# Tagged Questions

Easing functions specify the rate of change of a parameter over time.

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### How do I lerp between values that loop (such as hue or rotation)?

View Demo I'm trying to make the joint rotate smoothly around the center of the canvas, toward the angle of mouse pointer. What I have works, but I want it to animate the shortest distance possible ...
3k views

### What are easing functions?

I found this cool website for game development and it has a list of easing functions: Although the site contains a description of what they're for, it goes over my head. What are easing ...
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### How do I simulate a swinging pendulum?

I want to simulate a rope with a weight attached, swinging back and forth like a pendulum. Any actual physics is overkill; it's just endlessly repeating the same motion. JQuery has a the "swing" ease ...
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### Easing Functions

I started to involve myself with easing functions (Flash AS3), came about in trying to understand TweenLite and Robert Penner's website: http://www.robertpenner.com/easing/ The question I have is ...
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### Interpolation using cubic Bezier curves

I am trying to create an interpolate function for an animation library to achieve a tweening effect between frames. I want this to work with Bezier curves. I have created a jsFiddle (here) of my ...
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### Cubic bezier for easing?

I would like to find out what Y is if X is a certain number from a cubic bezier curve to make a custom easing function, like it's done on this site: http://cubic-bezier.com/ Does anyone know a formula ...
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### Vary speed of enemy smoothly

Hey. I'm trying to create an enemy that travels at a speed s on screen but I'm having trouble with trying to make the speed vary in a smooth motion. Basically, I can get the enemy to move at a ...
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### Problems using easing equations in C# XNA

I'm having some trouble using the easing equations suggested by Robert Penner for ActionScript (http://www.robertpenner.com/easing/, and a Flash demo here) in my C# XNA game. Firstly, what is the ...
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### Animating a background 'pulse' with easing equation

I'm trying to find a suitable easing equation (or other method) to animate an object so that it 'pulses' (imagine a 'spike' on a music visualiser, or see the image I drew badly below) 'v' is the ...
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### Stop a rotating object at a specified angle?

I'm working in JavaScript with HTML5 and the canvas. I have an object which is rotating at a certain speed, and I need the object's rotation to slow down gradually and the front of the object to stop ...
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### Easing towards stepped value

I'm currently developing this rhythm game in lua (on top of a c++ engine) and I'm having trouble keeping a steady playhead position for the song currently playing. The playhead position that the ...
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### Easing equations with moving end points

Usually easing equations have 4 parameters: time duration begin point end point For example: public static float EaseOutQuad(float currTime, float begin, float end, float duration) { currTime ...
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### Multiple concurrent Tweens

I'd like to be able to direct a game object to move to a new target position over a certain amount of time. There are lots of different easing functions available, but for now let's say I'm just ...
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### Customizing ease functions

I have this function that acts as a ease in: protected static function easeIn(ratio:Number):Number { return ratio * ratio * ratio; } Where ratio is a value between 0 ...
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### Looking for an easing equation

I am looking for an easing equation with the following properties: It starts at a velocity of zero, and eases into a constant velocity of 1 for a duration of t_1 seconds (cubic, exp, or quintic, ...
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### How to convert strict limit in position into gradual slow down?

The player moves a spell object, the spell must stay withing a certain range of the player. The spell is moved using a physics system and it has mass and velocity. Currently when the spell goes out ...