├── MyImageViewer
    ├── MyImageViewer.rc
    ├── lena.bmp
    ├── MyImageViewer.qrc
    ├── MyImageViewer.ico
    ├── main.cpp
    ├── MyImageViewer.cpp
    ├── MyImageViewer.h
    ├── MyImageViewer.ui
    ├── GeneratedFiles
    │   ├── qrc_MyImageViewer.cpp
    │   └── ui_MyImageViewer.h
    ├── QImageViewer.h
    ├── MyImageViewer.vcxproj.filters
    ├── MyImageViewer.vcxproj
    └── QImageViewer.cpp
├── MyImageViewer.sln
├── .gitattributes
└── .gitignore


/MyImageViewer/MyImageViewer.rc:
--------------------------------------------------------------------------------
1 | IDI_ICON1		ICON		DISCARDABLE	"MyImageViewer.ico"
2 | 
3 | 


--------------------------------------------------------------------------------
/MyImageViewer/lena.bmp:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/liuchang0523/MyImageViewer/HEAD/MyImageViewer/lena.bmp


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


--------------------------------------------------------------------------------
/MyImageViewer/MyImageViewer.ico:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/liuchang0523/MyImageViewer/HEAD/MyImageViewer/MyImageViewer.ico


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


--------------------------------------------------------------------------------
/MyImageViewer/MyImageViewer.cpp:
--------------------------------------------------------------------------------
 1 | #include "MyImageViewer.h"
 2 | 
 3 | MyImageViewer::MyImageViewer(QWidget *parent)
 4 |     : QWidget(parent)
 5 | {
 6 |     ui.setupUi(this);
 7 |     ui.widget->setImage(QImage("lena.bmp"));
 8 | }
 9 | 
10 | void MyImageViewer::on_widget_Coordinate(QString str)
11 | {
12 |     ui.label->setText(str);
13 | }
14 | 


--------------------------------------------------------------------------------
/MyImageViewer/MyImageViewer.h:
--------------------------------------------------------------------------------
 1 | #pragma once
 2 | 
 3 | #include <QtWidgets/QWidget>
 4 | #include "ui_MyImageViewer.h"
 5 | 
 6 | class MyImageViewer : public QWidget
 7 | {
 8 |     Q_OBJECT
 9 | 
10 | public:
11 |     MyImageViewer(QWidget *parent = Q_NULLPTR);
12 | 
13 | private slots:
14 |     void on_widget_Coordinate(QString str);
15 | 
16 | private:
17 |     Ui::MyImageViewerClass ui;
18 | };
19 | 


--------------------------------------------------------------------------------
/MyImageViewer.sln:
--------------------------------------------------------------------------------
 1 | 
 2 | Microsoft Visual Studio Solution File, Format Version 12.00
 3 | # Visual Studio 15
 4 | VisualStudioVersion = 15.0.28307.168
 5 | MinimumVisualStudioVersion = 10.0.40219.1
 6 | Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "MyImageViewer", "MyImageViewer\MyImageViewer.vcxproj", "{B12702AD-ABFB-343A-A199-8E24837244A3}"
 7 | EndProject
 8 | Global
 9 | 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
10 | 		Debug|x64 = Debug|x64
11 | 		Release|x64 = Release|x64
12 | 	EndGlobalSection
13 | 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
14 | 		{B12702AD-ABFB-343A-A199-8E24837244A3}.Debug|x64.ActiveCfg = Debug|x64
15 | 		{B12702AD-ABFB-343A-A199-8E24837244A3}.Debug|x64.Build.0 = Debug|x64
16 | 		{B12702AD-ABFB-343A-A199-8E24837244A3}.Release|x64.ActiveCfg = Release|x64
17 | 		{B12702AD-ABFB-343A-A199-8E24837244A3}.Release|x64.Build.0 = Release|x64
18 | 	EndGlobalSection
19 | 	GlobalSection(SolutionProperties) = preSolution
20 | 		HideSolutionNode = FALSE
21 | 	EndGlobalSection
22 | 	GlobalSection(ExtensibilityGlobals) = postSolution
23 | 		SolutionGuid = {0CA2FCAC-331E-48D0-8C54-A2077C2509F1}
24 | 	EndGlobalSection
25 | EndGlobal
26 | 


--------------------------------------------------------------------------------
/MyImageViewer/MyImageViewer.ui:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <ui version="4.0">
 3 |  <class>MyImageViewerClass</class>
 4 |  <widget class="QWidget" name="MyImageViewerClass">
 5 |   <property name="geometry">
 6 |    <rect>
 7 |     <x>0</x>
 8 |     <y>0</y>
 9 |     <width>929</width>
10 |     <height>668</height>
11 |    </rect>
12 |   </property>
13 |   <property name="windowTitle">
14 |    <string>MyImageViewer</string>
15 |   </property>
16 |   <layout class="QGridLayout" name="gridLayout" rowstretch="0,1">
17 |    <item row="1" column="0">
18 |     <widget class="QImageViewer" name="widget" native="true"/>
19 |    </item>
20 |    <item row="0" column="0">
21 |     <widget class="QLabel" name="label">
22 |      <property name="text">
23 |       <string/>
24 |      </property>
25 |     </widget>
26 |    </item>
27 |   </layout>
28 |  </widget>
29 |  <layoutdefault spacing="6" margin="11"/>
30 |  <customwidgets>
31 |   <customwidget>
32 |    <class>QImageViewer</class>
33 |    <extends>QWidget</extends>
34 |    <header>qimageviewer.h</header>
35 |    <container>1</container>
36 |   </customwidget>
37 |  </customwidgets>
38 |  <resources>
39 |   <include location="MyImageViewer.qrc"/>
40 |  </resources>
41 |  <connections/>
42 | </ui>
43 | 


--------------------------------------------------------------------------------
/MyImageViewer/GeneratedFiles/qrc_MyImageViewer.cpp:
--------------------------------------------------------------------------------
 1 | /****************************************************************************
 2 | ** Resource object code
 3 | **
 4 | ** Created by: The Resource Compiler for Qt version 5.11.1
 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_MyImageViewer)();
30 | int QT_RCC_MANGLE_NAMESPACE(qInitResources_MyImageViewer)()
31 | {
32 |     return 1;
33 | }
34 | 
35 | int QT_RCC_MANGLE_NAMESPACE(qCleanupResources_MyImageViewer)();
36 | int QT_RCC_MANGLE_NAMESPACE(qCleanupResources_MyImageViewer)()
37 | {
38 |     return 1;
39 | }
40 | 
41 | namespace {
42 |    struct initializer {
43 |        initializer() { QT_RCC_MANGLE_NAMESPACE(qInitResources_MyImageViewer)(); }
44 |        ~initializer() { QT_RCC_MANGLE_NAMESPACE(qCleanupResources_MyImageViewer)(); }
45 |    } dummy;
46 | }
47 | 


--------------------------------------------------------------------------------
/MyImageViewer/QImageViewer.h:
--------------------------------------------------------------------------------
 1 | #pragma once
 2 | #include <QWidget>
 3 | #include <QImage>
 4 | 
 5 | class QImageViewer :
 6 |     public QWidget
 7 | {
 8 |     Q_OBJECT
 9 | public:
10 |     QImageViewer(QWidget*parent = Q_NULLPTR);
11 |     virtual ~QImageViewer(void);
12 | 
13 |     void setImage(QImage &image);
14 |     QImage getImage() { return m_sourceImage; }
15 |     QRect getSelection() { return m_selection; }
16 |     QImage getSelectionImage();
17 |     void zoom();
18 |     QPointF screenToWorld(QPointF &pt, bool includeRotation = true);
19 |     QPointF worldToScreen(QPointF &pt, bool includeRotation = true);
20 | 
21 |     void SetRefinedRect(int x, int y, int width, int height);
22 | 
23 |     inline QVector<QLineF> getPixelBoundary(QRect &rect);
24 | 
25 | protected:
26 |     virtual void paintEvent(QPaintEvent * event);
27 |     virtual void mouseMoveEvent(QMouseEvent * event);
28 |     virtual void mousePressEvent(QMouseEvent * event);
29 |     virtual void mouseReleaseEvent(QMouseEvent * event);
30 |     virtual void keyPressEvent(QKeyEvent * event);
31 |     virtual void wheelEvent(QWheelEvent *event);
32 |     virtual void mouseDoubleClickEvent(QMouseEvent * event);
33 | 
34 |     QTransform getTransform(bool includeRotation = true);
35 | 
36 | signals:
37 |     void SelectedRect(QRect);
38 |     void Coordinate(QString);
39 | 
40 | 
41 | private:
42 |     QImage m_sourceImage;
43 | 
44 |     qreal m_scale;
45 |     qreal m_rotation;
46 |     QPointF m_scaleBasePt;
47 | 
48 |     QPointF m_lastPressedMousePt;
49 |     QRect m_selection;
50 | 
51 |     QRect m_refined;
52 | 
53 |     bool m_buttonLeftPressed;
54 |     bool m_buttonMiddlePressed;
55 | };
56 | 


--------------------------------------------------------------------------------
/MyImageViewer/GeneratedFiles/ui_MyImageViewer.h:
--------------------------------------------------------------------------------
 1 | /********************************************************************************
 2 | ** Form generated from reading UI file 'MyImageViewer.ui'
 3 | **
 4 | ** Created by: Qt User Interface Compiler version 5.11.1
 5 | **
 6 | ** WARNING! All changes made in this file will be lost when recompiling UI file!
 7 | ********************************************************************************/
 8 | 
 9 | #ifndef UI_MYIMAGEVIEWER_H
10 | #define UI_MYIMAGEVIEWER_H
11 | 
12 | #include <QtCore/QVariant>
13 | #include <QtWidgets/QApplication>
14 | #include <QtWidgets/QGridLayout>
15 | #include <QtWidgets/QLabel>
16 | #include <QtWidgets/QWidget>
17 | #include "qimageviewer.h"
18 | 
19 | QT_BEGIN_NAMESPACE
20 | 
21 | class Ui_MyImageViewerClass
22 | {
23 | public:
24 |     QGridLayout *gridLayout;
25 |     QImageViewer *widget;
26 |     QLabel *label;
27 | 
28 |     void setupUi(QWidget *MyImageViewerClass)
29 |     {
30 |         if (MyImageViewerClass->objectName().isEmpty())
31 |             MyImageViewerClass->setObjectName(QStringLiteral("MyImageViewerClass"));
32 |         MyImageViewerClass->resize(929, 668);
33 |         gridLayout = new QGridLayout(MyImageViewerClass);
34 |         gridLayout->setSpacing(6);
35 |         gridLayout->setContentsMargins(11, 11, 11, 11);
36 |         gridLayout->setObjectName(QStringLiteral("gridLayout"));
37 |         widget = new QImageViewer(MyImageViewerClass);
38 |         widget->setObjectName(QStringLiteral("widget"));
39 | 
40 |         gridLayout->addWidget(widget, 1, 0, 1, 1);
41 | 
42 |         label = new QLabel(MyImageViewerClass);
43 |         label->setObjectName(QStringLiteral("label"));
44 | 
45 |         gridLayout->addWidget(label, 0, 0, 1, 1);
46 | 
47 |         gridLayout->setRowStretch(1, 1);
48 | 
49 |         retranslateUi(MyImageViewerClass);
50 | 
51 |         QMetaObject::connectSlotsByName(MyImageViewerClass);
52 |     } // setupUi
53 | 
54 |     void retranslateUi(QWidget *MyImageViewerClass)
55 |     {
56 |         MyImageViewerClass->setWindowTitle(QApplication::translate("MyImageViewerClass", "MyImageViewer", nullptr));
57 |         label->setText(QString());
58 |     } // retranslateUi
59 | 
60 | };
61 | 
62 | namespace Ui {
63 |     class MyImageViewerClass: public Ui_MyImageViewerClass {};
64 | } // namespace Ui
65 | 
66 | QT_END_NAMESPACE
67 | 
68 | #endif // UI_MYIMAGEVIEWER_H
69 | 


--------------------------------------------------------------------------------
/MyImageViewer/MyImageViewer.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;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
 7 |     </Filter>
 8 |     <Filter Include="Header Files">
 9 |       <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
10 |       <Extensions>h;hh;hpp;hxx;hm;inl;inc;xsd</Extensions>
11 |     </Filter>
12 |     <Filter Include="Resource Files">
13 |       <UniqueIdentifier>{D9D6E242-F8AF-46E4-B9FD-80ECBC20BA3E}</UniqueIdentifier>
14 |       <Extensions>qrc;*</Extensions>
15 |       <ParseFiles>false</ParseFiles>
16 |     </Filter>
17 |     <Filter Include="Form Files">
18 |       <UniqueIdentifier>{99349809-55BA-4b9d-BF79-8FDBB0286EB3}</UniqueIdentifier>
19 |       <Extensions>ui</Extensions>
20 |     </Filter>
21 |     <Filter Include="Resource Files">
22 |       <UniqueIdentifier>{D9D6E242-F8AF-46E4-B9FD-80ECBC20BA3E}</UniqueIdentifier>
23 |       <Extensions>qrc;*</Extensions>
24 |       <ParseFiles>false</ParseFiles>
25 |     </Filter>
26 |     <Filter Include="Generated Files">
27 |       <UniqueIdentifier>{71ED8ED8-ACB9-4CE9-BBE1-E00B30144E11}</UniqueIdentifier>
28 |       <Extensions>moc;h;cpp</Extensions>
29 |       <SourceControlFiles>False</SourceControlFiles>
30 |     </Filter>
31 |   </ItemGroup>
32 |   <ItemGroup>
33 |     <ClCompile Include="main.cpp">
34 |       <Filter>Source Files</Filter>
35 |     </ClCompile>
36 |     <ClCompile Include="MyImageViewer.cpp">
37 |       <Filter>Source Files</Filter>
38 |     </ClCompile>
39 |     <ClCompile Include="QImageViewer.cpp">
40 |       <Filter>Source Files</Filter>
41 |     </ClCompile>
42 |   </ItemGroup>
43 |   <ItemGroup>
44 |     <QtMoc Include="MyImageViewer.h">
45 |       <Filter>Header Files</Filter>
46 |     </QtMoc>
47 |     <QtMoc Include="QImageViewer.h">
48 |       <Filter>Header Files</Filter>
49 |     </QtMoc>
50 |   </ItemGroup>
51 |   <ItemGroup>
52 |     <QtUic Include="MyImageViewer.ui">
53 |       <Filter>Form Files</Filter>
54 |     </QtUic>
55 |   </ItemGroup>
56 |   <ItemGroup>
57 |     <QtRcc Include="MyImageViewer.qrc">
58 |       <Filter>Resource Files</Filter>
59 |     </QtRcc>
60 |   </ItemGroup>
61 |   <ItemGroup>
62 |     <ResourceCompile Include="MyImageViewer.rc" />
63 |   </ItemGroup>
64 | </Project>


--------------------------------------------------------------------------------
/.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 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
  1 | ## Ignore Visual Studio temporary files, build results, and
  2 | ## files generated by popular Visual Studio add-ons.
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 27 | # Uncomment if you have tasks that create the project's static files in wwwroot
 28 | #wwwroot/
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 30 | # MSTest test Results
 31 | [Tt]est[Rr]esult*/
 32 | [Bb]uild[Ll]og.*
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 36 | TestResult.xml
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 38 | # Build Results of an ATL Project
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 40 | [Rr]eleasePS/
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 47 | 
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258 | 
259 | # Python Tools for Visual Studio (PTVS)
260 | __pycache__/
261 | *.pyc


--------------------------------------------------------------------------------
/MyImageViewer/MyImageViewer.vcxproj:
--------------------------------------------------------------------------------
  1 | <?xml version="1.0" encoding="utf-8"?>
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/MyImageViewer/QImageViewer.cpp:
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  1 | #include "QImageViewer.h"
  2 | #include <QSize>
  3 | #include <QResizeEvent>
  4 | #include <QPainter>
  5 | #include <QDebug>
  6 | 
  7 | QImageViewer::QImageViewer(QWidget*parent /*= 0*/)
  8 |     :QWidget(parent)
  9 | {
 10 |     m_scale = 1.0;
 11 |     m_rotation = 0.0;
 12 |     m_scaleBasePt = QPointF(0, 0);
 13 |     m_buttonLeftPressed = false;
 14 |     m_buttonMiddlePressed = false;
 15 |     setMouseTracking(true);
 16 | }
 17 | 
 18 | QImageViewer::~QImageViewer(void)
 19 | {
 20 | }
 21 | 
 22 | void QImageViewer::setImage(QImage &image)
 23 | {
 24 |     m_sourceImage = image;
 25 |     //zoom();
 26 | }
 27 | 
 28 | QImage QImageViewer::getSelectionImage()
 29 | {
 30 |     if (m_sourceImage.isNull())
 31 |     {
 32 |         return QImage();
 33 |     }
 34 | 
 35 |     QImage img;
 36 |     if (m_rotation != 0)
 37 |     {
 38 |         QTransform t;
 39 |         t.rotate(m_rotation);
 40 |         img = m_sourceImage.transformed(t);
 41 | 
 42 |         QPointF c1(m_sourceImage.width() / qreal(2), m_sourceImage.height() / qreal(2));
 43 |         QPointF c2(img.width() / qreal(2), img.height() / qreal(2));
 44 | 
 45 |         QRect r = m_selection.translated((c2 - c1).toPoint());
 46 |         img = img.copy(r);
 47 |     }
 48 |     else
 49 |     {
 50 |         img = m_sourceImage.copy(m_selection);
 51 |     }
 52 | 
 53 |     return img;
 54 | }
 55 | 
 56 | void QImageViewer::zoom()
 57 | {
 58 |     if (!m_sourceImage.isNull())
 59 |     {
 60 |         double sx = m_sourceImage.width() * 1.01 / this->width();
 61 |         double sy = m_sourceImage.height() * 1.01 / this->height();
 62 |         m_scale = 1. / qMax(sx, sy);
 63 |         qDebug() << QStringLiteral("放大倍数：%1").arg(m_scale);
 64 |         qreal x = this->width() - m_sourceImage.width() * m_scale;
 65 |         qreal y = this->height() - m_sourceImage.height() * m_scale;
 66 |         m_scaleBasePt = QPointF(x / 2, y / 2);
 67 |         repaint();
 68 |     }
 69 | }
 70 | 
 71 | QPointF QImageViewer::screenToWorld(QPointF &pt, bool includeRotation/* = true*/)
 72 | {
 73 |     QTransform t = getTransform(includeRotation);
 74 |     QTransform t1 = t.inverted();
 75 |     return t1.map(pt);
 76 | }
 77 | 
 78 | QPointF QImageViewer::worldToScreen(QPointF &pt, bool includeRotation/* = true*/)
 79 | {
 80 |     QTransform t = getTransform(includeRotation);
 81 |     return t.map(pt);
 82 | }
 83 | 
 84 | 
 85 | void QImageViewer::SetRefinedRect(int x, int y, int width, int height)
 86 | {
 87 |     m_refined = QRect(x, y, width, height);
 88 |     repaint();
 89 | }
 90 | 
 91 | 
 92 | QVector<QLineF> QImageViewer::getPixelBoundary(QRect &rect)
 93 | {
 94 |     QVector<QLineF> lines;
 95 |     QPointF left, right, top, buttom;
 96 |     for (int y = rect.y(); y < rect.y() + rect.height(); ++y)
 97 |     {
 98 |         left = worldToScreen(QPointF(rect.x() - 1, y));
 99 |         right = worldToScreen(QPointF(rect.x() + rect.width() + 1, y));
100 |         lines.append(QLineF(left, right));
101 |     }
102 |     for (int x = rect.x(); x < rect.x() + rect.width(); ++x)
103 |     {
104 |         top = worldToScreen(QPointF(x, rect.y() - 1));
105 |         buttom = worldToScreen(QPointF(x, rect.y() + rect.height() + 1));
106 |         lines.append(QLineF(top, buttom));
107 |     }
108 |     return lines;
109 | }
110 | 
111 | void QImageViewer::paintEvent(QPaintEvent * event)
112 | {
113 |     QPainter p(this);
114 |     p.fillRect(this->rect(), Qt::gray);
115 | 
116 |     p.save();
117 |     QTransform transform = getTransform();
118 |     p.setWorldTransform(transform);
119 |     p.drawImage(QPoint(0, 0), m_sourceImage);
120 |     p.restore();
121 | 
122 |     if (!m_selection.isNull())
123 |     {
124 |         p.save();
125 |         QTransform transform = getTransform(false);
126 |         p.setWorldTransform(transform);
127 |         QVector<QLineF> lines;
128 |         qreal x1 = m_selection.left();
129 |         qreal y1 = m_selection.top();
130 |         qreal x2 = m_selection.right();
131 |         qreal y2 = m_selection.bottom();
132 | 
133 |         lines.append(QLineF(x1, y1, x2, y1));
134 |         lines.append(QLineF(x2, y1, x2, y2));
135 |         lines.append(QLineF(x2, y2, x1, y2));
136 |         lines.append(QLineF(x1, y2, x1, y1));
137 | 
138 |         QPen pen(Qt::red);
139 |         pen.setStyle(Qt::PenStyle::DashDotLine);
140 |         QTransform t1 = transform.inverted();
141 |         QPointF pt = t1.map(QPointF(0, 0));
142 |         QPointF pt1 = t1.map(QPointF(1, 0));
143 |         pen.setWidthF(abs(pt1.x() - pt.x()));
144 |         p.setPen(pen);
145 |         p.drawLines(lines);
146 |         p.restore();
147 |     }
148 | 
149 |     if (!m_refined.isNull())
150 |     {
151 |         p.save();
152 |         QTransform transform = getTransform(false);
153 |         p.setWorldTransform(transform);
154 |         QVector<QLineF> lines;
155 |         qreal x1 = m_refined.left();
156 |         qreal y1 = m_refined.top();
157 |         qreal x2 = m_refined.right();
158 |         qreal y2 = m_refined.bottom();
159 | 
160 |         lines.append(QLineF(x1, y1, x2, y1));
161 |         lines.append(QLineF(x2, y1, x2, y2));
162 |         lines.append(QLineF(x2, y2, x1, y2));
163 |         lines.append(QLineF(x1, y2, x1, y1));
164 | 
165 |         QPen pen(Qt::green);
166 |         //pen.setStyle(Qt::PenStyle::DashDotLine);
167 |         QTransform t1 = transform.inverted();
168 |         QPointF pt = t1.map(QPointF(0, 0));
169 |         QPointF pt1 = t1.map(QPointF(1, 0));
170 |         pen.setWidthF(abs(pt1.x() - pt.x()));
171 |         p.setPen(pen);
172 |         p.drawLines(lines);
173 |         p.restore();
174 |     }
175 | 
176 |     if (m_scale > 30)
177 |     {
178 |         //1.获得视场内点坐标
179 |         QPointF tl = screenToWorld(QPointF(this->x(), this->y()));
180 |         QPointF br = screenToWorld(QPointF(this->size().width(), this->size().height()));
181 |         QRect rectInView(tl.toPoint(), br.toPoint());
182 | 
183 |         QPen pen(Qt::gray);
184 |         p.setPen(pen);
185 |         QVector<QLineF> lines = getPixelBoundary(rectInView);
186 |         p.drawLines(lines);
187 |         //p.restore();
188 |     }
189 | 
190 |     if (m_scale > 48)
191 |     {
192 |         //qDebug() << "paint value!";
193 |         //1.获得视场内点坐标
194 |         QPointF tl = screenToWorld(QPointF(this->x(), this->y()));
195 |         QPointF br = screenToWorld(QPointF(this->size().width(), this->size().height()));
196 | 
197 |         //TODO：获取每个点的像素值
198 |         QRect rectInView(tl.toPoint(), br.toPoint());
199 |         QVector<QPointF> pointsOnScreen;
200 |         QVector<QString> valueString;
201 | 
202 |         for (int y = rectInView.y(); y < rectInView.y() + rectInView.height(); ++y)
203 |         {
204 |             for (int x = rectInView.x(); x < rectInView.x() + rectInView.width(); ++x)
205 |             {
206 |                 QRgb pixValue = m_sourceImage.pixel(x, y);
207 |                 QPointF pointOnScreen = worldToScreen(QPointF(x + 0.5, y + 0.5));
208 |                 pointsOnScreen.push_back(pointOnScreen);
209 |                 valueString.push_back(QString::number(qGray(pixValue)));
210 |             }
211 | 
212 |         }
213 | 
214 |         //画出像素值
215 |         QPen pen(Qt::gray);
216 |         p.setPen(pen);
217 |         QFont font;
218 |         font.setFamily("Times");
219 |         font.setPointSize(8);
220 |         p.setFont(font);
221 |         for (int i = 0; i < pointsOnScreen.size(); ++i)
222 |         {
223 |             int strWidth = p.fontMetrics().width(valueString[i]);
224 |             int strHeight = p.fontMetrics().height();
225 |             QPointF fontPoint =
226 |                 QPointF(pointsOnScreen[i]
227 |                     - QPointF(strWidth / 2.0, -strHeight / 4.0));
228 |             QRect fontRect(fontPoint.x() - 1,
229 |                 fontPoint.y() - strHeight + strHeight / 8,
230 |                 strWidth + 2, strHeight + +strHeight / 8);
231 |             p.setPen(Qt::gray);
232 |             p.setBrush(QBrush(Qt::gray));
233 |             p.drawRect(fontRect);
234 |             p.setPen(Qt::black);
235 |             p.drawText(fontPoint, valueString[i]);
236 |         }
237 |     }
238 | }
239 | 
240 | void QImageViewer::mouseMoveEvent(QMouseEvent * event)
241 | {
242 |     if (m_buttonLeftPressed)
243 |     {
244 |         QPointF curPt = event->pos();
245 |         QPointF pt1 = screenToWorld(m_lastPressedMousePt, false);
246 |         QPointF pt2 = screenToWorld(curPt, false);
247 | 
248 |         m_selection = QRect(QPoint(qMin(pt1.x(), pt2.x()), qMin(pt1.y(), pt2.y())), QPoint(qMax(pt1.x(), pt2.x()), qMax(pt1.y(), pt2.y())));
249 |         repaint();
250 |     }
251 |     else if (m_buttonMiddlePressed)
252 |     {
253 |         QPointF mv = event->pos() - m_lastPressedMousePt;
254 |         m_scaleBasePt += mv;
255 |         m_lastPressedMousePt = event->pos();
256 |         repaint();
257 |     }
258 |     if (!m_sourceImage.isNull())
259 |     {
260 |         QPointF curPt = event->pos();
261 |         QPointF pt2 = screenToWorld(curPt, false);
262 |         //qDebug() << pt2.toPoint();
263 |         int x = pt2.x();
264 |         int y = pt2.y();
265 |         QRgb pixValue = m_sourceImage.pixel(x, y);
266 |         QString str = "[" + QString::number(x) + "," +
267 |             QString::number(y) + "]---" +
268 |             QString::number(qGray(pixValue));
269 |         emit Coordinate(str);
270 |     }
271 | }
272 | 
273 | void QImageViewer::mousePressEvent(QMouseEvent * event)
274 | {
275 |     if (event->button() == Qt::LeftButton)
276 |         m_buttonMiddlePressed = true;
277 |     //m_buttonLeftPressed = true;
278 |     else if (event->button() == Qt::MidButton)
279 |         m_buttonMiddlePressed = true;
280 |     else if (event->button() == Qt::RightButton)
281 |     {
282 |     }
283 |     m_lastPressedMousePt = event->pos();
284 | }
285 | 
286 | void QImageViewer::mouseReleaseEvent(QMouseEvent * event)
287 | {
288 |     m_buttonLeftPressed = false;
289 |     m_buttonMiddlePressed = false;
290 |     if (event->button() == Qt::LeftButton)
291 |     {
292 |         emit SelectedRect(m_selection);
293 |         //qDebug() << m_selection;
294 |     }
295 |     if (event->button() == Qt::RightButton)
296 |     {
297 |         m_selection = QRect();
298 |         m_refined = QRect();
299 |         emit SelectedRect(m_selection);
300 |         repaint();
301 |     }
302 | }
303 | 
304 | void QImageViewer::keyPressEvent(QKeyEvent * event)
305 | {
306 | 
307 | }
308 | 
309 | void QImageViewer::wheelEvent(QWheelEvent *event)
310 | {
311 |     if (!m_sourceImage.isNull())
312 |     {
313 |         QPoint angle = event->angleDelta();
314 | 
315 |         if (event->modifiers() == Qt::ShiftModifier)
316 |         {
317 |             m_rotation += angle.y() / 8;
318 |         }
319 |         else
320 |         {
321 |             QPointF pt1 = event->posF();
322 |             QPointF p = worldToScreen(QPointF(0, 0));
323 | 
324 |             QPointF pt2;
325 |             if (angle.y() > 0)
326 |             {
327 |                 pt2 = pt1 + (p - pt1)*0.618;
328 |                 m_scale *= 0.618;
329 |             }
330 |             else
331 |             {
332 |                 pt2 = pt1 + (p - pt1) / 0.618;
333 |                 m_scale /= 0.618;
334 |             }
335 | 
336 |             QTransform rotationTransform;
337 |             QPointF c(m_sourceImage.width() / qreal(2), m_sourceImage.height() / qreal(2));
338 |             rotationTransform.translate(c.x(), c.y());
339 |             rotationTransform.rotate(m_rotation);
340 |             rotationTransform.translate(-c.x(), -c.y());
341 | 
342 |             QTransform scalingTransform;
343 |             scalingTransform.scale(m_scale, m_scale);
344 | 
345 |             QPointF a3 = (scalingTransform.map(rotationTransform.map(QPointF(0, 0)))); //ok
346 | 
347 |             QPointF pt3 = pt2 - a3;
348 |             m_scaleBasePt = pt3;
349 |         }
350 | 
351 |         qDebug() << QStringLiteral("放大倍数：%1").arg(m_scale);
352 |         repaint();
353 |     }
354 | }
355 | 
356 | void QImageViewer::mouseDoubleClickEvent(QMouseEvent * event)
357 | {
358 |     if (event->button() == Qt::LeftButton)
359 |     {
360 |         zoom();
361 |     }
362 | }
363 | 
364 | QTransform QImageViewer::getTransform(bool includeRotation/* = true*/)
365 | {
366 |     QTransform transform;
367 |     if (!m_sourceImage.isNull())
368 |     {
369 |         transform.translate(m_scaleBasePt.x(), m_scaleBasePt.y());
370 | 
371 |         transform.scale(m_scale, m_scale);
372 |         if (includeRotation)
373 |         {
374 |             QPointF c(m_sourceImage.width() / qreal(2), m_sourceImage.height() / qreal(2));
375 |             transform.translate(c.x(), c.y());
376 |             transform.rotate(m_rotation);
377 |             transform.translate(-c.x(), -c.y());
378 |         }
379 | 
380 |     }
381 |     return transform;
382 | }
383 | 


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