File size: 4,214 Bytes
0936134 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 |
(function(){
var strokeColor = [ 'rgba(89,48,27,1)','rgba(223,134,74,1)',
'rgba(76,31,115,1)','rgba(204,95,211,1)',
'rgba(4,100,102,1)','rgba(26,228,225,1)',
'rgba(2,64,144,1)','rgba(0,128,254,1)',
'rgba(51,75,40,1)','rgba(148,194,99,1)'];
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext('2d');
var startAngles = [], endAngles = [], nextAngles = [];
var xc, yc, innerCircleRad, outerCircleRad;
var toValue, fromValue, steps = 1000, piIndex;
function draw(){
if (canvas.getContext){
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
xc = (canvas.width/2);
yc = (canvas.height/2);
innerCircleRad = getRad(10);
outerCircleRad = getRad(15);
drawOuterCircle(xc, yc, outerCircleRad);
drawText();
fromValue = pi[0];
piIndex = 1;
setInterval(drawLines,100);
}
}
function getRad(r){
if(canvas.height < canvas.width){
return (yc - (canvas.height/r)) ;
}else{
return (xc - (canvas.width/r)) ;
}
}
function xParametricCoord(xc, r, angle){
return xc + r * Math.cos(angle);
}
function yParametricCoord(yc, r, angle){
return yc + r * Math.sin(angle);
}
function degreesToRad(degrees){
return (degrees * Math.PI / 180);
}
function radToDegrees(rad){
return (rad * 180 / Math.PI);
}
function drawText() {
ctx.fillStyle = 'white';
ctx.font = "10pt Roboto";
var xt, yt, segmentMed;
textCircleRad = getRad(25);
for(var i=0; i<10; i++){
segmentMed = (startAngles[i] + endAngles[i])/2;
xt = xParametricCoord(xc-10, textCircleRad, segmentMed);
yt = yParametricCoord(yc+7, textCircleRad, segmentMed);
ctx.fillText("//"+i, xt, yt);
}
}
function drawInnerCircle(xc, yc, innerCircleRad){
ctx.beginPath();
ctx.lineWidth = 2;
ctx.strokeStyle = 'black';
ctx.arc(xc,yc,40,0,Math.PI*2,true);
ctx.moveTo(xc+innerCircleRad,yc);
ctx.arc(xc,yc,innerCircleRad,0,Math.PI*2,true);
ctx.stroke();
}
function drawOuterCircle(xc, yc, outerCircleRad){
var sectionRad = degreesToRad(36);
var gapRad = degreesToRad(3);
var startAngle = gapRad, endAngle;
for(var i=1; i<=10; i++){
endAngle = (i*sectionRad);
ctx.beginPath();
ctx.lineWidth = 5;
ctx.strokeStyle = strokeColor[i-1];
ctx.arc(xc, yc, outerCircleRad, startAngle , endAngle, false);
ctx.stroke();
ctx.beginPath();
ctx.strokeStyle = 'black';
ctx.arc(xc, yc, outerCircleRad, endAngle, endAngle+gapRad, false);
ctx.stroke();
startAngles.push(startAngle);
nextAngles.push(startAngle);
endAngles.push(endAngle);
startAngle = endAngle+gapRad;
}
}
function getNextSequentialAngle(value){
var nextAngle = nextAngles[value];
var spacingRatio = 0.005;
if((nextAngles[value] + spacingRatio) < endAngles[value]){
nextAngles[value] = nextAngles[value] + spacingRatio;
}else{
nextAngles[value] = startAngles[value]+ 0.002;
}
return nextAngle;
}
function getNextRandomAngle(value){
return ((Math.random() * startAngles[value]) + endAngles[value]);
}
function drawLines(){
if (canvas.getContext){
var x0, y0, x1, y1, fromValueNextAngle, toValueNextAngle;
if(piIndex <= steps){
ctx.save();
toValue = pi[piIndex];
fromValueNextAngle = getNextSequentialAngle(fromValue), toValueNextAngle = getNextSequentialAngle(toValue);
x0=xParametricCoord(xc, innerCircleRad, fromValueNextAngle);
y0=yParametricCoord(yc, innerCircleRad, fromValueNextAngle);
x1=xParametricCoord(xc, innerCircleRad, toValueNextAngle);
y1=yParametricCoord(yc, innerCircleRad, toValueNextAngle);
console.log("pi");
ctx.beginPath();
ctx.strokeStyle = strokeColor[toValue];
ctx.lineWidth = 1;
ctx.moveTo(x0, y0);
ctx.quadraticCurveTo(xc, yc, x1,y1);
ctx.stroke();
ctx.restore();
fromValue = toValue;
piIndex++;
}
}
}
draw();
})();
|