更新文档

other/drawrect/widget.cpp

@@ -0,0 +1,42 @@
+#include "widget.h"
+#include "ui_widget.h"
+#include "qpainter.h"
+#include "qtimer.h"
+#include "qdebug.h"
+
+Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget)
+{
+    ui->setupUi(this);
+
+    interval = 20;
+    count = 500;
+    this->setWindowTitle(QString("随机大量矩形  帧率: %1  数量: %2 (QQ: 517216493 WX: feiyangqingyun)").arg(1000 / interval).arg(count));
+
+    //定时器测试速度
+    QTimer *timer = new QTimer(this);
+    connect(timer, SIGNAL(timeout()), this, SLOT(update()));
+    timer->start(interval);
+}
+
+Widget::~Widget()
+{
+    delete ui;
+}
+
+void Widget::paintEvent(QPaintEvent *)
+{
+    int width = this->width();
+    int height = this->height();
+    QPainter painter(this);
+
+    QPen pen;
+    pen.setWidth(2);
+    pen.setColor(Qt::red);
+    painter.setPen(pen);
+
+    for (int i = 0; i < count; ++i) {
+        int x = rand() % width;
+        int y = rand() % height;
+        painter.drawRect(x, y, 30, 30);
+    }
+}