基于QT的电子相册设计.docx

基于QT的电子相册设计一、设计内容及要求：1）能从存储卡中读取图像文件，并在LCD屏上显示图像文件，支持多种主流格式；2）显示时间、日期；3）通过按钮或触摸屏进行操作。二、设计目的1）了解Linux嵌入式2）了解QT的设计过程3）了解PC机和开发板之间的通信三、设计工具PC机、开发板四、设计过程1、功能模块结构架构图功能模块图片浏览模块图片播放模块系统设计模块2、具体功能模块架构图图片浏览模块图像正旋图像反旋图像放大图像缩小上一张图片下一张图片图像播放和系统设计模块选择加载图片图片播放4、基于QT的图像界面设计显示5、用户界面层代码设计#include mainwindow.h#include ui_mainwindow.hMainWindow:MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui:MainWindow) ui-setupUi(this); /init data image_sum = 0; image_index = 0; timer_second = 1000; /default 1s disp_angle = 0; disp_width = 281; disp_height = 211; disp_xratio = 1.0;disp_yratio = 1.0;/timer timer = new QTimer; /label label = new QLabel; ui-scrollArea-setWidget(label); ui-scrollArea-setAlignment(Qt:AlignCenter); /connect timout function connect(timer,SIGNAL(timeout(),this,SLOT(disp_timeout(); return;MainWindow:MainWindow() delete ui;6、用户图形界面的按钮功能实现代码void MainWindow:disp_timeout(void) image_show(); image_jump_to_next(); return;void MainWindow:image_jump_to_next() /check error if(0=image_sum) return; image_index+; if(image_index=image_sum) image_index = 0; return;void MainWindow:image_jump_to_prev() /check error if(0=image_sum) return; image_index-; if(image_index=image_sum |image_indeximage_height*disp_width) image_height *= (disp_width/(double)image_width); image_width *= (disp_width/(double)image_width); else image_width *= (disp_height/(double)image_height); image_height *= (disp_height/(double)image_height); image_width *= disp_xratio; image_height *= disp_yratio; pix = pix.scaled(image_width, image_height,Qt:KeepAspectRatio); /set image label-setPixmap(pix); return;void MainWindow:on_pushButton_add_clicked(void) long k=0; /file iterator QStringList:Iterator it; /file list QStringList list; /open dialog and add image files list = QFileDialog:getOpenFileNames(this, ,/,*.*); for(it=list.begin();itstart(timer_second); this-image_show(); return;void MainWindow:on_pushButton_stop_clicked() timer-stop(); return;void MainWindow:on_pushButton_play_clicked() timer-start();void MainWindow:on_pushButton_prev_clicked() /check error if(0 = image_sum) return; /stop display timer timer-stop();/jump to prev image image_jump_to_prev();/show image image_show(); return;void MainWindow:on_pushButton_next_clicked() /check error if(0 = image_sum) return; /stop display timer timer-stop(); /jump to next image image_jump_to_next();/show image image_show(); return;void MainWindow:on_pushButton_zoomin_clicked() disp_xratio += 0.05; disp_yratio += 0.05; image_show(); return;void MainWindow:on_pushButton_zoomout_clicked() if(disp_xratio0.05)disp_xratio -= 0.05; if(disp_yratio0.05)disp_yratio -= 0.05; image_show(); return;void MainWindow:on_pushButton_clockwise_clicked() disp_angle += 90; image_show(); return;void MainWindow:on_pushButton_anticlockwise_clicked() disp_angle -= 90; image_show(); return;7、功能模块实现代码：#include image.h#include ui_image.hint i=0;int j;/QString ima5=:/1.PNG,:/2.PNG,:/3.PNG,:/4.PNG,:/5.PNG;QString imagelist1000;QStringList:Iterator it;/迭代器的对象，类似指针但不是指针image:image(QWidget *parent) : QWidget(parent), ui(new Ui:image) ui-setupUi(this); /给窗体设置背景图片 QImage image1; image1.load(:/6.PNG); /括号内为图片的相对目录 QImage image2 = image1.scaled(320,240); QPalette palette;/定义窗口 palette.setBrush(this-backgroundRole(),QBrush(image2); this-setPalette(palette);/在定义的窗口显示 timer = new QTimer; label = new QLabel;/不报错但运行不出，头文件声明必须初始化 /matrix= new QMatrix; connect(timer,SIGNAL(timeout(),this,SLOT(imageshow(); ui-scrollArea-setWidget(label);/用scrollArea作为label的窗口 / ui-label-setAlignment(Qt:AlignCenter); ui-scrollArea-setAlignment(Qt:AlignCenter);void image:imageshow() pix.load(imagelisti); label-setPixmap(pix); i+; if(ij) i=0; image:image() delete ui;void image:on_pushButton_clicked() timer-start(1000); pix.load(imagelisti); label-setPixmap(pix); i+; if(ij) i=0; void image:on_Pause_clicked() timer-stop();void image:on_UP_clicked() timer-stop(); i+; if (i=j) i=0; pix.load(imagelisti); label-setPixmap(pix);void image:on_pushButton_2_clicked() timer-stop(); i-; if(i=0) i=j; pix.load(imagelisti); label-setPixmap(pix);void image:on_Open_clicked() int k = 0; QStringList list = QFileDialog:getOpenFileNames(this,选择图片,/,*.*); for(it=list.begin();itlist.end();it+) imagelistk=*it; qDebug()start(1000); pix.load(imagelisti); label-setPixmap(pix);void image:on_fangda_clicked() timer-stop(); double w=pix.width(); double h=pix.height(); pix = pix.scaled(w*1.05,h*1.05,Qt:KeepAspectRatio); label-setPixmap(pix);void image:on_suoxiao_clicked() timer-stop(); double w=pix.width(); double h=pix.height(); pix = pix.scaled(w*.95,h*.95,Qt:KeepAspectRatio); label-setPixmap(pix);void image:on_shun_clicked() timer-stop(); QMatrix matrix; matrix.rotate(90); pix = pix.transformed(matrix,Qt:FastTransformation); label-setPixmap(pix);void image:on_commandLinkButton_clicked() timer-stop(); QMatrix matrix; matrix.rotate(-90); pix = pix.transformed(matrix,Qt:FastTransformation); label-setPixmap(pix);五、效果显示六、分析和总结分析：这个设计的要求基本实现，但是仍然存在一些问题。第一个