- //EPmapImage.h
#ifndef EPMAPIMAGE_H
#define EPMAPIMAGE_H
#include <QObject>
#include <QRect>
#include <QImage>
class EPmapImage : public QObject
{
Q_OBJECT
public:
explicit EPmapImage(QObject *parent = 0);
void setRect(const QRect rect);
void setImage(QImage image);
void setImageSize();
void setImageAlpha();
const QRect &getRect();
QImage& getImage();
int getHandleCount(); //获得图片的控制点，总共8个
QCursor getHandleCursor(int nHandle); //根据不同的控制点设置鼠标的形状
QPoint getHandle(int nHandle); //获得每个控制点的坐标
void moveHandleTo(QPoint &newPos, int index); //把图片的控制点移动这个newPos位置
virtual void paint(QPainter &painter,QWidget *view = 0); //根据rect，image绘制图形。
private:
QImage image;
QRect rect;
};
#endif // EPMAPIMAGE_H
- //EPmapImage.cpp
#include "EPmapImage.h"
#include <QPainter>
#include <QCursor>
#include <QDebug>
EPmapImage::EPmapImage(QObject *parent) :
QObject(parent)
{
}
void EPmapImage::setRect(const QRect rect)
{
this->rect = rect;
}
const QRect& EPmapImage::getRect()
{
return rect;
}
void EPmapImage::setImage(QImage image)
{
this->image = image;
}
void EPmapImage::setImageSize()
{
image = image.scaled(rect.width(),rect.height());
setImageAlpha();
}
void EPmapImage::setImageAlpha()
{
QRgb rgb;
for(int i = 0;i<rect.width();i++)
for(int j = 0; j<rect.height(); j++)
{
QRgb rgb1 = image.pixel(i,j);
rgb = qRgba(qRed(rgb1),qGreen(rgb1),qBlue(rgb1),200);
image.setPixel(i,j,rgb);
}
}
QImage& EPmapImage::getImage()
{
return image;
}
int EPmapImage::getHandleCount()
{
return 8;
}
QCursor EPmapImage::getHandleCursor(int nHandle)
{
Qt::CursorShape id = Qt::ArrowCursor;
switch (nHandle)
{
case 0:
id = Qt::SizeAllCursor;
break;
case 1:
case 5:
id = Qt::SizeBDiagCursor;
break;
case 2:
case 6:
id = Qt::SizeVerCursor;
break;
case 3:
case 7:
id = Qt::SizeFDiagCursor;
break;
case 4:
case 8:
id = Qt::SizeHorCursor;
break;
}
return QCursor(id);
}
QPoint EPmapImage::getHandle(int nHandle)
{
int x = 0, y = 0, xCenter,yCenter;
xCenter = rect.center().x();
yCenter = rect.center().y();
switch (nHandle)
{
case 0:
x = xCenter;
y = yCenter;
break;
case 1:
x = rect.right();
y = rect.top();
break;
case 2:
x = xCenter;
y = rect.top();
break;
case 3:
x = rect.left();
y = rect.top();
break;
case 4:
x = rect.left();
y = yCenter;
break;
case 5:
x = rect.left();
y = rect.bottom();
break;
case 6:
x = xCenter;
y = rect.bottom();
break;
case 7:
x = rect.right();
y = rect.bottom();
break;
case 8:
x = rect.right();
y = yCenter;
break;
}
return QPoint(x,y);
}
void EPmapImage::moveHandleTo(QPoint &newPos, int index)
{
switch (index)
{
case 0:
rect.moveCenter(newPos);
break;
case 1:
rect.setTopRight(newPos);
break;
case 2:
rect.setTop(newPos.y());
break;
case 3:
rect.setTopLeft(newPos);
break;
case 4:
rect.setLeft(newPos.x());
break;
case 5:
rect.setBottomLeft(newPos);
break;
case 6:
rect.setBottom(newPos.y());
break;
case 7:
rect.setBottomRight(newPos);
break;
case 8:
rect.setRight(newPos.x());
break;
default:
break;
}
rect = rect.normalized();
}
void EPmapImage::paint(QPainter &painter, QWidget *view)
{
setImageSize();
painter.drawLine(rect.topLeft() + QPoint(-20,-20),rect.bottomRight() + QPoint(20,20));
painter.drawPixmap(rect.topLeft(),QPixmap::fromImage(image));
//painter.drawRect(rect);
}
- //EPmapView
#ifndef EPMAPVIEW_H
#define EPMAPVIEW_H
#include <QWidget>
#include <EPmapImage.h>
class EPmapView : public QWidget
{
Q_OBJECT
public:
explicit EPmapView(QWidget *parent = 0);
void setDrawImage(); //设置EPmapImage
void paintRect(QPainter &painter,const QRect &rect); //绘制控制点的，8个小正方形。
protected:
void paintEvent(QPaintEvent *);
void mousePressEvent(QMouseEvent *);
void mouseMoveEvent(QMouseEvent *); //实现移动图片的位置，修改图片的大小的功能。
// void mouseReleaseEvent(QMouseEvent *);
void mouseDoubleClickEvent(QMouseEvent *); //退出编辑图片
private:
bool m_isSelectedRect;
int m_cursorState;
EPmapImage *m_cImage;
};
#endif // EPMAPVIEW_H
- //EPmapView.cpp
#include "EPmapView.h"
#include <QPainter>
#include <QMouseEvent>
#include <QDebug>
EPmapView::EPmapView(QWidget *parent) :
QWidget(parent)
{
setDrawImage();
resize(400,400);
QImage& mage = m_cImage->getImage();
QPainter painter(&mage);
painter.initFrom(this);
painter.drawLine(200,100,100,200);
}
void EPmapView::paintEvent(QPaintEvent *)
{
QPainter painter(this);
m_cImage->paint(painter,this);
if(m_isSelectedRect)
{
QRect rect = m_cImage->getRect();
paintRect(painter,rect);
}
}
void EPmapView::mousePressEvent(QMouseEvent *e)
{
if (m_cImage->getRect().contains(e->pos()))
m_isSelectedRect = true;
repaint();
}
void EPmapView::mouseMoveEvent(QMouseEvent *e)
{
if(e->buttons() & Qt::LeftButton )
{
QPoint pos = e->pos();
m_cImage->moveHandleTo(pos,m_cursorState);
repaint();
}
else
for(int i = 0;i<=m_cImage->getHandleCount();i++)
{
QRect rect(m_cImage->getHandle(i)- QPoint(3,3),m_cImage->getHandle(i) + QPoint(3,3));
if(i == 0){
if(m_cImage->getRect().contains(e->pos()) && m_isSelectedRect){
setCursor(m_cImage->getHandleCursor(i));
m_cursorState = i;
}
else
setCursor(QCursor(Qt::ArrowCursor));
} else {
if(rect.contains(e->pos()) && m_isSelectedRect){
setCursor(m_cImage->getHandleCursor(i));
m_cursorState = i;
}
}
}
}
void EPmapView::mouseDoubleClickEvent(QMouseEvent *)
{
m_isSelectedRect = false;
m_cursorState = 100;
repaint();
}
void EPmapView::setDrawImage()
{
setMouseTracking(true);
m_cursorState = 100;
QRegion region;
setMask(region);
m_cImage = new EPmapImage;
QImage image(QSize(100,100),QImage::Format_ARGB32_Premultiplied);
QString str = ":/back.png";
image.load(str);
qDebug()<<image.format();
m_cImage->setImage(image.convertToFormat(QImage::Format_ARGB32_Premultiplied));
QRect rect(100,100,200,200);
m_cImage->setRect(rect);
m_cImage->setImageSize();
m_isSelectedRect = false;
}
void EPmapView::paintRect(QPainter &painter, const QRect &rect)
{
QPen pen;
pen.setColor(Qt::red);
pen.setWidth(2);
painter.setPen(pen);
painter.setRenderHints(QPainter::Antialiasing);
for(int i = 1;i<=m_cImage->getHandleCount();i++)
{
painter.drawRect(QRect(m_cImage->getHandle(i)-QPoint(3,3),m_cImage->getHandle(i)+QPoint(3,3)));
}
}
主要实现功能： 移动QImage，设置QImage透明现实，修改QImage的大小。 运行结果： 选中QImage  移动QImage  |
