隨機線條效果實現

class TCbwAnimationEffect_RandomLine : public TCbwAnimationEffect { // 隨機線

    virtual bool __fastcall BuildMaskMat(cv::Mat& destMat, cv::Mat& srcMat,

        TRect displayRect);

    BYTE * FOccurredLines;

public:

    __fastcall TCbwAnimationEffect_RandomLine();

};

 

__fastcall TCbwAnimationEffect_RandomLine::TCbwAnimationEffect_RandomLine()

    : TCbwAnimationEffect() {

    EffectType = cetRandomLine;

    FOccurredLines = NULL;

}

 

bool __fastcall TCbwAnimationEffect_RandomLine::BuildMaskMat(cv::Mat& destMat,

    cv::Mat& srcMat, TRect displayRect) {

    bool horzFlag = (MyOptionType.Items[1].CurrentValue == 0); // 方向

    TRect wholeRect(0, 0, displayRect.right - displayRect.left,

        displayRect.bottom - displayRect.top);

    int totalLineNumber = (horzFlag ? wholeRect.bottom : wholeRect.right);

    int number = double(FCurrentIndex + 1) / FTotalFramesInOnePeriod * totalLineNumber;

    if (!FOccurredLines) {

        FOccurredLines = new BYTE[totalLineNumber];

        ZeroMemory(FOccurredLines, totalLineNumber);

    }

    int destNumber =

        number -int(double(FCurrentIndex) / FTotalFramesInOnePeriod * totalLineNumber);

    BYTE * pDst = destMat.data;

    vector<int>totalLines;

    for (int i = 0; i < totalLineNumber; ++i)

        totalLines.push_back(i);

    while (destNumber-- > 0 && totalLines.size()) {

        int n = random(totalLines.size());

        while (FOccurredLines[totalLines[n]]) {

            totalLines.erase(totalLines.begin() + n);

            n = random(totalLines.size());

        }

        FOccurredLines[totalLines[n]] = 1;

        totalLines.erase(totalLines.begin() + n);

    }

    for (int row = 0; row < destMat.rows; ++row)

        for (int col = 0; col < destMat.cols; ++col) {

            bool inFlag = (horzFlag ? FOccurredLines[row] :

                FOccurredLines[col]);

            *pDst++ = inFlag ? 255 : 0;

        }

    if (FCurrentIndex == FTotalFramesInOnePeriod - 1) {

        delete FOccurredLines;

        FOccurredLines = NULL;

    }

    return true;

}
 

演示效果