QT学习笔记之六 IconEditor

最新推荐文章于 2024-09-03 15:07:23 发布

核动力蜗牛Killua

最新推荐文章于 2024-09-03 15:07:23 发布

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分类专栏： ☆C/C++☆ ☆QT☆ 文章标签： qt image events object 网格 user

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本文介绍了一个使用Qt编写的简单图标编辑器，支持基本的绘制功能，如改变画笔颜色、缩放比例及图标图片等，并提供了完整的源代码实现。

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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

#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

#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

#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(); }

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PS:貌似无话可说