基于OpenCV的视频图像组态 (1) ：时钟

写在前面

本系列博客URL：

http://www.cnblogs.com/drgraph

http://blog.csdn.net/arwen

配套软件下载地址：

http://www.czwenwu.com/YeeVingSetup.exe

配套软件含三个可执行文件：YeeVingDriver.exe，YeeVingPlayer.exe，WatchDog.exe

其中，YeeVingDriver.exe是双目触控屏的驱动程序，内含键盘鼠标钩子，安装或运行的时候有可能会当成病毒。

WatchDog.exe是无人值守软件

YeeVingPlayer.exe是广告播放软件客户端。

本系列博客是在上述三个软件研发过程中的片面记录，基本上是属于想到哪写到哪的，不系统。主要目的是自己整理归纳一下，并期望与更多朋友交流。

QQ/微信：282397369

EMail： drgraph@qq.com

需求

时钟的需求来自于广告播放软件客户端。

橱窗用户反馈：在播放屏幕上，不仅仅是需要显示视频、图片、动画、文字、PPT等多媒体素材，还希望能看到一些小插件，看到比如时钟、天气预报等内容。当然，在界面定制的时候，指定一个小块显示相应内容就OK。

初步解决

先来处理时钟。

既然先说了小插件，就先参考一下WINDOWS中的小工具。

当然，时钟会有很多风格，先出一版这种效果的。

其实就是一个画图操作，不过想要改这个UI效果，如果用代码来实现，好象还得要比较繁琐的支持，在网上看到一种用图片叠加起来的时钟。

把几个图片素材下载下来，再重新命名一下。

最终就是采用Gdiplus技术，把这几张图片按顺序画出：

FGraphics->DrawImage(&image, x, y, w, h);

该转的就转一下。

Gdiplus::Bitmap * bitmap = RotateImage(&image, locked_theta, w, h);

float dx = x + w / 2 - bitmap->GetWidth() / 2;

float dy = y + h / 2 - bitmap->GetHeight() / 2;

FGraphics->DrawImage(bitmap, dx, dy, bitmap->GetWidth(), bitmap->GetHeight());

delete bitmap;

好象也没有什么好说的。可以拼成这种效果

模块化

在实现的过程中，突然发现，这种由多张图片叠加组成的场合还有一些，干脆提炼成一个模块，后续可以直接调用。

这里面最主要的是配置，每张图片都可以指定。最容易想到的解决方案就是采用XML方式来定义。

比如上面的时钟，可以用XML定义如下：

<GdiMeta>

    <item angle="0" centerx="true" centery="true" height="1" picfilename="resclockackground.png" width="1"/>

    <item angle="284" centerx="true" centery="true" height="1" name="hour" picfilename="resclockHour.png" width="0"/>

    <item angle="176" centerx="true" centery="true" height="1" name="minute" picfilename="resclockMinute.png" width="0"/>

    <item angle="150" centerx="true" centery="true" height="1" name="second" picfilename="resclockSecond.png" width="0"/>

    <item centerx="true" centery="true" height="1" picfilename="resclockHighlight.png" width="1"/>

</GdiMeta>

既然是自己用，那就先定好格式。几张图片就用几个节点。每个节点含以下属性：

picfilename为图片文件名，采用相对路径，也可以是绝对路径

angle为旋转角度，指绕本图像中心的旋转角度

centerx、centery为横向、纵向中心对齐标志

height、width为高宽比例，指该图形在最终图形中所占的高宽比例。

name为本图片对应名称，后续可以根据该名称进行相应值的修改。

思路理清了，模块化也就容易了，头文件        

c

lass TCbwGdiMeta : public TRectangle {

typedef TRectangle inherited;

Gdiplus::Graphics * FGraphics;

CbwXmlNode * FXmlContent;

void __fastcall DrawXmlNode(CbwXmlNode * xmlNode, Gdiplus::RectF rf, Gdiplus::Graphics * FGraphics, Gdiplus::Brush * brush, Gdiplus::Pen * pen);

UnicodeString __fastcall GetContent();

void __fastcall SetContent(UnicodeString value);

void __fastcall SetXmlContent(CbwXmlNode * node);

public:

CBW_META_OBJECT(TCbwGdiMeta, TRectangle);

virtual void __fastcall DoDraw(); // 画出对象

virtual bool __fastcall PreDraw();

 

void __fastcall SetProperty(UnicodeString name, UnicodeString value); // 设置XML节点属性，如 hour.angle = 100

virtual void __fastcall DoAddToXmlNode(CbwXmlNode * node);

virtual void __fastcall DoGetFromXmlNode(CbwXmlNode * node, int& index);

 

__published:

__property UnicodeString Content = { read = GetContent, write = SetContent };

__property CbwXmlNode * XmlContent = { read = FXmlContent, write = SetXmlContent };

};

源文件

__fastcall TCbwGdiMeta::~TCbwGdiMeta() {

    delete FXmlContent;

}

 

void __fastcall TCbwGdiMeta::Initial() {

ObjectClassType = cctGdiMeta;

Name = THelper::FormatString("GdiMeta%d", MetaIndex[int(ObjectClassType)]);

++MetaIndex[int(ObjectClassType)];

FXmlContent = new CbwXmlNode("GdiMeta");

}

 

bool __fastcall TCbwGdiMeta::PreDraw() {

if (!inherited::PreDraw())

return false;

 

return true;

}

 

void __fastcall TCbwGdiMeta::DoDraw() {

FGraphics = GetGraphicsForRotate(Canvas);

    FGraphics->SetSmoothingMode(Gdiplus::SmoothingModeAntiAlias);//SmoothingModeHighQuality);

TPoint p0 = TPoint(Points[0].x * Ratio, Points[0].y * Ratio);

TPoint p1 = TPoint(Points[1].x * Ratio, Points[1].y * Ratio);

TRect r = TTypeConvert::Points2Rect(p0, p1);

Gdiplus::Brush * brush = BrushByData(BrushData, r);

Gdiplus::RectF rf(r.left, r.top, r.Width(), r.Height());

 

Gdiplus::Pen gpen(Color2GPColor(PenData->Color), PenData->Width * Ratio);

for(int i = 0; i < FXmlContent->ElementNumber; ++i) {

CbwXmlNode * node = FXmlContent->Elements(i);

    DrawXmlNode(node, rf, FGraphics, brush, &gpen);

}

 

if(brush)

    delete brush;

delete FGraphics;

}

 

void __fastcall TCbwGdiMeta::DrawXmlNode(CbwXmlNode * xmlNode, Gdiplus::RectF rf, Gdiplus::Graphics * FGraphics, Gdiplus::Brush * brush, Gdiplus::Pen * pen) {

UnicodeString picName = xmlNode->AttributeValueByName("picFileName");

if(picName.Length()) {

if(picName.Pos(L":") == 0)

picName = THelper::File::GetApplicationPath() + picName;

if(FileExists(picName)) {

        Gdiplus::Image image(picName.w_str(), false);

            float x = xmlNode->AttributeValueByName("x", "0").ToDouble();

            float y = xmlNode->AttributeValueByName("y", "0").ToDouble();

            float w = xmlNode->AttributeValueByName("width", "0").ToDouble();

            float h = xmlNode->AttributeValueByName("height", "0").ToDouble();

            double locked_theta = xmlNode->AttributeValueByName("angle", "0").ToDouble();

            while(locked_theta >= 360)

                locked_theta -= 360;

            while(locked_theta < 0)

                locked_theta += 360;

 

            double width = rf.Width, height = rf.Height;

            x *= width;

            w *= width;

            y *= height;

            h *= height;

            if(w == 0) // 未定义宽度，则由原始宽度计算

                w = image.GetWidth() * Ratio;

            if(h == 0) // 未定义高度，则由原始高度计算

                h = image.GetHeight() * Ratio;

 

            if(xmlNode->BoolAttributeValueByName("centerx", "true"))

                x = (width - w) / 2;

            if(xmlNode->BoolAttributeValueByName("centery", "true"))

                y = (height - h) / 2;

 

            if(locked_theta) {

                Gdiplus::Bitmap * bitmap = RotateImage(&image, locked_theta, w, h);

                float dx = x + w / 2 - bitmap->GetWidth() / 2;

                float dy = y + h / 2 - bitmap->GetHeight() / 2;

                FGraphics->DrawImage(bitmap, dx, dy, bitmap->GetWidth(), bitmap->GetHeight());

                delete bitmap;

}

        else

            FGraphics->DrawImage(&image, x, y, w, h);

}

}

}

 

void __fastcall TCbwGdiMeta::SetProperty(UnicodeString pname, UnicodeString value) {

    UnicodeString name = THelper::String::GetStringAt(pname, ".", 0);

    UnicodeString attr = THelper::String::GetStringAt(pname, ".", 1);

    CbwXmlNode * destNode = FXmlContent->NodeByAttribute("name", name);

    if(destNode)

        destNode->AddAttribute(attr, value);

}

 

void __fastcall TCbwGdiMeta::DoAddToXmlNode(CbwXmlNode * node) {

    inherited::DoAddToXmlNode(node);

    CbwXmlNode * thisNode = node->LastNode;

    thisNode->AddElement(FXmlContent->Clone());

}

 

void __fastcall TCbwGdiMeta::DoGetFromXmlNode(CbwXmlNode * node, int& index) {

    inherited::DoGetFromXmlNode(node, index);

    CbwXmlNode * thisNode = node->LastNode;

    FXmlContent->Assign(thisNode);

}

 

UnicodeString __fastcall TCbwGdiMeta::GetContent() {

    UnicodeString result = FXmlContent->GetHint("
");

    return result;

}

 

void __fastcall TCbwGdiMeta::SetContent(UnicodeString value) {

    FXmlContent->ReadFromString(value);

}

 

void __fastcall TCbwGdiMeta::SetXmlContent(CbwXmlNode * node) {

    if(node != FXmlContent) {

        UnicodeString content = node->GetHint("
");

        SetContent(content);

    }

    Draw();

}

剩下的就是实时更新时钟，直接更新即可。

void __fastcall TCbwGraphForm_Player::UpdateTimeControls() {

    CBW_ITERATOR(CbwObjects, Objects) {

        TCbwGdiMeta * gdiMeta = dynamic_cast<TCbwGdiMeta *>(*it);

        if(gdiMeta && CanObjectBeVisible(gdiMeta)) {

            unsigned short Year, Month, Day, Hour, Minute, sec, msec;

            DecodeTime(Now(), Hour, Minute, sec, msec);

double minute = Minute + sec / 60.0;

            double hour = (Hour + minute / 60.0) * 30;

            minute = minute * 6;

            sec *= 6;

            gdiMeta->SetProperty("Hour.angle", hour);

            gdiMeta->SetProperty("Minute.angle", minute);

            gdiMeta->SetProperty("Second.angle", sec);

            gdiMeta->Draw();

        }

    }

}

如此这般，在运行时就可以看到实时时钟效果

属性处理

为了更通用地处理，再实现一个兼容xml内容的属性浏览器，主要需要增加两个属性类型：

头文件：

class CbwXmlNodeAttributePropertyItem : public OrdinalPropertyItem {

    typedef OrdinalPropertyItem inherited;

    CbwXmlNode * FDestNode;

    virtual void __fastcall GetPropertyValue();

    virtual void __fastcall SetValue(Variant var);

public:

    __fastcall CbwXmlNodeAttributePropertyItem(TObject * object,

        UnicodeString propertyName, UnicodeString displayName = "",

        bool v = true);

};

 

class CbwXmlNodePropertyItem : public ObjectPropertyItem {

    typedef ObjectPropertyItem inherited;

    CbwXmlNode * FDestNode;

    virtual void __fastcall AddItems(TList * item);

    virtual void __fastcall GetPropertyValue();

    virtual void __fastcall SetStringList(TStringList * list);

public:

    __fastcall CbwXmlNodePropertyItem(TObject * object,

        UnicodeString propertyName, UnicodeString displayName = "",

        bool v = true);

};

源代码：

__fastcall CbwXmlNodeAttributePropertyItem::CbwXmlNodeAttributePropertyItem

     (TObject * object, UnicodeString propertyName, UnicodeString displayName,

    bool v) : OrdinalPropertyItem(object, propertyName, displayName, v) {

}

 

void __fastcall CbwXmlNodeAttributePropertyItem::GetPropertyValue() {

    FDestNode = dynamic_cast<CbwXmlNode *>(Object);

    if(FDestNode)

        PropertyValue = FDestNode->AttributeValueByName(PropertyName);

}

 

void __fastcall CbwXmlNodeAttributePropertyItem::SetValue(Variant var) {

    if(FDestNode) {

        FDestNode->AddAttribute(PropertyName, var);

        CbwXmlNodePropertyItem * parent = dynamic_cast<CbwXmlNodePropertyItem *>(ParentItem);

        CbwXmlNode * node = FDestNode;//->ParentNode;

        while(parent && node) {

            if(IsPublishedProp(parent->Object, parent->PropertyName)) {

                SetObjectProp(parent->Object, parent->PropertyName, node);

                break;

            }

            parent = dynamic_cast<CbwXmlNodePropertyItem *>(parent->ParentItem);

            node = node->ParentNode;

}

}

}

 

void __fastcall CbwXmlNodePropertyItem::SetStringList(TStringList * list) {

 

}

 

void __fastcall CbwXmlNodePropertyItem::GetPropertyValue() {

PropertyValue = PropertyName;

}

 

void __fastcall CbwXmlNodePropertyItem::AddItems(TList * item) {

    int count = item->Count;

    for (int i = 0; i < count; i++) {

        CbwPropertyItem * cItem = (CbwPropertyItem*)(item->Items[i]);

        delete cItem;

    }

    delete item;

}

 

__fastcall CbwXmlNodePropertyItem::CbwXmlNodePropertyItem

     (TObject * object, UnicodeString propertyName, UnicodeString displayName,

    bool v) : ObjectPropertyItem(object, propertyName, displayName, v) {

    FreeAllItem();

    FDestNode = dynamic_cast<CbwXmlNode *>(object);

    if(!FDestNode)

        FDestNode = dynamic_cast<CbwXmlNode *>(GetObjectProp(object, propertyName));

    if(FDestNode) {

        StringList->Clear();

        int count = FDestNode->ElementNumber + FDestNode->Attributes.size();

        if(count) {

            cItemList = new PPropertyItem[count];

            int index = FDestNode->ElementNumber;

            CBW_ITERATOR_MAP(UnicodeString, UnicodeString, FDestNode->Attributes)

                cItemList[index++] = new CbwXmlNodeAttributePropertyItem(FDestNode, it->first);

            for(int i = 0; i < FDestNode->ElementNumber; ++i) {

                CbwXmlNode * node = FDestNode->Elements(i);

                UnicodeString name = node->Name;

                if(node->ContainAttribute("Name"))

                    name = node->AttributeValueByName("Name");

                cItemList[i] = new CbwXmlNodePropertyItem(node, name);

            }

            for(int i = 0; i < count; ++i) {

                StringList->Add("empty");

                cItemList[i]->ParentItem = this;

}

        }

    }

    PropertyValue = "XmlNode";

}

现在可以完全支持模拟时钟。对于数字时钟、日历、天气预报等，稍后再整理。