這里只點名一點：

Qt Charts是利用Qt的圖形視圖框架（QGraphics）搞出來的，底層并不是用OPenGL，而QML卻與OPenGL的底層緊密關聯

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運行截圖如下：

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源碼如下：

widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget>namespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();public slots:void addBtnClicked();void reduceBtnClicked();private:Ui::Widget *ui; };#endif // WIDGET_H

main.cpp

#include "widget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);Widget w;w.show();return a.exec(); }

widget.cpp

#include "widget.h" #include "ui_widget.h"Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget) {ui->setupUi(this);ui->quickWidget->setSource(QUrl("qrc:/chart.qml"));QObject *pRoot = (QObject*)ui->quickWidget->rootObject();Q_ASSERT(pRoot);connect(ui->addPushButton,SIGNAL(clicked()),pRoot,SIGNAL(addEaten()));connect(ui->reducePushButton,SIGNAL(clicked()),pRoot,SIGNAL(reduceEaten())); }Widget::~Widget() {delete ui; }void Widget::addBtnClicked() {ui->quickWidget->update(); }void Widget::reduceBtnClicked() {ui->quickWidget->update(); }

chart.qml

import QtQuick 2.0 import QtCharts 2.0Rectangle {id: rootChartView {width: parent.widthheight: parent.heighttheme: ChartView.ChartThemeBrownSandantialiasing: truePieSeries {id: pieSeriesPieSlice { id: eaten; label: "eaten"; value: 94.9 }PieSlice { id: unEaten; label: "not yet eaten"; value: 5.1 }}}signal addEatensignal reduceEatenonAddEaten: {eaten.value += 1.5unEaten.value -= 1.5}onReduceEaten: {eaten.value -= 1.5unEaten.value += 1.5}}

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總結

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