Hi everyone,
i am working on a project where i need to draw lot of polygons. Is there any way to draw it without Timer? I am using QPainter... My problem is that i dont know how to draw a lot of polygons in short time, miliseconds.

Here is my code,
Qt Code: 
  1. #include "widget.h"
  2. #include "ui_widget.h"
  3. #include "polygonpoints.h"
  4.  
  5.  
  6. Widget::Widget(QWidget *parent) :
  7.     QWidget(parent),
  8.     ui(new Ui::Widget)
  9. {
  10.     ui->setupUi(this);
  11.  
  12.  
  13.     timer = new QTimer(this);
  14.     connect(timer, SIGNAL(timeout()), this, SLOT(AdvanceState()));
  15.     timer->start(1);
  16.  
  17. }
  18.  
  19. Widget::~Widget()
  20. {
  21.     delete ui;
  22. }
  23. void Widget::AdvanceState(){
  24.     this->setAttribute(Qt::WA_NoSystemBackground,true);
  25.     if(brojac<300){
  26.        update();
  27.      std::cout << ++brojac << std::endl;
  28. }
  29. }
  30.  
  31. void Widget::paintEvent(QPaintEvent *event)
  32. {
  33.  
  34.     //std::cout << ++brojac << std::endl;
  35.     QPainter painter(this);
  36.     painter.setRenderHint(QPainter::Antialiasing, true);
  37.     int N=9; // broj vrhova
  38.     x.set_x(N);
  39.     x.generate();
  40.     //int N = 4; //broj vrhova
  41.     QPointF *points = new QPointF[N];
  42.     for(int i = 0; i < N; ++i){
  43.         points[i].setX(x.vertices[i].get(0));
  44.         points[i].setY(x.vertices[i].get(1));
  45.     }
  46.  
  47.     painter.setPen(Qt::NoPen);
  48.     painter.setBrush(QBrush(QColor(qrand() % 255, qrand() % 255, qrand() % 255, 128)));
  49.     painter.drawPolygon(points,N);
  50.  
  51.     delete[] points;
  52.  
  53. }
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