Status Update

So where did I get

• accelerate() method no longer has a delay value as a parameter. This means the the method _advanceNoDelay() has disappeared and the code it held folded into accelerate().

• I did not remove the wait() method. I am using it in examples and dont want to loose it. But if you want you can take it out.

• I found a better way to calculate velocity at each point in an acceleration and have implemented that.

• I have implemented a SimpleAccelerator class that is the parallel of BezierAccelerator and is used when one of dF of dT is set equal to null.

• I have implemented unit testing for

  • Function values. Checking that the bezier accelerator and simple accelerator keep getting the same answers.
  • Completion of acceleration and wait operations. I check the promises are resolved correctly even for kill(). Have not yet tested overwrite of acceleration()

• The code is now lint free - I agree that it certainly makes for more uniform code

• I built a little sample game in example/game that uses the Accelerator class to play a slot machine style experience. It might be helpful.

• The example in this readme.md does not work because the ticker function called as a result of window.requestAnimationFrame(ticker);

• is passed an absolute time of day in milliseconds not a PIXI.ticker delta.

What will I do next - if anything.

• Build a few more tests. Particularly related to sequences of wait, accelerate, kill
• Work on using the BezierAccelerator's callback function to signal end of an acceleration. There is a problem doing this when a kill() is called and I have not figured out the problem.

Accelerate

Things to do

• Wait function
• Kill function
• Ammend/Overwrite
• Handle last tick
• Handle accelerate without distance constraint

Usage

Example

import Accelerator from 'Accelerator'
const initVelocity = 0
const carAccelerator = new Accelerator(initialVelocity)

// animate on frame
function ticker(delta)
{
    carAccelerator.advanceTimeBy(deltaTime)
    car.position.x = carAccelerator.getPosition()

    window.requestAnimationFrame(ticker);
}
window.requestAnimationFrame(ticker);

// Promise based
carAccelerator.accelerate(newV1, overTime1, overDistance1)
.then(carAccelerator.accelerate(newV2, overTime2, overDistance2))
.then(carAccelerator.accelerate(newV3, overTime3, overDistance3))
.then(console.log('done'))

Instantiation

const initialVelocity = 0;
const options = {
	timeInterval: 1/60, //default
	allowOverwrite: true //default
}
const myAccelerator = new Accelerator(initialVelocity, options)

Advance

Advance the moving objects time by a time interval

myAccelerator.advance(delta)

Get position

Gets the current position of the moving object

myAccelerator.getPosition()

Set velocity

Gets the current velocity of the moving object

myAccelerator.getVelocity(v)

Set velocity

Sets the velocity. This cannot bet set during an acceleration

myAccelerator.setVelocity(v)

Accelerate

Instructs the object to start a velocity change

myAccelerator.accelerate(vF, tF, dF, delay = false)

Wait

Lets a timeinterval pass during which the accelerator moves along at a constant velocity.

myAccelerator.wait(delay)

Kill

Stops any current acceleration & resolves the acceleration promise

myAccelerator.kill()

Commands

Help

Show all commands

npm run help

Build

Build, watch & lint

npm start

Build transpiled, and transpiled & minified

npm run build

Test

Run tests

npm test

Run the tests & watch

npm run lint:watch

Lint

Run the linter

npm run lint

Run the linter & watch

npm run lint:watch