[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fGBefvVDZuKo4D1NUJeOoz7JuhYmEHMKDvB7sdwk1Ylc":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2025-12-03 07:57:15",248585150,[8,9,10,11],"setColor()","setStyle()","setWidth()","setJoinStyle()",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},16,"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","work_48413407","作业2 事件及画图","通过调用QPen类的()函数可以设置画笔线条宽度",[21,33,43,49,54,59,64,73,76,85],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2025-12-26 03:05:59",239250213,[26,27,28,29],"李鸿章","康有为","孙中山","梁启超","大民族主义者是()提出来","v1",0,{"answer":34,"createTime":23,"id":35,"options":36,"question":41,"source":31,"type":42},[],239250214,[37,38,39,40],""华夷有别"","五族共和","驱除鞑虏、恢复中华","民族平等、民族自治","孙中山民族思想转变的内容包括()",1,{"answer":44,"createTime":5,"id":45,"options":46,"question":47,"source":31,"type":48},[],248585145,[],"程序分析题:下面的代码段实现在自定义Widget窗口中按下鼠标左键时,弹出"您按下了左键"的消息框;按下鼠标右键时,弹出"您按下了右键"的消息框.类中采用了默认的事件处理函数,请完善程序. void Widget:: ( QMouseEvent ) { if(event->button() == ) QMessageBox::information(this,"提示","您按下了左键"); else QMessageBox::information(this, "提示","您按下了右键"); }",2,{"answer":50,"createTime":5,"id":51,"options":52,"question":53,"source":31,"type":48},[],248585146,[],"程序分析题: 已知程序运行后,运行效果如图所示,请完成代码段的填空. \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fbb1a3186e61c2b21eef3c824b9c72203.png\"> void Widget::paintEvent(QPaintEvent *) { QPainter ;\u002F\u002F创建画家对象 QRectF rectangle(50,50,200,100); painter.drawRect(rectangle); painter. (50,30,"图形绘制");\u002F\u002F绘制文字 QPen pen; pen.setColor(Qt::red); pen.setWidth(3); ;\u002F\u002F设置画笔 painter.drawArc(rectangle,0,90*16); pen.setColor(Qt::blue); QBrush brush; brush.setColor(Qt::green); brush.setStyle(Qt::CrossPattern); painter.setPen(pen); painter.setBrush(brush); painter. ;\u002F\u002F绘制曲线 }",{"answer":55,"createTime":5,"id":56,"options":57,"question":58,"source":31,"type":48},[],248585147,[],"程序分析题:已知程序运行界面如图所示,未使用界面设计师,请在主窗口构造函数中填空,以完成界面的设计. \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F66e27ab41c2c5224e94d2e6484ed6a4e.png\"> MainWindow::MainWindow(QWidget *parent): QMainWindow(parent),ui(new Ui::MainWindow) { ui->setupUi(this); this->setWindowTitle("ch7exam2_2"); QToolButton *toolBtn = new QToolButton(ui->mainToolBar); toolBtn->setText(tr("退出")); ;\u002F\u002F添加工具栏 QCalendarWidget *calendar=new QCalendarWidget(this); ;\u002F\u002Fcalendar填充中心区域 (new QLabel("永久信息"));\u002F\u002F状态栏显示永久信息 }",{"answer":60,"createTime":5,"id":61,"options":62,"question":63,"source":31,"type":48},[],248585148,[],"程序分析题: 程序的功能为:运行时首先打开一个文件对话框请用户选择一个文件;然后打开一个字体对话框,请用户选择一个字体;最后打开一个带有标签部件的窗口,标签中显示的文字为用户选择文件的文件名(若未选择,显示默认的字符串"label")、字体为用户设置的字体(若未设置,使用默认字体).请填空. #include<QApplication> #include<QFont> #include<QLabel> #include<QFontDialog> int main(int argc,char* argv[]) { QApplication a(argc,argv); QString filename=___________ (nullptr,"请选择一个文件");\u002F\u002F打开文件对话框 bool isOK; _____ font=___________ (&isOK,nullptr);\u002F\u002F打开字体对话框,选择字体 QWidget w; QLabel label("label",&w); if(!filename.isEmpty()) label.setText(filename); if( ) label.setFont(font); w.show(); a.exec(); }",{"answer":65,"createTime":5,"id":66,"options":67,"question":72,"source":31,"type":32},[],248585149,[68,69,70,71],"QObject","QPaintDevice","QWidget","QEvent","QPainter可以在继承自( )类的任何对象上进行绘制操作",{"answer":74,"createTime":5,"id":6,"options":75,"question":19,"source":31,"type":32},[],[8,9,10,11],{"answer":77,"createTime":5,"id":78,"options":79,"question":84,"source":31,"type":32},[],248585151,[80,81,82,83],"QImage","QPixmap","QPicture","QFile","对象不是Qt的绘图设备",{"answer":86,"createTime":5,"id":87,"options":88,"question":93,"source":31,"type":32},[],248585152,[89,90,91,92],"QFontInfo","QFont","QFontDialog","QFontMetrics","使用QPainter::setFont()函数可以对绘制的文字进行设置,该函数的参数是一个()对象"]