Qt编写数据可视化大屏界面电子看板10-改造QCustomPlot

void CustomPlot::mouseMove(QMouseEvent *event)
{
    if (tracer == 0 || textTip == 0) {
        return;
    }

    //跟踪鼠标点击事件点击位置
    QCPGraph *graph = (QCPGraph *)customPlot->plottableAt(event->pos(), true);
    QRect rect(0, 0, 1, 1);

    QString labx, laby;
    int offset = 10;
    bool toolTip = false;

    if(graph != 0) {
        double posKey;
        double key = 0, value = 0;
        QPoint p;
        p.setX(event->pos().x());
        p.setY(event->pos().y());

#ifdef old
        foreach(QCPData data, graph->data()->values()) {
            key = data.key;
            value = data.value;
#else
        for (int i = 0; i < graph->dataCount(); i++) {
            key = graph->dataMainKey(i);
            value = graph->dataMainValue(i);
#endif
            //取出对应key处的label标签,如果标签为空则取key的字符串
            labx = customPlot->xAxis->tickVectorLabels().at(key);
            labx = labx.isEmpty() ? QString::number(key) : labx;

            //如果启用了百分比则需要后面显示百分比
            if (this->getPercentY()) {
                laby = QString("%1%").arg(value);
            } else {
                laby = QString("%1").arg(value);
            }

            posKey = customPlot->xAxis->coordToPixel(key);
            if(qAbs(posKey - event->pos().x()) <= offset) {
                double posx = graph->keyAxis()->coordToPixel(key);
                double posy = graph->valueAxis()->coordToPixel(value);
                rect.setRect(posx - offset, posy - offset, offset * 2, offset * 2);
                if(!rect.contains(event->pos())) {
                    continue;
                } else {
                    break;
                }
            }

            if(posKey - event->pos().x() > offset) {
                break;
            }
        }

        if(!graph->realVisibility()) {
            toolTip = false;
            tracer->setVisible(false);
            customPlot->replot();
        } else if(rect.contains(event->pos())) {
            toolTip = true;
            tracer->setVisible(true);
            tracer->setGraph(graph);
            tracer->setGraphKey(key);
            customPlot->replot();
        } else if(tracer->visible()) {
            toolTip = false;
            tracer->setVisible(false);
            customPlot->replot();
        }
    }
    else if(tracer->visible()) {
        toolTip = false;
        tracer->setVisible(false);
        customPlot->replot();
    }

    //处理提示信息
    if(toolTip) {
        //根据设定的提示信息位置调整
        double x = event->pos().x();
        double y = event->pos().y();
        if (toolTipPosition == 0) {
            //判断曲线控件的位置已经当前鼠标位置做出调整
            bool right = (customPlot->width() - x < 90);
            bool bottom = (customPlot->height() - y < 50);
            if (right) {
                if (bottom) {
                    x = x - 80;
                    y = y - 50;
                } else {
                    x = x - 80;
                    y = y - 20;
                }
            } else {
                if (bottom) {
                    x = x + 10;
                    y = y - 50;
                } else {
                    x = x + 10;
                    y = y - 20;
                }
            }
        } else if (toolTipPosition == 1) {
            x = x - 30;
            y = y - 50;
        } else if (toolTipPosition == 2) {
            x = x + 10;
            y = y - 50;
        } else if (toolTipPosition == 3) {
            x = x + 10;
            y = y - 20;
        } else if (toolTipPosition == 4) {
            x = x + 10;
            y = y + 10;
        } else if (toolTipPosition == 5) {
            x = x - 30;
            y = y + 10;
        } else if (toolTipPosition == 6) {
            x = x - 75;
            y = y + 10;
        } else if (toolTipPosition == 7) {
            x = x - 80;
            y = y - 20;
        } else if (toolTipPosition == 8) {
            x = x - 80;
            y = y - 50;
        }

        QString text = "横坐标: " + labx + "\n当前值: " + laby;
        textTip->position->setCoords(x, y);
        textTip->setText(text);
        textTip->setVisible(true);
        customPlot->replot();
    } else {
        if (textTip->visible()) {
            textTip->setVisible(false);
            customPlot->replot();
        }
    }
}