Я пытаюсь уменьшить расстояние между мазками (на QPixmap) путем деления длины линии. Если я умножу линию, то интервал увеличивается, но интервал никогда не уменьшается. Также кажется, что минимальная длина строки может быть одна. Очевидно, что его разделение уменьшит это - возможно, ниже допустимой суммы? Не уверен, что этоd отрицательно влияет на рисунок растрового изображения.

Вот оскорбительный код:

QLineF line = QLineF(lastPoint, endPoint);
float lineLength = line.length();
qDebug() < line.length();
line.setLength(lineLength / 50.0f);
qDebug() < line.length();

painter.drawPixmap(line.p1().x() - 16, line.p2().y() - 16, 32, 32, testPixmap);
pos();
        drawing = true;
    }
}

void InkSpot::mouseMoveEvent(QMouseEvent *event)
{
    if((event->buttons() & Qt::LeftButton) && drawing)
    {
        drawLineTo(event->pos());
    }
}

void InkSpot::mouseReleaseEvent(QMouseEvent *event)
{
    if(event->button() == Qt::LeftButton && drawing)
    {
        drawLineTo(event->pos());
        drawing = false;
    }
}

void InkSpot::drawLineTo(const QPoint &endPoint)
{
    QPainter painter(&pixmap);
    painter.setPen(Qt::NoPen);
    painter.setBrush(Qt::NoBrush);

    QFile *stencilInput; // file for input, assumes a SQUARE RAW 8 bit grayscale image, no JPG no GIF, no size/format header, just 8 bit values in the file
    char *brushPrototype; // raw brush prototype
    uchar *brushData; // raw brush data

    stencilInput = new QFile("C:/brush3.raw");  // open raw file
    stencilInput->open(QIODevice::ReadOnly);
    QDataStream in;
    in.setDevice(stencilInput);
    int size = stencilInput->size();  // set size to the length of the raw file

    brushPrototype = new char[size];  // create the brush prototype array
    in.readRawData(brushPrototype, size);  // read the file into the prototype
    brushData = new uchar[size];  // create the uchar array you need to construct QImage

    for (int i = 0; i < size; ++i)
        brushData[i] = (uchar)brushPrototype[i];  // copy the char to the uchar array

    QImage test(brushData, 128, 128, QImage::Format_Indexed8); // create QImage from the brush data array
     // 128x128 was my raw file, for any file size just use the square root of the size variable provided it is SQUARE
    QImage test2(128, 128, QImage::Format_ARGB32);


   QVector vectorColors(256);  // create a color table for the image
    for (int c = 0; c < 256; c++)
        vectorColors[c] = qRgb(c, c, c);

    test.setColorTable(vectorColors);  // set the color table to the image

    for (int iX = 0; iX < 128; ++iX)  // fill all pixels with 255 0 0 (red) with random variations for OIL PAINT effect
    // use your color of choice and remove random stuff for solid color
    // the fourth parameter of setPixel is the ALPHA, use that to make your brush transparent by multiplying by opacity 0 to 1
    {
        for (int iY = 0; iY < 128; ++iY)
        {
            test2.setPixel(iX, iY, qRgba(255, 100, 100, (255-qGray(test.pixel(iX, iY)))*0.5));
        }
    }
    // final convertions of the stencil and color brush
    QPixmap testPixmap = QPixmap::fromImage(test2);
    QPixmap testPixmap2 = QPixmap::fromImage(test);

    painter.setBrush(Qt::NoBrush);
    painter.setPen(Qt::NoPen);
    // in a paint event you can test out both pixmaps
    QLineF line = QLineF(lastPoint, endPoint);
    float lineLength = line.length();
    qDebug() < line.length();
    line.setLength(lineLength / 50.0f);
    qDebug() < line.length();

    painter.drawPixmap(line.p1().x() - 16, line.p2().y() - 16, 32, 32, testPixmap);

    //delete all dynamically allocated objects with no parents
    delete [] brushPrototype;
    delete [] brushData;
    delete stencilInput;


    lastPoint = endPoint;

}


void InkSpot::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.setPen(Qt::NoPen);
    painter.setBrush(Qt::NoBrush);
    QRect rect = event->rect();
    painter.drawPixmap(rect, pixmap, rect);
    update();

}