以下代码什么问题,我希望Qcustomplot有第三条y轴 QCPAxis* yAxis3 = new QCPAxis(this, true); yAxis3->setVisible(true);
时间: 2024-12-17 10:43:54 浏览: 21
您的代码片段似乎是在创建一个新的QCustomPlot轴(yAxis3),但是它缺少了一些关键步骤来将这个新轴添加到QCustomPlot实例上,并将其设置为第三个y轴。以下是修复后的完整示例:
```cpp
// 首先,确保您已经包含了所需的头文件
#include <qcustomplot/qcustomplot.h>
// 然后,在QCustomPlot的构造函数之后或者适当的时候,初始化QCustomPlot
QCustomPlot *plot = new QCustomPlot(this);
// 将QCustomPlot添加到布局或其他容器中
// 创建新的y轴
QCPAxis *yAxis3 = new QCPAxis(plot, Qt::YLeft); // 添加Qt::YLeft或Qt::YRight标志来指定是左侧还是右侧轴
// 设置为第三个y轴,通常需要在plot的主轴列表里操作
plot->add Axis(yAxis3, QCPAxis::yBottom); // 这里的yBottom表示它是第二个y轴,依次类推(如yLeft、yTop)
// 显示轴
yAxis3->setVisible(true);
// 可能还需要其他设置,比如轴标签、刻度等
yAxis3->setLabel("第三条y轴");
```
相关问题
优化一下这段代码: // 取出数据 QVector<double> qVector_X, qVector_Y; for (const auto& element : inferHeatDatas) { qVector_X.append(element.distance); qVector_Y.append(element.rock_type); } QCustomPlot* TypeCustom = new QCustomPlot(); TypeCustom = ui->widget_type_curve; TypeCustom->legend->setVisible(true); TypeCustom->legend->setFont(QFont("Helvetica", 9)); QPen pen; pen.setColor(QColor(qSin(4*1+1.2)*80+80, qSin(4*0.3+0)*80+80, qSin(4*0.3+1.5)*80+80)); TypeCustom->addGraph(); TypeCustom->graph()->setPen(pen); TypeCustom->graph()->setName("123"); TypeCustom->graph()->setLineStyle(QCPGraph::lsStepCenter); TypeCustom->graph()->setScatterStyle(QCPScatterStyle(QCPScatterStyle::ssCircle, 5)); TypeCustom->graph()->setData(qVector_X, qVector_Y); TypeCustom->graph()->rescaleAxes(true); TypeCustom->yAxis->scaleRange(1.1, TypeCustom->yAxis->range().center()); TypeCustom->xAxis->scaleRange(1.1, TypeCustom->xAxis->range().center()); TypeCustom->xAxis->setTicks(false); TypeCustom->yAxis->setTicks(true); TypeCustom->xAxis->setTickLabels(false); TypeCustom->yAxis->setTickLabels(true); TypeCustom->axisRect()->setupFullAxesBox(); TypeCustom->replot();
这段代码可以进行以下优化:
1. 重复使用`ui->widget_type_curve`而不是创建新的`QCustomPlot`对象:
```cpp
QCustomPlot* TypeCustom = ui->widget_type_curve;
```
将`ui->widget_type_curve`赋值给`TypeCustom`,避免创建多余的对象。
2. 设置图例的字体和可见性:
```cpp
TypeCustom->legend->setFont(QFont("Helvetica", 9));
TypeCustom->legend->setVisible(true);
```
3. 使用链式调用来设置曲线图的属性:
```cpp
TypeCustom->addGraph()->setPen(pen)->setName("123")->setLineStyle(QCPGraph::lsStepCenter)->setScatterStyle(QCPScatterStyle(QCPScatterStyle::ssCircle, 5))->setData(qVector_X, qVector_Y)->rescaleAxes(true);
```
将多个属性设置放在一行代码中,使用链式调用来设置。
4. 使用`scaleRange`一次性调整坐标轴的范围:
```cpp
TypeCustom->yAxis->scaleRange(1.1, TypeCustom->yAxis->range().center());
TypeCustom->xAxis->scaleRange(1.1, TypeCustom->xAxis->range().center());
```
5. 使用`setTicks`和`setTickLabels`一次性设置坐标轴刻度和标签的可见性:
```cpp
TypeCustom->xAxis->setTicks(false);
TypeCustom->yAxis->setTicks(true);
TypeCustom->xAxis->setTickLabels(false);
TypeCustom->yAxis->setTickLabels(true);
```
6. 调用`setupFullAxesBox`和`replot`来完成图形的设置和重绘:
```cpp
TypeCustom->axisRect()->setupFullAxesBox();
TypeCustom->replot();
```
这些优化可以使代码更简洁、可读性更高,并减少不必要的操作。最终的优化代码如下所示:
```cpp
QVector<double> qVector_X, qVector_Y;
for (const auto& element : inferHeatDatas)
{
qVector_X.append(element.distance);
qVector_Y.append(element.rock_type);
}
QCustomPlot* TypeCustom = ui->widget_type_curve;
TypeCustom->legend->setVisible(true);
TypeCustom->legend->setFont(QFont("Helvetica", 9));
QPen pen;
pen.setColor(QColor(qSin(4*1+1.2)*80+80, qSin(4*0.3+0)*80+80, qSin(4*0.3+1.5)*80+80));
TypeCustom->addGraph()->setPen(pen)->setName("123")->setLineStyle(QCPGraph::lsStepCenter)->setScatterStyle(QCPScatterStyle(QCPScatterStyle::ssCircle, 5))->setData(qVector_X, qVector_Y)->rescaleAxes(true);
TypeCustom->yAxis->scaleRange(1.1, TypeCustom->yAxis->range().center());
TypeCustom->xAxis->scaleRange(1.1, TypeCustom->xAxis->range().center());
TypeCustom->xAxis->setTicks(false);
TypeCustom->yAxis->setTicks(true);
TypeCustom->xAxis->setTickLabels(false);
TypeCustom->yAxis->setTickLabels(true);
TypeCustom->axisRect()->setupFullAxesBox();
TypeCustom->replot();
```
QCustomPlot* TypeCustom = new QCustomPlot(); TypeCustom = ui->widget_type_curve; TypeCustom->legend->setVisible(true); TypeCustom->legend->setFont(QFont("Helvetica", 9)); QPen pen; QStringList lineNames; lineNames << "lsNone" << "lsLine" << "lsStepLeft" << "lsStepRight" << "lsStepCenter" << "lsImpulse"; TypeCustom->addGraph(); pen.setColor(QColor(qSin(4*1+1.2)*80+80, qSin(4*0.3+0)*80+80, qSin(4*0.3+1.5)*80+80)); TypeCustom->graph()->setPen(pen); TypeCustom->graph()->setName("123"); TypeCustom->graph()->setLineStyle((QCPGraph::LineStyle)4); TypeCustom->graph()->setScatterStyle(QCPScatterStyle(QCPScatterStyle::ssCircle, 5)); // generate data: QVector<double> x(15), y(15); for (int j=0; j<15; ++j) { x[j] = j/15.0 * 5*3.14 + 0.01; y[j] = 7*qSin(x[j])/x[j] - (4-QCPGraph::lsNone)*5 + (QCPGraph::lsImpulse)*5 + 2; } TypeCustom->graph()->setData(x, y); TypeCustom->graph()->rescaleAxes(true); // zoom out a bit: TypeCustom->yAxis->scaleRange(1.1, TypeCustom->yAxis->range().center()); TypeCustom->xAxis->scaleRange(1.1, TypeCustom->xAxis->range().center()); // set blank axis lines: TypeCustom->xAxis->setTicks(false); TypeCustom->yAxis->setTicks(true); TypeCustom->xAxis->setTickLabels(false); TypeCustom->yAxis->setTickLabels(true); // make top right axes clones of bottom left axes: TypeCustom->axisRect()->setupFullAxesBox(); 给我解释一下上述代码
上述代码是一个使用QCustomPlot库创建和配置一个定义曲线图的示例。下面是对代码的解释:
1. 创建一个QCustomPlot对象,并将其设置为ui中的widget_type_curve部件的指针:
```cpp
QCustomPlot* TypeCustom = new QCustomPlot();
TypeCustom = ui->widget_type_curve;
```
2. 设置图例可见,并设置其字体为Helvetica字体大小为9:
```cpp
TypeCustom->legend->setVisible(true);
TypeCustom->legend->setFont(QFont("Helvetica", 9));
```
3. 创建一个QPen对象,并设置线条名称的字符串列表:
```cpp
QPen pen;
QStringList lineNames;
lineNames << "lsNone" << "lsLine" << "lsStepLeft" << "lsStepRight" << "lsStepCenter" << "lsImpulse";
```
4. 添加一个曲线图(graph)到QCustomPlot对象中,并设置曲线的颜色、名称、线条样式和散点样式:
```cpp
TypeCustom->addGraph();
pen.setColor(QColor(qSin(4*1+1.2)*80+80, qSin(4*0.3+0)*80+80, qSin(4*0.3+1.5)*80+80));
TypeCustom->graph()->setPen(pen);
TypeCustom->graph()->setName("123");
TypeCustom->graph()->setLineStyle((QCPGraph::LineStyle)4);
TypeCustom->graph()->setScatterStyle(QCPScatterStyle(QCPScatterStyle::ssCircle, 5));
```
5. 生成数据并将其设置到曲线图中:
```cpp
QVector<double> x(15), y(15);
for (int j=0; j<15; ++j)
{
x[j] = j/15.0 * 5*3.14 + 0.01;
y[j] = 7*qSin(x[j])/x[j] - (4-QCPGraph::lsNone)*5 + (QCPGraph::lsImpulse)*5 + 2;
}
TypeCustom->graph()->setData(x, y);
```
6. 调整曲线图的坐标轴范围和刻度:
```cpp
TypeCustom->graph()->rescaleAxes(true);
TypeCustom->yAxis->scaleRange(1.1, TypeCustom->yAxis->range().center());
TypeCustom->xAxis->scaleRange(1.1, TypeCustom->xAxis->range().center());
```
7. 设置坐标轴的显示方式,其中x轴不显示刻度和标签,y轴显示刻度和标签:
```cpp
TypeCustom->xAxis->setTicks(false);
TypeCustom->yAxis->setTicks(true);
TypeCustom->xAxis->setTickLabels(false);
TypeCustom->yAxis->setTickLabels(true);
```
8. 将右上角坐标轴设置为与左下角坐标轴相同:
```cpp
TypeCustom->axisRect()->setupFullAxesBox();
```
这段代码的作用是创建一个自定义曲线图,并对其进行一系列的配置和设置,最终在ui中的widget_type_curve部件上显示出来。
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