From c7c3c4960b214516088eaeb2afc06885c376d5e6 2012-01-25 14:41:48
From: Michal Klocek <michal.klocek@digia.com>
Date: 2012-01-25 14:41:48
Subject: [PATCH] Add background to chart
 * adds QGraphicsRectItem as background item
 * setters for color
 * example colorlinechart

---

diff --git a/example/colorlinechart/colorlinechart.pro b/example/colorlinechart/colorlinechart.pro
new file mode 100644
index 0000000..784936a
--- /dev/null
+++ b/example/colorlinechart/colorlinechart.pro
@@ -0,0 +1,15 @@
+!include( ../../common.pri ) {
+ error( "Couldn't find the common.pri file!" )
+}
+
+!include( ../../integrated.pri ) {
+ error( "Couldn't find the integrated.pri file !")
+}
+
+TARGET = colorlineChart
+TEMPLATE = app
+QT += core gui
+SOURCES += main.cpp
+
+
+
diff --git a/example/colorlinechart/main.cpp b/example/colorlinechart/main.cpp
new file mode 100644
index 0000000..5b8a53b
--- /dev/null
+++ b/example/colorlinechart/main.cpp
@@ -0,0 +1,40 @@
+#include <QApplication>
+#include <QMainWindow>
+#include <qchartview.h>
+#include <qxychartseries.h>
+#include <qchart.h>
+#include <cmath>
+
+QTCOMMERCIALCHART_USE_NAMESPACE
+
+#define PI 3.14159265358979
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+
+    QMainWindow window;
+
+    QXYChartSeries* series0 = QXYChartSeries::create();
+    series0->setColor(Qt::blue);
+    QXYChartSeries* series1 = QXYChartSeries::create();
+    series1->setColor(Qt::red);
+
+    int numPoints = 100;
+
+    for (int x = 0; x <= numPoints; ++x) {
+    	  series0->add(x, abs(sin(PI/50*x)*100));
+    	  series1->add(x, abs(cos(PI/50*x)*100));
+    }
+
+    QChartView* chartView =  new QChartView(&window);
+    chartView->addSeries(series0);
+    chartView->addSeries(series1);
+    chartView->setBackgroundColor(Qt::yellow);
+
+    window.setCentralWidget(chartView);
+    window.resize(400, 300);
+    window.show();
+
+    return a.exec();
+}
diff --git a/example/example.pro b/example/example.pro
index 8930819..c358c53 100644
--- a/example/example.pro
+++ b/example/example.pro
@@ -1,3 +1,4 @@
 TEMPLATE = subdirs
 SUBDIRS += linechart \
-           zoomlinechart
+           zoomlinechart \
+           colorlinechart
diff --git a/src/qchart.cpp b/src/qchart.cpp
index e6c888b..c16e0f0 100644
--- a/src/qchart.cpp
+++ b/src/qchart.cpp
@@ -17,6 +17,8 @@
 QTCOMMERCIALCHART_BEGIN_NAMESPACE
 
 QChart::QChart(QGraphicsObject* parent) : QGraphicsObject(parent),
+    m_background(new QGraphicsRectItem(this)),
+    m_title(new QGraphicsTextItem(this)),
     m_axisX(new AxisItem(AxisItem::X_AXIS,this)),
     m_axisY(new AxisItem(AxisItem::Y_AXIS,this)),
     m_plotDataIndex(0),
@@ -146,6 +148,13 @@ void QChart::setSize(const QSize& size)
     m_rect = QRect(QPoint(0,0),size);
     QRect rect = m_rect.adjusted(margin(),margin(), -margin(), -margin());
 
+
+    //recalculate background gradient
+    m_background->setRect(rect);
+    m_backgroundGradient.setFinalStop(0,m_background->rect().height());
+    m_background->setBrush(m_backgroundGradient);
+
+    //resize elements
     foreach (ChartItem* item ,m_chartItems) {
         item->setPos(rect.topLeft());
         item->setSize(rect.size());
@@ -160,6 +169,20 @@ void QChart::setSize(const QSize& size)
     update();
 }
 
+void QChart::setBackgroundColor(const QColor& color)
+{
+    m_backgroundGradient.setColorAt( 0.0, Qt::white);
+    m_backgroundGradient.setColorAt( 1.0, color);
+    m_background->setBrush(m_backgroundGradient);
+    m_background->setPen(Qt::NoPen);
+    m_background->update();
+}
+
+void QChart::setTitle(const QString& title)
+{
+    m_title->setPlainText(title);
+}
+
 int QChart::margin() const
 {
     return m_marginSize;
diff --git a/src/qchart.h b/src/qchart.h
index fc47cdd..a2a85dc 100644
--- a/src/qchart.h
+++ b/src/qchart.h
@@ -4,6 +4,7 @@
 #include <qchartglobal.h>
 #include <qchartseries.h>
 #include <QGraphicsObject>
+#include <QLinearGradient>
 
 QTCOMMERCIALCHART_BEGIN_NAMESPACE
 
@@ -49,6 +50,9 @@ public:
     int margin() const;
     void setTheme(QChart::ChartTheme theme);
 
+    void setTitle(const QString& title);
+    void setBackgroundColor(const QColor& color);
+
     void zoomInToRect(const QRect& rectangle);
     void zoomIn();
     void zoomOut();
@@ -60,6 +64,9 @@ signals:
 
 private:
     Q_DISABLE_COPY(QChart)
+    QGraphicsRectItem* m_background;
+    QLinearGradient m_backgroundGradient;
+    QGraphicsTextItem* m_title;
     AxisItem* m_axisX;
     AxisItem* m_axisY;
     QRect m_rect;
@@ -71,7 +78,6 @@ private:
     int m_plotDataIndex;
     int m_marginSize;
     QList<QColor> m_themeColors;
-
     QList<BarGroup*> m_BarGroupItems;
 };
 
diff --git a/src/qchartview.cpp b/src/qchartview.cpp
index bab01c4..5ec3e58 100644
--- a/src/qchartview.cpp
+++ b/src/qchartview.cpp
@@ -63,4 +63,15 @@ int QChartView::margin() const
 {
     return m_chart->margin();
 }
+
+void QChartView::setTitle(const QString& title)
+{
+    m_chart->setTitle(title);
+}
+
+void QChartView::setBackgroundColor(const QColor& color)
+{
+    m_chart->setBackgroundColor(color);
+}
+
 QTCOMMERCIALCHART_END_NAMESPACE
diff --git a/src/qchartview.h b/src/qchartview.h
index 3dc64ab..68cde12 100644
--- a/src/qchartview.h
+++ b/src/qchartview.h
@@ -25,6 +25,8 @@ public:
     QChartSeries* createSeries(QChartSeries::QChartSeriesType type);
 
     int margin() const;
+    void setTitle(const QString& title);
+    void setBackgroundColor(const QColor& color);
     void zoomInToRect(const QRect& rectangle);
     void zoomIn();
     void zoomOut();