Qt Qbrush问题

发布于 2024-08-24 02:04:27 字数 832 浏览 3 评论 0原文

以下代码有什么区别，

  QGraphicsScene * scence = new QGraphicsScene();

   QBrush *brush = new QBrush((QColor(60,20,20)));
   scence->setBackgroundBrush(*brush);

   QGraphicsView *view = new QGraphicsView();
   view->setScene(scence);
   //view->setBackgroundBrush(*brush);
   //view->setCacheMode(QGraphicsView::CacheBackground);
   view->showFullScreen();

给出黑色背景，

  QGraphicsScene * scence = new QGraphicsScene();

   QBrush *brush = new QBrush();
   brush->setColor(QColor(60,20,20));
   scence->setBackgroundBrush(*brush);

   QGraphicsView *view = new QGraphicsView();
   view->setScene(scence);
   //view->setBackgroundBrush(*brush);
   //view->setCacheMode(QGraphicsView::CacheBackground);
   view->showFullScreen();

但什么也没有给出。

原文

What is the difference in the following code,

  QGraphicsScene * scence = new QGraphicsScene();

   QBrush *brush = new QBrush((QColor(60,20,20)));
   scence->setBackgroundBrush(*brush);

   QGraphicsView *view = new QGraphicsView();
   view->setScene(scence);
   //view->setBackgroundBrush(*brush);
   //view->setCacheMode(QGraphicsView::CacheBackground);
   view->showFullScreen();

gives black color background

  QGraphicsScene * scence = new QGraphicsScene();

   QBrush *brush = new QBrush();
   brush->setColor(QColor(60,20,20));
   scence->setBackgroundBrush(*brush);

   QGraphicsView *view = new QGraphicsView();
   view->setScene(scence);
   //view->setBackgroundBrush(*brush);
   //view->setCacheMode(QGraphicsView::CacheBackground);
   view->showFullScreen();

it gives nothing.

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傲性难收 2024-08-31 02:04:27

正如 Qt 文档所说：

QBrush::QBrush ()
构造一个样式为 Qt::NoBrush 的默认黑色画笔（即该画笔不会填充形状）。

在第二个示例中，您必须通过 setStyle 设置 QBrush 对象的样式()，例如使用 Qt::SolidPattern。

   QGraphicsScene * scence = new QGraphicsScene();
   QBrush *brush = new QBrush();
   brush->setStyle(Qt::SolidPattern); // Fix your problem !
   brush->setColor(QColor(60,20,20));
   scence->setBackgroundBrush(*brush);

   QGraphicsView *view = new QGraphicsView();
   view->setScene(scence);
   //view->setBackgroundBrush(*brush);
   //view->setCacheMode(QGraphicsView::CacheBackground);
   view->showFullScreen();

希望有帮助！

As the Qt doc says :

QBrush::QBrush ()
Constructs a default black brush with the style Qt::NoBrush (i.e. this brush will not fill shapes).

In your second example, you have to set the style of the QBrush object by setStyle(), for example with Qt::SolidPattern.

   QGraphicsScene * scence = new QGraphicsScene();
   QBrush *brush = new QBrush();
   brush->setStyle(Qt::SolidPattern); // Fix your problem !
   brush->setColor(QColor(60,20,20));
   scence->setBackgroundBrush(*brush);

   QGraphicsView *view = new QGraphicsView();
   view->setScene(scence);
   //view->setBackgroundBrush(*brush);
   //view->setCacheMode(QGraphicsView::CacheBackground);
   view->showFullScreen();

Hope it helps !

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憧憬巴黎街头的黎明 2024-08-31 02:04:27

实现相同结果的另一种方法是将颜色放入画笔构造函数中，并应用默认的实体样式：

 QBrush *brush = new QBrush (QColor (60, 20, 20));

采用颜色的构造函数有一个可选的样式参数，默认为 Qt::SolidPattern。两种方法产生相同的结果，但这种方法少用了两行代码。

An alternate approach that achieves the same result is to put the color in the brush constructor, and that applies a default style of solid:

 QBrush *brush = new QBrush (QColor (60, 20, 20));

The constructors that take a color have an optional parameter for the style, which defaults to Qt::SolidPattern. Both approaches produce the same result, but this one uses two fewer lines of code.

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~没有更多了~