project(LinuxQtExample)

# 设置c++语言标准，我使用c++17
set(CMAKE_CXX_STANDARD 17)

cmake_minimum_required (VERSION 3.10)

set(CMAKE_INCLUDE_CURRENT_DIR ON)

# 自动调用moc, uic, rcc
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTORCC ON)

# 找到这些Qt组件
find_package(Qt5Widgets REQUIRED)
find_package(Qt5Core REQUIRED)
find_package(Qt5Gui REQUIRED)
find_package(Qt5Charts REQUIRED)

# 将源代码添加到此项目的可执行文件。
add_executable (LinuxQt "main.cpp")

# 将Qt的库链接至程序
target_link_libraries(LinuxQt Qt5::Core Qt5::Widgets Qt5::Gui Qt5::Charts)

#include QApplication>
#include QBarCategoryAxis>
#include QBarSet>
#include QBarSeries>
#include QChart>
#include QChartView>
#include QPushButton>
#include QString>
#include QStringList>
#include QValueAxis>
#include QVBoxLayout>

#include iostream>
#include random>

// 这个函数里变量名起的很烂，因为是示例我偷懒了，请你不要在实际项目中写出这种代码
// 创建柱状图数据的函数
// std::random_device的某些实现在Windows上存在bug，每次运行会返回同样的结果序列，linux没问题
// QtCharts的所有类型/函数都在对应的命名空间中，和其他的QtWidgets不同
static QtCharts::QBarSeries* createSeries()
{
	auto dataSet1 = new QtCharts::QBarSet("mt19937");
	auto seed = std::random_device{}();
	std::uniform_int_distributionint> u(0, 100);
	std::mt19937 rd1(seed);
	for (int i = 0; i  10; ++i) {
		auto a = u(rd1);
		std::cout  a  std::endl;
		*dataSet1  a;
	}

	auto dataSet2 = new QtCharts::QBarSet("minstd_rand");
	std::minstd_rand rd2(seed);
	for (int i = 0; i  10; ++i) {
		auto a = u(rd2);
		std::cout  a  std::endl;
		*dataSet2  a;
	}

	auto dataSet3 = new QtCharts::QBarSet("default");
	std::default_random_engine rd3(seed);
	for (int i = 0; i  10; ++i) {
		auto a = u(rd3);
		std::cout  a  std::endl;
		*dataSet3  a;
	}

	auto dataSet4 = new QtCharts::QBarSet("ranlux48");
	std::ranlux48 rd4(seed);
	for (int i = 0; i  10; ++i) {
		auto a = u(rd4);
		std::cout  a  std::endl;
		*dataSet4  a;
	}

	auto dataSet5 = new QtCharts::QBarSet("knuth_b");
	std::knuth_b rd5(seed);
	for (int i = 0; i  10; ++i) {
		auto a = u(rd5);
		std::cout  a  std::endl;
		*dataSet5  a;
	}

	auto barSeries = new QtCharts::QBarSeries;
	barSeries->append(dataSet1);
	barSeries->append(dataSet2);
	barSeries->append(dataSet3);
	barSeries->append(dataSet4);
	barSeries->append(dataSet5);
	return barSeries;
}

int main(int argc, char* argv[])
{
	QApplication app(argc, argv);
	auto chart = new QtCharts::QChart;

	// 创建Y轴显示数据
	auto axisY = new QtCharts::QValueAxis;
	axisY->setRange(0, 100);
	axisY->setTickCount(10);
	axisY->setTitleText("Y轴");
	chart->addAxis(axisY, Qt::AlignLeft);

	// x轴显示10次取随机数的结果
	QStringList x;
	for (int i = 0; i  10; ++i) {
		x  QString::number(i+1);
	}
	auto axisX = new QtCharts::QBarCategoryAxis;
	axisX->append(x);
	chart->addAxis(axisX, Qt::AlignBottom);

	auto barSeries = createSeries();
	chart->addSeries(barSeries);

	chart->setTitle("随机数分布图");
	// 显示图例以及让图例摆放在图表的底部
	chart->legend()->setVisible(true);
	chart->legend()->setAlignment(Qt::AlignBottom);
	// 显示chart的容器
	auto view = new QtCharts::QChartView(chart);
	view->setRenderHint(QPainter::Antialiasing);

	auto layout = new QVBoxLayout;
	layout->addWidget(view);
	// 点击按钮刷新显示的数据
	auto button = new QPushButton("点击刷新");
	QObject::connect(button, QPushButton::clicked, [chart]() {
		// removeAll会帮你删除原来的series，所以不必担心内存泄漏
		chart->removeAllSeries();
		auto barSeries = createSeries();
		chart->addSeries(barSeries);
	});
	layout->addWidget(button, Qt::AlignCenter);
	auto window = new QWidget;
	window->setLayout(layout);
	window->setWindowTitle("图表");
	// 图表默认会显示成最小，为了不让图表缩成一团需要给一个固定的大小
	window->resize(700, 500);
	window->show();
	app.exec();
}