C++程序开发基于Qt实现的简单绘画板程序源码+项目说明.zip

#include "mainwindow.h" #include <QStatusBar> #include <QActionGroup> #include <QMessageBox> #include <QColorDialog> #include <QDebug> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) { setStyleSheet("background-color: white;"); currentColor=Qt::black; setWindowTitle(tr("简单绘图程序 未命名")); centerWidget=new CenterWidget(this); setCentralWidget(centerWidget); fileMenu=menuBar()->addMenu(tr("文件")); newAction=new QAction(QIcon("D:\\gitcode\\SimpleDraw\\SimpleDraw_19_1\\res\\new.png"),tr("新建"),this); newAction->setShortcut(tr("Ctrl+N")); newAction->setStatusTip(tr("新建绘图文件")); openAction=new QAction(QIcon("D:\\gitcode\\SimpleDraw\\SimpleDraw_19_1\\res\\open.png"),tr("打开"),this); openAction->setShortcut(tr("Ctrl+O")); openAction->setStatusTip(tr("打开保存的绘图文件")); saveAction=new QAction(QIcon("D:\\gitcode\\SimpleDraw\\SimpleDraw_19_1\\res\\save.png"),tr("保存"),this); saveAction->setShortcut(tr("Ctrl+S")); saveAction->setStatusTip(tr("保存当前绘图文件")); exitAction=new QAction(tr("退出"),this); exitAction->setShortcut(tr("Ctrl+X")); exitAction->setStatusTip(tr("退出程序")); fileMenu->addAction(newAction); fileMenu->addAction(openAction); fileMenu->addAction(saveAction); fileMenu->addSeparator(); fileMenu->addAction(exitAction); lineAction=new QAction(QIcon("D:\\gitcode\\SimpleDraw\\SimpleDraw_19_1\\res\\line.png"),tr("线条"),this); lineAction->setShortcut(tr("Ctrl+L")); lineAction->setStatusTip(tr("绘制线条")); ellipseAction=new QAction(QIcon("D:\\gitcode\\SimpleDraw\\SimpleDraw_19_1\\res\\ellipse.png"),tr("椭圆"),this); ellipseAction->setShortcut(tr("Ctrl+E")); ellipseAction->setStatusTip(tr("绘制椭圆")); rectangleAction=new QAction(QIcon("D:\\gitcode\\SimpleDraw\\SimpleDraw_19_1\\res\\rectangle.png"),tr("矩形"),this); rectangleAction->setShortcut(tr("Ctrl+R")); rectangleAction->setStatusTip(tr("绘制矩形")); pointAction=new QAction(QIcon("D:\\gitcode\\SimpleDraw\\SimpleDraw_19_1\\res\\point.png"),tr("点"),this); pointAction->setShortcut(tr("Ctrl+P")); pointAction->setStatusTip(tr("绘制点")); undoAction=new QAction(QIcon("D:\\gitcode\\SimpleDraw\\SimpleDraw_19_1\\res\\undo.png"),tr("撤销"),this); undoAction->setShortcut(tr("Ctrl+Z")); undoAction->setStatusTip(tr("撤销")); redoAction=new QAction(QIcon("D:\\gitcode\\SimpleDraw\\SimpleDraw_19_1\\res\\redo.png"),tr("重做"),this); redoAction->setShortcut(tr("Ctrl+Y")); redoAction->setStatusTip(tr("重做")); drawMenu= menuBar()->addMenu(tr("绘图")); lineAction->setCheckable(true); ellipseAction->setCheckable(true); rectangleAction->setCheckable(true); pointAction->setCheckable(true); QActionGroup *group=new QActionGroup(this); group->addAction(lineAction); group->addAction(ellipseAction); group->addAction(rectangleAction); group->addAction(pointAction); drawMenu->addAction(lineAction); drawMenu->addAction(ellipseAction); drawMenu->addAction(rectangleAction); drawMenu->addAction(pointAction); drawMenu->addSeparator(); drawMenu->addAction(undoAction); drawMenu->addAction(redoAction); group->setExclusive (true); lineAction->setChecked(true); QMenu* colorMenu=new QMenu(tr("画笔颜色"),this); QAction* setColorAction=new QAction(tr("设置颜色"),this); colorMenu->addAction(setColorAction); menuBar()->addMenu(colorMenu); //颜色预览 QAction* ColorAction=new QAction(tr(""),this); colorToolBar=addToolBar(tr("color")); ColorAction->setStatusTip(tr("当前颜色")); colorToolBar->addAction(ColorAction); QPixmap pixmap(20,20); pixmap.fill(currentColor); colorToolBar->actions().first()->setIcon(QIcon(pixmap)); drawToolBar=addToolBar(tr("Draw")); drawToolBar->addAction(newAction); drawToolBar->addAction(openAction); drawToolBar->addAction(saveAction); drawToolBar->addSeparator(); drawToolBar->addAction(lineAction); drawToolBar->addAction(ellipseAction); drawToolBar->addAction(rectangleAction); drawToolBar->addAction(pointAction); //线宽设置 QSlider* lineWidthSlider=new QSlider(Qt::Horizontal); lineWidthSlider->setFixedWidth(300); lineWidthSlider->setRange(1,20); lineWidthSlider->setSingleStep(1); lineWidthSlider->setValue(3); lineWidthSlider->setToolTip(tr("线条宽度")); lineWidthSlider->setTracking(true); connect(lineWidthSlider,SIGNAL(valueChanged(int)),this,SLOT(setLineWidth(int))); QSpinBox *lineWidthBox=new QSpinBox(this); lineWidthBox->setRange(1,20); lineWidthBox->setSingleStep(1); lineWidthBox->setValue(3); lineWidthBox->setSingleStep(1); lineWidthSlider->setTracking(true); connect(lineWidthBox,SIGNAL(valueChanged(int)),this,SLOT(setLineWidth(int))); connect(lineWidthSlider,SIGNAL(valueChanged(int)),lineWidthBox,SLOT(setValue(int))); connect(lineWidthBox,SIGNAL(valueChanged(int)),lineWidthSlider,SLOT(setValue(int))); drawToolBar->addSeparator(); drawToolBar->addWidget(lineWidthBox); drawToolBar->addWidget(lineWidthSlider); connect(exitAction,SIGNAL(triggered()),this,SLOT(close())); connect(lineAction,SIGNAL(triggered()),this,SLOT(line())); connect(ellipseAction,SIGNAL(triggered()),this,SLOT(ellipse())); connect(rectangleAction,SIGNAL(triggered()),this,SLOT(rectangle())); connect(pointAction,SIGNAL(triggered()),this,SLOT(point())); connect(newAction,SIGNAL(triggered()),this,SLOT(newDrawing())); connect(openAction,SIGNAL(triggered()),this,SLOT(openDrawing())); connect(saveAction,SIGNAL(triggered()),this,SLOT(saveDrawing())); connect(setColorAction,SIGNAL(triggered()),this,SLOT(setColor())); connect(ColorAction,SIGNAL(triggered()),this,SLOT(setColor())); connect(undoAction,SIGNAL(triggered()),this,SLOT(undo())); connect(redoAction,SIGNAL(triggered()),this,SLOT(redo())); centerWidget->setDrawType(0); statusBar()->show(); } MainWindow::~MainWindow() { } void MainWindow::line() { centerWidget->setDrawType(0); } void MainWindow::ellipse() { centerWidget->setDrawType(1); } void MainWindow::rectangle() { centerWidget->setDrawType(2); } void MainWindow::point() { centerWidget->setDrawType(3); } void MainWindow::setColor(){ QColorDialog colorDialog(this); colorDialog.setCurrentColor(currentColor); if(colorDialog.exec()==QDialog::Accepted){ currentColor=colorDialog.selectedColor(); centerWidget->setCurrentColor(currentColor); } QPixmap pixmap(16,16); pixmap.fill(currentColor); colorToolBar->actions().first()->setIcon(QIcon(pixmap)); } void MainWindow::setLineWidth(int value){ centerWidget->setLineWidth(value); //lineWidthBox->setValue(value); //lineWidthSlider->setValue(value); } void MainWindow::newDrawing() { if(centerWidget->getModifiedFlag()==true) { //文档已修改 switch(QMessageBox::question(this,tr("文档保存提示"), tr("文档已经修改，是否保存文档"), QMessageBox::Ok| QMessageBox::Cancel|QMessageBox::No, QMessageBox::Ok)) { case QMessageBox::Ok: centerWidget->saveDrawing(); break; case QMessageBox::Cancel: return; case QMessageBox::No: break; default: break; } } centerWidget->newDrawing(); } void MainWindow::openDrawing() { if(