这次直接贴出完整代码 求帮助啊，实在不知道哪儿错了 在线等
#include "paintarea.h"
#include <QMouseEvent>
#include<QPoint>
#include<QPainter>
#include<QPixmap>
#include<QPen>
#include<QBrush>
#include<QVector>
paintarea::paintarea(QWidget *parent) :
QWidget(parent)
{
pixmap=QPixmap(600,400);
backcolor=qRgb(255,255,255);
pixmap.fill(backcolor);
drawshape=none;
color=Qt::black;
width=1;
it=pixmaps.begin();
function=non;
}
void paintarea::paint(QPixmap& pixmap1)
{
int x,y,w,h;
x=beginpoint.x();
y=beginpoint.y();
w=endpoint.x()-beginpoint.x();
h=endpoint.y()-beginpoint.y();
QPainter pt(&pixmap1);
QPen pen;
QPen eraser1;
eraser1.setColor(Qt::white);
eraser1.setWidth(8);
pen.setWidth(width);
pen.setColor(color);
if(drawshape==eraser)
{
pt.setPen(eraser1);
}
else
pt.setPen(pen);
switch(drawshape)
{
case none:
{
pt.drawLine(beginpoint,endpoint);
beginpoint=endpoint;
break;
}
case line:
pt.drawLine(beginpoint,endpoint);
break;
case rectangle:
pt.drawRect(x,y,w,h);
break;
case ellipse:
pt.drawEllipse(x,y,w,h);
break;
case eraser:
{
pt.drawLine(beginpoint,endpoint);
beginpoint=endpoint;
break;
}
}
update();
}
void paintarea::paintEvent(QPaintEvent *)
{
QPainter pp(this);
pp.setRenderHint(QPainter::Antialiasing, true);
if(function==recind)
{
it--;
pixmap=(*it);
}
else if(function==recover)
{
it++;
pixmap=(*it);
}
if(drawshape==none||drawshape==eraser)
pp.drawPixmap(0,0,pixmap);
else
pp.drawPixmap(0,0,temppixmap);
}
void paintarea::mousePressEvent(QMouseEvent* event)
{
if(event->button() == Qt::LeftButton)
beginpoint=event->pos();
}
void paintarea::mouseMoveEvent(QMouseEvent*event)
{
if(event->buttons()&Qt::LeftButton)
{
endpoint = event->pos();
if(drawshape == none||drawshape== eraser)
{
paint(pixmap);
}
else
{
temppixmap = pixmap;
paint(temppixmap);
}
}
}
void paintarea::mouseReleaseEvent(QMouseEvent*event)
{
if(event->button()==Qt::LeftButton)
{
endpoint=event->pos();
pixmaps.push_back(pixmap);
}
paint(pixmap);
}
