field.cpp

一个多进程通信的演示

#include <QDateTime>
#include <QPaintEvent>
#include <QPainter>
#include <QTimer>
#include <stdio.h>

#include "field.h"
extern "C"{
	#include "connect.h"
};

extern "C"{
	void setPos( int x, int y );
};

Field::Field( QWidget* parent )
	:QWidget( parent ),
	bTransSignal( false )
{	
	timer = new QTimer(this);
	timeCount = 0;	
	connect(timer, SIGNAL(timeout()), this, SLOT(move()));
	xSpeed = 1;
	ySpeed = 1;
	posX = 200;
	posY = 200;
	radious = 25;
		
	timer->start(6);
	setPalette(QPalette(QColor(250, 250, 200)));
    	setAutoFillBackground(true);
}

void Field::checkIfTouch()
{
	if( posX + radious > 1200 ||  posX - radious < 0  )
		xSpeed = -xSpeed;
	else if( posY + radious > 400 || posY - radious < 0 )
		ySpeed = -ySpeed;
}

void Field::paintEvent( QPaintEvent* event )	
{
	QPainter painter(this);
    	painter.setPen(Qt::NoPen);
    	painter.setBrush(Qt::blue);
	painter.drawRoundRect( posX- radious, posY - radious, 2*radious, 2*radious );
} 

void Field::move()
{
	update( posX - radious, posY - radious, 2*radious, 2*radious );
	checkIfTouch()	;
	posX += xSpeed;
	posY += ySpeed;
	
	setPos( posX, posY );
}