Qt实现背景画布上的图形绘制

#include "mainwindow.h" #include "ui_mainwindow.h" #include"donewdialog.h" #include <QColorDialog> #include <QMessageBox> #include <QFileDialog> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); ui->graphicsView->setFixedSize(2000,768); // resize(700,500); // area = new PaintArea; // scrollArea = new QScrollArea; //// scrollArea->setBackgroundRole(QPalette::Dark); //scrollArea对象的背景色设为Dark // scrollArea->setWidget(area); //将画布添加到scrollArea中 // scrollArea->widget()->setMinimumSize(800,600); // scrollArea->setMouseTracking(true); //// this->setMouseTracking(true); // setCentralWidget(scrollArea); // isSaved = false; // curFile = QStringLiteral("未命名.png"); QPalette palette = ui->textBrowser_Pen->palette(); //显示这个颜色 palette.setColor(QPalette::Base,QColor(Qt::black)); ui->textBrowser_Pen->setPalette(palette); // QPalette palette = ui->textBrowser_Brush->palette(); //显示这个颜色 palette.setColor(QPalette::Base,QColor(Qt::black)); ui->textBrowser_Brush->setPalette(palette); } void MainWindow::doOpen() { if (maybeSave()){ QString fileName = QFileDialog::getOpenFileName( this, QStringLiteral("打开文件"), QDir::currentPath()); if (!fileName.isEmpty()) { area->openImage(fileName); scrollArea->widget()->resize(area->getImageSize()); //获得图片的大小，然后更改scrollArea的大小 isSaved = true; curFile = fileName; } } } bool MainWindow::maybeSave() { if(area->isModified()) { QMessageBox::StandardButton box; box = QMessageBox::warning(this, QStringLiteral("保存文件"),QStringLiteral("图片已经改变，是否保存？"), QMessageBox::Yes|QMessageBox::No|QMessageBox::Cancel); if(box == QMessageBox::Yes) { return doFileSave(); } else if(box == QMessageBox::Cancel) { return false; } } return true; } bool MainWindow::doFileSave() { if(isSaved) { return saveFile(curFile); } else return doFileSaveAs(); } bool MainWindow::saveFile(QString fileName) { if(area->saveImage(fileName,"png")){ isSaved = true; return true; } else return false; } bool MainWindow::doFileSaveAs(){ QString fileName = QFileDialog::getSaveFileName( this,QStringLiteral("另存为"),curFile); if(fileName.isEmpty()){ return false; } else return saveFile(fileName); } void MainWindow::on_action_New_triggered() //新建菜单 { DoNewDialog dlg; if(dlg.exec() == QDialog::Accepted) { int width = dlg.getWidth(); int height = dlg.getHeight(); area->setImageSize(width,height); //更改画布大小 scrollArea->widget()->resize(width,height); //更改ScrollArea的大小 area->setImageColor(dlg.getBackColor()); } } void MainWindow::on_action_Save_triggered() { doFileSave(); } void MainWindow::on_action_SaveAs_triggered() { doFileSaveAs(); } void MainWindow::on_action_Open_triggered() { doOpen(); } void MainWindow::on_action_Exit_triggered() { if(maybeSave()) qApp->quit(); } void MainWindow::on_action_ZoomIn_triggered() { area->zoomIn(); } void MainWindow::on_action_ZoomOut_triggered() { area->zoomOut(); } void MainWindow::on_action_OverView_triggered() { area->overView(); } void MainWindow::on_action_Clear_triggered() { QImage image= QImage(600,500,QImage::Format_RGB32); // backColor = qRgb(255,255,255); image.fill(area->getBackColor()); area->setImage(image); area->repaint(); } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_penStyleComboBox_currentIndexChanged(const QString penStyle) { if(penStyle == QStringLiteral("实线")) { area->setPenStyle(Qt::SolidLine); //利用PaintArea类中的枚举变量 } else if(penStyle == QStringLiteral("虚线")) { area->setPenStyle(Qt::DotLine); } } void MainWindow::on_shapeComboBox_currentIndexChanged(const QString shape) { if(shape == QStringLiteral("点")) { area->setShape(PaintArea::Point); } else if(shape == QStringLiteral("线")) { area->setShape(PaintArea::Line); } else if(shape == QStringLiteral("面")) { area->setShape(PaintArea::Polygon); } } void MainWindow::on_penWidthSpinBox_valueChanged(int penWidth) { area->setPenWidth(penWidth); } void MainWindow::on_penColorToolButton_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 { area->setPenColor(newColor); QPalette palette = ui->textBrowser_Pen->palette(); //显示这个颜色 palette.setColor(QPalette::Base,newColor); ui->textBrowser_Pen->setPalette(palette); } } void MainWindow::on_brushColorToolButton_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 { area->setBrushColor(newColor); QPalette palette = ui->textBrowser_Brush->palette(); //显示这个颜色 palette.setColor(QPalette::Base,newColor); ui->textBrowser_Brush->setPalette(palette); } }