一、简单绘图
Qt Charts基于Qt的Graphics View架构,其核心组件是QChartView 和 QChart
- QChartView是显示图标的视图,基类为QGraphicsView
- QChart的基类是QGraphicsltem
类的继承关系:
创建项目:.pro
文件中添加:QT += charts
代码如下:其他文件未修改,修改代码只在mainwindow.cpp文件中进行。
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QChartView>
#include <QLineSeries>
#include <QValueAxis>
#include <QtMath>
QT_CHARTS_USE_NAMESPACE
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
setWindowTitle("QChart简单绘图");
//创建图表框架
QChartView* cview = new QChartView(this);
QChart* chart = new QChart();
chart->setTitle("简单函数曲线");
cview->setChart(chart);
setCentralWidget(cview);
//创建折现序列
QLineSeries* seriesS = new QLineSeries;
QLineSeries* seriesC = new QLineSeries;
seriesS->setName("Sinθ");
seriesC->setName("Cosθ");
chart->addSeries(seriesS);
chart->addSeries(seriesC);
//添加数据绘制
qreal y0,y1,t=0,intv=0.1;
size_t count=100;
for (size_t i=0;i<count;i++) {
y0 = qSin(t);
y1 = qCos(t);
seriesS->append(t,y0);
seriesC->append(t,y1);
t += intv;
}
//创建坐标轴
QValueAxis* axisX = new QValueAxis;
axisX->setRange(0,10);
chart->setAxisX(axisX,seriesS);
chart->setAxisX(axisX,seriesC);
QValueAxis* axisY = new QValueAxis;
axisY->setRange(-1, 1);
chart->setAxisY(axisY,seriesS);
chart->setAxisY(axisY,seriesC);
}
MainWindow::~MainWindow()
{
delete ui;
}
二、绘制折线图
数据序列类继承关系
坐标类继承关系
实例
初步UI设计
自定义DialogPen类
新建DialogPen
类继承QDialog
:
#ifndef DIALOGPEN_H
#define DIALOGPEN_H
#include <QDialog>
#include <QColorDialog>
#include <QPen>
#include <QPalette>
namespace Ui {
class DialogPen;
}
class DialogPen : public QDialog
{
Q_OBJECT
public:
explicit DialogPen(QWidget *parent = nullptr);
~DialogPen();
QPen getpen();
static QPen getPen(QPen initPen, bool &ok);
void setPen(const QPen &pen);
private slots:
void on_pushButton_clicked();
private:
QPen m_pen;
Ui::DialogPen *ui;
};
#endif // DIALOGPEN_H
#include "dialogpen.h"
#include "ui_dialogpen.h"
#include <QString>
DialogPen::DialogPen(QWidget *parent) :
QDialog(parent),
ui(new Ui::DialogPen)
{
ui->setupUi(this);
ui->comboBox->clear();
ui->comboBox->addItem("NoPen",0);
ui->comboBox->addItem("SolidLine",1);
ui->comboBox->addItem("DashLine",2);
ui->comboBox->addItem("DotLine",3);
ui->comboBox->addItem("DashDotLine",4);
ui->comboBox->addItem("DashDotDotLine",5);
ui->comboBox->addItem("CustomDashLine",6);
ui->comboBox->setCurrentIndex(0);
}
DialogPen::~DialogPen()
{
delete ui;
}
void DialogPen::on_pushButton_clicked()
{
QColor color = m_pen.color();
QColorDialog::getColor(color);
if(color.isValid()){
QString str = QString::asprintf("background-color: rgb(%d,%d,%d)",color.red(),color.green(),color.blue());
ui->btnColor->setStyleSheet(str);
}
}
QPen DialogPen::getpen()
{
m_pen.setStyle(Qt::PenStyle(ui->comboBox->currentIndex()));
m_pen.setWidth(ui->spinBox->value());
QColor color = ui->btnColor->palette().color(QPalette::Button);
m_pen.setColor(color);
return m_pen;
}
QPen DialogPen::getPen(QPen initPen, bool &ok)
{
DialogPen* dlg = new DialogPen;
QPen pen;
dlg->setPen(initPen);
int ret = dlg->exec();
if (ret == QDialog::Accepted){
pen = dlg->getpen();
ok = true;
}else {
pen = initPen;
ok = false;
}
delete dlg;
return pen;
}
void DialogPen::setPen(const QPen &pen)
{
m_pen = pen;
ui->spinBox->setValue(pen.width());
int i = static_cast<int>(pen.style());
ui->comboBox->setCurrentIndex(i);
ui->btnColor->setAutoFillBackground(true);
QColor color = pen.color();
QString str = QString::asprintf("background-color: rgb(%d,%d,%d)",color.red(),color.green(),color.blue());
ui->btnColor->setStyleSheet(str);
}
mainwindow类
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QChartView>
#include <QtCharts>
#include <QColor>
#include <QLineSeries>
#include <QValueAxis>
#include <QtMath>
#include <QTime>
#include <QChart>
#include <QFontDialog>
#include "dialogpen.h"
QT_CHARTS_USE_NAMESPACE
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
private slots:
void on_actZoomOut_triggered();
void on_actZoomIn_triggered();
void on_actReset_triggered();
void on_actFlush_triggered();
void on_btn_set_clicked();
void on_btn_titleFont_clicked();
void on_rBtn_Up_clicked();
void on_rBtn_Down_clicked();
void on_rBtn_Left_clicked();
void on_rBtn_Right_clicked();
void on_checkBox_legend_clicked(bool checked);
void on_checkBox_legendBG_clicked(bool checked);
void on_pBtn_Font_clicked();
void on_pBtn_legendcolor_clicked();
void on_pBtn_setMargin_clicked();
void on_comboBox_motion_currentIndexChanged(int index);
void on_comboBox_theme_currentIndexChanged(int index);
void on_sin_curve_clicked();
void on_cos_curve_clicked();
void on_pBtn_name_clicked();
void on_checkBox_curve_clicked(bool checked);
void on_checkBox_data_clicked(bool checked);
void on_pBtn_color_clicked();
void on_pBtn_pen_clicked();
void on_horizontalSlider_valueChanged(int value);
void on_checkBox_pointLableVisible_clicked(bool checked);
void on_pushButton_13_clicked();
void on_pushButton_12_clicked();
void on_rBtn_Y_clicked();
void on_rBtn_XY_clicked();
void on_rBtn_XAxies_clicked();
void on_rBtn_YAxies_clicked();
void on_Axis_isVisible_clicked(bool checked);
void on_Axis_range_clicked();
void on_Axis_setTitle_clicked();
void on_Axis_titleIsVisible_clicked(bool checked);
void on_pBtn_style_clicked();
void on_pBtn_Fontcolor_clicked();
void on_pBtn_setFont_clicked();
void on_chk_scaleIsVisible_clicked(bool checked);
void on_chk_gridLineVisible_clicked(bool checked);
void on_pBtn_Fontcolor_2_clicked();
void on_pBtn_Fontcolor_3_clicked();
void on_spinBox_Tickcount_valueChanged(int arg1);
void on_spinBox_minorTickcount_valueChanged(int arg1);
void on_chk_TickLineIsVisible_clicked(bool checked);
void on_pBtn_Fontcolor_5_clicked();
void on_pBtn_Fontcolor_4_clicked();
void on_pBtn_Fontcolor_7_clicked();
void on_pBtn_Fontcolor_6_clicked();
void on_chk_MinorTickLineIsVisible_clicked(bool checked);
private:
Ui::MainWindow *ui;
void createChart();
QLineSeries* curSeries;
QValueAxis* curAxis;
void prepareData();
void updateFromChart();
};
#endif // MAINWINDOW_H
mainwindow.cpp文章来源:https://www.toymoban.com/news/detail-784418.html
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "ui_dialogPen.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
createChart();
prepareData();
updateFromChart();
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_actZoomOut_triggered()
{
ui->cView->chart()->zoom(0.8);
}
void MainWindow::on_actZoomIn_triggered()
{
ui->cView->chart()->zoom(1.2);
}
void MainWindow::on_actReset_triggered()
{
ui->cView->chart()->zoomReset();
}
void MainWindow::createChart()
{
QChart* chart = new QChart();
chart->setTitle("simple curve");
ui->cView->setChart(chart);
ui->cView->setRenderHint(QPainter::Antialiasing);
QLineSeries* series0 = new QLineSeries;
QLineSeries* series1 = new QLineSeries;
series0->setName("sin");
series1->setName("cos");
curSeries = series0;
QPen pen;
pen.setStyle(Qt::DotLine);
pen.setWidth(2);
series0->setPen(pen);
pen.setStyle(Qt::SolidLine);
pen.setColor(Qt::blue);
series1->setPen(pen);
chart->addSeries(series0);
chart->addSeries(series1);
QValueAxis* axisX = new QValueAxis;
QValueAxis* axisY = new QValueAxis;
curAxis = axisX;
axisX->setRange(0,10);
axisX->setLabelFormat("%.1f");
axisX->setTickCount(11);
axisX->setMinorTickCount(4);
axisX->setTitleText("time(secs)");
axisY->setRange(-1.5,1.5);
axisY->setTickCount(3);
axisY->setMinorTickCount(4);
axisY->setTitleText("value");
chart->setAxisX(axisX,series0);
chart->setAxisX(axisX,series1);
chart->setAxisY(axisY,series0);
chart->setAxisY(axisY,series1);
}
void MainWindow::prepareData()
{
QLineSeries* series0 = (QLineSeries*)ui->cView->chart()->series().at(0);
QLineSeries* series1 = (QLineSeries*)ui->cView->chart()->series().at(1);
int cnt = 100;
series0->clear();
series1->clear();
qsrand(QTime::currentTime().second());
qreal t=0, y1, y2, inv=0.1;
qreal rd;
for (int i=0; i<cnt; i++) {
rd = (qrand()%10)-5;
y1 = qSin(t) + rd/50;
series0->append(t,y1);
y2 = qCos(t) + rd/50;
series1->append(t,y2);
t += inv;
}
}
void MainWindow::updateFromChart()
{
QChart* chart = ui->cView->chart();
ui->lineEdit_title->setText(chart->title());
QMargins mg = chart->margins();
ui->spinBox_Down->setValue(mg.bottom());
ui->spinBox_Left->setValue(mg.left());
ui->spinBox_Right->setValue(mg.right());
ui->spinBox_Up->setValue(mg.top());
}
void MainWindow::on_actFlush_triggered()
{
prepareData();
}
void MainWindow::on_btn_set_clicked()
{
QChart *chart = ui->cView->chart();
chart->setTitle(ui->lineEdit_title->text());
}
void MainWindow::on_btn_titleFont_clicked()
{
QFont font = ui->cView->chart()->titleFont();
bool ok = false;
font = QFontDialog::getFont(&ok,font);
if(ok)
ui->cView->chart()->setTitleFont(font);
}
void MainWindow::on_rBtn_Up_clicked()
{
ui->cView->chart()->legend()->setAlignment(Qt::AlignTop);
}
void MainWindow::on_rBtn_Down_clicked()
{
ui->cView->chart()->legend()->setAlignment(Qt::AlignBottom);
}
void MainWindow::on_rBtn_Left_clicked()
{
ui->cView->chart()->legend()->setAlignment(Qt::AlignLeft);
}
void MainWindow::on_rBtn_Right_clicked()
{
ui->cView->chart()->legend()->setAlignment(Qt::AlignRight);
}
void MainWindow::on_checkBox_legend_clicked(bool checked)
{
ui->cView->chart()->legend()->setVisible(checked);
}
void MainWindow::on_checkBox_legendBG_clicked(bool checked)
{
ui->cView->chart()->legend()->setBackgroundVisible(checked);
}
void MainWindow::on_pBtn_Font_clicked()
{
QFont font = ui->cView->chart()->legend()->font();
bool ok = false;
font = QFontDialog::getFont(&ok,font);
if(ok)
ui->cView->chart()->legend()->setFont(font);
}
void MainWindow::on_pBtn_legendcolor_clicked()
{
QColor color = ui->cView->chart()->legend()->labelColor();
color = QColorDialog::getColor(color);
if(color.isValid())
ui->cView->chart()->legend()->setLabelColor(color);
}
void MainWindow::on_pBtn_setMargin_clicked()
{
QMargins mgs;
mgs.setTop(ui->spinBox_Up->value());
mgs.setLeft(ui->spinBox_Down->value());
mgs.setLeft(ui->spinBox_Left->value());
mgs.setRight(ui->spinBox_Right->value());
ui->cView->chart()->setMargins(mgs);
}
void MainWindow::on_comboBox_motion_currentIndexChanged(int index)
{
ui->cView->chart()->setAnimationOptions((QChart::AnimationOption)index);
}
void MainWindow::on_comboBox_theme_currentIndexChanged(int index)
{
ui->cView->chart()->setTheme((QChart::ChartTheme)index);
}
void MainWindow::on_sin_curve_clicked()
{
if(ui->sin_curve->isChecked())
curSeries = (QLineSeries*)ui->cView->chart()->series().at(0);
else
curSeries = (QLineSeries*)ui->cView->chart()->series().at(1);
//获取curSeries的值, 设置(标题名称,序列可见的,点数据可见,透明度滑动条)
ui->lineEdit_title->setText(curSeries->name());
ui->checkBox_curve->setChecked(curSeries->isVisible());
ui->checkBox_data->setChecked(curSeries->pointsVisible());
ui->horizontalSlider->setValue(curSeries->opacity()*10);
ui->checkBox_pointLableVisible->setChecked(curSeries->pointLabelsVisible());
}
void MainWindow::on_cos_curve_clicked()
{
on_sin_curve_clicked();
}
void MainWindow::on_pBtn_name_clicked()
{
curSeries->setName(ui->line_name->text());
}
void MainWindow::on_checkBox_curve_clicked(bool checked)
{
Q_UNUSED(checked)
curSeries->setVisible(ui->checkBox_curve->isChecked());
}
void MainWindow::on_checkBox_data_clicked(bool checked)
{
Q_UNUSED(checked)
curSeries->setPointsVisible(ui->checkBox_data->isChecked());
}
void MainWindow::on_pBtn_color_clicked()
{
QColor color = curSeries->color();
color = QColorDialog::getColor(color);
if(color.isValid())
curSeries->setColor(color);
}
void MainWindow::on_pBtn_pen_clicked()
{
bool ok = false;
QPen pen = curSeries->pen();
pen = DialogPen::getPen(pen, ok);
if(ok)
curSeries->setPen(pen);
}
void MainWindow::on_horizontalSlider_valueChanged(int value)
{
curSeries->setOpacity(value/10.0);
}
void MainWindow::on_checkBox_pointLableVisible_clicked(bool checked)
{
curSeries->setPointLabelsVisible(checked);
}
void MainWindow::on_pushButton_13_clicked()
{
QColor color = curSeries->pointLabelsColor();
color = QColorDialog::getColor(color);
if(color.isValid())
curSeries->setPointLabelsColor(color);
}
void MainWindow::on_pushButton_12_clicked()
{
QFont font = curSeries->pointLabelsFont();
bool ok = false;
font = QFontDialog::getFont(&ok, font);
if(ok)
curSeries->setPointLabelsFont(font);
}
void MainWindow::on_rBtn_Y_clicked()
{
if(ui->rBtn_Y->isChecked())
curSeries->setPointLabelsFormat("@yPoint");
else
curSeries->setPointLabelsFormat("(@xPoint,@yPoint)");
}
void MainWindow::on_rBtn_XY_clicked()
{
on_rBtn_Y_clicked();
}
void MainWindow::on_rBtn_XAxies_clicked()
{
// 设置坐标轴
QList<QAbstractAxis*> axes;
if(ui->rBtn_XAxies->isChecked())
axes = ui->cView->chart()->axes(Qt::Horizontal);
else
axes = ui->cView->chart()->axes(Qt::Vertical);
curAxis = (QValueAxis*)axes[0];
//获取坐标轴属性,显示到界面上
ui->dSBox_minV->setValue(curAxis->min());
ui->dSBox_maxV->setValue(curAxis->max());
ui->Axis_title->setText(curAxis->titleText());
ui->Axis_titleIsVisible->setChecked(curAxis->isTitleVisible());
ui->lineEdit_style->setText(curAxis->labelFormat());
ui->chk_scaleIsVisible->setChecked(curAxis->labelsVisible());
ui->chk_gridLineVisible->setChecked(curAxis->isGridLineVisible());
ui->spinBox_Tickcount->setValue(curAxis->tickCount());
ui->chk_TickLineIsVisible->setChecked(curAxis->isLineVisible());
ui->spinBox_minorTickcount->setValue(curAxis->minorTickCount());
ui->chk_MinorTickLineIsVisible->setChecked(curAxis->isMinorGridLineVisible());
}
void MainWindow::on_rBtn_YAxies_clicked()
{
on_rBtn_XAxies_clicked();
}
void MainWindow::on_Axis_isVisible_clicked(bool checked)
{
curAxis->setVisible(checked);
}
void MainWindow::on_Axis_range_clicked()
{
curAxis->setRange(ui->dSBox_minV->value(), ui->dSBox_maxV->value());
}
void MainWindow::on_Axis_setTitle_clicked()
{
curAxis->setTitleText(ui->Axis_title->text());
}
void MainWindow::on_Axis_titleIsVisible_clicked(bool checked)
{
curAxis->setTitleVisible(checked);
}
void MainWindow::on_pBtn_style_clicked()
{
curAxis->setLabelFormat(ui->lineEdit_style->text());
}
void MainWindow::on_pBtn_Fontcolor_clicked()
{
QColor color = curAxis->labelsColor();
color = QColorDialog::getColor(color);
if(color.isValid())
curAxis->setLabelsColor(color);
}
void MainWindow::on_pBtn_setFont_clicked()
{
QFont font = curAxis->labelsFont();
bool ok = false;
font = QFontDialog::getFont(&ok, font);
if(ok)
curAxis->setLabelsFont(font);
}
void MainWindow::on_chk_scaleIsVisible_clicked(bool checked)
{
curAxis->setLineVisible(checked);
}
void MainWindow::on_chk_gridLineVisible_clicked(bool checked)
{
curAxis->setGridLineVisible(checked);
}
void MainWindow::on_pBtn_Fontcolor_2_clicked()
{
QColor color = curAxis->gridLineColor();
color = QColorDialog::getColor(color);
if(color.isValid())
curAxis->setGridLineColor(color);
}
void MainWindow::on_pBtn_Fontcolor_3_clicked()
{
bool ok = false;
QPen pen = curAxis->gridLinePen();
pen = DialogPen::getPen(pen, ok);
if(ok)
curAxis->setGridLinePen(pen);
}
void MainWindow::on_spinBox_Tickcount_valueChanged(int arg1)
{
curAxis->setTickCount(arg1);
}
void MainWindow::on_spinBox_minorTickcount_valueChanged(int arg1)
{
curAxis->setMinorTickCount(arg1);
}
void MainWindow::on_chk_TickLineIsVisible_clicked(bool checked)
{
curAxis->setLineVisible(checked);
}
void MainWindow::on_pBtn_Fontcolor_5_clicked()
{
bool ok = false;
QPen pen = curAxis->linePen();
pen = DialogPen::getPen(pen, ok);
if(ok)
curAxis->setLinePen(pen);
}
void MainWindow::on_pBtn_Fontcolor_4_clicked()
{
QColor color = curAxis->linePenColor();
color = QColorDialog::getColor(color);
if(color.isValid())
curAxis->setLinePenColor(color);
}
void MainWindow::on_pBtn_Fontcolor_7_clicked()
{
QColor color = curAxis->minorGridLineColor();
color = QColorDialog::getColor(color);
if(color.isValid())
curAxis->setMinorGridLineColor(color);
}
void MainWindow::on_pBtn_Fontcolor_6_clicked()
{
bool ok = false;
QPen pen = curAxis->gridLinePen();
pen = DialogPen::getPen(pen, ok);
if(ok)
curAxis->setGridLinePen(pen);
}
void MainWindow::on_chk_MinorTickLineIsVisible_clicked(bool checked)
{
curAxis->setMinorGridLineVisible(checked);
}
效果演示
文章来源地址https://www.toymoban.com/news/detail-784418.html
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