跪求正弦动态曲线demo参考

[trustguan]

研究了一个星期，还是没有成功搞出来，请高手指点

[a549934338]

widget.h文件 #include <QtGui/QWidget> class Widget : public QWidget { Q_OBJECT public: Widget(QWidget *parent = 0); ~Widget(); protected: void paintEvent(QPaintEvent *event); private: int buffer[400]; }; widget.cpp文件 #include "Widget.h" #include "math.h" #include <QPainter> #define PI 3.1415926 Widget::Widget(QWidget *parent) : QWidget(parent) { setSizePolicy(QSizePolicy::Minimum,QSizePolicy::Minimum); setBackgroundRole(QPalette::Dark); resize(320, 240); setWindowTitle(tr("Paint Demo")); for( int i=0; i<400; i++ ) { buffer[i] = (int)( sin( (i*PI) /100 ) * 70 ); } } void Widget::paintEvent(QPaintEvent *event) { QPainter painter(this); QPoint beginPoint; QPoint endPoint; painter.setPen( Qt::blue ); for( int i=0; i<399; i++ ) { beginPoint.setX( i ); beginPoint.setY( buffer[i]+100 ); endPoint.setX( i+1 ); endPoint.setY( buffer[i+1]+100 ); painter.drawLine( beginPoint, endPoint ); } }

[a549934338]

上面是静态的；动态加Timer： .h文件： #include <QtGui/QWidget> #include <QTimer> class Widget : public QWidget { Q_OBJECT public: Widget(QWidget *parent = 0); ~Widget(); protected: void paintEvent(QPaintEvent *event); private slots: void flushBuff(); private: int buffer[400]; QTimer *timer; }; cpp文件： #include "Widget.h" #include "math.h" #include <QPainter> #define PI 3.1415926 Widget::Widget(QWidget *parent) : QWidget(parent) { setSizePolicy(QSizePolicy::Minimum,QSizePolicy::Minimum); setBackgroundRole(QPalette::Dark); resize(320, 240); setWindowTitle(tr("Paint Demo")); for( int i=0; i<400; i++ ) { buffer[i] = (int)( sin( (i*PI) /100 ) * 70 ); } QTimer *timer = new QTimer(this); connect( timer, SIGNAL(timeout()), this, SLOT(flushBuff())); timer->start( 20 ); } void Widget::paintEvent(QPaintEvent *event) { QPainter painter(this); QPoint beginPoint; QPoint endPoint; painter.setPen( Qt::blue ); for( int i=0; i<399; i++ ) { beginPoint.setX( i ); beginPoint.setY( buffer[i]+100 ); endPoint.setX( i+1 ); endPoint.setY( buffer[i+1]+100 ); painter.drawLine( beginPoint, endPoint ); } } void Widget::flushBuff() { int tmp = buffer[0]; int i; for( i=0; i<400; i++ ) { buffer[i] = buffer[i+1]; } buffer[399] = tmp; update(); }

[「已注销」]

引用 2 楼 a549934338 的回复:

上面是静态的；动态加Timer： .h文件： #include <QtGui/QWidget> #include <QTimer> class Widget : public QWidget { Q_OBJECT public: Widget(QWidget *parent = 0); ~Widget(); pr……

实在太感谢你了！