38 lines
722 B
JavaScript
38 lines
722 B
JavaScript
|
//////////////////
|
||
|
|
// HELPERS ///////
|
||
|
|
//////////////////
|
||
|
|
|
||
|
|
Math.TAU = 6.2831853072;
|
||
|
|
|
||
|
|
// The poor man's jQuery
|
||
|
|
function $(query){
|
||
|
|
return document.querySelector(query);
|
||
|
|
}
|
||
|
|
function $all(query){
|
||
|
|
return document.querySelectorAll(query);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Wide Sigmoid
|
||
|
|
function sigmoid(x){
|
||
|
|
return x / (1 + Math.abs(x));
|
||
|
|
}
|
||
|
|
|
||
|
|
// Create retina canvas
|
||
|
|
function createCanvas(canvas, width, height){
|
||
|
|
|
||
|
|
// The "canvas" arg not provided? make a new one!
|
||
|
|
if(arguments.length==2){
|
||
|
|
width = arguments[0];
|
||
|
|
height = arguments[1];
|
||
|
|
canvas = document.createElement("canvas");
|
||
|
|
}
|
||
|
|
|
||
|
|
// Set difference in width & height
|
||
|
|
canvas.width = width*2;
|
||
|
|
canvas.height = height*2;
|
||
|
|
canvas.style.width = width;
|
||
|
|
canvas.style.height = height;
|
||
|
|
|
||
|
|
return canvas;
|
||
|
|
|
||
|
|
}
|