c_cpp 莫尔

Posted 2021-05-14

#include "widget.h"
#include <QApplication>

int main(int argc, char *argv[]){
    QApplication a(argc, argv);
    Widget w;
    w.show();

    return a.exec();
}

#include "widget.h"
#include <QDebug>
#include <QPaintEvent>
#include <QPainter>

Widget::Widget(QWidget *parent) : QWidget(parent){}

Widget::~Widget(){}

void Widget::paintEvent(QPaintEvent *event){
    // qDebug() << "PaintEvent";
    QPainter painter(this);

    int w = width();
    int h = height();

    //painter.drawLine(w/2, 0, w/2, h);
    //painter.drawLine(0, h/2, w, h/2);

	//painter.drawArc(w / 2 - 60, h / 2 - 50, 100,100,0,360*16);
	//painter.drawArc(w / 2 - 120, h / 2 - 50, 100,100,0,360*16);
	//painter.drawArc(w / 2, h / 2 - 50, 100,100,0,360*16);
	//painter.drawArc(w / 2 + 60, h / 2 - 50, 100,100,0,360*16);

    int lines = 70;
    float xSpace = (float)w / lines;
    float ySpace = (float)h / lines;

    for(int i = 0; i <= lines; i++){
        painter.drawLine(0, 0,i * xSpace, h);
        painter.drawLine(0, 0, w, i * ySpace);

        painter.drawLine(w, h, 0, h - ySpace * i);
        painter.drawLine(w, h, i * xSpace, 0);
    }
}

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

class Widget : public QWidget {
	Q_OBJECT

    public:
        Widget(QWidget *parent = 0);
      	~Widget();
     	void paintEvent(QPaintEvent *event);
};

#endif // WIDGET_H