TrackScreenUtils.h File Reference

Macros
#define	TimeToScreen(t, scale, scroll)   (int(floor((t)*(scale)+0.5)) - (scroll))
	Given a TimeValue t, if you have the time scale and time scroll factors, this macro returns the screen space X for that time.
#define	ScreenToTime(s, scale, scroll)   ((int)floor((s)/(scale) + (scroll)/(scale)+0.5))
	Given a screen coordinate s, if you have the scale and scroll factors, this macro will return a TimeValue for that screen position.
#define	ValueToScreen(v, h, scale, scroll)   (h-int(floor((v)*(scale)+0.5)) - (scroll))
	Given a Value v, if you have the value scale and value scroll factors, this macro returns the screen space Y for that value.
#define	ScreenToValue(s, h, scale, scroll)   ((float(h)-(float(s)+float(scroll)))/(scale))
	Given a screen coordinate s, if you have the scale and scroll factors, this macro will return a value for that screen position.
#define	ScaleAboutOrigin(val, origin, scale)   ((((val)-(origin))*(scale))+(origin))