franim

sample html canvas animation loop wrapper

Usage

var wrap = franim('wrapperid', {
    config : {
        resize: true
    },
    setup : function setup(ctx) {
        ctx.fillStyle = "black";
        ctx.fillRect(0,0,this.anim.getWidth(),this.anim.getHeight());
    },
    update : function update(time) {
        this.x = ~~(Math.random()*this.anim.getWidth());
        this.y = ~~(Math.random()*this.anim.getHeight());
    },
    draw : function draw(ctx) {
        ctx.fillStyle = "red";
        ctx.fillRect(this.x, this.y, 1, 1);
    }
});

Table of Contents generated with DocToc

• arguments
  • wrapperid
  • context
  • context.config.resize
  • context.init
  • context.update
  • context.draw
• this.anim
  • this.anim.pause()
  • this.anim.resume()
  • this.anim.getHeight()
  • this.anim.getWidth()
  • this.anim.getDelta()
• License

arguments

wrapperid

Type: String required

the id of canvas wrapper where new canvace elemnt will be appened

context

Type: Object required

object which contains required functions for animation loop

context.config.resize

Type: Boolean Default: false

if true make canvas element resize with its wrapper element

context.init

Type: Function optional it is called once before animation is started and context is passed to it as argument

function setup(ctx)

context.update

Type: Function optional it is called on every frame before draw and AnimationFrame's time argument is passed to it as argument

function update(time)

context.draw

Type: Function required it is called on every frame, after update (if is defined) and context is passed to it as argument

function draw(ctx)

if update is not defined then context is passed to it as a first argument and AnimationFrame's time argument as second argument

function draw(ctx,time)

this.anim

here is api to control animation loop and some helper functions

this.anim.pause()

it cancels Animation Frame and stops loop

this.anim.resume()

it request Animation Frame and starts loop

this.anim.getHeight()

returns height of canvas element

this.anim.getWidth()

returns width of canvas element

this.anim.getDelta()

returns delta time in seconds between frames

example: if you had code like this: x += 1; in your update, after 1 second it will be different depending on frame rate but if you write x += 100*this.anim.getDelta(); it will be changed by 100 after 1 second on any frame rate

License

The MIT License

Copyright (c) 2014, Irakli Safareli

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.