Aug 15 2007 | 12:13 am

- Aug 15 2007 | 8:48 am
- Aug 15 2007 | 7:52 pmWell, if someone wants to start and manage a wiki about jit.gl.lua, Ithink it could be quite useful, but it's not something I can reallyget too much involved with. Of course that doesn't me I wouldn't postcontent.wesOn 8/15/07, MarkDavid Hosale wrote:> Hi Alexandre-> This is cool stuff. I've been getting into using Lua with Jitter as> well. I wonder how many of us are out there using it? Maybe there> should be (or is there already?) a jit.gl.lua wiki or something for> things like this. Does anyone else think this is a good idea? Wes?...> -MarkDavid>>> On Aug 14, 2007, at 5:13 PM, Alexandre Quessy wrote:>> > Hi all,> > I am getting quite familiar with Lua and OpenGL. This is a great> > tool. It works very well for 2D and 3D graphics using textures and> > such.> >> > I ported some of Robert Penner's easing equations to Lua in order> > to create motion effects with jit.gl.lua. Here they are, for you> > delight. Maybe I could port them all and distribute in a more> > formal way, but I don't think I will. (exercise left to the reader !)> >> > Cheers,> >> > -----> > -- Robert Penner easing equations for Adobe ActionScript.> > -- Translated to Lua (only some of my favorites)> > -- see http://www.robertpenner.com/easing/> > -- Open source under the BSD License.> > -- Copyright (c) 2001 Robert Penner> > -- All rights reserved.> >> > -- simple linear tweening - no easing> > -- t: current time, b: beginning value, c: change in value, d:> > duration> > function linearTween(t, b, c, d)> > return c*t/d + b> > end> >> > ------------/ QUADRATIC EASING: t^2 ------------------/> >> > -- quadratic easing in - accelerating from zero velocity> > -- t: current time, b: beginning value, c: change in value, d:> > duration> > -- t and d can be in frames or seconds/milliseconds> > function easeInQuad(t, b, c, d)> > return c*(t/d)*t + b> > end> >> > -- quadratic easing out - decelerating to zero velocity> > function easeOutQuad(t, b, c, d)> > return -c *(t/d)*(t-2) + b> > end> >> > ------------/ SINUSOIDAL EASING: sin(t) --------------/> >> > -- sinusoidal easing in - accelerating from zero velocity> > -- t: current time, b: beginning value, c: change in position, d:> > duration> > function easeInSine(t, b, c, d)> > return -c * math.cos(t/d * (math.pi/2)) + c + b;> > end> >> > -- sinusoidal easing out - decelerating to zero velocity> > function easeOutSine(t, b, c, d)> > return c * math.sin(t/d * (math.pi/2)) + b;> > end> >> > -- sinusoidal easing in/out - accelerating until halfway, then> > decelerating> > function easeInOutSine(t, b, c, d)> > return -c/2 * (math.cos(math.pi*t/d) - 1) + b;> > end> >> > ------------/ EXPONENTIAL EASING: 2^t ----------------/> >> > -- exponential easing in - accelerating from zero velocity> > -- t: current time, b: beginning value, c: change in position, d:> > duration> > function easeInExpo(t, b, c, d)> > if (t==0) then> > return b> > else> > return c * math.pow(2, 10 * (t/d - 1)) + b> > end> > end> >> > -- exponential easing out - decelerating to zero velocity> > function easeOutExpo(t, b, c, d)> > if (t==d) then> > return b+c> > else> > return c * (-math.pow(2, -10 * t/d) + 1) + b> > end> > end>>>
- Aug 20 2007 | 3:40 pmMay I suggest http://dactilde.com/index.php?title=JitGLLua ? :)