mouse.x and accumulated mouse.dx

[u9]

what is the difference between mouse.x and accumulating mouse.dx. Thy the following code. It appears that mouse.dx is not really the change in mouse.x from last call. It seems to be affected by the acceleration of the mouse and maybe other stuff. Moving slowly, mouse.dx and dy change more then mouse.x and y (yellow text) every call, but if i move the mouse quickly then mouse.dx and dy (red text) moves slower.

Is this a bug or a feature? Why don't the two texts move equally fast?


Call main

Sub main()
graphics.initialize 800, 600
key.initialize
mouse.initialize

Dim x, y
x = mouse.x
y = mouse.y

Dim font
font = graphics.createFont( "system", 10 )

Dim bRunning
bRunning = True
Do While Not( key.pressed( 0 ) Or key.pressed( 1 ) )
mouse.update

' I subtract here due to small error in v1.7.1
x = x - mouse.dx
y = y - mouse.dy

graphics.clear
graphics.settext "mouse.x and y", mouse.x - 20, mouse.y - 8, font, &h99ffff00
graphics.settext "mouse.Dx and Dy", x - 20, y - 8, font, &h99ff0066
graphics.display
Loop

mouse.terminate
key.terminate
graphics.terminate
End Sub


[Guilect]

Strange.
Investigating.