28.开始画面和异形窗口

• 开始画面

  #include "widget.h"
  #include <QApplication>
   3 #include <QSplashScreen>
  
  int main(int argc, char *argv[])
  {
      QApplication a(argc, argv);
   8     QPixmap pix("16.png");
   9     QSplashScreen splash(pix);
  10     splash.show();
  
      a.processEvents();
      Widget w;
      w.show();
  
      return a.exec();
  }

• 异形窗口
• widget.h

  #ifndef WIDGET_H
  #define WIDGET_H
  
  #include <QWidget>
  
  namespace Ui {
  class Widget;
  }
  
  class Widget : public QWidget
  {
      Q_OBJECT
  
  public:
      explicit Widget(QWidget *parent = 0);
      ~Widget();
  17     void paintEvent(QPaintEvent *);
  
  private:
      Ui::Widget *ui;
  };
  
  #endif // WIDGET_H

• widget.cpp

  #include "widget.h"
  #include "ui_widget.h"
  #include <QPixmap>
  #include <QBitmap>
  #include <QPainter>
  
  Widget::Widget(QWidget *parent) :
      QWidget(parent),
      ui(new Ui::Widget)
  {
     // ui->setupUi(this);
  12     QPixmap pix;
  13     pix.load("16.png",0,Qt::AvoidDither | Qt::ThresholdAlphaDither|Qt::ThresholdDither);
  14     resize(pix.size());
  15     setMask(QBitmap(pix.mask()));//初始化
  }
  
  Widget::~Widget()
  {
      delete ui;
  }
  
     //创建绘画事件
  void Widget::paintEvent(QPaintEvent *)
  {
  25     QPainter painter(this);
  26     painter.drawPixmap(0,0,QPixmap("16.png"));
  }