#include "TransparentDraggableCrackObject.h"
#include <QMouseEvent>
#include <QWheelEvent>
#include <QDebug>
#include <cmath>

QPointer<TransparentDraggableCrackObject> TransparentDraggableCrackObject::s_activeObject = nullptr;

TransparentDraggableCrackObject::TransparentDraggableCrackObject(QCustomPlot *parentPlot,
                                                                 const QString &strUuid, double depth, QString type, QString showNames)
    : QObject(parentPlot)
    , mPlot(parentPlot)
    , m_uuid(strUuid)
    , m_depth(depth)
    , m_endX(mPlot->xAxis->range().upper)
    , mCurve(nullptr)
    , m_tracer1(nullptr)
    , m_tracer2(nullptr)
    , m_dragStateA(IdleA)
    , m_isAddingLine(false)
    , m_offsetXB(0.0), m_offsetYB(0.0)
    , m_dragStateB(IdleB)
    , m_draggedLineIndex(-1)
    , m_curveC(nullptr)
    , m_offsetXC(0.0), m_offsetYC(0.0)
    , m_cFinished(false)
    , m_cDragging(false)
    , m_draggingPoint(false)
    , m_draggedPointIndex(-1)
{
    if("高导缝" == type)
    {
        m_type = TYPE_A;
        m_lineColor.setNamedColor("#FF0000");
        m_typeName = "高导缝";
    }
    else if("高阻缝" == type)
    {
        m_type = TYPE_A;
        m_lineColor.setNamedColor("#400040");
        m_typeName = "高阻缝";
    }
    else if("诱导缝" == type)
    {
        m_type = TYPE_A;
        m_lineColor.setNamedColor("#00FFFF");
        m_typeName = "诱导缝";
    }
    else if("层理" == type)
    {
        m_type = TYPE_A;
        m_lineColor.setNamedColor("#00FF00");
        m_typeName = "层理";
    }
    else if("侵蚀面" == type)
    {
        m_type = TYPE_A;
        m_lineColor.setNamedColor("#409600");
        m_typeName = "侵蚀面";
    }
    else if("断层" == type)
    {
        m_type = TYPE_A;
        m_lineColor.setNamedColor("#A65300");
        m_typeName = "断层";
    }
    else if("自定义1" == type)
    {
        m_type = TYPE_A;
        m_lineColor.setNamedColor("#000000");
        m_typeName = "自定义1";
    }
    else if("自定义2" == type)
    {
        m_type = TYPE_A;
        m_lineColor.setNamedColor("#000000");
        m_typeName = "自定义2";
    }
    else if("网状缝" == type)
    {
        m_type = TYPE_B;
        m_lineColor.setNamedColor("#808000");
        m_typeName = "网状缝";
    }
    else if("垂直缝" == type)
    {
        m_type = TYPE_B;
        m_lineColor.setNamedColor("#FF0000");
        m_typeName = "垂直缝";
    }
    else if("孔洞" == type)
    {
        m_type = TYPE_C;
        m_lineColor.setNamedColor("#FF8064");
        m_typeName = "孔洞";
    }
    else if("气孔" == type)
    {
        m_type = TYPE_C;
        m_lineColor.setNamedColor("#FFFF00");
        m_typeName = "气孔";
    }
    else if("砾石" == type)
    {
        m_type = TYPE_C;
        m_lineColor.setNamedColor("#000096");
        m_typeName = "砾石";
    }
    else if("结核" == type)
    {
        m_type = TYPE_C;
        m_lineColor.setNamedColor("#A65300");
        m_typeName = "结核";
    }
    else if("团块" == type)
    {
        m_type = TYPE_C;
        m_lineColor.setNamedColor("#000000");
        m_typeName = "团块";
    }

    // 创建的时候判断是否显示
//    if(showNames.contains("高导缝"))
//    {
//        m_isShow = true;
//    }
//    else if(showNames.contains("高阻缝"))
//    {
//        m_isShow = true;
//    }
//    else if(showNames.contains("诱导缝"))
//    {
//        m_isShow = true;
//    }
//    else if(showNames.contains("层理"))
//    {
//        m_isShow = true;
//    }
//    else if(showNames.contains("侵蚀面"))
//    {
//        m_isShow = true;
//    }
//    else if("断层" == type)
//    {
//        m_type = TYPE_A;
//        m_lineColor.setNamedColor("#A65300");
//    }
//    else if("自定义1" == type)
//    {
//        m_type = TYPE_A;
//        m_lineColor.setNamedColor("#000000");
//    }
//    else if("自定义2" == type)
//    {
//        m_type = TYPE_A;
//        m_lineColor.setNamedColor("#000000");
//    }
//    else if("网状缝" == type)
//    {
//        m_type = TYPE_B;
//        m_lineColor.setNamedColor("#808000");
//    }
//    else if("垂直缝" == type)
//    {
//        m_type = TYPE_B;
//        m_lineColor.setNamedColor("#FF0000");
//    }
//    else if("孔洞" == type)
//    {
//        m_type = TYPE_C;
//        m_lineColor.setNamedColor("#FF8064");
//    }
//    else if("气孔" == type)
//    {
//        m_type = TYPE_C;
//        m_lineColor.setNamedColor("#FFFF00");
//    }
//    else if("砾石" == type)
//    {
//        m_type = TYPE_C;
//        m_lineColor.setNamedColor("#000096");
//    }
//    else if("结核" == type)
//    {
//        m_type = TYPE_C;
//        m_lineColor.setNamedColor("#A65300");
//    }
//    else if("团块" == type)
//    {
//        m_type = TYPE_C;
//        m_lineColor.setNamedColor("#000000");
//    }


    if (m_type == TYPE_A) {
        m_orig_x1 = m_endX * 0.18;
        m_orig_x2 = m_endX * 0.82;
        m_orig_y1 = depth + 1.0;
        m_orig_y2 = depth - 1.0;
        m_orig_startX = 0;
        m_orig_endX = m_endX;
        m_orig_startDirX = m_endX * 0.3;
        m_orig_endDirX = m_endX * 0.7;
        m_offsetXA = 0.0;
        m_offsetYA = 0.0;

        mCurve = new QCPItemCurve(mPlot);
        mCurve->setPen(QPen(m_lineColor, 2));
        mCurve->setLayer("overlay");

        updateCurveFromTargets();
        updateCurvePosition();

        auto createTracer = [this](double x, double y) -> QCPItemTracer* {
            QCPItemTracer *t = new QCPItemTracer(mPlot);
            t->setStyle(QCPItemTracer::tsSquare);
            t->setSize(8);
            t->setPen(QPen(Qt::black, 1));
            t->setBrush(QBrush(Qt::black));
            t->setSelectable(true);
            t->setLayer("overlay");
            t->position->setCoords(x, y);
            t->setVisible(false);
            return t;
        };
        m_tracer1 = createTracer(m_orig_x1 + m_offsetXA, m_orig_y1 + m_offsetYA);
        m_tracer2 = createTracer(m_orig_x2 + m_offsetXA, m_orig_y2 + m_offsetYA);
        m_itemText = new QCPItemText(mPlot);
        m_itemText->setText(m_typeName);
        m_itemText->setFont(QFont("Arial", 6, QFont::Bold));
        m_itemText->setColor(Qt::black);
        m_itemText->position->setCoords(m_orig_x1 + m_offsetXA + 15, m_orig_y1 + m_offsetYA);
        m_itemText->setPositionAlignment(Qt::AlignCenter);
        m_itemText->setLayer("overlay");
        m_labelsC.append(m_itemText);
        updateTracers();
    }
    else if (m_type == TYPE_B) {
        // nothing
    }
    else if (m_type == TYPE_C) {
        m_curveC = new QCPCurve(mPlot->xAxis, mPlot->yAxis);
        m_curveC->setPen(QPen(m_lineColor, 2));
        m_curveC->setScatterStyle(QCPScatterStyle::ssCircle);
        m_curveC->setLineStyle(QCPCurve::lsLine);
        m_curveC->setLayer("overlay");
    }

    mPlot->installEventFilter(this);
    mPlot->replot();
}

TransparentDraggableCrackObject::~TransparentDraggableCrackObject()
{
    if (m_type == TYPE_B) clearLines();
    if (m_type == TYPE_C) clearPolylineC();
    if (s_activeObject == this) s_activeObject = nullptr;
}

void TransparentDraggableCrackObject::isShow(bool is)
{
    this->m_isShow = is;
    if(this->mCurve)
    {
        this->mCurve->setVisible(this->m_isShow);
    }

    if(this->m_curveC)
    {
        this->m_curveC->setVisible(this->m_isShow);
    }

    for (const LineItem &item : m_lines) {
         if (item.line) {
             item.line->setVisible(this->m_isShow);
         }
     }
    this->mPlot->replot();
}

// ========== 模式A辅助 ==========
void TransparentDraggableCrackObject::updateCurveFromTargets()
{
    double t1 = m_orig_x1 / m_endX;
    double t2 = m_orig_x2 / m_endX;
    double u1 = 1 - t1, u2 = 1 - t2;
    double P0x = 0, P0y = m_depth;
    double P3x = m_endX, P3y = m_depth;
    double P1x = m_orig_x1, P2x = m_orig_x2;
    double a11 = 3 * u1 * u1 * t1;
    double a12 = 3 * u1 * t1 * t1;
    double b1 = m_orig_y1 - (u1*u1*u1 * P0y + t1*t1*t1 * P3y);
    double a21 = 3 * u2 * u2 * t2;
    double a22 = 3 * u2 * t2 * t2;
    double b2 = m_orig_y2 - (u2*u2*u2 * P0y + t2*t2*t2 * P3y);
    double det = a11 * a22 - a12 * a21;
    if (fabs(det) > 1e-6) {
        double P1y = (b1 * a22 - a12 * b2) / det;
        double P2y = (a11 * b2 - b1 * a21) / det;
        m_orig_startDirX = P1x;
        m_orig_startDirY = P1y;
        m_orig_endDirX = P2x;
        m_orig_endDirY = P2y;
    }
}

void TransparentDraggableCrackObject::updateCurvePosition()
{
    if (!mCurve) return;
    mCurve->start->setCoords(m_orig_startX + m_offsetXA, m_depth + m_offsetYA);
    mCurve->end->setCoords(m_orig_endX + m_offsetXA, m_depth + m_offsetYA);
    mCurve->startDir->setCoords(m_orig_startDirX + m_offsetXA, m_orig_startDirY + m_offsetYA);
    mCurve->endDir->setCoords(m_orig_endDirX + m_offsetXA, m_orig_endDirY + m_offsetYA);
}

void TransparentDraggableCrackObject::updateTracers()
{
    if (!m_tracer1 || !m_tracer2) return;
    m_tracer1->position->setCoords(m_orig_x1 + m_offsetXA, m_orig_y1 + m_offsetYA);
    m_tracer2->position->setCoords(m_orig_x2 + m_offsetXA, m_orig_y2 + m_offsetYA);
    m_itemText->position->setCoords(m_orig_x1 + m_offsetXA + 15, m_orig_y1 + m_offsetYA);
}

void TransparentDraggableCrackObject::setTracerHighlight(QCPItemTracer *tracer, bool highlight)
{
    if (!tracer) return;
    if (highlight) {
        tracer->setPen(QPen(Qt::red, 2));
        tracer->setBrush(QBrush(Qt::red));
    } else {
        tracer->setPen(QPen(Qt::black, 1));
        tracer->setBrush(QBrush(Qt::black));
        m_tracer1->setVisible(true);
        m_tracer2->setVisible(true);
    }
    mPlot->replot();
}

// ========== 模式B辅助 ==========
void TransparentDraggableCrackObject::updateLineEndpoints(LineItem &item)
{
    item.startTracer->position->setCoords(item.startOrig.x() + m_offsetXB, item.startOrig.y() + m_offsetYB);
    item.endTracer->position->setCoords(item.endOrig.x() + m_offsetXB, item.endOrig.y() + m_offsetYB);
}

void TransparentDraggableCrackObject::updateLinesPosition()
{
    for (auto &item : m_lines) {
        item.line->start->setCoords(item.startOrig.x() + m_offsetXB, item.startOrig.y() + m_offsetYB);
        item.line->end->setCoords(item.endOrig.x() + m_offsetXB, item.endOrig.y() + m_offsetYB);
        updateLineEndpoints(item);
    }
}

void TransparentDraggableCrackObject::clearLines()
{
    for (auto &item : m_lines) {
        mPlot->removeItem(item.line);
        delete item.line;
        if (item.startTracer) { mPlot->removeItem(item.startTracer); delete item.startTracer; }
        if (item.endTracer) { mPlot->removeItem(item.endTracer); delete item.endTracer; }
    }
    m_lines.clear();
    m_isAddingLine = false;
    mPlot->replot();
}

// ========== 模式C辅助 ==========
void TransparentDraggableCrackObject::updatePolylineC(bool closed)
{
    if (!m_curveC) return;
    if (m_pointsC.isEmpty()) {
        m_curveC->setData(QVector<double>(), QVector<double>());
        return;
    }
    QVector<double> xs, ys;
    for (const auto &p : m_pointsC) {
        xs << p.x() + m_offsetXC;
        ys << p.y() + m_offsetYC;
    }
    if (closed && m_pointsC.size() >= 3) {
        xs << m_pointsC.first().x() + m_offsetXC;
        ys << m_pointsC.first().y() + m_offsetYC;
    }
    m_curveC->setData(xs, ys);
}

void TransparentDraggableCrackObject::clearPolylineC()
{
    for (QCPItemText* label : m_labelsC) {
        if (label) {
            // 断开与 mPlot 的父子关系，防止 mPlot 销毁时自动删除
            label->setParent(nullptr);
            delete label;
        }
    }
    m_labelsC.clear();
    m_pointsC.clear();
    if (m_curveC) {
        m_curveC->setData(QVector<double>(), QVector<double>());
    }
    m_offsetXC = m_offsetYC = 0.0;
    m_cFinished = false;
    m_draggingPoint = false;
    m_draggedPointIndex = -1;
    if (s_activeObject == this) s_activeObject = nullptr;
    mPlot->replot();
}

// ========== 状态重置 ==========
void TransparentDraggableCrackObject::deactivate()
{
    qDebug() << "[Deactivate]" << m_uuid;
    if (m_type == TYPE_A) {
        setTracerHighlight(m_tracer1, false);
        setTracerHighlight(m_tracer2, false);
        m_dragStateA = IdleA;
        m_tracer1->setVisible(false);
        m_tracer2->setVisible(false);
    } else if (m_type == TYPE_B) {
        m_dragStateB = IdleB;
        m_draggedLineIndex = -1;
    } else if (m_type == TYPE_C) {
        m_cDragging = false;
        m_draggingPoint = false;
        m_draggedPointIndex = -1;
    }
    mPlot->replot();
}

// ========== 事件过滤器 ==========
bool TransparentDraggableCrackObject::eventFilter(QObject *obj, QEvent *event)
{
    if (obj != mPlot) return false;
    if (event->type() == QEvent::Wheel) return false;

    QMouseEvent *me = static_cast<QMouseEvent*>(event);
    bool shiftPressed = (me->modifiers() & Qt::ShiftModifier);

    // 鼠标按下
    if (event->type() == QEvent::MouseButtonPress && me->button() == Qt::LeftButton) {
        bool hit = false;

        // ========== 模式B：添加直线（优先级最高） ==========
        if (m_type == TYPE_B && shiftPressed) {
            if (!m_isAddingLine) {
                double x = mPlot->xAxis->pixelToCoord(me->pos().x());
                double y = mPlot->yAxis->pixelToCoord(me->pos().y());
                m_tempPoint = QPointF(x - m_offsetXB, y - m_offsetYB);
                m_isAddingLine = true;
                qDebug() << "Start adding line, point:" << m_tempPoint;
                event->accept();
                return true;
            } else {
                double x = mPlot->xAxis->pixelToCoord(me->pos().x());
                double y = mPlot->yAxis->pixelToCoord(me->pos().y());
                QPointF p2(x - m_offsetXB, y - m_offsetYB);
                QCPItemLine *line = new QCPItemLine(mPlot);
                line->setPen(QPen(m_lineColor, 2));
                line->setLayer("overlay");
                auto createTracer = [this](double x, double y, const QColor &color) -> QCPItemTracer* {
                    QCPItemTracer *t = new QCPItemTracer(mPlot);
                    t->setStyle(QCPItemTracer::tsSquare);
                    t->setSize(10);
                    t->setPen(QPen(Qt::black, 1));
                    t->setBrush(QBrush(color));
                    t->setSelectable(true);
                    t->setLayer("overlay");
                    t->position->setCoords(x + m_offsetXB, y + m_offsetYB);
                    return t;
                };
                QCPItemTracer *startTracer = createTracer(m_tempPoint.x(), m_tempPoint.y(), Qt::black);
                QCPItemTracer *endTracer = createTracer(p2.x(), p2.y(), Qt::black);
                LineItem item;
                item.startOrig = m_tempPoint;
                item.endOrig = p2;
                item.line = line;
                item.startTracer = startTracer;
                item.endTracer = endTracer;
                m_lines.append(item);
                updateLinesPosition();
                m_isAddingLine = false;
                mPlot->replot();
                qDebug() << "Line added from" << m_tempPoint << "to" << p2;
                event->accept();
                return true;
            }
        }

        // ========== 模式A ==========
        if (m_type == TYPE_A && !shiftPressed) {
            QPointF pixel = me->localPos();
            double d1 = m_tracer1->selectTest(pixel, false);
            double d2 = m_tracer2->selectTest(pixel, false);
            double curveDist = mCurve->selectTest(pixel, false);
            if (d1 >= 0 && d1 < 15 || d2 >= 0 && d2 < 15 || (curveDist >= 0 && curveDist < 5)) {
                hit = true;
                if (s_activeObject && s_activeObject != this) {
                    s_activeObject->deactivate();
                }
                s_activeObject = this;
                if (d1 >= 0 && d1 < 15) {
                    m_dragStateA = DraggingPoint1;
                    setTracerHighlight(m_tracer1, true);
                } else if (d2 >= 0 && d2 < 15) {
                    m_dragStateA = DraggingPoint2;
                    setTracerHighlight(m_tracer2, true);
                } else {
                    m_dragStateA = DraggingCurveA;
                    m_lastDragPixelA = pixel;
                }
                event->accept();
                return true;
            }
        }

        // ========== 模式B：拖拽（非Shift） ==========
        if (m_type == TYPE_B && !shiftPressed && !m_isAddingLine) {
            QPointF pixel = me->localPos();
            bool found = false;
            for (int i = 0; i < m_lines.size(); ++i) {
                auto &item = m_lines[i];
                if (item.startTracer->selectTest(pixel, false) >= 0 && item.startTracer->selectTest(pixel, false) < 10) {
                    found = true;
                    hit = true;
                    if (s_activeObject && s_activeObject != this) s_activeObject->deactivate();
                    s_activeObject = this;
                    m_dragStateB = DraggingStartPoint;
                    m_draggedLineIndex = i;
                    m_bDragStart = pixel;
                    event->accept();
                    return true;
                }
                if (item.endTracer->selectTest(pixel, false) >= 0 && item.endTracer->selectTest(pixel, false) < 10) {
                    found = true;
                    hit = true;
                    if (s_activeObject && s_activeObject != this) s_activeObject->deactivate();
                    s_activeObject = this;
                    m_dragStateB = DraggingEndPoint;
                    m_draggedLineIndex = i;
                    m_bDragStart = pixel;
                    event->accept();
                    return true;
                }
            }
            if (!found) {
                for (int i = 0; i < m_lines.size(); ++i) {
                    double dist = m_lines[i].line->selectTest(pixel, false);
                    if (dist >= 0 && dist < 3) {
                        hit = true;
                        if (s_activeObject && s_activeObject != this) s_activeObject->deactivate();
                        s_activeObject = this;
                        m_dragStateB = DraggingLineOverall;
                        m_bDragStart = pixel;
                        event->accept();
                        return true;
                    }
                }
            }
        }

        // ========== 模式C ==========
        if (m_type == TYPE_C) {
            // 1. 左键添加点（Shift）
            if (shiftPressed && me->button() == Qt::LeftButton && !m_cFinished) {
                if (s_activeObject != this) {
                    if (s_activeObject) s_activeObject->deactivate();
                    s_activeObject = this;
                }
                double x = mPlot->xAxis->pixelToCoord(me->pos().x());
                double y = mPlot->yAxis->pixelToCoord(me->pos().y());
                QPointF pt(x - m_offsetXC, y - m_offsetYC);
                m_pointsC.append(pt);
                QCPItemText *label = new QCPItemText(mPlot);
                label->setText("  ");
                label->setFont(QFont("Arial", 6, QFont::Bold));
                label->setColor(Qt::black);
                label->setBrush(QBrush(Qt::black));
                label->setPen(QPen(Qt::black, 1));
                label->position->setCoords(x, y);
                label->setPositionAlignment(Qt::AlignCenter);
                label->setLayer("overlay");
                m_labelsC.append(label);
                updatePolylineC(false);
                mPlot->replot();
                event->accept();
                return true;
            }
            // 2. 左键空白闭环（非Shift，未完成时）
            if (!shiftPressed && me->button() == Qt::LeftButton && !m_cFinished) {
                if (m_pointsC.size() >= 3) {
                    m_cFinished = true;
                    updatePolylineC(true);
                    mPlot->replot();
                } else {
                    clearPolylineC();
                }
                if (s_activeObject == this) {
                    s_activeObject->deactivate();
                    s_activeObject = nullptr;
                }
                event->accept();
                return true;
            }
            // 3. 拖拽整体或点（已完成，非Shift左键）
            if (!shiftPressed && me->button() == Qt::LeftButton && m_cFinished) {
                QPointF pixel = me->localPos();
                // 优先检测是否命中某个数据点（通过标签）
                int hitPointIndex = -1;
                for (int i = 0; i < m_labelsC.size(); ++i) {
                    double dist = m_labelsC[i]->selectTest(pixel, false);
                    if (dist >= 0 && dist < 10) {
                        hitPointIndex = i;
                        break;
                    }
                }
                if (hitPointIndex >= 0) {
                    hit = true;
                    if (s_activeObject != this) {
                        if (s_activeObject) s_activeObject->deactivate();
                        s_activeObject = this;
                    }
                    m_draggingPoint = true;
                    m_draggedPointIndex = hitPointIndex;
                    // 记录拖拽开始时的鼠标像素坐标和点的原始坐标（用于计算偏移）
                    m_cDragStart = pixel;
                    event->accept();
                    return true;
                } else {
                    // 未命中点，检测曲线本体
                    double curveDist = m_curveC ? m_curveC->selectTest(pixel, false) : -1;
                    if (curveDist >= 0 && curveDist < 3) {
                        hit = true;
                        if (s_activeObject != this) {
                            if (s_activeObject) s_activeObject->deactivate();
                            s_activeObject = this;
                        }
                        m_cDragging = true;
                        m_cDragStart = pixel;
                        event->accept();
                        return true;
                    } else {
                        // 未命中任何图元，清除活动对象
                        if (s_activeObject == this) {
                            s_activeObject->deactivate();
                            s_activeObject = nullptr;
                        }
                        return false;
                    }
                }
            }
        }

        // 未命中任何图元：清除全局活动对象
        if (!hit) {
            if (s_activeObject) {
                s_activeObject->deactivate();
                s_activeObject = nullptr;
            }
            return false;
        }
        return false;
    }

    // 鼠标移动
    if (event->type() == QEvent::MouseMove) {
        if (s_activeObject != this) return false;

        // 模式A移动
        if (m_type == TYPE_A) {
            if (m_dragStateA == DraggingPoint1 || m_dragStateA == DraggingPoint2) {
                double newY = mPlot->yAxis->pixelToCoord(me->localPos().y());
                double currentY = (m_dragStateA == DraggingPoint1) ? m_orig_y1 : m_orig_y2;
                double deltaY = newY - (currentY + m_offsetYA);
                if (fabs(deltaY) > 5) deltaY = (deltaY > 0 ? 5 : -5);
                double newOrigY = currentY + deltaY;
                double minY = m_depth - 100;
                double maxY = m_depth + 100;
                newOrigY = qBound(minY, newOrigY, maxY);
                if (m_dragStateA == DraggingPoint1) m_orig_y1 = newOrigY;
                else m_orig_y2 = newOrigY;
                updateCurveFromTargets();
                updateCurvePosition();
                updateTracers();
                mPlot->replot();
                return true;
            } else if (m_dragStateA == DraggingCurveA) {
                QPointF current = me->localPos();
                double oldX = mPlot->xAxis->pixelToCoord(m_lastDragPixelA.x());
                double newX = mPlot->xAxis->pixelToCoord(current.x());
                double oldY = mPlot->yAxis->pixelToCoord(m_lastDragPixelA.y());
                double newY = mPlot->yAxis->pixelToCoord(current.y());
                double dx = newX - oldX;
                double dy = newY - oldY;
                m_offsetXA += dx;
                m_offsetYA += dy;
                updateCurvePosition();
                updateTracers();
                mPlot->replot();
                m_lastDragPixelA = current;
                return true;
            }
        }
        // 模式B移动
        else if (m_type == TYPE_B && m_dragStateB != IdleB) {
            QPointF current = me->localPos();
            double oldX = mPlot->xAxis->pixelToCoord(m_bDragStart.x());
            double newX = mPlot->xAxis->pixelToCoord(current.x());
            double oldY = mPlot->yAxis->pixelToCoord(m_bDragStart.y());
            double newY = mPlot->yAxis->pixelToCoord(current.y());
            double dx = newX - oldX;
            double dy = newY - oldY;
            if (m_dragStateB == DraggingLineOverall) {
                m_offsetXB += dx;
                m_offsetYB += dy;
                updateLinesPosition();
            } else if (m_dragStateB == DraggingStartPoint || m_dragStateB == DraggingEndPoint) {
                int idx = m_draggedLineIndex;
                if (idx >= 0 && idx < m_lines.size()) {
                    LineItem &item = m_lines[idx];
                    if (m_dragStateB == DraggingStartPoint) {
                        item.startOrig.rx() += dx;
                        item.startOrig.ry() += dy;
                    } else {
                        item.endOrig.rx() += dx;
                        item.endOrig.ry() += dy;
                    }
                    item.line->start->setCoords(item.startOrig.x() + m_offsetXB, item.startOrig.y() + m_offsetYB);
                    item.line->end->setCoords(item.endOrig.x() + m_offsetXB, item.endOrig.y() + m_offsetYB);
                    updateLineEndpoints(item);
                }
            }
            mPlot->replot();
            m_bDragStart = current;
            return true;
        }
        // 模式C移动
        // 模式C移动
        else if (m_type == TYPE_C) {
            if (m_cDragging) {
                // 整体拖拽
                QPointF current = me->localPos();
                double oldX = mPlot->xAxis->pixelToCoord(m_cDragStart.x());
                double newX = mPlot->xAxis->pixelToCoord(current.x());
                double oldY = mPlot->yAxis->pixelToCoord(m_cDragStart.y());
                double newY = mPlot->yAxis->pixelToCoord(current.y());
                double dx = newX - oldX;
                double dy = newY - oldY;
                m_offsetXC += dx;
                m_offsetYC += dy;
                for (int i = 0; i < m_pointsC.size(); ++i) {
                    m_labelsC[i]->position->setCoords(m_pointsC[i].x() + m_offsetXC, m_pointsC[i].y() + m_offsetYC);
                }
                updatePolylineC(m_cFinished && m_pointsC.size() >= 3);
                mPlot->replot();
                m_cDragStart = current;
                return true;
            } else if (m_draggingPoint) {
                // 点拖拽：支持二维移动
                QPointF current = me->localPos();
                // 计算鼠标在轴坐标系下的移动量（直接使用像素转坐标，但为了精确，计算差值）
                double oldX = mPlot->xAxis->pixelToCoord(m_cDragStart.x());
                double newX = mPlot->xAxis->pixelToCoord(current.x());
                double oldY = mPlot->yAxis->pixelToCoord(m_cDragStart.y());
                double newY = mPlot->yAxis->pixelToCoord(current.y());
                double dx = newX - oldX;
                double dy = newY - oldY;
                // 更新点的原始坐标
                m_pointsC[m_draggedPointIndex].rx() += dx;
                m_pointsC[m_draggedPointIndex].ry() += dy;
                // 更新标签位置
                m_labelsC[m_draggedPointIndex]->position->setCoords(m_pointsC[m_draggedPointIndex].x() + m_offsetXC,
                                                                    m_pointsC[m_draggedPointIndex].y() + m_offsetYC);
                updatePolylineC(m_cFinished && m_pointsC.size() >= 3);
                mPlot->replot();
                // 更新拖拽起始点
                m_cDragStart = current;
                return true;
            }
        }

        return false;
    }

    // 鼠标释放
    if (event->type() == QEvent::MouseButtonRelease && me->button() == Qt::LeftButton) {
        if (s_activeObject != this) return false;

        if (m_type == TYPE_A && m_dragStateA != IdleA) {
            setTracerHighlight(m_tracer1, false);
            setTracerHighlight(m_tracer2, false);
            m_dragStateA = IdleA;
            return true;
        } else if (m_type == TYPE_B && m_dragStateB != IdleB) {
            m_dragStateB = IdleB;
            m_draggedLineIndex = -1;
            return true;
        } else if (m_type == TYPE_C) {
            if (m_cDragging) {
                m_cDragging = false;
                return true;
            } else if (m_draggingPoint) {
                m_draggingPoint = false;
                m_draggedPointIndex = -1;
                return true;
            }
        }
    }

    return false;
}