electrocardiograph_upper/libzqt/widgetplot2d.cpp

#include "widgetplot2d.h"

#include <QDebug>

#include "ui_widgetplot2d.h"

WidgetPlot2D::WidgetPlot2D(QWidget* parent) : QWidget(parent), ui(new Ui::WidgetPlot2D), time(QTime::currentTime()) {
  ui->setupUi(this);
  // QCP绘图初始化
  initQCP();
  // 初始化控件
  initWidget();
  // 上下分裂器
  ui->splitter->setStretchFactor(0, 20);
  ui->splitter->setStretchFactor(1, 1);
  // 左右分裂器
  ui->splitter1->setStretchFactor(0, 10);
  ui->splitter1->setStretchFactor(1, 3);
  // 滚动条设置
  ui->horizontalScrollBar->setRange(0, 0);
  // 拖动水平滚动条，图幅跟随变化
  connect(ui->horizontalScrollBar, SIGNAL(valueChanged(int)), this, SLOT(horzScrollBarChanged(int)));
  // 默认坐标范围
  ui->customPlot->yAxis->setRange(-20, 20);
  ui->customPlot->replot();
}

WidgetPlot2D::~WidgetPlot2D() { delete ui; }
/* 初始化曲线名称 */
void WidgetPlot2D::initGraphName(QStringList name) {
  //----------------------------------------------------------------------------------------//
  // 设置表头
  ui->treeWidget->setHeaderLabels(QStringList() << "名称"
                                                << "值"
                                                << "颜色");
  ui->treeWidget->header()->setVisible(true);
  // 表头文字中间对齐
  QTreeWidgetItem* header = ui->treeWidget->headerItem();
  header->setTextAlignment(0, Qt::AlignLeft);
  header->setTextAlignment(1, Qt::AlignLeft);
  header->setTextAlignment(2, Qt::AlignLeft);
  // 设置列宽
  ui->treeWidget->setColumnWidth(0, 100);
  ui->treeWidget->setColumnWidth(1, 90);
  ui->treeWidget->setColumnWidth(2, 30);
  // 表头顺序是否可以拖动改变
  ui->treeWidget->header()->setCascadingSectionResizes(true);
  // 被选部分是否高亮显示
  ui->treeWidget->header()->setHighlightSections(false);
  // 最后一个区域是否占满表格余下的所有部分
  ui->treeWidget->header()->setStretchLastSection(true);
  // 列表的列数
  ui->treeWidget->setColumnCount(3);
  //----------------------------------------------------------------------------------------//
  for (int i = 0; i < name.length(); i++) {
    // 添加曲线列表项
    QTreeWidgetItem* item = new QTreeWidgetItem;
    ui->treeWidget->addTopLevelItem(item);
    //----------------------------------------------------------------------------------------//
    // 向曲线列表项第一列添加曲线是否可见复选框
    QCheckBox* isShowCheckBox = new QCheckBox(name.at(i));
    isShowCheckBox->setChecked(true);
    connect(isShowCheckBox, SIGNAL(stateChanged(int)), this, SLOT(changeGraphVisible()));
    ui->treeWidget->setItemWidget(item, 0, isShowCheckBox);
    isShowCheckBoxVector.append(isShowCheckBox);
    //----------------------------------------------------------------------------------------//
    // 向曲线列表项第二列添加曲线数值标签
    QLabel* valueLabel = new QLabel("0");
    QFont   font("Courier");
    valueLabel->setFont(font);
    // valueLabel->setAlignment(Qt::AlignHCenter);
    ui->treeWidget->setItemWidget(item, 1, valueLabel);
    valueLabelVector.append(valueLabel);
    //----------------------------------------------------------------------------------------//
    // 向曲线列表项第三列添加曲线颜色按钮，点击该按钮弹出颜色选择框，选择曲线颜色
    QPushButton* GraphColorPushButton = new QPushButton("");
    // 随机分配初始按钮背景色
    static int r = 0, g = 0, b = 0;
    r += 150;
    g += 50;
    b += 100;
    if (r > 255) r -= 255;
    if (g > 255) g -= 255;
    if (b > 255) b -= 255;
    QPalette pal;
    pal.setColor(QPalette::Button, QColor(r, g, b));
    GraphColorPushButton->setPalette(pal);
    GraphColorPushButton->setAutoFillBackground(true);  // 该句不能缺少，否则背景颜色无法改变
    GraphColorPushButton->setFlat(true);
    // 固定颜色按钮大小
    GraphColorPushButton->setMinimumHeight(18);  // 固定高度
    GraphColorPushButton->setMaximumHeight(18);
    GraphColorPushButton->setMinimumWidth(30);  // 固定宽度
    GraphColorPushButton->setMaximumWidth(30);
    connect(GraphColorPushButton, SIGNAL(clicked()), this, SLOT(changeGraphColor()));
    ui->treeWidget->setItemWidget(item, 2, GraphColorPushButton);
    GraphColorPushButtonVector.append(GraphColorPushButton);
    //----------------------------------------------------------------------------------------//
    // 添加曲线
    ui->customPlot->addGraph();
    ui->customPlot->graph(ui->customPlot->graphCount() - 1)->setPen(QPen(QColor(r, g, b)));
    ui->customPlot->graph(ui->customPlot->graphCount() - 1)->setVisible(true);
    // 将曲线名称与曲线序号一一对应，之后添加数据就可以一一对应
    nameToGraphMap[name.at(i)] = i;
    // 初始化数据容器的值
    for (int t = 0; t < name.length(); t++) {
      valueVector.append(0);
    }
  }
}

/* 添加数据 */
void WidgetPlot2D::addData(QString name, double value, int offms) {
  // 如果点击了“暂停”按钮，则不绘制图形
  if (ui->pausePBtn->text() == "开始") return;
  // 系统当前时间 = 系统运行初始时间 + 系统运行时间
  static double start = time.hour() * 60 * 60 + time.minute() * 60 + time.second() + time.msec() / 1000.0;
  double        key   = start + time.elapsed() / 1000.0 + offms / 1000;
  //    double start = 0;
  //    static int key = 0;
  //    key++;
  //    qDebug() << "start" << start;
  //    qDebug() << "key" << key;
  // 子网格显示
  ui->customPlot->xAxis->grid()->setSubGridVisible(ui->subGridCheck->isChecked());
  ui->customPlot->yAxis->grid()->setSubGridVisible(ui->subGridCheck->isChecked());
  // 自适应量程
  if (ui->autoRangeCheck->isChecked()) {
    ui->customPlot->rescaleAxes();
  }
  // 设置时间轴
  int timeAxis = ui->timeAxisSpin->value();
  ui->customPlot->xAxis->setRange(key, timeAxis, Qt::AlignRight);
  // x轴和y轴全程显示
  if (ui->fullShowCheck->isChecked()) {
    ui->customPlot->rescaleAxes();
  }
  // 刷新绘图水平滚动条
  ui->horizontalScrollBar->setRange(int(start), int(key));  // 刷新滚动条的范围
  ui->horizontalScrollBar->setPageStep(1);                  // 设置翻页步长为 1s 的宽度
  ui->horizontalScrollBar->setValue(int(key));              // 调整滑块位置到最右边
  // 更新曲线绘图
  ui->customPlot->graph(nameToGraphMap[name])->addData(key, value);
  // ui->customPlot->replot();
  //  使用rpQueuedReplot参数可以加快绘图速度，避免不必要的重复绘制
  ui->customPlot->replot(QCustomPlot::rpQueuedReplot);
  // 存储曲线的当前值
  valueVector[nameToGraphMap[name]] = value;
  //----------------------------------------------------------------------------------------//
  // 计算每秒的帧率
  static double lastFpsKey = key;
  static int    frameCount = 0;
  frameCount++;
  // 每2秒显示一次帧率
  if (key - lastFpsKey > 0.5) {
    uint64_t sum = 0;
    for (int i = 0; i < ui->customPlot->plottableCount(); i++) {
      sum += uint64_t(ui->customPlot->graph(i)->data()->size());
    }
    ui->statusLabel->setText(QString("%1 FPS, Total Data points: %2").arg(frameCount / (key - lastFpsKey), 0, 'f', 0).arg(sum));
    lastFpsKey = key;
    frameCount = 0;
    // 更新数据标签
    for (int t = 0; t < ui->customPlot->plottableCount(); t++) {
      valueLabelVector[t]->setText(QString::number(valueVector[t]));
    }
  }
  //----------------------------------------------------------------------------------------//
}

/* 曲线是否显示 */
void WidgetPlot2D::changeGraphVisible() {
  for (int i = 0; i < isShowCheckBoxVector.length(); i++) {
    ui->customPlot->graph(i)->setVisible(isShowCheckBoxVector[i]->isChecked());
  }
}

/* 改变曲线颜色 */
void WidgetPlot2D::changeGraphColor() {
  /* 在槽（SLOT)中sender()函数会返回一个指向 QObject 的指针来指向信号的发送者。
   * 然后通过 C++ RTTI(Run-Time Type Identification)机制提供的dynamic_cast运算符，
   * 在执行的时候检查sender()返回的对象是否是QPushButton类，如果是则将sender()返回的QObject指针转换为QPushButton指针，
   * 然后if中的语句就会执行。如果sender()返回的对象不是QPushButton类型的指针，则dynamic_cast就会返回0，if中的语句就不会执行了。
   * */
  if (QPushButton* btn = dynamic_cast<QPushButton*>(sender())) {
    QColor color = QColorDialog::getColor(Qt::white, this);
    // 用户取消颜色对话框
    if (color.isValid() == false) return;
    // 设置按钮背景色
    QPalette pal;  // = btn->palette();
    pal.setColor(QPalette::Button, color);
    btn->setPalette(pal);
    btn->setAutoFillBackground(true);  // 该句不能缺少，否则背景颜色无法改变
    btn->setFlat(true);                // 该句不能缺少，否则背景颜色无法改变
  }
  // 改变对应的曲线颜色
  for (int i = 0; i < GraphColorPushButtonVector.length(); i++) {
    // 获取按钮的颜色
    QPalette pal   = GraphColorPushButtonVector[i]->palette();
    QColor   color = pal.color(QPalette::Button);
    // 曲线颜色对应按钮颜色
    ui->customPlot->graph(i)->setPen(QPen(color));
  }
  ui->customPlot->replot();
}

/* QCP绘图初始化 */
void WidgetPlot2D::initQCP() {
  // 刻度显示
  ui->customPlot->xAxis->setTicks(true);
  ui->customPlot->yAxis->setTicks(true);
  // 刻度值显示
  ui->customPlot->xAxis->setTickLabels(true);
  ui->customPlot->yAxis->setTickLabels(true);
  // 网格显示
  ui->customPlot->xAxis->grid()->setVisible(true);
  ui->customPlot->yAxis->grid()->setVisible(true);
  // 子网格显示
  ui->customPlot->xAxis->grid()->setSubGridVisible(false);
  ui->customPlot->yAxis->grid()->setSubGridVisible(false);
  // 右和上坐标轴、刻度值显示
  ui->customPlot->xAxis2->setVisible(true);
  ui->customPlot->yAxis2->setVisible(true);
  ui->customPlot->yAxis2->setTicks(true);
  ui->customPlot->yAxis2->setTickLabels(true);
  // make top right axes clones of bottom left axes. Looks prettier:
  //    ui->customPlot->axisRect()->setupFullAxesBox();
  // make left and bottom axes always transfer their ranges to right and top axes:
  connect(ui->customPlot->xAxis, SIGNAL(rangeChanged(QCPRange)), ui->customPlot->xAxis2, SLOT(setRange(QCPRange)));
  connect(ui->customPlot->yAxis, SIGNAL(rangeChanged(QCPRange)), ui->customPlot->yAxis2, SLOT(setRange(QCPRange)));
  // 暗色主题
  // setPlotTheme(Qt::white, Qt::black);
  // 亮色主题
  setTheme(Qt::black, Qt::white);
  // 可放大缩小和移动
  ui->customPlot->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom);
  // x轴以时间形式显示
  QSharedPointer<QCPAxisTickerTime> timeTicker(new QCPAxisTickerTime);
  timeTicker->setTimeFormat("%h:%m:%s");
  ui->customPlot->xAxis->setTicker(timeTicker);
  ui->customPlot->axisRect()->setupFullAxesBox();
  ui->customPlot->replot();
}

/* 设置绘图主题 */
void WidgetPlot2D::setTheme(QColor axis, QColor background) {
  // 坐标颜色按钮
  QPalette pal = ui->axisColorPBtn->palette();
  pal.setColor(QPalette::Button, axis);
  ui->axisColorPBtn->setPalette(pal);
  ui->axisColorPBtn->setAutoFillBackground(true);  // 该句不能缺少，否则背景颜色无法改变
  ui->axisColorPBtn->setFlat(true);                // 该句不能缺少，否则背景颜色无法改变
  // 背景颜色按钮
  pal = ui->backgroundColorPBtn->palette();
  pal.setColor(QPalette::Button, background);
  ui->backgroundColorPBtn->setPalette(pal);
  ui->backgroundColorPBtn->setAutoFillBackground(true);  // 该句不能缺少，否则背景颜色无法改变
  ui->backgroundColorPBtn->setFlat(true);                // 该句不能缺少，否则背景颜色无法改变
                                                         //----------------------------------------------------------------------------------------//
  // 坐标标注颜色
  ui->customPlot->xAxis->setLabelColor(axis);
  ui->customPlot->yAxis->setLabelColor(axis);
  // 坐标刻度值颜色
  ui->customPlot->xAxis->setTickLabelColor(axis);
  ui->customPlot->yAxis->setTickLabelColor(axis);
  // 坐标基线颜色和宽度
  ui->customPlot->xAxis->setBasePen(QPen(axis, 1));
  ui->customPlot->yAxis->setBasePen(QPen(axis, 1));
  // 坐标主刻度颜色和宽度
  ui->customPlot->xAxis->setTickPen(QPen(axis, 1));
  ui->customPlot->yAxis->setTickPen(QPen(axis, 1));
  // 坐标子刻度颜色和宽度
  ui->customPlot->xAxis->setSubTickPen(QPen(axis, 1));
  ui->customPlot->yAxis->setSubTickPen(QPen(axis, 1));
  // 坐标标注颜色
  ui->customPlot->xAxis2->setLabelColor(axis);
  ui->customPlot->yAxis2->setLabelColor(axis);
  // 坐标刻度值颜色
  ui->customPlot->xAxis2->setTickLabelColor(axis);
  ui->customPlot->yAxis2->setTickLabelColor(axis);
  // 坐标基线颜色和宽度
  ui->customPlot->xAxis2->setBasePen(QPen(axis, 1));
  ui->customPlot->yAxis2->setBasePen(QPen(axis, 1));
  // 坐标主刻度颜色和宽度
  ui->customPlot->xAxis2->setTickPen(QPen(axis, 1));
  ui->customPlot->yAxis2->setTickPen(QPen(axis, 1));
  // 坐标子刻度颜色和宽度
  ui->customPlot->xAxis2->setSubTickPen(QPen(axis, 1));
  ui->customPlot->yAxis2->setSubTickPen(QPen(axis, 1));
  // 整个画布背景色
  ui->customPlot->setBackground(background);
  // 绘图区域背景色
  ui->customPlot->axisRect()->setBackground(background);
  // 刷新绘图
  ui->customPlot->replot();
}

/* 初始化控件 */
void WidgetPlot2D::initWidget() {
  // 时间轴默认时间宽度
  ui->timeAxisSpin->setValue(20);
  // 主题
  QStringList theme;
  theme << "亮色"
        << "暗色"
        << "自定义";
  ui->themeCombo->addItems(theme);
  connect(ui->themeCombo, SIGNAL(currentIndexChanged(int)), this, SLOT(changePlotTheme()));
  //----------------------------------------------------------------------------------------//
  // 坐标颜色按钮
  QPalette pal = ui->axisColorPBtn->palette();
  pal.setColor(QPalette::Button, Qt::black);
  ui->axisColorPBtn->setPalette(pal);
  ui->axisColorPBtn->setAutoFillBackground(true);  // 该句不能缺少，否则背景颜色无法改变
  ui->axisColorPBtn->setFlat(true);                // 该句不能缺少，否则背景颜色无法改变
  connect(ui->axisColorPBtn, SIGNAL(clicked()), this, SLOT(changePlotTheme()));
  // 背景颜色按钮
  pal = ui->backgroundColorPBtn->palette();
  pal.setColor(QPalette::Button, Qt::white);
  ui->backgroundColorPBtn->setPalette(pal);
  ui->backgroundColorPBtn->setAutoFillBackground(true);  // 该句不能缺少，否则背景颜色无法改变
  ui->backgroundColorPBtn->setFlat(true);                // 该句不能缺少，否则背景颜色无法改变
  connect(ui->backgroundColorPBtn, SIGNAL(clicked()), this, SLOT(changePlotTheme()));
  // 操作按钮
  connect(ui->clearPBtn, SIGNAL(clicked()), this, SLOT(plotOperation()));
  connect(ui->fullShowPBtn, SIGNAL(clicked()), this, SLOT(plotOperation()));
  connect(ui->savePBtn, SIGNAL(clicked()), this, SLOT(plotOperation()));
  connect(ui->pausePBtn, SIGNAL(clicked()), this, SLOT(plotOperation()));
  //----------------------------------------------------------------------------------------//
}

/* 改变画图主题 */
void WidgetPlot2D::changePlotTheme() {
  // 主题选择
  if (QComboBox* combo = dynamic_cast<QComboBox*>(sender())) {
    if (combo->currentText() == "亮色") {
      setTheme(Qt::black, Qt::white);  // 亮色主题

    } else if (combo->currentText() == "暗色") {
      setTheme(Qt::white, Qt::black);  // 暗色主题

    } else if (combo->currentText() == "自定义") {
      // 绘图坐标颜色
      QPalette axisPal   = ui->axisColorPBtn->palette();
      QColor   axisColor = axisPal.color(QPalette::Button);
      // 绘图背景颜色
      QPalette backgroundPal   = ui->backgroundColorPBtn->palette();
      QColor   backgroundColor = backgroundPal.color(QPalette::Button);

      setTheme(axisColor, backgroundColor);
    }
  }

  // 用户自定义主题
  if (QPushButton* btn = dynamic_cast<QPushButton*>(sender())) {
    QColor color = QColorDialog::getColor(Qt::white, this);
    // 用户取消颜色对话框
    if (color.isValid() == false) return;
    // 设置按钮背景色
    QPalette pal = btn->palette();
    pal.setColor(QPalette::Button, color);
    btn->setPalette(pal);
    btn->setAutoFillBackground(true);  // 该句不能缺少，否则背景颜色无法改变
    btn->setFlat(true);                // 该句不能缺少，否则背景颜色无法改变
    // 绘图坐标颜色
    QPalette axisPal   = ui->axisColorPBtn->palette();
    QColor   axisColor = axisPal.color(QPalette::Button);
    // 绘图背景颜色
    QPalette backgroundPal   = ui->backgroundColorPBtn->palette();
    QColor   backgroundColor = backgroundPal.color(QPalette::Button);
    // 改变主题颜色
    setTheme(axisColor, backgroundColor);
    ui->themeCombo->setCurrentText("自定义");
  }
}

/* 绘图操作 */
void WidgetPlot2D::plotOperation() {
  if (QPushButton* btn = dynamic_cast<QPushButton*>(sender())) {
    if (btn->text() == "清除") {
      for (int i = 0; i < ui->customPlot->graphCount(); i++) {
        // 先获得每条曲线的数据指针，然后删除数据
        ui->customPlot->graph(i)->data()->clear();
        ui->customPlot->replot();
        time = QTime::currentTime();
      }
    }
    if (btn->text() == "整图") {
      ui->customPlot->rescaleAxes();
      ui->customPlot->replot();
    }
    if (btn->text() == "保存") {
      savePlotPng();
    }
    if (btn->text() == "暂停") {
      btn->setText("开始");
      QIcon icon(":/image/player.png");
      btn->setIcon(icon);
    } else if (btn->text() == "开始") {
      btn->setText("暂停");
      QIcon icon(":/image/pause.png");
      btn->setIcon(icon);
    }
  }
}

/* 判断路径是否存在，不存在则新建，只能创建一级子目录，必须保证上级目录存在 */
bool WidgetPlot2D::isDirExist(QString fullPath) {
  QDir dir(fullPath);
  if (dir.exists()) {
    return true;
  } else {
    // 创建一级子目录，必须保证上级目录存在
    bool ok = dir.mkdir(fullPath);
    return ok;
  }
}

/* 保存绘图成图片 */
void WidgetPlot2D::savePlotPng() {
  // 获取程序运行路径
  QString savePath = QCoreApplication::applicationDirPath() + "/output";
  // 判断文件路径
  if (isDirExist(savePath)) {
  } else {
    qDebug() << "保存文件目录未找到!";
    QMessageBox::warning(this, "warning", "保存文件目录未找到!", QMessageBox::Yes, QMessageBox::Yes);
  }
  QString fileName = QFileDialog::getSaveFileName(this,
                                                  "保存波形数据",                // 对话框的标题
                                                  savePath,                      // 保存的默认路径为程序运行路径
                                                  "Save Picture (*.png *jpg)");  // 打开文件的类型，;隔开
  // 如果用户点击了“取消”按钮
  if (fileName.isNull()) return;
  // 保存图片
  ui->customPlot->savePng(fileName, 1280, 800, 1.0, -1, 255);
}

/* 水平滚动条移动 */
void WidgetPlot2D::horzScrollBarChanged(int value) {
  // 若全程显示，则不移动绘图坐标
  if (ui->fullShowCheck->isChecked()) return;
  int timeAxis = ui->timeAxisSpin->value();
  ui->customPlot->xAxis->setRange(value, timeAxis, Qt::AlignRight);
  ui->customPlot->replot();
}