求圆面积2
本帖最后由 ～风介～ 于 2015-11-20 20:01 编辑code://countcirclearea.h
#ifndef COUNTCIRCLEAREA_H
#define COUNTCIRCLEAREA_H
#include <QDialog>
QT_BEGIN_NAMESPACE
class QLabel;
class QLineEdit;
class QPushButton;
QT_END_NAMESPACE
class CountCircleArea : public QDialog
{
Q_OBJECT
public:
CountCircleArea(QWidget *parent = 0);
private:
QLabel *label1,*label2;
QLineEdit *lineEdit1;
//QPushButton *button1;
private slots:
void showArea();
};
#endif // COUNTCIRCLEAREA_H
===============================
//countcirclearea.cpp
#include "countcirclearea.h"
#include <QtWidgets>
const static double PI = 3.1416;
CountCircleArea::CountCircleArea(QWidget *parent)
: QDialog(parent)
{
label1 = new QLabel(tr("Input Radius:"));
label2 = new QLabel;
lineEdit1 = new QLineEdit(tr("I Love FishC.com!"));
//button1 = new QPushButton("Display Area");
//QObject::connect(button1,SIGNAL(clicked()),this,SLOT(showArea()));
QObject::connect(lineEdit1,SIGNAL(textChanged(QString)),this,SLOT(showArea()));
QGridLayout *mainLayout = new QGridLayout;
mainLayout ->addWidget(label1,0,0);
mainLayout ->addWidget(lineEdit1,0,1);
mainLayout ->addWidget(label2,1,0);
//mainLayout ->addWidget(button1,1,1);
setLayout(mainLayout);
}
void CountCircleArea::showArea()
{
bool ok;
QString tempStr;
QString valueStr = lineEdit1->text();
int valueInt = valueStr.toInt(&ok);
double area = valueInt*valueInt*PI;
label2->setText((tempStr.setNum(area)));
}
remark:
仅部分代码，具体参考：http://bbs.fishc.com/forum.php?mod=viewthread&tid=53147#lastpost
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