向GDI +位图添加一定百分比的噪声失败

如何解决向GDI +位图添加一定百分比的噪声失败

我已经编写了这段代码，该代码生成一个像素矢量，以“ noise”设置。问题是无论我做什么，我只会得到一条NW-SE线。不是随机的点。我在做什么错了？

void CPixelNoiseGenerator::GeneraterandomNoise(NoiseAmount eNoiseAmount,UINT nNoiseAmount,UINT nWidth,UINT nHeight,std::vector<CPoint>& vecPoints)
{
    unsigned long long nNumPixels = nWidth * nHeight,nNumNoisePixels = 0;
    nNumNoisePixels = (nNumPixels * nNoiseAmount) / 100;
    vecPoints.clear();

    if (nNumNoisePixels == 0)
        return;

    UINT nWidthdistance = (nWidth * nNoiseAmount) / 100,nHeightdistance = (nHeight * nNoiseAmount) / 100;

    std::random_device rd;
    std::mt19937 generator(rd());
    std::uniform_real_distribution<> distribution(0.0,(nWidth < nHeight ? nHeightdistance : nWidthdistance) * 1.0);
    auto dice = std::bind(distribution,generator);

    do
    {
        for(UINT x = 0; x < nWidth; x += nWidthdistance)
            for (UINT y = 0; y < nHeight; y += nHeightdistance)
            {
                CPoint pt; // = GetRandomPointOnDesign(nWidth,nHeight,generator);
                pt.x = x + distribution(generator);
                pt.y = y + distribution(generator);
                vecPoints.push_back(pt);
            }
    } while (vecPoints.size() <= nNumNoisePixels);

}