用QT绘图动态画个正方形
这只是我自己练习写的一个程序，其实做动画，QT有专用的qt quick application创建文件，用QML做出有很流畅效果的动画来。我因为是初学先练一下简单的线程绘图，里面有许多BUG只供大家参考widget.cpp
#include "widget.h"
#include "ui_widget.h"
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
time = new QTimer(this);
connect(ui->pushButton,&QPushButton::clicked,this,&Widget::startT);//启动计时器
initOne();//线程初始化
connect(this,&Widget::destroyed,this,&Widget::closeThread);//程序退出后关闭进程
}
Widget::~Widget()
{
delete ui;
}
void Widget::getImage(QImage image)
{
myImage = image;
update();
}
void Widget::paintEvent(QPaintEvent *)
{
QPainter p(this);
p.drawImage(50,50,myImage);
}
void Widget::closeThread()
{
thread->quit();
thread->wait();
delete myt;
}
void Widget::initOne()
{
myt = new MyThread;//给我新建的继承QObject的类分配空间
thread = new QThread(this);//创建一个线程对象
myt->moveToThread(thread);//把我的对象挂载到线程上
thread->start();//启动线程
/*通过每秒发送QTimer的timeout信号来调用我线程里画图函数*/
connect(time,&QTimer::timeout,myt,&MyThread::drawImage);
/*画图函数里发送的信号来给getImage槽函数传值*/
connect(myt,&MyThread::updataImage,this,&Widget::getImage);
}
void Widget::startT()
{
time->start(100);
}
void Widget::on_pushButton_2_clicked()//通过ui界面的转到槽功能来停止计时器
{
time->stop();
}
mythread.cpp
#include "mythread.h"
#include <Qt>
#include <QPainter>
#include <qmath.h>
MyThread::MyThread(QObject *parent) : QObject(parent)
{
x1=10,y1=10,x2=10,y2=10;
points=QPoint(10,10);
points=QPoint(10,90);
}
void MyThread::drawImage()
{
QImage image(100,100,QImage::Format_ARGB32);
QPen pen(Qt::SolidLine);
pen.setColor(Qt::red);
pen.setWidth(5);
p = new QPainter(&image);
p->setPen(pen);
drawLine();
emit updataImage(image);
delete p;
}
/*以下画方形的代码BUG很多
* 我只是瞎写的~
*/
void MyThread::drawLine()
{
if(y2<90&&x2==10)
{
p->drawLine(x1,y1,x2,y2);
y2++;
}else if(x2<90&&y2>10)
{
p->drawPolyline(points,2);
p->drawLine(10,90,x2,y2);
x2++;
}else if(y2>10&&x2==90)
{
points = QPoint(90,90);
p->drawPolyline(points,3);
p->drawLine(90,90,x2,y2);
y2--;
}else
{
points = QPoint(90,10);
p->drawPolyline(points,4);
p->drawLine(90,10,x2,y2);
x2--;
}
}
widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include "mythread.h"
#include <QThread>
#include <QEvent>
#include <QPainter>
#include <QTimer>
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
Q_OBJECT
public:
explicit Widget(QWidget *parent = 0);
~Widget();
private:
Ui::Widget *ui;
MyThread *myt;
QThread *thread;
QImage myImage;
QTimer *time;
void getImage(QImage image);
void getImage2(QImage image);
void closeThread();
void initOne();
void startT();
protected:
void paintEvent(QPaintEvent *);
private slots:
void on_pushButton_2_clicked();
};
#endif // WIDGET_H
mythread.h
#ifndef MYTHREAD_H
#define MYTHREAD_H
#include <QObject>
#include <QImage>
#include <QPen>
#include <QPainter>
#include <QMutex>
class MyThread : public QObject
{
Q_OBJECT
public:
explicit MyThread(QObject *parent = 0);
void drawImage();
signals:
void updataImage(QImage image);
private:
QPainter *p;
int x1,y1,x2,y2;
QPoint points[];
void drawLine();
public slots:
};
#endif // MYTHREAD_H
跟着楼主学qt
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