Screen-Time-Value Macros

These are macros used when working with Track View to scale into and out of screen space. More...

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))

Detailed Description

These are macros used when working with Track View to scale into and out of screen space.

Macro Definition Documentation

TimeToScreen

#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.

ScreenToTime

#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.

ValueToScreen

#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.

ScreenToValue

#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.

ScaleAboutOrigin

#define ScaleAboutOrigin	(		val,
			origin,
			scale
	)		((((val)-(origin))*(scale))+(origin))