[Qt-interest] Using Qpainter/Qgraphics for a gps car-like

[Gustavo B. Schenkel]

The problem is the points, they have too much numbers after the 
dot, in the screen they show all in the same place.

Then i don't know if i need do some calculation to transform this 
numbers to others.

i am sending my painter code. I am using the setWindow function 
but i still don't know much about it.

void RenderArea::paintEvent(QPaintEvent * /* event */)
{

    static const QPointF square[4] = {
            QPointF(-29.683436, -53.800570),
            QPointF(-29.683795, -53.799620),
            QPointF(-29.684242, -53.800749),
            QPointF(-29.684478, -53.799623)
        };


    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.setWindow(-33,-57, 10, 10);
    painter.save();
    painter.drawPolygon(square, 4);
    painter.restore();
}

-- 

Schenkel, Gustavo B.
Qt/C++ Developer