QT学习笔记之 IconEditor

这次写了一个简单的Icon编辑器，功能很简单的说.....详见代码



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iconeditor.h





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#ifndef ICONEDITOR_H

#define ICONEDITOR_H

#include <QtGui/QWidget>

#include <QImage>

#include <QWidget>

class IconEditor : public QWidget

{

Q_OBJECT

Q_PROPERTY(QColor penColor READ penClor WRITE setPenColor);

Q_PROPERTY(QImage iconImage READ iconImage WRITE setIconImage);

Q_PROPERTY(int zoomFactor READ zoomFactor WRITE setZoomFactor);

public:

IconEditor(QWidget *parent = 0);

~IconEditor();

void setPenColor(const QColor &newColor);

QColor penColor();

void setZoomFactor(int newZoom);

int zoomFactor() const;

void setIconImage(const QImage &newImage);

QImage iconImage() const;

QSize sizeHint() const;

protected:

void mousePressEvent(QMouseEvent *);

void mouseMoveEvent(QMouseEvent *);

void paintEvent(QPaintEvent *event);

private:

void setImagePixel(const QPoint &pos,bool opaque);

QRect pixelRect(int i,int j) const;

QColor curColor;

QImage image;

int zoom;

};

#endif // ICONEDITOR_H

/*

Q_PROPERTY用法：

Q_PROPERTY(type name

READ getFunction

[WRITE setFunction]

[RESET resetFunction]

[DESIGNABLE bool]

[SCRIPTABLE bool]

[STORED bool]

[USER bool])

*/





iconeditor.cpp





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#include<QtGui>

#include "iconeditor.h"

IconEditor::IconEditor(QWidget *parent)

: QWidget(parent)

{

setAttribute(Qt::WA_StaticContents);

setSizePolicy(QSizePolicy::Minimum,QSizePolicy::Minimum);

curColor=Qt::black;

zoom=8;

image=QImage(16,16,QImage::Format_ARGB32);

image.fill(qRgba(0,0,0,0));

}

/*

Qt::WA_StaticContents 用法：

Indicates that the widget contents are north-west aligned and static.

On resize, such a widget will receive paint events only for parts of itself

that are newly visible. This flag is set or cleared by the widget's author.

*/

IconEditor::~IconEditor()

{

}

void IconEditor::setPenColor(const QColor &newColor)

{

curColor=newColor;

}

QColor IconEditor::penColor()

{

return curColor;

}

void IconEditor::setZoomFactor(int newZoom)

{

if(newZoom<1)

newZoom=1;

if(newZoom!=zoom){

zoom=newZoom;

this->update();

this->updateGeometry(); //调用update和updateGeometry进行重绘

}

}

int IconEditor::zoomFactor() const

{

return zoom;

}

void IconEditor::setIconImage(const QImage &newImage)

{

if(newImage!=image){

image=newImage.convertToFormat(QImage::Format_ARGB32);

this->update();

this->updateGeometry();

}

}

QImage IconEditor::iconImage() const

{

return image;

}

QSize IconEditor::sizeHint() const

{

QSize size=zoom*image.size();

if(zoom>=3)

size+=QSize(1,1); //当zoom>=3时，增加一个像素用存放网格线

return size;

}

/*只要重绘就会调用这个函数*/

void IconEditor::paintEvent(QPaintEvent *event)

{

QPainter painter(this);

if(zoom>=3){

painter.setPen(palette().foreground().color());

//绘制垂直表格线

for(int i=0;i<=image.height();++i)

painter.drawLine(zoom*i,0,zoom*image.width(),zoom*i); //(x1,y1) to (x2,y2)

//绘制水平表格线

for(int j=0;j<image.width();++j)

painter.drawLine(0,zoom*j,zoom*image.width(),zoom*j);

}

for(int i=0;i<image.width();++i){

for(int j=0;j<image.height();++j){

QRect rect=pixelRect(i,j);

if(!event->region().intersect(rect).isEmpty()){ //region区域

QColor color=QColor::fromRgba(image.pixel(i,j)); //pixel(x,y)返回(x,y)的一个像素

if(color.alpha()<255)

painter.fillRect(rect,Qt::white);

painter.fillRect(rect,color);

}

}

}

}

QRect IconEditor::pixelRect(int i,int j) const

{

if(zoom>=3){

return QRect(zoom*i+1,zoom*j+1,zoom-1,zoom-1);

}else{

return QRect(zoom*i,zoom*j,zoom,zoom); //QRect其中一种构造函数，QRect ( int x, int y, int width, int height )

}

}

void IconEditor::mousePressEvent(QMouseEvent *event)

{

if(event->button()==Qt::LeftButton){

setImagePixel(event->pos(),true);

}else if(event->button()==Qt::RightButton){

setImagePixel(event->pos(),false);

}

}

void IconEditor::mouseMoveEvent(QMouseEvent *event)

{

if(event->buttons()& Qt::LeftButton){ //用Qt::LeftButton与buttons位或

setImagePixel(event->pos(),true);

}else if(event->buttons()& Qt::RightButton){

setImagePixel(event->pos(),false);

}

}

void IconEditor::setImagePixel(const QPoint &pos,bool opaque)

{

int i=pos.x()/zoom;

int j=pos.y()/zoom;

if(image.rect().contains(i,j)){

if(opaque){

image.setPixel(i,j,penColor().rgba());

}else{

image.setPixel(i,j,qRgba(0,0,0,0));

}

}

update(pixelRect(i,j));

}





main.cpp



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#include <QtGui/QApplication>

#include "iconeditor.h"

int main(int argc, char *argv[])

{

QApplication app(argc, argv);

IconEditor *iconEditor=new IconEditor;

iconEditor->setWindowTitle("Icon Editor");

iconEditor->setIconImage(QImage(":/images/qt-logo.png"));

iconEditor->show();

return app.exec();

}