how can a pixel be a floating point number

[babu198649]

hi
sometimes the pixels are calculated with floating point precison(ex.QPointF class)
But, a pixel is always an interger value(ex:1024*768 pixels )

if (0,0)represents 1st pixel in the screen(top left corner) then

which pixel does (0.1,0.1) represent.

[Brandybuck]

Don't think in terms of pixels, think in terms of a coordinate plane. Your physical monitor may have integral pixels, but not every paint device is a monitor with integral dots. SVG and postscript are examples. Painter transforms also need floating point values.