qwt用法实例

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/Giser_D/article/details/86650330

#include "readsonicpoint.h"
#include "marinebase.h"
#include "QMessageBox"
#include "qfiledialog.h"
#include "qwt_legend.h"
#include "qwt_plot_picker.h"
#include "qwt_picker.h"
#include "qwt_picker_machine.h"
#include "qwt_symbol.h"

ReadSonicPoint::ReadSonicPoint(QWidget *parent, QString filepath)
	: QDialog(parent)
{
	ui.setupUi(this);
	QList<QString> csv_data_list;
	QVector<QPointF> point_list;
	QVector<QPointF> tempPoint_list;
	csv_data_list = readSonicPointFile(filepath);
	point_list = readStringListData(csv_data_list, 0);
	tempPoint_list = readStringListData(csv_data_list, 1);
	QVector<QPointF>sortPointList = sortSonicPoint(point_list);
	QVector<QPointF>sortTempPointList = sortSonicPoint(tempPoint_list);
	setEnableAllAxis(true, true, true, false);
	setQwtPlotTitle("速度(m/s)","深度(m)","温度(℃)");
	drawQwtPlotInputData(sortPointList, "声速/深度", 0);
	drawQwtPlotInputData(sortTempPointList, "温度/深度", 1);
	useQwtPlotPicker();
	ui.qwtPlot_Sonic->insertLegend(new QwtLegend(), QwtPlot::BottomLegend);  //添加图例
}

QVector<QPointF> ReadSonicPoint::sortSonicPoint(QVector<QPointF> befPointVector) //把x轴的值从小到大排序
{
	QVector<QPointF> modPointVector;
	QMap<double, double>sonicMap; //利用QMap自动排序
	for (int i = 0; i < befPointVector.size(); i++)
	{
		sonicMap.insert(befPointVector[i].x(), befPointVector[i].y());
	}
	QMap<double, double>::Iterator it = sonicMap.begin();
	while (it!=sonicMap.end())
	{
		QPointF sonicPoint;
		sonicPoint.setX(it.key());
		sonicPoint.setY(it.value());
		modPointVector.append(sonicPoint);
		it++;
	}
	return modPointVector;
}

QVector<QPointF> ReadSonicPoint::readStringListData(QList<QString> sonic_data_list, int flag)
{
	QVector<QPointF> sonic_point_list;
	QString sonic_data;
	QList<QString> sonicpointdata;
	//flag = 0:声速/深度  flag = 1:温度/深度
	for (int i = 0; i < sonic_data_list.size(); i++)
	{
		sonic_data = sonic_data_list[i];
		sonicpointdata = sonic_data.split(",");
		if (flag == 0)
		{
			QPointF point;
			point.setX(sonicpointdata[0].toDouble());
			point.setY(sonicpointdata[1].toDouble());
			sonic_point_list.append(point);
		}
		else if (flag == 1)
		{
			QPointF point;
			point.setX(sonicpointdata[0].toDouble());
			point.setY(sonicpointdata[2].toDouble());
			sonic_point_list.append(point);
		}
	}
	return sonic_point_list;
}

QList<QString> ReadSonicPoint::readSonicPointFile(QString csv_path) //读取声速文件
{
	QFile csvFile(csv_path);
	QList<QString> sonic_data_list;
	QString sonic_data;
	if (csvFile.open(QIODevice::ReadWrite))
	{
		QTextStream stream(&csvFile); 
		int i = 0;
		while (!stream.atEnd())
		{
			i = i + 1;
			sonic_data = stream.readLine();
			if (i > 2)
			{
				sonic_data_list.append(sonic_data);
			}
		}
		csvFile.close();
	}
	return sonic_data_list;
}

void ReadSonicPoint::setQwtPlotTitle(QString yLeftName, QString xBottomName, QString yRightName)
{
	ui.qwtPlot_Sonic->setAxisTitle(QwtPlot::yLeft, yLeftName);
	ui.qwtPlot_Sonic->setAxisTitle(QwtPlot::xBottom, xBottomName);
	ui.qwtPlot_Sonic->setAxisTitle(QwtPlot::yRight, yRightName);
}

//params:vector:数据  lineTitle:底下的注记 flag :y轴以哪边为准
void ReadSonicPoint::drawQwtPlotInputData(QVector<QPointF> vector, QString lineTitle, int flag)
{
	QwtPointSeriesData* series = new QwtPointSeriesData(vector);
	QwtPlotCurve* curve1 = new QwtPlotCurve(lineTitle); //设置line名称
	if (flag == 0)  //flag:0---xBottom,yLeft;
	{
		//样本点
		QwtSymbol *symbol = new QwtSymbol(QwtSymbol::Ellipse,
		QBrush(Qt::yellow), QPen(Qt::red, 2), QSize(2, 2));//设置样本点的颜色、大小
		curve1->setSymbol(symbol);//添加样本点样式
		//设置数据
		curve1->setAxes(QwtPlot::xBottom, QwtPlot::yLeft);//参照哪个坐标轴
		curve1->setData(series);
		//把曲线附加到qwtPlot上
		curve1->attach(ui.qwtPlot_Sonic);
		//curve1->setPen(QColor(255, 0, 0), 1, Qt::SolidLine);//设置画笔
		curve1->setPen(QPen(Qt::red, 1));//设置画笔
	}
	else if (flag == 1)
	{		
		//样本点
		QwtSymbol *symbol = new QwtSymbol(QwtSymbol::Ellipse,
			QBrush(Qt::yellow), QPen(Qt::blue, 2), QSize(2, 2));//设置样本点的颜色、大小
		curve1->setSymbol(symbol);//添加样本点样式
		//设置数据
		curve1->setAxes(QwtPlot::xBottom, QwtPlot::yRight);//参照哪个坐标轴
		curve1->setData(series);
		//把曲线附加到qwtPlot上
		curve1->attach(ui.qwtPlot_Sonic);
		curve1->setPen(QPen(Qt::blue, 1));//设置画笔
	}
	//添加格网
	QwtPlotGrid* grid = new QwtPlotGrid();
	grid->setPen(QColor(222, 222, 222), 1);
	grid->attach(ui.qwtPlot_Sonic);
	ui.qwtPlot_Sonic->replot();
	ui.qwtPlot_Sonic->show();
}

//用来控制是否显示坐标轴
void ReadSonicPoint::setEnableAllAxis(bool yLeftEnable, bool yRightEnable, bool xBottomEnable, bool xTopEnable)
{
	ui.qwtPlot_Sonic->enableAxis(QwtPlot::yLeft, yLeftEnable);  
	ui.qwtPlot_Sonic->enableAxis(QwtPlot::yRight, yRightEnable);  
	ui.qwtPlot_Sonic->enableAxis(QwtPlot::xBottom, xBottomEnable); 
	ui.qwtPlot_Sonic->enableAxis(QwtPlot::xTop, xTopEnable);  
}

void ReadSonicPoint::setXScale(double xMinScale,double xMaxScale,double yMinScale, double yMaxScale)
{
	ui.qwtPlot_Sonic->setAxisScale(QwtPlot::xBottom, xMinScale, xMaxScale);
	ui.qwtPlot_Sonic->setAxisScale(QwtPlot::yRight, yMinScale, yMaxScale);
}

//用于显示点的值
void ReadSonicPoint::useQwtPlotPicker()
{
	auto picker = new QwtPlotPicker(QwtPlot::xBottom,
		QwtPlot::yLeft,
		QwtPlotPicker::CrossRubberBand,
		QwtPicker::ActiveOnly,
		ui.qwtPlot_Sonic->canvas());
	picker->setStateMachine(new QwtPickerDragPointMachine());
	picker->setRubberBandPen(QColor(Qt::darkMagenta));
	picker->setTrackerPen(QColor(Qt::black));//显示实时的坐标
}

//void ReadSonicPoint::

ReadSonicPoint::~ReadSonicPoint()
{
}