Question

我有QGraphicsScene和我的物品。我的项继承自QGraphicsObject并覆盖paint方法。

创建项目

 CLoco* newLoco = new CLoco();

   if(Scene)
     Scene->addItem(newLoco);

声明

 class CLoco : public QGraphicsObject
 {
       QBrush oldBrush = painter->brush();
       painter->setBrush(QBrush(color));

       painter->drawEllipse(boundingRect());
       painter->setBrush(oldBrush);

绘画方法

 void CLoco::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
{
  Q_UNUSED(widget);
  QColor color = cColor;

  if (isSelected())
    color = cSelectedColor;
  else
    color = cColor;

  const qreal detalizationLevel = option->levelOfDetailFromTransform(painter->worldTransform());
  CurrentRadius =  TemplateRadius / detalizationLevel + 0.5;

  QBrush oldBrush = painter->brush();
  painter->setBrush(QBrush(color));
  painter->drawEllipse(boundingRect());
  painter->setBrush(oldBrush);
}

我也使用默认的QGraphicsPathItem，我想在绘制这些对象时使用自定义笔。

 QGraphicsPathItem* graphPath = new QGraphicsPathItem(*painterPath);
 QPen pen(Qt::GlobalColor::cyan);
 pen.setWidth(5);
 graphPath->setPen(pen);

在此设置笔之后，所有其他项目均由此青色笔绘制。我是否可以在不创建新类的情况下仅为QGraphicsPathItem使用自定义笔，继承自QGraphicsPathItem并覆盖paint方法？

QA setPen在QAbstractGraphicsShapeItem中设置了所有颜料中的笔

0 个答案: