技術標籤：Qt

文章為本人在黑馬網路視訊的學習筆記“https://www.bilibili.com/video/BV1XW411x7NU?p=37”

widget.h檔案
#ifndef WIDGET_H
#define WIDGET_H


#include <QWidget>
#include <QPixmap>
#include <QPainter>
#include <QPen>


namespace Ui {
class Widget;
}


class Widget : public QWidget
{
    Q_OBJECT


public
 
:
    explicit Widget(QWidget *parent = 0);
    ~Widget();


private:
    Ui::Widget *ui;
protected:
    void paintEvent(QPaintEvent *event);
};


#endif // WIDGET_H

#include "widget.h"
#include "ui_widget.h"
#include <QColor>


Widget::Widget(QWidget *parent) :
    QWidget(parent)
 
,
    ui(new Ui::Widget)
{
    ui->setupUi(this);
}


Widget::~Widget()
{
    delete ui;
}
void Widget::paintEvent(QPaintEvent *event)
    QPainter p;
    p.begin(this);
    //背景圖操作
    //p.drawPixmap(0,0,width(),height(),QPixmap("../Image/1.bmp"));
    p.drawPixmap(rect(),QPixmap("../Image/1.bmp"
 
));
    //定義畫筆
    QPen pen;
    pen.setWidth(5);//設定線寬
    pen.setColor(QColor(0,0,255));//設定顏色
    pen.setStyle(Qt::DashLine);//設定風格
    //畫直線
    p.setPen(pen);
    p.drawLine(50,50,150,50);
    p.drawLine(50,50,50,150);
    p.drawLine(50,150,150,150);
    p.drawLine(150,50,150,150);
    QBrush brush;//定義畫刷
    brush.setColor(Qt::red);
    brush.setStyle(Qt::Dense1Pattern);//注意不設定樣式不填充
    p.setBrush(brush);
    //畫矩形
    p.drawRect(200,200,50,200);
    //畫圓
    p.drawEllipse(QPoint(160,160),50,50);
    p.end();


}