示例#1
0
Image BrushStrokerCustomBrush::drawDabImage(const TabletInputData &data, QRect *rect)
{
    Q_ASSERT(data.pressure > 0);

    Vec2D radiusVec;
    radiusVec.rx() = radiusBase() * data.pressure;
    radiusVec.ry() = radiusVec.x() * (1.0 - _setting.flattening);

    _lastMinorRadius = radiusVec.y();

    //qDebug() << "radius" << radiusVec.x << radiusVec.y;

    QPainterPath ellipse;
    ellipse.addEllipse(data.pos, radiusVec.x(), radiusVec.y());

    QRect dabRect;

    if (_setting.rotation)
    {
        QTransform rotation;
        rotation.rotate(_setting.rotation);
        ellipse = rotation.map(ellipse);

        dabRect = ellipse.boundingRect().toAlignedRect();
    }
    else
    {
        dabRect = QRectF(QPointF(data.pos - radiusVec), QSizeF(2.0 * radiusVec)).toAlignedRect();
    }

    Image dabImage(dabRect.size());
    dabImage.clear();

    Painter dabPainter(&dabImage);

    dabPainter.translateShape(-dabRect.topLeft());

    if (_setting.tableWidth == 1 && _setting.tableHeight == 1)
    {
        // no gradient
        dabPainter.setPixel(pixel());
    }
    else
    {
        ArgbGradient gradient;
        gradient.addStop(0, pixel());
        gradient.addStop(_setting.tableWidth, pixel() * _setting.tableHeight);
        gradient.addStop(1, Pixel(0));

        dabPainter.setBrush(Malachite::Brush::fromRadialGradient(gradient, data.pos, radiusVec));
    }

    dabPainter.drawPath(ellipse);

    dabPainter.end();

    *rect = dabRect;
    return dabImage;
}