├── QTImageDisplay
    ├── qtimagedisplay.qrc
    ├── main.cpp
    ├── qclicklabel.hpp
    ├── qclicklabel.cpp
    ├── GeneratedFiles
    │   ├── qrc_qtimagedisplay.cpp
    │   └── ui_qtimagedisplay.h
    ├── qtimagedisplay.ui
    ├── qtimagedisplay.h
    ├── QTImageDisplay.vcxproj.filters
    ├── qtimagedisplay.cpp
    └── QTImageDisplay.vcxproj
├── QTImageDisplay.sln
├── .gitattributes
├── .gitignore
├── README.md
└── LICENSE


/QTImageDisplay/qtimagedisplay.qrc:
--------------------------------------------------------------------------------
1 | <RCC>
2 |     <qresource prefix="QTImageDisplay">
3 |     </qresource>
4 | </RCC>
5 | 


--------------------------------------------------------------------------------
/QTImageDisplay/main.cpp:
--------------------------------------------------------------------------------
 1 | #include "qtimagedisplay.h"
 2 | #include <QtWidgets/QApplication>
 3 | 
 4 | int main(int argc, char *argv[])
 5 | {
 6 | 	QApplication a(argc, argv);
 7 | 	QTImageDisplay w;
 8 | 	w.show();
 9 | 	return a.exec();
10 | }
11 | 


--------------------------------------------------------------------------------
/QTImageDisplay/qclicklabel.hpp:
--------------------------------------------------------------------------------
 1 | #pragma once
 2 | #include <QLabel>
 3 | #include <QWidget>
 4 | #include <QMouseEvent>
 5 | #include <QDebug>
 6 | 
 7 | class QClickLabel : public QLabel {
 8 | 	Q_OBJECT
 9 | signals :
10 | 	void MouseRelease(QMouseEvent *evt);
11 | 	void KeyPressed(QKeyEvent *evt);
12 | 	void MouseMoved(QMouseEvent* evt);
13 | 	void MousePressed(QMouseEvent* evt);
14 | 	void MouseDoubliClick(QMouseEvent* evt);
15 | 	void WheelEvent(QWheelEvent* evt);
16 | 
17 | public:
18 | 	QClickLabel(QWidget * parent = Q_NULLPTR): QLabel(parent)
19 | 	{}
20 | 	~QClickLabel();
21 | 
22 | protected:
23 | 	void mouseReleaseEvent(QMouseEvent*);  // listen to mouse event
24 | 	void mousePressEvent(QMouseEvent*);  // listen to mouse event
25 | 	void mouseMoveEvent(QMouseEvent*);  // listen to mouse event
26 | 	void keyPressEvent(QKeyEvent *);  // listen to key press event
27 | 	void mouseDoubleClickEvent(QMouseEvent *event);
28 | 	void wheelEvent(QWheelEvent *event);
29 | 	
30 | };
31 | 


--------------------------------------------------------------------------------
/QTImageDisplay/qclicklabel.cpp:
--------------------------------------------------------------------------------
 1 | #include "qclicklabel.hpp"
 2 | 
 3 | // destructor
 4 | QClickLabel::~QClickLabel() {
 5 | 	
 6 | }
 7 | 
 8 | 
 9 | void QClickLabel::mouseReleaseEvent(QMouseEvent *evt)
10 | {
11 | 	qDebug() << "in function ClickedLabel mouse release" << endl;
12 | 	emit MouseRelease(evt);
13 | }
14 | 
15 | 
16 | void QClickLabel::keyPressEvent(QKeyEvent *evt) {
17 | 	// listen to key press event
18 | 	qDebug() << "in function ClickedLabel key press" << endl;
19 | 	emit KeyPressed(evt);
20 | }
21 | 
22 | 
23 | void QClickLabel::mouseMoveEvent(QMouseEvent *event) {
24 | 	qDebug() << "in function mouseMoveEvent" << endl;
25 | 	emit MouseMoved(event);
26 | }
27 | 
28 | 
29 | void QClickLabel::mousePressEvent(QMouseEvent *event) {
30 | 	qDebug() << "in function mousePressEvent" << endl;
31 | 	emit MousePressed(event);
32 | }
33 | 
34 | 
35 | void QClickLabel::mouseDoubleClickEvent(QMouseEvent *event) {
36 | 	qDebug() << "in function mouseDoubleClickEvent" << endl;
37 | 	emit MouseDoubliClick(event);
38 | }
39 | 
40 | void QClickLabel::wheelEvent(QWheelEvent *event) {
41 | 	qDebug() << "in function wheelEvent" << endl;
42 | 	emit WheelEvent(event);
43 | }
44 | 
45 | 


--------------------------------------------------------------------------------
/QTImageDisplay.sln:
--------------------------------------------------------------------------------
 1 | 
 2 | Microsoft Visual Studio Solution File, Format Version 12.00
 3 | # Visual Studio 14
 4 | VisualStudioVersion = 14.0.25420.1
 5 | MinimumVisualStudioVersion = 10.0.40219.1
 6 | Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "QTImageDisplay", "QTImageDisplay\QTImageDisplay.vcxproj", "{B12702AD-ABFB-343A-A199-8E24837244A3}"
 7 | EndProject
 8 | Global
 9 | 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
10 | 		Debug|x64 = Debug|x64
11 | 		Debug|x86 = Debug|x86
12 | 		Release|x64 = Release|x64
13 | 		Release|x86 = Release|x86
14 | 	EndGlobalSection
15 | 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
16 | 		{B12702AD-ABFB-343A-A199-8E24837244A3}.Debug|x64.ActiveCfg = Debug|x64
17 | 		{B12702AD-ABFB-343A-A199-8E24837244A3}.Debug|x64.Build.0 = Debug|x64
18 | 		{B12702AD-ABFB-343A-A199-8E24837244A3}.Debug|x86.ActiveCfg = Debug|Win32
19 | 		{B12702AD-ABFB-343A-A199-8E24837244A3}.Debug|x86.Build.0 = Debug|Win32
20 | 		{B12702AD-ABFB-343A-A199-8E24837244A3}.Release|x64.ActiveCfg = Release|x64
21 | 		{B12702AD-ABFB-343A-A199-8E24837244A3}.Release|x64.Build.0 = Release|x64
22 | 		{B12702AD-ABFB-343A-A199-8E24837244A3}.Release|x86.ActiveCfg = Release|Win32
23 | 		{B12702AD-ABFB-343A-A199-8E24837244A3}.Release|x86.Build.0 = Release|Win32
24 | 	EndGlobalSection
25 | 	GlobalSection(SolutionProperties) = preSolution
26 | 		HideSolutionNode = FALSE
27 | 	EndGlobalSection
28 | EndGlobal
29 | 


--------------------------------------------------------------------------------
/QTImageDisplay/GeneratedFiles/qrc_qtimagedisplay.cpp:
--------------------------------------------------------------------------------
 1 | /****************************************************************************
 2 | ** Resource object code
 3 | **
 4 | ** Created by: The Resource Compiler for Qt version 5.6.2
 5 | **
 6 | ** WARNING! All changes made in this file will be lost!
 7 | *****************************************************************************/
 8 | 
 9 | #ifdef QT_NAMESPACE
10 | #  define QT_RCC_PREPEND_NAMESPACE(name) ::QT_NAMESPACE::name
11 | #  define QT_RCC_MANGLE_NAMESPACE0(x) x
12 | #  define QT_RCC_MANGLE_NAMESPACE1(a, b) a##_##b
13 | #  define QT_RCC_MANGLE_NAMESPACE2(a, b) QT_RCC_MANGLE_NAMESPACE1(a,b)
14 | #  define QT_RCC_MANGLE_NAMESPACE(name) QT_RCC_MANGLE_NAMESPACE2( \
15 |         QT_RCC_MANGLE_NAMESPACE0(name), QT_RCC_MANGLE_NAMESPACE0(QT_NAMESPACE))
16 | #else
17 | #   define QT_RCC_PREPEND_NAMESPACE(name) name
18 | #   define QT_RCC_MANGLE_NAMESPACE(name) name
19 | #endif
20 | 
21 | #ifdef QT_NAMESPACE
22 | namespace QT_NAMESPACE {
23 | #endif
24 | 
25 | #ifdef QT_NAMESPACE
26 | }
27 | #endif
28 | 
29 | int QT_RCC_MANGLE_NAMESPACE(qInitResources_qtimagedisplay)();
30 | int QT_RCC_MANGLE_NAMESPACE(qInitResources_qtimagedisplay)()
31 | {
32 |     return 1;
33 | }
34 | 
35 | int QT_RCC_MANGLE_NAMESPACE(qCleanupResources_qtimagedisplay)();
36 | int QT_RCC_MANGLE_NAMESPACE(qCleanupResources_qtimagedisplay)()
37 | {
38 |     return 1;
39 | }
40 | 
41 | namespace {
42 |    struct initializer {
43 |        initializer() { QT_RCC_MANGLE_NAMESPACE(qInitResources_qtimagedisplay)(); }
44 |        ~initializer() { QT_RCC_MANGLE_NAMESPACE(qCleanupResources_qtimagedisplay)(); }
45 |    } dummy;
46 | }
47 | 


--------------------------------------------------------------------------------
/QTImageDisplay/qtimagedisplay.ui:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <ui version="4.0">
 3 |  <class>QTImageDisplayClass</class>
 4 |  <widget class="QMainWindow" name="QTImageDisplayClass">
 5 |   <property name="geometry">
 6 |    <rect>
 7 |     <x>0</x>
 8 |     <y>0</y>
 9 |     <width>600</width>
10 |     <height>850</height>
11 |    </rect>
12 |   </property>
13 |   <property name="windowTitle">
14 |    <string>QTImageDisplay</string>
15 |   </property>
16 |   <widget class="QWidget" name="centralWidget">
17 |    <widget class="QLabel" name="label">
18 |     <property name="geometry">
19 |      <rect>
20 |       <x>0</x>
21 |       <y>0</y>
22 |       <width>601</width>
23 |       <height>791</height>
24 |      </rect>
25 |     </property>
26 |     <property name="text">
27 |      <string/>
28 |     </property>
29 |    </widget>
30 |   </widget>
31 |   <widget class="QMenuBar" name="menuBar">
32 |    <property name="geometry">
33 |     <rect>
34 |      <x>0</x>
35 |      <y>0</y>
36 |      <width>600</width>
37 |      <height>17</height>
38 |     </rect>
39 |    </property>
40 |    <widget class="QMenu" name="menuFile">
41 |     <property name="title">
42 |      <string>file</string>
43 |     </property>
44 |     <addaction name="actionOpen_iamge_file"/>
45 |     <addaction name="actionExit"/>
46 |    </widget>
47 |    <addaction name="menuFile"/>
48 |   </widget>
49 |   <widget class="QToolBar" name="mainToolBar">
50 |    <attribute name="toolBarArea">
51 |     <enum>TopToolBarArea</enum>
52 |    </attribute>
53 |    <attribute name="toolBarBreak">
54 |     <bool>false</bool>
55 |    </attribute>
56 |   </widget>
57 |   <widget class="QStatusBar" name="statusBar"/>
58 |   <action name="actionOpen_iamge_file">
59 |    <property name="text">
60 |     <string>open image file</string>
61 |    </property>
62 |   </action>
63 |   <action name="actionExit">
64 |    <property name="text">
65 |     <string>exit</string>
66 |    </property>
67 |   </action>
68 |  </widget>
69 |  <layoutdefault spacing="6" margin="11"/>
70 |  <resources>
71 |   <include location="qtimagedisplay.qrc"/>
72 |  </resources>
73 |  <connections/>
74 | </ui>
75 | 


--------------------------------------------------------------------------------
/QTImageDisplay/qtimagedisplay.h:
--------------------------------------------------------------------------------
 1 | #ifndef QTIMAGEDISPLAY_H
 2 | #define QTIMAGEDISPLAY_H
 3 | 
 4 | #include <QtWidgets/QMainWindow>
 5 | #include <QDebug>
 6 | #include <QFileDialog>
 7 | #include <QString>
 8 | #include <QDir>
 9 | #include <QMessageBox>
10 | #include <QImage>
11 | #include <vector>
12 | #include <QScrollBar>
13 | #include "ui_qtimagedisplay.h"
14 | #include "qclicklabel.hpp"
15 | 
16 | 
17 | class QTImageDisplay : public QMainWindow
18 | {
19 | 	Q_OBJECT
20 | 
21 | public:
22 | 	QTImageDisplay(QWidget *parent = 0);
23 | 	~QTImageDisplay();
24 | 
25 | 
26 | 	QClickLabel * qclicklabel;
27 | 	QAction *action_open_img_file;
28 | 	QAction *action_exit;
29 | 
30 | 
31 | 	// class variable
32 | 	int i_show_image_label_width;
33 | 	int i_show_image_label_height;
34 | 
35 | 	// image show start x, start y
36 | 	int i_show_image_start_x;
37 | 	int i_show_image_start_y;
38 | 
39 | 	// image zoom in ratio
40 | 	float f_iamge_ratio_x;
41 | 	float f_iamge_ratio_y;
42 | 
43 | 	// zoom parameter
44 | 	float f_zoom_step;
45 | 	float f_zoom_ratio_max;
46 | 	float f_zoom_ratio_min;
47 | 	float f_zoom_current_scale;
48 | 
49 | 
50 | 	// QImage front image pointer
51 | 	QImage* qimage_front_image;
52 | 	bool b_is_front_image_opened;
53 | 
54 | 	// bool variable
55 | 	bool is_translate_image;
56 | 	int i_mouse_last_position_x;
57 | 	int i_mouse_last_position_y;
58 | 	int i_mouse_new_position_x;
59 | 	int i_mouse_new_position_y;
60 | 	bool b_mouse_right_button_clicked;
61 | 	bool b_mouse_left_button_clicked;
62 | 	
63 | 	//**************************************
64 | 	//functions
65 | 	//**************************************
66 | 	void show_image();
67 | 	void translate_image();
68 | 
69 | 	// 10:51
70 | 
71 | 
72 | private:
73 | 	Ui::QTImageDisplayClass ui;
74 | 
75 | 
76 | private slots:
77 | 	// slots
78 | 	void slot_open_img_file();
79 | 	void slot_qclicklabel_wheel_move(QWheelEvent* evt);
80 | 	// used to select edge point and translate image
81 | 	void slot_qclicklabel_mouse_press(QMouseEvent* evt);
82 | 	void slot_qclicklabel_mouse_move(QMouseEvent* evt);
83 | 	void slot_qclicklabel_mouse_release(QMouseEvent* evt);
84 | };
85 | 
86 | #endif // QTIMAGEDISPLAY_H
87 | 


--------------------------------------------------------------------------------
/.gitattributes:
--------------------------------------------------------------------------------
 1 | ###############################################################################
 2 | # Set default behavior to automatically normalize line endings.
 3 | ###############################################################################
 4 | * text=auto
 5 | 
 6 | ###############################################################################
 7 | # Set default behavior for command prompt diff.
 8 | #
 9 | # This is need for earlier builds of msysgit that does not have it on by
10 | # default for csharp files.
11 | # Note: This is only used by command line
12 | ###############################################################################
13 | #*.cs     diff=csharp
14 | 
15 | ###############################################################################
16 | # Set the merge driver for project and solution files
17 | #
18 | # Merging from the command prompt will add diff markers to the files if there
19 | # are conflicts (Merging from VS is not affected by the settings below, in VS
20 | # the diff markers are never inserted). Diff markers may cause the following 
21 | # file extensions to fail to load in VS. An alternative would be to treat
22 | # these files as binary and thus will always conflict and require user
23 | # intervention with every merge. To do so, just uncomment the entries below
24 | ###############################################################################
25 | #*.sln       merge=binary
26 | #*.csproj    merge=binary
27 | #*.vbproj    merge=binary
28 | #*.vcxproj   merge=binary
29 | #*.vcproj    merge=binary
30 | #*.dbproj    merge=binary
31 | #*.fsproj    merge=binary
32 | #*.lsproj    merge=binary
33 | #*.wixproj   merge=binary
34 | #*.modelproj merge=binary
35 | #*.sqlproj   merge=binary
36 | #*.wwaproj   merge=binary
37 | 
38 | ###############################################################################
39 | # behavior for image files
40 | #
41 | # image files are treated as binary by default.
42 | ###############################################################################
43 | #*.jpg   binary
44 | #*.png   binary
45 | #*.gif   binary
46 | 
47 | ###############################################################################
48 | # diff behavior for common document formats
49 | # 
50 | # Convert binary document formats to text before diffing them. This feature
51 | # is only available from the command line. Turn it on by uncommenting the 
52 | # entries below.
53 | ###############################################################################
54 | #*.doc   diff=astextplain
55 | #*.DOC   diff=astextplain
56 | #*.docx  diff=astextplain
57 | #*.DOCX  diff=astextplain
58 | #*.dot   diff=astextplain
59 | #*.DOT   diff=astextplain
60 | #*.pdf   diff=astextplain
61 | #*.PDF   diff=astextplain
62 | #*.rtf   diff=astextplain
63 | #*.RTF   diff=astextplain
64 | 


--------------------------------------------------------------------------------
/QTImageDisplay/QTImageDisplay.vcxproj.filters:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 3 |   <ItemGroup>
 4 |     <Filter Include="Source Files">
 5 |       <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
 6 |       <Extensions>cpp;cxx;c;def</Extensions>
 7 |     </Filter>
 8 |     <Filter Include="Header Files">
 9 |       <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
10 |       <Extensions>h</Extensions>
11 |     </Filter>
12 |     <Filter Include="Form Files">
13 |       <UniqueIdentifier>{99349809-55BA-4b9d-BF79-8FDBB0286EB3}</UniqueIdentifier>
14 |       <Extensions>ui</Extensions>
15 |     </Filter>
16 |     <Filter Include="Resource Files">
17 |       <UniqueIdentifier>{D9D6E242-F8AF-46E4-B9FD-80ECBC20BA3E}</UniqueIdentifier>
18 |       <Extensions>qrc;*</Extensions>
19 |       <ParseFiles>false</ParseFiles>
20 |     </Filter>
21 |     <Filter Include="Generated Files">
22 |       <UniqueIdentifier>{71ED8ED8-ACB9-4CE9-BBE1-E00B30144E11}</UniqueIdentifier>
23 |       <Extensions>moc;h;cpp</Extensions>
24 |       <SourceControlFiles>False</SourceControlFiles>
25 |     </Filter>
26 |     <Filter Include="Generated Files\Debug">
27 |       <UniqueIdentifier>{56394526-b7d9-42c7-bd66-c5ab5c3f3649}</UniqueIdentifier>
28 |       <Extensions>cpp;moc</Extensions>
29 |       <SourceControlFiles>False</SourceControlFiles>
30 |     </Filter>
31 |     <Filter Include="Generated Files\Release">
32 |       <UniqueIdentifier>{539527b9-a4bf-4d7b-a821-03f7e66d6d3c}</UniqueIdentifier>
33 |       <Extensions>cpp;moc</Extensions>
34 |       <SourceControlFiles>False</SourceControlFiles>
35 |     </Filter>
36 |   </ItemGroup>
37 |   <ItemGroup>
38 |     <ClCompile Include="main.cpp">
39 |       <Filter>Source Files</Filter>
40 |     </ClCompile>
41 |     <ClCompile Include="qtimagedisplay.cpp">
42 |       <Filter>Source Files</Filter>
43 |     </ClCompile>
44 |     <ClCompile Include="GeneratedFiles\Debug\moc_qtimagedisplay.cpp">
45 |       <Filter>Generated Files\Debug</Filter>
46 |     </ClCompile>
47 |     <ClCompile Include="GeneratedFiles\Release\moc_qtimagedisplay.cpp">
48 |       <Filter>Generated Files\Release</Filter>
49 |     </ClCompile>
50 |     <ClCompile Include="GeneratedFiles\qrc_qtimagedisplay.cpp">
51 |       <Filter>Generated Files</Filter>
52 |     </ClCompile>
53 |     <ClCompile Include="qclicklabel.cpp">
54 |       <Filter>Header Files</Filter>
55 |     </ClCompile>
56 |     <ClCompile Include="GeneratedFiles\Debug\moc_qclicklabel.cpp">
57 |       <Filter>Generated Files\Debug</Filter>
58 |     </ClCompile>
59 |     <ClCompile Include="GeneratedFiles\Release\moc_qclicklabel.cpp">
60 |       <Filter>Generated Files\Release</Filter>
61 |     </ClCompile>
62 |   </ItemGroup>
63 |   <ItemGroup>
64 |     <CustomBuild Include="qtimagedisplay.h">
65 |       <Filter>Header Files</Filter>
66 |     </CustomBuild>
67 |     <CustomBuild Include="qtimagedisplay.ui">
68 |       <Filter>Form Files</Filter>
69 |     </CustomBuild>
70 |     <CustomBuild Include="qtimagedisplay.qrc">
71 |       <Filter>Resource Files</Filter>
72 |     </CustomBuild>
73 |     <CustomBuild Include="qclicklabel.hpp">
74 |       <Filter>Header Files</Filter>
75 |     </CustomBuild>
76 |   </ItemGroup>
77 |   <ItemGroup>
78 |     <ClInclude Include="GeneratedFiles\ui_qtimagedisplay.h">
79 |       <Filter>Generated Files</Filter>
80 |     </ClInclude>
81 |   </ItemGroup>
82 | </Project>


--------------------------------------------------------------------------------
/QTImageDisplay/GeneratedFiles/ui_qtimagedisplay.h:
--------------------------------------------------------------------------------
 1 | /********************************************************************************
 2 | ** Form generated from reading UI file 'qtimagedisplay.ui'
 3 | **
 4 | ** Created by: Qt User Interface Compiler version 5.6.2
 5 | **
 6 | ** WARNING! All changes made in this file will be lost when recompiling UI file!
 7 | ********************************************************************************/
 8 | 
 9 | #ifndef UI_QTIMAGEDISPLAY_H
10 | #define UI_QTIMAGEDISPLAY_H
11 | 
12 | #include <QtCore/QVariant>
13 | #include <QtWidgets/QAction>
14 | #include <QtWidgets/QApplication>
15 | #include <QtWidgets/QButtonGroup>
16 | #include <QtWidgets/QHeaderView>
17 | #include <QtWidgets/QLabel>
18 | #include <QtWidgets/QMainWindow>
19 | #include <QtWidgets/QMenu>
20 | #include <QtWidgets/QMenuBar>
21 | #include <QtWidgets/QStatusBar>
22 | #include <QtWidgets/QToolBar>
23 | #include <QtWidgets/QWidget>
24 | #include "qclicklabel.hpp"
25 | 
26 | QT_BEGIN_NAMESPACE
27 | 
28 | class Ui_QTImageDisplayClass
29 | {
30 | public:
31 |     QAction *actionOpen_iamge_file;
32 |     QAction *actionExit;
33 |     QWidget *centralWidget;
34 |     QClickLabel *label;
35 |     QMenuBar *menuBar;
36 |     QMenu *menuFile;
37 |     QToolBar *mainToolBar;
38 |     QStatusBar *statusBar;
39 | 
40 |     void setupUi(QMainWindow *QTImageDisplayClass)
41 |     {
42 |         if (QTImageDisplayClass->objectName().isEmpty())
43 |             QTImageDisplayClass->setObjectName(QStringLiteral("QTImageDisplayClass"));
44 |         QTImageDisplayClass->resize(600, 850);
45 |         actionOpen_iamge_file = new QAction(QTImageDisplayClass);
46 |         actionOpen_iamge_file->setObjectName(QStringLiteral("actionOpen_iamge_file"));
47 |         actionExit = new QAction(QTImageDisplayClass);
48 |         actionExit->setObjectName(QStringLiteral("actionExit"));
49 |         centralWidget = new QWidget(QTImageDisplayClass);
50 |         centralWidget->setObjectName(QStringLiteral("centralWidget"));
51 |         label = new QClickLabel(centralWidget);
52 |         label->setObjectName(QStringLiteral("label"));
53 |         label->setGeometry(QRect(0, 0, 601, 791));
54 |         QTImageDisplayClass->setCentralWidget(centralWidget);
55 |         menuBar = new QMenuBar(QTImageDisplayClass);
56 |         menuBar->setObjectName(QStringLiteral("menuBar"));
57 |         menuBar->setGeometry(QRect(0, 0, 600, 17));
58 |         menuFile = new QMenu(menuBar);
59 |         menuFile->setObjectName(QStringLiteral("menuFile"));
60 |         QTImageDisplayClass->setMenuBar(menuBar);
61 |         mainToolBar = new QToolBar(QTImageDisplayClass);
62 |         mainToolBar->setObjectName(QStringLiteral("mainToolBar"));
63 |         QTImageDisplayClass->addToolBar(Qt::TopToolBarArea, mainToolBar);
64 |         statusBar = new QStatusBar(QTImageDisplayClass);
65 |         statusBar->setObjectName(QStringLiteral("statusBar"));
66 |         QTImageDisplayClass->setStatusBar(statusBar);
67 | 
68 |         menuBar->addAction(menuFile->menuAction());
69 |         menuFile->addAction(actionOpen_iamge_file);
70 |         menuFile->addAction(actionExit);
71 | 
72 |         retranslateUi(QTImageDisplayClass);
73 | 
74 |         QMetaObject::connectSlotsByName(QTImageDisplayClass);
75 |     } // setupUi
76 | 
77 |     void retranslateUi(QMainWindow *QTImageDisplayClass)
78 |     {
79 |         QTImageDisplayClass->setWindowTitle(QApplication::translate("QTImageDisplayClass", "QTImageDisplay", 0));
80 |         actionOpen_iamge_file->setText(QApplication::translate("QTImageDisplayClass", "open image file", 0));
81 |         actionExit->setText(QApplication::translate("QTImageDisplayClass", "exit", 0));
82 |         label->setText(QString());
83 |         menuFile->setTitle(QApplication::translate("QTImageDisplayClass", "file", 0));
84 |     } // retranslateUi
85 | 
86 | };
87 | 
88 | namespace Ui {
89 |     class QTImageDisplayClass: public Ui_QTImageDisplayClass {};
90 | } // namespace Ui
91 | 
92 | QT_END_NAMESPACE
93 | 
94 | #endif // UI_QTIMAGEDISPLAY_H
95 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
  1 | ## Ignore Visual Studio temporary files, build results, and
  2 | ## files generated by popular Visual Studio add-ons.
  3 | 
  4 | # User-specific files
  5 | *.suo
  6 | *.user
  7 | *.userosscache
  8 | *.sln.docstates
  9 | 
 10 | # User-specific files (MonoDevelop/Xamarin Studio)
 11 | *.userprefs
 12 | 
 13 | # Build results
 14 | [Dd]ebug/
 15 | [Dd]ebugPublic/
 16 | [Rr]elease/
 17 | [Rr]eleases/
 18 | [Xx]64/
 19 | [Xx]86/
 20 | [Bb]uild/
 21 | bld/
 22 | [Bb]in/
 23 | [Oo]bj/
 24 | 
 25 | # Visual Studio 2015 cache/options directory
 26 | .vs/
 27 | # Uncomment if you have tasks that create the project's static files in wwwroot
 28 | #wwwroot/
 29 | 
 30 | # MSTest test Results
 31 | [Tt]est[Rr]esult*/
 32 | [Bb]uild[Ll]og.*
 33 | 
 34 | # NUNIT
 35 | *.VisualState.xml
 36 | TestResult.xml
 37 | 
 38 | # Build Results of an ATL Project
 39 | [Dd]ebugPS/
 40 | [Rr]eleasePS/
 41 | dlldata.c
 42 | 
 43 | # DNX
 44 | project.lock.json
 45 | artifacts/
 46 | 
 47 | *_i.c
 48 | *_p.c
 49 | *_i.h
 50 | *.ilk
 51 | *.meta
 52 | *.obj
 53 | *.pch
 54 | *.pdb
 55 | *.pgc
 56 | *.pgd
 57 | *.rsp
 58 | *.sbr
 59 | *.tlb
 60 | *.tli
 61 | *.tlh
 62 | *.tmp
 63 | *.tmp_proj
 64 | *.log
 65 | *.vspscc
 66 | *.vssscc
 67 | .builds
 68 | *.pidb
 69 | *.svclog
 70 | *.scc
 71 | 
 72 | # Chutzpah Test files
 73 | _Chutzpah*
 74 | 
 75 | # Visual C++ cache files
 76 | ipch/
 77 | *.aps
 78 | *.ncb
 79 | *.opendb
 80 | *.opensdf
 81 | *.sdf
 82 | *.cachefile
 83 | *.VC.db
 84 | 
 85 | # Visual Studio profiler
 86 | *.psess
 87 | *.vsp
 88 | *.vspx
 89 | *.sap
 90 | 
 91 | # TFS 2012 Local Workspace
 92 | $tf/
 93 | 
 94 | # Guidance Automation Toolkit
 95 | *.gpState
 96 | 
 97 | # ReSharper is a .NET coding add-in
 98 | _ReSharper*/
 99 | *.[Rr]e[Ss]harper
100 | *.DotSettings.user
101 | 
102 | # JustCode is a .NET coding add-in
103 | .JustCode
104 | 
105 | # TeamCity is a build add-in
106 | _TeamCity*
107 | 
108 | # DotCover is a Code Coverage Tool
109 | *.dotCover
110 | 
111 | # NCrunch
112 | _NCrunch_*
113 | .*crunch*.local.xml
114 | nCrunchTemp_*
115 | 
116 | # MightyMoose
117 | *.mm.*
118 | AutoTest.Net/
119 | 
120 | # Web workbench (sass)
121 | .sass-cache/
122 | 
123 | # Installshield output folder
124 | [Ee]xpress/
125 | 
126 | # DocProject is a documentation generator add-in
127 | DocProject/buildhelp/
128 | DocProject/Help/*.HxT
129 | DocProject/Help/*.HxC
130 | DocProject/Help/*.hhc
131 | DocProject/Help/*.hhk
132 | DocProject/Help/*.hhp
133 | DocProject/Help/Html2
134 | DocProject/Help/html
135 | 
136 | # Click-Once directory
137 | publish/
138 | 
139 | # Publish Web Output
140 | *.[Pp]ublish.xml
141 | *.azurePubxml
142 | 
143 | # TODO: Un-comment the next line if you do not want to checkin
144 | # your web deploy settings because they may include unencrypted
145 | # passwords
146 | #*.pubxml
147 | *.publishproj
148 | 
149 | # NuGet Packages
150 | *.nupkg
151 | # The packages folder can be ignored because of Package Restore
152 | **/packages/*
153 | # except build/, which is used as an MSBuild target.
154 | !**/packages/build/
155 | # Uncomment if necessary however generally it will be regenerated when needed
156 | #!**/packages/repositories.config
157 | # NuGet v3's project.json files produces more ignoreable files
158 | *.nuget.props
159 | *.nuget.targets
160 | 
161 | # Microsoft Azure Build Output
162 | csx/
163 | *.build.csdef
164 | 
165 | # Microsoft Azure Emulator
166 | ecf/
167 | rcf/
168 | 
169 | # Windows Store app package directory
170 | AppPackages/
171 | BundleArtifacts/
172 | 
173 | # Visual Studio cache files
174 | # files ending in .cache can be ignored
175 | *.[Cc]ache
176 | # but keep track of directories ending in .cache
177 | !*.[Cc]ache/
178 | 
179 | # Others
180 | ClientBin/
181 | [Ss]tyle[Cc]op.*
182 | ~$*
183 | *~
184 | *.dbmdl
185 | *.dbproj.schemaview
186 | *.pfx
187 | *.publishsettings
188 | node_modules/
189 | orleans.codegen.cs
190 | 
191 | # RIA/Silverlight projects
192 | Generated_Code/
193 | 
194 | # Backup & report files from converting an old project file
195 | # to a newer Visual Studio version. Backup files are not needed,
196 | # because we have git ;-)
197 | _UpgradeReport_Files/
198 | Backup*/
199 | UpgradeLog*.XML
200 | UpgradeLog*.htm
201 | 
202 | # SQL Server files
203 | *.mdf
204 | *.ldf
205 | 
206 | # Business Intelligence projects
207 | *.rdl.data
208 | *.bim.layout
209 | *.bim_*.settings
210 | 
211 | # Microsoft Fakes
212 | FakesAssemblies/
213 | 
214 | # GhostDoc plugin setting file
215 | *.GhostDoc.xml
216 | 
217 | # Node.js Tools for Visual Studio
218 | .ntvs_analysis.dat
219 | 
220 | # Visual Studio 6 build log
221 | *.plg
222 | 
223 | # Visual Studio 6 workspace options file
224 | *.opt
225 | 
226 | # Visual Studio LightSwitch build output
227 | **/*.HTMLClient/GeneratedArtifacts
228 | **/*.DesktopClient/GeneratedArtifacts
229 | **/*.DesktopClient/ModelManifest.xml
230 | **/*.Server/GeneratedArtifacts
231 | **/*.Server/ModelManifest.xml
232 | _Pvt_Extensions
233 | 
234 | # LightSwitch generated files
235 | GeneratedArtifacts/
236 | ModelManifest.xml
237 | 
238 | # Paket dependency manager
239 | .paket/paket.exe
240 | 
241 | # FAKE - F# Make
242 | .fake/
243 | 


--------------------------------------------------------------------------------
/QTImageDisplay/qtimagedisplay.cpp:
--------------------------------------------------------------------------------
  1 | #include "qtimagedisplay.h"
  2 | 
  3 | QTImageDisplay::QTImageDisplay(QWidget *parent)
  4 | 	: QMainWindow(parent)
  5 | {
  6 | 	// 1. set
  7 | 	ui.setupUi(this);
  8 | 	//set fix size
  9 | 	setFixedSize(600, 850);
 10 | 
 11 | 
 12 | 	// 2. get the widget pointer
 13 | 	qclicklabel = ui.label;
 14 | 	action_open_img_file = ui.actionOpen_iamge_file;
 15 | 	action_exit = ui.actionExit;
 16 | 
 17 | 	// 3. initiate the widget
 18 | 	qclicklabel->setAutoFillBackground(true); // enable us can change the background
 19 | 	QPalette label_palette = qclicklabel->palette();
 20 | 	label_palette.setColor(QPalette::Window, Qt::lightGray);   //change the background 
 21 | 	qclicklabel->setPalette(label_palette);
 22 | 	qclicklabel->setEnabled(true);
 23 | 
 24 | 	// get the width and height
 25 | 	i_show_image_label_width = qclicklabel->width();
 26 | 	i_show_image_label_height = qclicklabel->height();
 27 | 
 28 | 	// start x, start y
 29 | 	i_show_image_start_x = 0;
 30 | 	i_show_image_start_y = 0;
 31 | 
 32 | 	// image scale ratio
 33 | 	f_iamge_ratio_x = 1.0f;
 34 | 	f_iamge_ratio_y = 1.0f;
 35 | 
 36 | 	// zoom parameter
 37 | 	f_zoom_step = 0.5;
 38 | 	f_zoom_ratio_max = 4;
 39 | 	f_zoom_ratio_min = 1;
 40 | 	f_zoom_current_scale = 1.0;
 41 | 
 42 | 	// image translate
 43 | 	b_mouse_left_button_clicked = false;
 44 | 	b_mouse_right_button_clicked = false;
 45 | 
 46 | 	// 4. connect signals and slots 
 47 | 	connect(action_open_img_file, SIGNAL(triggered()), this, SLOT(slot_open_img_file()));
 48 | 	connect(action_exit, SIGNAL(triggered()), this, SLOT(close()));
 49 | 	connect(qclicklabel, SIGNAL(MouseMoved(QMouseEvent *)), this, SLOT(slot_qclicklabel_mouse_move(QMouseEvent *)));
 50 | 	connect(qclicklabel, SIGNAL(MousePressed(QMouseEvent *)), this, SLOT(slot_qclicklabel_mouse_press(QMouseEvent *)));
 51 | 	connect(qclicklabel, SIGNAL(MouseRelease(QMouseEvent *)), this, SLOT(slot_qclicklabel_mouse_release(QMouseEvent *)));
 52 | 	connect(qclicklabel, SIGNAL(WheelEvent(QWheelEvent *)), this, SLOT(slot_qclicklabel_wheel_move(QWheelEvent*)));
 53 | 
 54 | 
 55 | 
 56 | }
 57 | 
 58 | // wheel to zoom in and zoom out
 59 | void QTImageDisplay::slot_qclicklabel_wheel_move(QWheelEvent* evt) {
 60 | 
 61 | 	// get the delta
 62 | 	float f_degree_delta = evt->delta()*1.0 / 640;
 63 | 
 64 | 	// case1 : front image opened
 65 | 	if (b_is_front_image_opened) {
 66 | 
 67 | 		// zoom in and zoom out
 68 | 		// update scale ratio
 69 | 		if (f_zoom_current_scale + f_degree_delta > f_zoom_ratio_max || f_zoom_current_scale + f_degree_delta < f_zoom_ratio_min) {
 70 | 			return;
 71 | 		}
 72 | 		f_zoom_current_scale += f_degree_delta;
 73 | 		f_iamge_ratio_x = qimage_front_image->width()*1.0 / (f_zoom_current_scale*qclicklabel->width());
 74 | 		f_iamge_ratio_y = qimage_front_image->height()*1.0 / (f_zoom_current_scale*qclicklabel->height());
 75 | 
 76 | 		// show image
 77 | 		show_image();
 78 | 	}
 79 | }
 80 | 
 81 | 
 82 | // show front image
 83 | void QTImageDisplay::show_image() {
 84 | 
 85 | 	// test if qimage_front_image is not opened
 86 | 	if (qimage_front_image == NULL) {
 87 | 		return;
 88 | 	}
 89 | 
 90 | 	// show image 
 91 | 	QImage qimage_temp = qimage_front_image->copy();
 92 | 
 93 | 	// judge if the start_x or start_y is legal
 94 | 	if (i_show_image_start_x + qclicklabel->width() > qclicklabel->width()*f_zoom_current_scale) {
 95 | 		i_show_image_start_x = qclicklabel->width()*f_zoom_current_scale - qclicklabel->width() - 1;
 96 | 	}
 97 | 	if (i_show_image_start_y + qclicklabel->height() > qclicklabel->height()*f_zoom_current_scale) {
 98 | 		i_show_image_start_y = qclicklabel->height()*f_zoom_current_scale - qclicklabel->height() - 1;
 99 | 	}
100 | 
101 | 	QImage * qimage_scaled = new QImage;
102 | 	*qimage_scaled = qimage_temp.scaled(QSize(qclicklabel->width()*f_zoom_current_scale, qclicklabel->height()*f_zoom_current_scale), Qt::IgnoreAspectRatio).copy(i_show_image_start_x, i_show_image_start_y, qclicklabel->width(), qclicklabel->height());
103 | 	qclicklabel->setPixmap(QPixmap::fromImage(*qimage_scaled));
104 | 	delete qimage_scaled;
105 | 
106 | }
107 | 
108 | 
109 | // open front image
110 | void QTImageDisplay::slot_open_img_file() {
111 | 
112 | 	QString str_slected_image = QFileDialog::getOpenFileName(this,
113 | 		tr("select image file"),
114 | 		".//",
115 | 		tr("Image (*.png *.jpg *.xpm)"));
116 | 
117 | 	// front image pointer
118 | 	qimage_front_image = new QImage();
119 | 	if (!str_slected_image.isEmpty()) {
120 | 
121 | 		// validate the image is correctly opened
122 | 		if (!(qimage_front_image->load(str_slected_image))) {
123 | 
124 | 			QMessageBox::information(this,
125 | 				tr("info"),
126 | 				tr("open image fail!"));
127 | 			delete qimage_front_image;
128 | 			return;
129 | 		}
130 | 
131 | 
132 | 		// record the image scale ration x,y
133 | 		f_iamge_ratio_x = qimage_front_image->width()*1.0 / qclicklabel->width();
134 | 		f_iamge_ratio_y = qimage_front_image->height()*1.0 / qclicklabel->height();
135 | 
136 | 
137 | 		// get a image copy and show the image
138 | 		QImage qimage_temp = qimage_front_image->copy();
139 | 
140 | 		QImage * qimage_scaled = new QImage;
141 | 		*qimage_scaled = qimage_temp.scaled(QSize(qclicklabel->width(), qclicklabel->height()), Qt::IgnoreAspectRatio);
142 | 		qclicklabel->setPixmap(QPixmap::fromImage(*qimage_scaled));
143 | 		delete qimage_scaled;
144 | 
145 | 		// change status
146 | 		b_is_front_image_opened = true;
147 | 
148 | 		// reset parameters about show image
149 | 		f_zoom_current_scale = 1;
150 | 		// start x, start y
151 | 		i_show_image_start_x = 0;
152 | 		i_show_image_start_y = 0;
153 | 
154 | 
155 | 	}
156 | 	else {
157 | 		// log out information
158 | 		QMessageBox::information(this,
159 | 			tr("info"),
160 | 			tr("you select no file!"));
161 | 	}
162 | 
163 | }
164 | 
165 | 
166 | 
167 | // used to select edge point and translate image
168 | void QTImageDisplay::slot_qclicklabel_mouse_press(QMouseEvent* evt) {
169 | 
170 | 	// case1 : front image is opened
171 | 	if (b_is_front_image_opened) {
172 | 		// select edge point
173 | 		if (evt->button() == Qt::LeftButton) {
174 | 			
175 | 			b_mouse_left_button_clicked = true;
176 | 		}else if (evt->button() == Qt::RightButton) {
177 | 			// translate image
178 | 			b_mouse_right_button_clicked = true;
179 | 			i_mouse_last_position_x = evt->localPos().x();
180 | 			i_mouse_last_position_y = evt->localPos().y();
181 | 		}
182 | 	}
183 | }
184 | 
185 | void QTImageDisplay::slot_qclicklabel_mouse_move(QMouseEvent* evt) {
186 | 
187 | 	// case 1: front image is opened;
188 | 	if (b_is_front_image_opened) {
189 | 		if (b_mouse_right_button_clicked) {
190 | 			i_mouse_new_position_x = evt->localPos().x();
191 | 			i_mouse_new_position_y = evt->localPos().y();
192 | 			translate_image();
193 | 		}
194 | 	}
195 | }
196 | 
197 | // translate front image
198 | void QTImageDisplay::translate_image() {
199 | 	// 
200 | 	int i_distance = (i_mouse_new_position_x - i_mouse_last_position_x)*(i_mouse_new_position_x - i_mouse_last_position_x) + (i_mouse_new_position_y - i_mouse_last_position_y)*(i_mouse_new_position_y - i_mouse_last_position_y);
201 | 	if (i_distance < 50) {
202 | 		return;
203 | 	}
204 | 
205 | 	// compute the delta
206 | 	int i_delta_x = -1 * (i_mouse_new_position_x - i_mouse_last_position_x);
207 | 	int i_delta_y = -1 * (i_mouse_new_position_y - i_mouse_last_position_y);
208 | 
209 | 
210 | 	// start x exceeds the left edge
211 | 	if (i_show_image_start_x + i_delta_x < 0) {
212 | 		i_show_image_start_x = 0;
213 | 
214 | 	}
215 | 	else if (i_show_image_start_x + i_delta_x + qclicklabel->width() > int(f_zoom_current_scale*qclicklabel->width() - 1)) {
216 | 		//start x exceeds the right edge
217 | 		i_show_image_start_x = int(f_zoom_current_scale*qclicklabel->width() - qclicklabel->width());
218 | 	}
219 | 	else {
220 | 		i_show_image_start_x += i_delta_x;
221 | 	}
222 | 
223 | 	// start y exceeds the top edge
224 | 	if (i_show_image_start_y + i_delta_y < 0) {
225 | 		i_show_image_start_y = 0;
226 | 
227 | 	}
228 | 	else if (i_show_image_start_y + i_delta_y + qclicklabel->height() > int(f_zoom_current_scale*qclicklabel->height() - 1)) {
229 | 		//start y exceeds the bottom edge
230 | 		i_show_image_start_y = int(f_zoom_current_scale*qclicklabel->height() - qclicklabel->height());
231 | 	}
232 | 	else {
233 | 		i_show_image_start_y += i_delta_y;
234 | 	}
235 | 
236 | 	// update the mouse last position 
237 | 	i_mouse_last_position_x = i_mouse_new_position_x;
238 | 	i_mouse_last_position_y = i_mouse_new_position_y;
239 | 
240 | 	// show image 
241 | 	show_image();
242 | }
243 | 
244 | 
245 | //mouse wheel move event
246 | void QTImageDisplay::slot_qclicklabel_mouse_release(QMouseEvent* evt) {
247 | 
248 | 	//change the flag
249 | 	if (evt->button() == Qt::LeftButton) {
250 | 		b_mouse_left_button_clicked = false;
251 | 	}
252 | 	else if (evt->button() == Qt::RightButton) {
253 | 		b_mouse_right_button_clicked = false;
254 | 	}
255 | }
256 | 
257 | 
258 | 
259 | QTImageDisplay::~QTImageDisplay()
260 | {
261 | 
262 | 
263 | 
264 | }
265 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
  1 | ### [QT]- VS2015+QT5.6.2展示图片，支持放大、缩小、和移动图片
  2 | 
  3 | 本文主要介绍，如何使用在VS2015平台上集成QT环境实现一个控件（Widget），该控件可以展示图片，并且该支持滚动鼠标中间放大缩小图片，右键移动鼠标进行图片的拖动。本文将从以下几个部分进行描述：
  4 | 1. 将QT集成到VS2015平台
  5 | 2. 自定义控件描述
  6 | 3. 图片放大、缩小、移动的实现
  7 | 4. 工程效果
  8 | 5. 总结
  9 | ------
 10 | #### 一、 将QT集成到VS2015平台
 11 | <br>
 12 | 主要过程：安装QT、配置环境、和安装vs2015插件。在开源社区的一篇博客描述得很清楚，在这里不赘述了。[点此跳转到该博客](https://my.oschina.net/jthmath/blog/640227)
 13 | 
 14 | #### 二、 自定以控件描述
 15 | <br>
 16 | 在QT当中没有专门用来展示图片的控件，通常用于展示图片的控件是QLabel，但是该控件不支持图片的缩放移动等功能，所以就自定义一个控件，使其支持上述功能。
 17 | 先上代码：
 18 | 
 19 | **qclicklabel.hpp**：
 20 | ```c++
 21 | #pragma once
 22 | #include <QLabel>
 23 | #include <QWidget>
 24 | #include <QMouseEvent>
 25 | #include <QDebug>
 26 | 
 27 | class QClickLabel : public QLabel {
 28 | 	Q_OBJECT
 29 | signals :
 30 | 	void MouseRelease(QMouseEvent *evt);
 31 | 	void KeyPressed(QKeyEvent *evt);
 32 | 	void MouseMoved(QMouseEvent* evt);
 33 | 	void MousePressed(QMouseEvent* evt);
 34 | 	void MouseDoubliClick(QMouseEvent* evt);
 35 | 	void WheelEvent(QWheelEvent* evt);
 36 | 
 37 | public:
 38 | 	QClickLabel(QWidget * parent = Q_NULLPTR): QLabel(parent)
 39 | 	{}
 40 | 	~QClickLabel();
 41 | 
 42 | protected:
 43 | 	void mouseReleaseEvent(QMouseEvent*);  // listen to mouse event
 44 | 	void mousePressEvent(QMouseEvent*);  // listen to mouse event
 45 | 	void mouseMoveEvent(QMouseEvent*);  // listen to mouse event
 46 | 	void keyPressEvent(QKeyEvent *);  // listen to key press event
 47 | 	void mouseDoubleClickEvent(QMouseEvent *event);
 48 | 	void wheelEvent(QWheelEvent *event);
 49 | 	
 50 | };
 51 | ```
 52 | QClickLabel继承于QLabel，该控件能够支持鼠标的点击、移动、释放、双击、和中键滚动事件（代码protected部分定义）；同时该控件能够发射出相应的信号（代码signals处定义）
 53 | 
 54 | <br>
 55 | 
 56 | **qclicklabel.cpp**：
 57 | ```c++
 58 | #include "qclicklabel.hpp"
 59 | 
 60 | // destructor
 61 | QClickLabel::~QClickLabel() {
 62 | 	
 63 | }
 64 | 
 65 | 
 66 | void QClickLabel::mouseReleaseEvent(QMouseEvent *evt)
 67 | {
 68 | 	qDebug() << "in function ClickedLabel mouse release" << endl;
 69 | 	emit MouseRelease(evt);
 70 | }
 71 | 
 72 | 
 73 | void QClickLabel::keyPressEvent(QKeyEvent *evt) {
 74 | 	// listen to key press event
 75 | 	qDebug() << "in function ClickedLabel key press" << endl;
 76 | 	emit KeyPressed(evt);
 77 | }
 78 | 
 79 | 
 80 | void QClickLabel::mouseMoveEvent(QMouseEvent *event) {
 81 | 	qDebug() << "in function mouseMoveEvent" << endl;
 82 | 	emit MouseMoved(event);
 83 | }
 84 | 
 85 | 
 86 | void QClickLabel::mousePressEvent(QMouseEvent *event) {
 87 | 	qDebug() << "in function mousePressEvent" << endl;
 88 | 	emit MousePressed(event);
 89 | }
 90 | 
 91 | 
 92 | void QClickLabel::mouseDoubleClickEvent(QMouseEvent *event) {
 93 | 	qDebug() << "in function mouseDoubleClickEvent" << endl;
 94 | 	emit MouseDoubliClick(event);
 95 | }
 96 | 
 97 | void QClickLabel::wheelEvent(QWheelEvent *event) {
 98 | 	qDebug() << "in function wheelEvent" << endl;
 99 | 	emit WheelEvent(event);
100 | }
101 | ```
102 | 在**qclicklabel.cpp**实现部分，控件接收到任何鼠标事件，都发送相应的信号出去，以便在主程序当中做出相应的操作。
103 | 
104 | 
105 | #### 三、 图片放大、缩小、移动的实现
106 | <br>
107 | 
108 | 在自定以的控件当中，由于控件可以直接获取到鼠标事件，并且根据获取到的鼠标事件发出相应的信号，所以在主程序当中，我们只需要监听监听该控件，如果发出信号A，就做出相应的操作。
109 | 
110 | **图片放大和缩小：**
111 | 在此工程的实现中，加载到内存当中的图片都是以横纵铺满的方式展示在qlabel中，如下图所示
112 |  ![图 1  展示图片](http://upload-images.jianshu.io/upload_images/1769441-41ccea0d7eaae114.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
113 | 
114 | <br>
115 | 
116 | 此时展示的图片的宽高就和qlabel控件的宽高一致了，所以原图片的宽高`o_img_width,o_img_height`和qclicklabel的宽高 `show_width, show_height`会有一个比值 `ratio_o_2_show_width,ratio_o_2_show_height`。
117 | 此时，图片刚刚导入展示时图片的放大的倍数-scale为1（宽高扩大的倍数相同），鼠标的中键滚动，只需要改变这个scale在大于1的一个合理的范围，然后先将图片的宽高通过QImage里面的方法转换到`show_width*scale, show_height*scale`，然后将图片的`Rect(show_start_x, show_start_y, show_width, show_height)`-起点为`(show_start
118 | _x, show_start_y)`，宽高分别为`show_width, show_height`的长方形，此时的`show_start_x, show_start_y`都为0部分展示出来既可以实现图片的放大缩小了。
119 | 
120 | 响应鼠标滚动事件的槽
121 | ```c++
122 | // wheel to zoom in and zoom out
123 | void QTImageDisplay::slot_qclicklabel_wheel_move(QWheelEvent* evt) {
124 | 
125 | 	// get the delta
126 | 	float f_degree_delta = evt->delta()*1.0 / 640;
127 | 
128 | 	// case1 : front image opened
129 | 	if (b_is_front_image_opened) {
130 | 
131 | 		// zoom in and zoom out
132 | 		// update scale ratio
133 | 		if (f_zoom_current_scale + f_degree_delta > f_zoom_ratio_max || f_zoom_current_scale + f_degree_delta < f_zoom_ratio_min) {
134 | 			return;
135 | 		}
136 | 		f_zoom_current_scale += f_degree_delta;
137 | 		f_iamge_ratio_x = qimage_front_image->width()*1.0 / (f_zoom_current_scale*qclicklabel->width());
138 | 		f_iamge_ratio_y = qimage_front_image->height()*1.0 / (f_zoom_current_scale*qclicklabel->height());
139 | 
140 | 		// show image
141 | 		show_image();
142 | 	}
143 | }
144 | ```
145 | 
146 | show_image()函数实现
147 | ```c++
148 | // show front image
149 | void QTImageDisplay::show_image() {
150 | 
151 | 	// test if qimage_front_image is not opened
152 | 	if (qimage_front_image == NULL) {
153 | 		return;
154 | 	}
155 | 
156 | 	// show image 
157 | 	QImage qimage_temp = qimage_front_image->copy();
158 | 
159 | 	// judge if the start_x or start_y is legal
160 | 	if (i_show_image_start_x + qclicklabel->width() > qclicklabel->width()*f_zoom_current_scale) {
161 | 		i_show_image_start_x = qclicklabel->width()*f_zoom_current_scale - qclicklabel->width() - 1;
162 | 	}
163 | 	if (i_show_image_start_y + qclicklabel->height() > qclicklabel->height()*f_zoom_current_scale) {
164 | 		i_show_image_start_y = qclicklabel->height()*f_zoom_current_scale - qclicklabel->height() - 1;
165 | 	}
166 | 
167 | 	QImage * qimage_scaled = new QImage;
168 | 	*qimage_scaled = qimage_temp.scaled(QSize(qclicklabel->width()*f_zoom_current_scale, qclicklabel->height()*f_zoom_current_scale), Qt::IgnoreAspectRatio).copy(i_show_image_start_x, i_show_image_start_y, qclicklabel->width(), qclicklabel->height());
169 | 	qclicklabel->setPixmap(QPixmap::fromImage(*qimage_scaled));
170 | 	delete qimage_scaled;
171 | 
172 | }
173 | ```
174 | 
175 | <br>
176 | 
177 | **图片移动：**
178 | 在图片的移动过程中，需要使用到三个鼠标事件：鼠标单击事件、鼠标移动事件，鼠标释放事件。
179 | 在鼠标单击事件当中，我们需要记录此时点击的是鼠标的左键还是右键（用两个private variable保存该状态，代码如下所示）,并且当右键点击时，需要记录此时鼠标的位置，为了后面移动图片的需求；
180 | ```c++
181 | // used to select edge point and translate image
182 | void QTImageDisplay::slot_qclicklabel_mouse_press(QMouseEvent* evt) {
183 | 
184 | 	if (b_is_front_image_opened) {
185 | 		// select edge point
186 | 		if (evt->button() == Qt::LeftButton) {
187 | 			
188 | 			b_mouse_left_button_clicked = true;
189 | 		}else if (evt->button() == Qt::RightButton) {
190 | 			// translate image
191 | 			b_mouse_right_button_clicked = true;
192 | 			i_mouse_last_position_x = evt->localPos().x();
193 | 			i_mouse_last_position_y = evt->localPos().y();
194 | 		}
195 | 	}
196 | }
197 | ```
198 | 
199 | 在鼠标移动事件当中，由于我们设置的是右键单击然后移动鼠标进行图片的移动，所以在此，我们只需要处理右键被点击时的事件，此时记录鼠标移动后的所在的新的位置，然后交由translate_image()去移动图片，并且展示，该函数主要是通过鼠标的原始位置和鼠标最新位置的差值来更新`show_start_x，show_start_y`，并且判断此时的要展示的`Rect(show_start_x，show_start_y，show_width，show_height）`是否超出了边界；
200 | ```c++
201 | void QTImageDisplay::slot_qclicklabel_mouse_move(QMouseEvent* evt) {
202 | 
203 | 	// case 1: front image is opened;
204 | 	if (b_is_front_image_opened) {
205 | 		if (b_mouse_right_button_clicked) {
206 | 			i_mouse_new_position_x = evt->localPos().x();
207 | 			i_mouse_new_position_y = evt->localPos().y();
208 | 			translate_image();
209 | 		}
210 | 	}
211 | }
212 | 
213 | // translate front image
214 | void QTImageDisplay::translate_image() {
215 | 	// 
216 | 	int i_distance = (i_mouse_new_position_x - i_mouse_last_position_x)*(i_mouse_new_position_x - i_mouse_last_position_x) + (i_mouse_new_position_y - i_mouse_last_position_y)*(i_mouse_new_position_y - i_mouse_last_position_y);
217 | 	if (i_distance < 50) {
218 | 		return;
219 | 	}
220 | 
221 | 	// compute the delta
222 | 	int i_delta_x = -1 * (i_mouse_new_position_x - i_mouse_last_position_x);
223 | 	int i_delta_y = -1 * (i_mouse_new_position_y - i_mouse_last_position_y);
224 | 
225 | 
226 | 	// start x exceeds the left edge
227 | 	if (i_show_image_start_x + i_delta_x < 0) {
228 | 		i_show_image_start_x = 0;
229 | 
230 | 	}
231 | 	else if (i_show_image_start_x + i_delta_x + qclicklabel->width() > int(f_zoom_current_scale*qclicklabel->width() - 1)) {
232 | 		//start x exceeds the right edge
233 | 		i_show_image_start_x = int(f_zoom_current_scale*qclicklabel->width() - qclicklabel->width());
234 | 	}
235 | 	else {
236 | 		i_show_image_start_x += i_delta_x;
237 | 	}
238 | 
239 | 	// start y exceeds the top edge
240 | 	if (i_show_image_start_y + i_delta_y < 0) {
241 | 		i_show_image_start_y = 0;
242 | 
243 | 	}
244 | 	else if (i_show_image_start_y + i_delta_y + qclicklabel->height() > int(f_zoom_current_scale*qclicklabel->height() - 1)) {
245 | 		//start y exceeds the bottom edge
246 | 		i_show_image_start_y = int(f_zoom_current_scale*qclicklabel->height() - qclicklabel->height());
247 | 	}
248 | 	else {
249 | 		i_show_image_start_y += i_delta_y;
250 | 	}
251 | 
252 | 	// update the mouse last position 
253 | 	i_mouse_last_position_x = i_mouse_new_position_x;
254 | 	i_mouse_last_position_y = i_mouse_new_position_y;
255 | 
256 | 	// show image 
257 | 	show_image();
258 | }
259 | ```
260 | 在鼠标释放事件当中，需要恢复记录鼠标的点击状态的两个private variable，代码如下所示：
261 | 
262 | ```c++
263 | //mouse wheel move event
264 | void QTImageDisplay::slot_qclicklabel_mouse_release(QMouseEvent* evt) {
265 | 
266 | 	//change the flag
267 | 	if (evt->button() == Qt::LeftButton) {
268 | 		b_mouse_left_button_clicked = false;
269 | 	}
270 | 	else if (evt->button() == Qt::RightButton) {
271 | 		b_mouse_right_button_clicked = false;
272 | 	}
273 | }
274 | ```
275 | 
276 | 至此，图片的移动也就实现了。
277 | 
278 | 
279 | #### 四、 工程效果
280 | <br>
281 | 
282 | 
283 | ![图 2    效果图](http://upload-images.jianshu.io/upload_images/1769441-598a07ac8097bfa0.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
284 | 
285 | #### 五、 总结
286 |   本文只是展示了作者在实现展示图片控件的一个思路，但是还不够完美，比如可以多设置几种展示的方式，比如居中，适应宽度，适应高度，宽高独立放大缩小等等。不过如果你对于本文描述的实现方式能够理解，那么上述的一些功能只需要根据自己工程的需求去私人定制就好了。
287 | 
288 | 


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