# math.EaseInOut

number math.EaseInOut( number progress, number easeIn = 0, number easeOut = 1 )

# Description

Calculates the progress of a value fraction, taking in to account given easing fractions

# Arguments

1 number progress
Fraction of the progress to ease, from 0 to 1.
2 number easeIn = 0
Fraction of how much easing to begin with, from 0 to 1.
3 number easeOut = 1
Fraction of how much easing to end with, from 0 to 1.

# Returns

1 number
"Eased" Value, from 0 to 1

## Example

Calculates the easing of three situations

print(math.EaseInOut(0.1, 0.1, 0.1)) print(math.EaseInOut(0.2, 0.1, 0.1)) print(math.EaseInOut(0.3, 0.1, 0.1))
Output: 0.055555... 0.166666... 0.277777...

## Example

Interactive preview of the curve this function can generate.

local f = vgui.Create( "DFrame" ) f:SetSize( 500, 500 ) f:Center() f:MakePopup() local sliderIn = vgui.Create( "DNumSlider", f ) sliderIn:Dock( TOP ) sliderIn:SetMinMax( 0, 4 ) sliderIn:SetText( "Ease In" ) local sliderOut = vgui.Create( "DNumSlider", f ) sliderOut:Dock( TOP ) sliderOut:SetMinMax( 0, 4 ) sliderOut:SetText( "Ease Out" ) local sliderMax = vgui.Create( "DNumSlider", f ) sliderMax:Dock( TOP ) sliderMax:SetMinMax( 1, 2 ) sliderMax:SetValue( 1 ) sliderMax:SetText( "Value Range Max" ) local quality = 128 local oldPaint = f.Paint f.Paint = function( pnl, w, h ) oldPaint( pnl, w, h ) surface.SetDrawColor( 255, 0, 0, 255 ) local lastPos = { x = 0, y = 0 } for i=0, quality do local pos = { x = i / quality * pnl:GetWide(), y = math.EaseInOut( math.Remap( i / quality, 0, 1, 0, sliderMax:GetValue() ), sliderIn:GetValue(), sliderOut:GetValue() ) * pnl:GetTall() } surface.DrawLine( lastPos.x, lastPos.y, pos.x, pos.y ) lastPos = pos end local frac = CurTime() % 1 local easeVal = math.EaseInOut( math.Remap( frac, 0, 1, 0, sliderMax:GetValue() ), sliderIn:GetValue(), sliderOut:GetValue() ) surface.DrawCircle( frac * pnl:GetWide(), easeVal * pnl:GetTall(), 4, 255, 255, 255 ) surface.SetDrawColor( 255, 255, 255, easeVal * 255 ) surface.DrawRect( 10, pnl:GetTall() - 10 - 48, 48, 48 ) end
Output: