信号与槽的连接
for(int i = 0; i < charts_list_->count(); i++){
connect(charts_list_->at(i)->series2_,SIGNAL(clicked(QPointF)),this,SLOT(series2HandleClickedPoint(QPointF)));
}
槽函数
void View::series2HandleClickedPoint(const QPointF &point){
PulseGraphOperator::UnSelectPointInAllCharts(charts_list_, point.x());
}
UnSelectPointInAllCharts()方法是为了多个图同步进行反选
void PulseGraphOperator::UnSelectPointInAllCharts(QList<Chart *> *list, qreal xpos){
for(int i = 0; i < list->count(); i++){
PulseGraphOperator::UnSelectPoint(list->at(i), xpos);
}
}
UnSelectPoint()方法实现反选，将反选的点从已选中序列series2中移除，添加到原序列series1
void PulseGraphOperator::UnSelectPoint(Chart* chart, qreal xpos){
QPointF clicked_point;
if(chart->series2_->points().size() > 1){
foreach(QPointF series2_point, chart->series2_->points()){
if(series2_point.x() == xpos){
clicked_point = series2_point;
break;
}
}
chart->series1_->append(clicked_point);
chart->series2_->remove(clicked_point);
qDebug()<<"series2.point > 1";
}else{
chart->series1_->append(chart->series2_->points());
chart->series2_->clear();
qDebug()<<"series2.point = 1";
}
qDebug()<<"UnSelect point";
}
无奈出现空指针异常，读取或者访问冲突，不知道问题出在哪里？
