更新文档

other/drawrect/drawrect.pro

@@ -0,0 +1,13 @@
+QT += core gui
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+greaterThan(QT_MAJOR_VERSION, 5): QT += core5compat
+
+TARGET      = drawrect
+TEMPLATE    = app
+DESTDIR     = $$PWD/../bin
+CONFIG      += warn_off
+
+SOURCES     += main.cpp
+SOURCES     += widget.cpp
+HEADERS     += widget.h
+FORMS       += widget.ui

other/drawrect/main.cpp

@@ -0,0 +1,34 @@
+#pragma execution_character_set("utf-8")
+
+#include "widget.h"
+#include <QApplication>
+#include <QTextCodec>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    QFont font;
+    font.setFamily("Microsoft Yahei");
+    font.setPixelSize(13);
+    a.setFont(font);
+
+#if (QT_VERSION < QT_VERSION_CHECK(5,0,0))
+#if _MSC_VER
+    QTextCodec *codec = QTextCodec::codecForName("gbk");
+#else
+    QTextCodec *codec = QTextCodec::codecForName("utf-8");
+#endif
+    QTextCodec::setCodecForLocale(codec);
+    QTextCodec::setCodecForCStrings(codec);
+    QTextCodec::setCodecForTr(codec);
+#else
+    QTextCodec *codec = QTextCodec::codecForName("utf-8");
+    QTextCodec::setCodecForLocale(codec);
+#endif
+
+    Widget w;
+    //w.setWindowTitle("随机大量矩形 (QQ: 517216493 WX: feiyangqingyun)");
+    w.show();
+
+    return a.exec();
+}

other/drawrect/widget.cpp

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+#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);
+    }
+}

other/drawrect/widget.h

@@ -0,0 +1,27 @@
+#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();
+
+protected:
+    void paintEvent(QPaintEvent *);
+
+private:
+    Ui::Widget *ui;
+    int interval;
+    int count;
+};
+
+#endif // WIDGET_H

other/drawrect/widget.ui

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>Widget</class>
+ <widget class="QWidget" name="Widget">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>800</width>
+    <height>600</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string/>
+  </property>
+ </widget>
+ <layoutdefault spacing="6" margin="11"/>
+ <resources/>
+ <connections/>
+</ui>