//maindow.h
#ifndef MAINWINDOW_H #define MAINWINDOW_H
#include"paintwidget.h" #include <QMainWindow> #include<QScrollArea>
#include<QComboBox> //颜色组合框头
namespace Ui { class MainWindow; }
class MainWindow : public QMainWindow { Q_OBJECT
public: explicit MainWindow(QWidget *parent = 0); ~MainWindow();
void doNew(); //新建文件操作 void doOpen(); //打开文件操作 bool doFileSave(); //保存文件操作 bool doFileSaveAs(); //文件另存为操作
void creatColorComboBox(QComboBox*comboBox); //构建颜色组合框
private: Ui::MainWindow *ui; PaintWidget*area; QScrollArea*scrollArea;
bool isSaved; //标志文件是否保存过 QString curFile; //保存当前文件的路径 bool maybeSave(); //是否保存文件
bool saveFile(QString fileName); //实现文件的存储
protected: void changeEvent(QEvent *e); void closeEvent(QCloseEvent*);
private slots: void on_action_triggered(); void on_brushColorComboBox_currentIndexChanged(int index); void on_penColorComboBox_currentIndexChanged(int index); void on_penWidthSpinBox_valueChanged(int ); void on_penStyleComboBox_currentIndexChanged(QString ); void on_shapeComboBox_currentIndexChanged(QString ); void on_action_28_triggered(); void on_action_26_triggered(); void on_action_24_triggered(); void on_action_23_triggered(); void on_action_22_triggered(); void on_action_21_triggered(); void on_action_20_triggered(); void on_action_P_triggered(); void on_action_X_triggered(); void on_action_A_triggered(); void on_action_S_triggered(); void on_action_O_triggered(); void on_action_N_triggered(); };
#endif // MAINWINDOW_H
//paintwidget.h
#ifndef PAINTWIDGET_H #define PAINTWIDGET_H
#include <QWidget> #include<QMouseEvent> #include<QPoint>
class PaintWidget : public QWidget { Q_OBJECT public: //explicit PaintWidget();
PaintWidget(); void setImageSize(int width,int height); //声明改变画布大小函数 void setImageColor(QColor color); //声明改变画布颜色函数
bool isModified() const{return modified;} //判断画布内容是否被更改过 bool saveImage(const QString&fileName,const char*fileFormat); //保存图片 bool openImage(const QString&fileName); //打开图片
QSize getImageSize();
void doPrint(); //打印菜单功能函数声明
//工具菜单功能函数声明 void zoomIn(); //放大 void zoomOut(); //缩小 void zoom_1(); //还原 void doRotate(); //旋转 void doShear(); //拉伸 void doClear(); //清空
//画笔颜色 void setPenStyle(Qt::PenStyle style); //设置画笔风格 void setPenWidth(int width); //设置画笔宽度 void setPenColor(QColor color); //设置画笔颜色 void setBrushColor(QColor color); //设置填充颜色
enum ShapeType //枚举变量，几个图形的选择 { None, Line, Rectangle, Ellipse, ERASE }; void setShape(ShapeType shape); //设置要绘制的图形
protected: void paintEvent(QPaintEvent*); //重绘事件
void mousePressEvent(QMouseEvent*); //鼠标按下事件 void mouseMoveEvent(QMouseEvent*); //鼠标移动事件 void mouseReleaseEvent(QMouseEvent*); //鼠标释放事件 void paint(QImage&theImage);
private: QImage image; //QImage类对象，用于在其上绘图 QRgb backColor; //QRgb颜色对象，存储image的背景色
QPoint lastPoint,endPoint; //定义两个坐标对象存放鼠标指针的前后两个坐标
bool modified; //标志画布是否被更改过
//工具变量声明 qreal scale; //缩放量 int angle; //角度 qreal shear; //拉伸量
//画笔填充变量 QColor penColor; //画笔颜色 QColor brushColor; //填充颜色 int penWidth; //画笔宽度 Qt::PenStyle penStyle; //画笔风格 ShapeType curShape; //当前图形
QImage tempImage; //临时绘图区 bool isDrawing; //是否在绘制特殊图形
signals:
public slots:
};
#endif // PAINTWIDGET_H
//donewdialog.h
#ifndef DONEWDIALOG_H #define DONEWDIALOG_H
#include <QDialog>
namespace Ui { class DoNewDialog; }
class DoNewDialog : public QDialog { Q_OBJECT
public: explicit DoNewDialog(QWidget *parent = 0); ~DoNewDialog(); int getWidth(); //用于返回画布的宽 int getHeight(); //用于返回画笔的高 QColor getBackColor(); //用于返回画布的背景色
protected: void changeEvent(QEvent *e);
private: Ui::DoNewDialog *ui; QColor backColor; //用于保存画布的背景色
private slots: void on_toolButton_clicked(); };
#endif // DONEWDIALOG_H
//mainwindow.cpp
#include <QtGui/QApplication> #include "mainwindow.h" #include <QTextCodec>
int main(int argc, char *argv[]) { QApplication a(argc, argv); QTextCodec::setCodecForTr(QTextCodec::codecForLocale()); MainWindow w; w.show();
return a.exec(); }
//paintwidget.cpp
#include "paintwidget.h" #include<QPainter>
#include<QPrintDialog> #include<QPrinter>
/*构造函数初始化对象*/ PaintWidget::PaintWidget()
{ image=QImage(400,300,QImage::Format_RGB32); //画布的初始化大小设为400*300，使用32位颜色 backColor=qRgb(255,255,255); //画布初始化背景色使用白色 image.fill(backColor);
modified=false; //modified=true;
scale=1; angle=0; shear=0;
penColor=Qt::black; brushColor=Qt::black; penWidth=1; penStyle=Qt::SolidLine; curShape=None;
isDrawing=false;
}
/*定义重绘函数*/ void PaintWidget::paintEvent(QPaintEvent*) { QPainter painter(this); //painter.drawImage(0,0,image);
//更改重绘事件函数 painter.scale(scale,scale); if(isDrawing) //如果正在绘制特殊图形，则显示临时绘图区上的内容 { painter.drawImage(0,0,tempImage); } else { if(angle) { QImage copyImage=image; //新建临时的copyImage，利用它进行旋转操作 QPainter pp(©Image); QPointF center(copyImage.width()/2.0,copyImage.height()/2.0); pp.translate(center); pp.rotate(angle); pp.translate(-center); pp.drawImage(0,0,image); image=copyImage; //只会复制图片上的内容，不会复制坐标系统 angle=0; //完成旋转后将角度值重新设为0
/*QPointF center(image.width()/2.0,image.height()/2.0); painter.translate(center); painter.rotate(angle); painter.translate(-center);*/
} if(shear) { //painter.shear(shear,shear); QImage copyImage=image; QPainter pp(©Image); pp.shear(shear,shear); pp.drawImage(0,0,image); image=copyImage; shear=0; } painter.drawImage(0,0,image);
}
}
QSize PaintWidget::getImageSize() { return image.size()*scale; }
/*定义鼠标按下、移动、释放函数*/ void PaintWidget::mousePressEvent(QMouseEvent*event) { if(event->button()==Qt::LeftButton) //当鼠标左键按下 { lastPoint=event->pos(); //获得鼠标指针当前坐标作为起始坐标 isDrawing=true; } }
void PaintWidget::mouseMoveEvent(QMouseEvent*event) { if(event->buttons()&Qt::LeftButton) //如果鼠标左键按着的同时移动鼠标 { endPoint=event->pos(); //获得鼠标指针当前坐标作为终止坐标
if(curShape==None || curShape==ERASE) //如果不进行特殊图形绘制，则直接在image上绘制 { isDrawing=false; paint(image); //绘制图形
} else //如果绘制特殊图形，则再临时绘图区tempImage上绘制 { tempImage=image; //每次绘制tempImage前用上一次image中的图片对其进行填充 paint(tempImage); } } }
void PaintWidget::mouseReleaseEvent(QMouseEvent*event) { if(event->button()==Qt::LeftButton) //如果鼠标左键释放 { endPoint=event->pos(); //获得鼠标指针当前坐标作为终止坐标 isDrawing=false; paint(image); //绘制图形
} }
void PaintWidget::paint(QImage&theImage) { QPainter pp(&theImage); //在theImage上绘图
/* pp.drawLine(lastPoint,endPoint); //由起始坐标和终止坐标绘制直线 update(); //进行更新界面显示，可引起窗口重绘事件，重绘窗口 */
// QPainter pp(&theImage); //在zheImage上绘图 QPen pen=QPen(); pen.setColor(penColor); pen.setStyle(penStyle); pen.setWidth(penWidth); QBrush brush=QBrush(brushColor); pp.setPen(pen); pp.setBrush(brush); QRect rect;
int x,y,w,h; x=lastPoint.x()/scale; y=lastPoint.y()/scale; w=(endPoint.x()-x)/scale; h=(endPoint.y()-y)/scale;
switch(curShape) { case None: //不绘制特殊图形 { pp.drawLine(lastPoint/scale,endPoint/scale); //由起始坐标和终止坐标绘制直线 lastPoint=endPoint; //让终止坐标变为起始坐标 break; } case Line: //绘制直线 { pp.drawLine(lastPoint/scale,endPoint/scale); break; } case Rectangle: //绘制矩形 { pp.drawRect(x,y,w,h); break; } case Ellipse: //绘制椭圆 { pp.drawEllipse(x,y,w,h); break; } case ERASE: //橡皮擦 { rect=QRect(lastPoint,QPoint(lastPoint.x()+10,lastPoint.y()+10)); //橡皮擦大小 pp.eraseRect(rect); lastPoint=endPoint; break; } } update(); //进行更新界面显示，可引起窗口重绘事件，重绘窗口 modified=true; }
void PaintWidget::setImageSize(int width,int height) { QImage newImage(width,height,QImage::Format_RGB32); image=newImage; update(); }
void PaintWidget::setImageColor(QColor color) { backColor=color.rgb(); //因为image的背景色要用QRgb类型的颜色，所以这里进行了转换 image.fill(backColor); update(); }
bool PaintWidget::saveImage(const QString&fileName,const char*fileFormat) { QImage visibleImage=image;
if(visibleImage.save(fileName,fileFormat)) //实现了文件存储 { modified=false; return true; } else { return false; } }
bool PaintWidget::openImage(const QString&fileName) { QImage loadedImage; if(!loadedImage.load(fileName)) return false;
QSize newSize=loadedImage.size(); setImageSize(newSize.width(),newSize.height()); image=loadedImage;
modified=false; update(); return true; }
void PaintWidget::doPrint() { QPrinter printer(QPrinter::HighResolution);
QPrintDialog*printDialog=new QPrintDialog(&printer,this); if(printDialog->exec()==QDialog::Accepted) { QPainter painter(&printer); QRect rect=painter.viewport(); QSize size=image.size(); size.scale(rect.size(),Qt::KeepAspectRatio); painter.setViewport(rect.x(),rect.y(),size.width(),size.height()); painter.setWindow(image.rect()); painter.drawImage(0,0,image);
} }
//编辑菜单功能函数定义
void PaintWidget::zoomIn() { scale*=1.2; update(); }
void PaintWidget::zoomOut() { scale/=1.2; update(); }
void PaintWidget::zoom_1() { scale=1; update(); }
void PaintWidget::doRotate() { angle+=90; update(); }
void PaintWidget::doShear() { shear=0.2; update(); }
void PaintWidget::doClear() { image.fill(backColor); //用现在的画布背景色进行填充 update(); }
//画笔填充函数定义 void PaintWidget::setPenStyle(Qt::PenStyle style) { penStyle=style; }
void PaintWidget::setPenWidth(int width) { penWidth=width; }
void PaintWidget::setPenColor(QColor color) { penColor=color; }
void PaintWidget::setBrushColor(QColor color) { brushColor=color; }
void PaintWidget::setShape(ShapeType shape) { curShape=shape; }
//donewdialog.cpp
#include "donewdialog.h" #include "ui_donewdialog.h"
#include<QColorDialog> #include<QDebug> DoNewDialog::DoNewDialog(QWidget *parent) : QDialog(parent), ui(new Ui::DoNewDialog) { ui->setupUi(this); //初始化 backColor=Qt::white; }
DoNewDialog::~DoNewDialog() { delete ui; }
//定义 void DoNewDialog::changeEvent(QEvent *e) { QDialog::changeEvent(e); switch(e->type()) { case QEvent::LanguageChange: ui->retranslateUi(this); break; default: break; } }
int DoNewDialog::getWidth() { return ui->widthSpinBox->text().toInt(); }
int DoNewDialog::getHeight() { return ui->heightSpinBox->text().toInt(); }
QColor DoNewDialog::getBackColor() { return backColor; }
void DoNewDialog::on_toolButton_clicked() { QColor newColor=QColorDialog::getColor(); //从颜色对话框获得颜色 if(newColor.isValid()) //如果得到的是可用的颜色 { backColor=newColor;
QPalette palette=ui->textBrowser->palette(); //显示这个颜色 palette.setColor(QPalette::Base,backColor); ui->textBrowser->setPalette(palette); update(); }
}
FROM:http://lizhigg.love.blog.163.com/blog/static/62611781201222105550184/
http://blog.csdn.net/imxiangzi/article/details/49310573
