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function setup()
{
createCanvas(600, 600);
}
function nPoints()
{
return parseInt($("#npoints").val());
}
function shouldMul()
{
return $("#should_mul").prop("checked");
}
function amount()
{
return parseFloat($("#amount").val());
}
function getPos(number)
{
angle = 2*PI * number/(nPoints());
return [cos(angle)*250+300, sin(angle)*250+300];
}
function draw()
{
if (shouldMul())
$("#amount").prop("step", 0.1);
else
$("#amount").prop("step", 1);
background(255);
ellipseMode(CENTER);
noStroke();
fill(0);
for (var i = 0; i < nPoints(); i++)
ellipse(getPos(i)[0], getPos(i)[1], 3, 3);
stroke(0);
for (var i = 0; i < nPoints(); i++)
{
if (shouldMul())
{
stroke(map(map((amount()*i)%nPoints(), 0, nPoints(), 0, 256) - map(i, 0, nPoints(), 0, 256), -256, 256, 0, 256), map(i, 0, nPoints(), 0, 256), map((amount()*i)%nPoints(), 0, nPoints(), 0, 256));
line(getPos(i)[0], getPos(i)[1], getPos((amount()*i)%nPoints())[0], getPos((amount()*i)%nPoints())[1]);
}
else
{
stroke(0, map(i, 0, nPoints(), 0, 256), map((amount()+i)%nPoints(), 0, nPoints(), 0, 256));
line(getPos(i)[0], getPos(i)[1], getPos((amount()+i)%nPoints())[0], getPos((amount()+i)%nPoints())[1]);
}
}
}
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