layout_widget.cpp

#include "layout_widget.h"

void LayoutWidget::initialize_transform() {
  globalTransform.reset();
  auto r = rect();
  qreal scaleX = (r.width() - 5) / sheet.width();
  qreal scaleY = (r.height() - 5) / sheet.height();
  qreal scale = qMin(scaleX, scaleY);
  globalTransform.translate(r.center().rx() - sheet.center().rx() * scale,
                            r.center().ry() - sheet.center().ry() * scale);
  globalTransform.scale(scale, scale);
}

void LayoutWidget::set_sheet(qreal w, qreal h) {
  sheet = QRectF(0, 0, w, h);
}

void LayoutWidget::initializeGL() {
  initializeOpenGLFunctions();
  initialize_transform();
  glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
}

void LayoutWidget::paintEvent(QPaintEvent* event) {
  QPainter painter;
  painter.begin(this);
  painter.setRenderHint(QPainter::Antialiasing);
  painter.fillRect(rect(), Qt::white);
  painter.save();

  qreal scaledPenWidth = 2.0 / globalTransform.m11();
  QPen scaledPen = painter.pen();
  scaledPen.setWidthF(scaledPenWidth);

  // 设置sheet边界线更宽
  QPen sheetPen = scaledPen;
  sheetPen.setWidthF(sheetPen.widthF() * 1.5);

  // 绘制sheet
  painter.setTransform(globalTransform);
  painter.setPen(sheetPen);
  painter.drawRect(sheet);

  // 绘制多边形
  QPen polygonPen = scaledPen;  // 使用相同的线宽
  painter.setPen(polygonPen);
  painter.setBrush(Qt::gray);
  for (auto& p : layout) {
    painter.drawPolygon(p);
  }

  painter.restore();
  painter.end();
}

void LayoutWidget::wheelEvent(QWheelEvent* event) {
  // 处理鼠标滚轮事件来实现缩放
  // 获取滚轮滚动的角度
  int delta = event->angleDelta().y();
  QPointF mousePos = event->position();
  auto mapPt = globalTransform.inverted().map(mousePos);
  qreal mapX = mapPt.x();
  qreal mapY = mapPt.y();
  // 计算缩放因子
  qreal scaleFactor = 1.1;  // 缩放因子可以根据需要调整
  if (event->angleDelta().y() < 0) {
    scaleFactor = 1.0 / scaleFactor;  // 向下滚动进行缩小
  }
  globalTransform.translate(mapX, mapY);
  globalTransform.scale(scaleFactor, scaleFactor);
  globalTransform.translate(-mapX, -mapY);
  update();
}

void LayoutWidget::mousePressEvent(QMouseEvent* event) {
  if (event->button() == Qt::LeftButton) {
    // 记录鼠标点击位置
    m_lastPos = event->pos();
  }
}

void LayoutWidget::mouseMoveEvent(QMouseEvent* event) {
  if (event->buttons() & Qt::LeftButton) {
    // 计算鼠标移动的距离
    QPointF delta = event->pos() - m_lastPos;
    // 更新平移的距离
    globalTransform.translate(delta.x() / globalTransform.m11(),
                              delta.y() / globalTransform.m22());
    // 重新绘制
    update();
    // 更新lastPos
    m_lastPos = event->pos();
  }
}

void LayoutWidget::layoutUpdate(QTableWidgetItem* n, QTableWidgetItem* o) {
  qDebug() << "layoutUpdate START";
  if (n != nullptr) {
    qDebug() << "n: " << n->data(Qt::DisplayRole);
    qDebug() << "o: " << n->data(Qt::DisplayRole);
    auto i = n->tableWidget()->item(n->row(), 0);
    auto v = i->data(Qt::UserRole).value<QList<QPolygonF>>();
    auto len = i->data(Qt::DisplayRole).value<qreal>();
    for (auto& p : v) {
      qDebug() << p;
    }
    this->layout = v;
    this->length = len;
    initialize_transform();
    update();
  }
}