paint.cpp

一个简单的在LINUX QT下面画曲线图的程序

/****************************************************************************
** Form implementation generated from reading ui file 'paint_ui.ui'
**
** Created: Sun Jan 13 13:31:15 2008
**      by:  The User Interface Compiler (uic)
**
** WARNING! All changes made in this file will be lost!
****************************************************************************/
#include "paint_ui.h"
#include "paint.h"

#include <qpainter.h>
#include <qlabel.h>
#include <qpushbutton.h>
#include <qlayout.h>
#include <qvariant.h>
#include <qtooltip.h>
#include <qwhatsthis.h>
#include <qtextcodec.h>
/* 
 *  Constructs a paint_ui which is a child of 'parent', with the 
 *  name 'name' and widget flags set to 'f' 
 */
paint::paint( QWidget* parent,  const char* name, WFlags fl )
{
	QFont unifont=QFont("XINGKAI",50,500);
//	setFont(unifont);
	unifont.setPixelSize(40);
	QTextCodec* codec=QTextCodec::codecForName("GBK");
	
	pBtn_paint->setFont(unifont);
	pBtn_paint->setText(codec->toUnicode("画图"));

	connect(pBtn_paint,SIGNAL(clicked()),this,SLOT(paintEvent()));

}

/*  
 *  Destroys the object and frees any allocated resources
 */
paint::~paint()
{
    // no need to delete child widgets, Qt does it all for us
}

void paint::paintEvent()
{
	QPainter  paint(Label_paint);
	paint.setPen(QPen(black,2,SolidLine,RoundCap,RoundJoin));
	paint.translate(10.0,20.0);
	QPointArray points(10);
	points[0]=QPoint(20,40);
	points[1]=QPoint(25,45);
	points[2]=QPoint(35,50);
	points[3]=QPoint(40,50);
	points[4]=QPoint(50,60);
	points[5]=QPoint(60,65);
	points[6]=QPoint(70,78);
	points[7]=QPoint(80,56);
	points[8]=QPoint(90,52);
	points[9]=QPoint(100,68);
	paint.drawPolyline(points);
}