+{
+    return m_minValue;
+}
+
+qreal AxisData::maxValue() const
+{
+    return m_maxValue;
+}
+
+qreal AxisData::step() const
+{
+    return m_step;
+}
+
+qreal AxisData::delta() const
+{
+    return m_delta;
+}
+
+void AxisData::calculateValuesAboveMax(qreal minValue, qreal maxValue, int segments)
+{
+    const int delta = maxValue - minValue;
+    int max = delta;
+    while (max % segments != 0){
+        max++;
+    }
+    m_rangeMax = max;
+    m_step = max / segments;
+    m_rangeMin = minValue;
+    m_segmentCount = segments;
+}
+}

limereport/lraxisdata.h

@@ -0,0 +1,37 @@
+#ifndef AXISDATA_H
+#define AXISDATA_H
+
+#include <QtGlobal>
+
+namespace LimeReport {
+class AxisData
+{
+public:
+    AxisData();
+    AxisData(qreal minValue, qreal maxValue);
+
+    int segmentCount() const;
+
+    qreal rangeMin() const;
+    qreal rangeMax() const;
+
+    qreal minValue() const;
+    qreal maxValue() const;
+    qreal step() const;
+
+    qreal delta() const;
+private:
+    void calculateValuesAboveMax(qreal minValue, qreal maxValue, int segments);
+    qreal calculateNiceNum(qreal range, bool round);
+
+    qreal m_rangeMin;
+    qreal m_rangeMax;
+    qreal m_minValue;
+    qreal m_maxValue;
+    qreal m_step;
+    qreal m_delta;
+    int m_segmentCount;
+};
+};
+
+#endif // AXISDATA_H

limereport/objectinspector/lrobjectitemmodel.cpp

@@ -165,6 +165,8 @@ void QObjectPropertyModel::translatePropertyName()
     tr("printBehavior");
     tr("shiftItems");
     tr("showLegend");
+    tr("seriesLineWidth");
+    tr("drawPoints");
     tr("removeGap");
     tr("dropPrinterMargins");
     tr("notPrintIfEmpty");