基于OpenCV的视频图像组态 (1) ：时钟

来源：互联网发布：flower dance知乎编辑：程序博客网时间：2024/04/30 08:12

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="res\clock\background.png" width="1"/>    <item angle="284" centerx="true" centery="true" height="1" name="hour" picfilename="res\clock\Hour.png" width="0"/>    <item angle="176" centerx="true" centery="true" height="1" name="minute" picfilename="res\clock\Minute.png" width="0"/>    <item angle="150" centerx="true" centery="true" height="1" name="second" picfilename="res\clock\Second.png" width="0"/>    <item centerx="true" centery="true" height="1" picfilename="res\clock\Highlight.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

class 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 = 100virtual 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("\n");    return result;} void __fastcall TCbwGdiMeta::SetContent(UnicodeString value) {    FXmlContent->ReadFromString(value);} void __fastcall TCbwGdiMeta::SetXmlContent(CbwXmlNode * node) {    if(node != FXmlContent) {        UnicodeString content = node->GetHint("\n");        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。

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