qt打印预览 画图问题
print::print(QWidget *parent) :
QWidget(parent),
ui(new Ui::print)
{
ui->setupUi(this);
connect(ui->b2, SIGNAL(clicked()), this, SLOT(printview()));
}
print::~print()
{
delete ui;
}
void print::printview(){
QPrinter printer;
QPrintPreviewDialog printview(&printer, this);
printview.setMinimumSize(800,700);
connect(&printview, SIGNAL(paintRequested(QPrinter *)),this,SLOT(printPreview(QPrinter *)));
printview.exec();
}
void print::printPreview(QPrinter *printer){
printer->setPageSize(QPrinter::A4);
QPainter painter(printer);
painter.drawRect(30, 30, 500,500);// 画个矩形
add_data(printer);
}
void print::add_data(QPrinter *printer){
QPainter painter(printer);
painter.drawLine(0, 0, 600, 600);// 画一条线
}
问题:只能画出矩形 而直线画不出来 为什么啊 该怎么做才能都画出来啊 不能把painter.drawRect和pinter.drawLine放到同一个函数里 像我那样放到两个函数里 这个问题该怎么解决