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  1. #include "widget.h"
  2. #include <QPainter>
  3. #include <cmath>
  4.  
  5. Widget::Widget(QWidget *parent)
  6.     : QWidget(parent)
  7. {
  8.     startTimer(40);
  9. }
  10.  
  11. Widget::~Widget()
  12. {
  13.  
  14. }
  15. void Widget::paintEvent(QPaintEvent *event)
  16. {
  17.     QPainter p(this);
  18.     p.setRenderHint(QPainter::Antialiasing);
  19.     double w, h, left, top;
  20.     const auto p=4./3;
  21.     if (width() < r*height()){
  22.         //b
  23.         w = width();
  24.         h = w/r;
  25.         left = 0;
  26.         top = (height() - h)/2
  27.     }
  28.     else{
  29.         //a
  30.         h = hight();
  31.         w = h*r;
  32.         left = (width() - w)/2
  33.         top = 0;
  34.     }
  35.     auto blackRadius = 0.1*h+m_time*100;
  36.     if (blackRadius <h)
  37.     {
  38.         p.setPen(Qt::NoPen);
  39.         p.setBrush(Qt::black);
  40.         QPointF blackCenter (left+0.5*w, top+0.5*h);
  41.         p.drawEllipse(blackCenter, blackRadius, blackRadius);
  42.     }
  43.     else {
  44.         auto darkGrayRadius = 0.1*h+m_time*100;
  45.         p.setPen(Qt::NoPen);
  46.         p.setBrush(Qt::darkGray);
  47.         QPointF darkGrayCenter (left+0.5*w, top+0.5*h);
  48.         p.drawEllipse(darkGrayCenter, darkGrayRadius, darkGrayRadius);
  49.     }
  50. }
  51.  
  52. void Widget::timerEvent(QTimerEvent *)
  53. {
  54.     autodt=40/1000.;
  55.     m_time +=dt;
  56. update();
  57. }
  58.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp:1:20: fatal error: widget.h: No such file or directory
 #include "widget.h"
                    ^
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/4tvqLc
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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