32.QT绘图

widget.h

 #ifndef WIDGET_H

 #define WIDGET_H

 #include <QWidget>

 #include <QPainter>

 #include <QPen>

 #include <QEvent>

 namespace Ui {

 class Widget;

 }

 class Widget : public QWidget

 {

     Q_OBJECT

 public:

     explicit Widget(QWidget *parent = );

     ~Widget();

20     void paintEvent(QPaintEvent *e);

21     QPainter *painter;



 private:

     Ui::Widget *ui;

 };

 #endif // WIDGET_H

widget.cpp

 #include "widget.h"

 #include "ui_widget.h"

 Widget::Widget(QWidget *parent) :

     QWidget(parent),

     ui(new Ui::Widget)

 {

     ui->setupUi(this);

     setGeometry(,,,);

 }

 Widget::~Widget()

 {

     delete ui;

 }

 void Widget::paintEvent(QPaintEvent *e)

 {

     painter = new QPainter;

     painter->begin(this);

     painter->setPen(QPen(Qt::blue,,Qt::DashDotLine));

     //画刷

     painter->setBrush(QBrush(Qt::red,Qt::SolidPattern));

     //画矩形

     //painter->drawRect(20,20,180,180);

     //画椭圆

     //painter->drawEllipse(20,20,190,160);

     //画点

     //painter->drawPoint(100,100);

     //画曲线

    // painter->drawArc(20,20,210,160,500,1000);

     /*

         case Line:                                             //直线

             p.drawLine(rect.topLeft(),rect.bottomRight());     break;

         case Rectangle:                                        //长方形

             p.drawRect(rect);    break;

         case RoundRect:                                        //圆角方形

             p.drawRoundRect(rect);     break;

         case Ellipse:                                          //椭圆形

             p.drawEllipse(rect);     break;

         case Polygon:                                          //多边形

             p.drawPolygon(points,4);     break;

         case Polyline:                                      //多边线

             p.drawPolyline(points,4);     break;

         case Points:                                          //点

             p.drawPoints(points,4);     break;

         case Arc:                                              //弧

             p.drawArc(rect,startAngle,spanAngle);     break;

         case Path:                                             //路径

             p.drawPath(path);     break;

         case Text:                                            //文字

             p.drawText(rect,Qt::AlignCenter,tr("Hello Qt!"));    break;

         case Pixmap:                                          //图片

             p.drawPixmap(150,150,QPixmap("butterfly.png"));     break;

         default:     break;

        painter->drawLine(QPoint(30,30),QPoint(60,180));

        painter->drawText(this->rect(),Qt::AlignCenter,tr("Hello Qthello haihua!"));

        painter->drawPixmap(150,150,QPixmap("1.png"));

     */

     //画线

     //painter->drawLine(QPoint(30,30),QPoint(60,180));

     //painter->drawText(this->rect(),Qt::AlignCenter,tr("Hello"));

     //画图

     painter->drawPixmap(,,QPixmap("1.png"));

     painter->end();

 }

巴特西

32.QT绘图

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