2D movement timing via deltatime

This code has been declared by its author to be Public Domain code.

2D movement timing via deltatime by Rob

2001

Simple example of how time elapsed since the last frame can help you position your sprites, and indeed - 3D objects the same across all framerates and hardware.

;Robs simple movement timing in 2D
Global deltatime#,oldmillisecs#,thistime#,x#,xspd#

xspd=.5

;setup
Graphics 640,480,16,1
SetBuffer BackBuffer()


oldmillisecs=MilliSecs()
While Not KeyHit(1)
	;get time elapsed since last frame
	
	thistime# = MilliSecs()
	deltatime#=thistime#-oldmillisecs#
	oldmillisecs#=thistime#
	;graphics with timing
	Cls
	
	x=x + deltatime*xspd   ; this is movement by time elapsed.

	If x>640 Then x=0
	Rect x,y,16,16,1
	
	;uncomment for testing. movement will reach a to b in the same time despite how much is on screen
	;For i=0 To 1000
	;	Rect 100,100,100,100
	;Next 
	
	Flip
		
Wend
End

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