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var CIRCLE = 0;
var SQUARE_SHAPE = 1;
var points = [];
var currentAngle = 0;
var drawing = false;
var shapes = [CIRCLE, CIRCLE];
var radii = [107, 17];
var shapeNameList = ['circle', 'square'];
var speed = 0.5;
function removeElementById(id)
{
(function(x){x.parentNode.removeChild(x);})(document.getElementById(id));
}
function getNumShapes()
{
var i = 0;
do
{
var x = document.getElementById("rt"+i);
i++;
}
while (x != null);
return i-1;
}
function deleteShape(num)
{
removeElementById("rt"+num);
removeElementById("st"+num);
removeElementById("shape"+num);
removeElementById("radius"+num);
removeElementById("del"+num);
removeElementById("br"+num);
}
function updateShapes()
{
shapes = [];
radii = [];
var nShapes = getNumShapes();
for (var i = 0; i < nShapes; i++)
{
var sel = document.getElementById("shape" + i);
var val = sel.options[sel.selectedIndex].value;
shapes.push(shapeNameList.indexOf(val));
radii.push(document.getElementById("radius" + i).value);
}
speed = parseFloat(document.getElementById("speed").value);
}
function loadShapes()
{
var nShapes = getNumShapes();
for (var i = 0; i < nShapes; i++)
{
var sel = document.getElementById("shape" + i);
sel.selectedIndex = shapes[i];
document.getElementById("radius" + i).value = radii[i];
}
document.getElementById("speed").value = speed;
}
function addShape()
{
updateShapes();
var nShapes = getNumShapes();
var shapesDiv = document.getElementById("shapes");
shapesDiv.innerHTML += '<span id="rt' + nShapes + '">Radius:</span> <input type="number" value="50" id="radius' + nShapes + '"> <span id="st' + nShapes + '">Shape:</span> ' +
'<select id="shape' + nShapes + '"><option value="circle">Circle</option><option value="square">Square</option></select> <button id="del' + nShapes + '" onclick="deleteShape(' + nShapes + ');">Delete</button><br id="br' + nShapes + '">';
shapes.push(0);
radii.push(50);
loadShapes();
}
function startDrawing()
{
drawing = true;
points = [];
updateShapes();
}
function squine(angle)
{
angle %= TWO_PI;
if (angle >= QUARTER_PI && angle <= 3*QUARTER_PI)
return 1;
if (angle >= 5*QUARTER_PI && angle <= 7*QUARTER_PI)
return -1;
if (angle > 7*QUARTER_PI || angle < QUARTER_PI)
return map((angle+QUARTER_PI)%TWO_PI-QUARTER_PI, -QUARTER_PI, QUARTER_PI, -1, 1);
return -map(angle, 3*QUARTER_PI, 5*QUARTER_PI, -1, 1);
}
function squos(angle)
{
if (angle >= 7*QUARTER_PI || angle <= QUARTER_PI)
return 1;
if (angle >= 3*QUARTER_PI && angle <= 5*QUARTER_PI)
return -1;
if (angle > QUARTER_PI && angle < 3*QUARTER_PI)
return -map(angle, QUARTER_PI, 3*QUARTER_PI, -1, 1);
return map(angle, 5*QUARTER_PI, 7*QUARTER_PI, -1, 1);
}
function getPointOnShape(shape, radius, centerX, centerY, angle)
{
if (shape == SQUARE_SHAPE)
return [radius*squos(angle)+centerX, radius*squine(angle)+centerY];
else if (shape == CIRCLE)
return [radius*cos(angle)+centerX, radius*sin(angle)+centerY];
}
function setup()
{
createCanvas(700, 700).parent("canvasSpot");
ellipseMode(CENTER);
}
function draw()
{
updateShapes();
try{
if (drawing)
{
background(255);
stroke(0);
noFill();
var centerX = width/2;
var centerY = height/2;
var nextPoint;
for (var i = 0; i < shapes.length; i++)
{
var angle = map(currentAngle%radii[i], 0, radii[i], 0, TWO_PI);
nextPoint = getPointOnShape(shapes[i], radii[i], centerX, centerY, angle);
centerX = nextPoint[0];
centerY = nextPoint[1];
}
points.push([centerX, centerY]);
if (points.length != 1 && dist(points[0][0], points[0][1], points[points.length-1][0], points[points.length-1][1]) < speed)
drawing = false;
for (var i = 1; i < points.length; i++)
{
line(points[i-1][0], points[i-1][1], points[i][0], points[i][1]);
}
currentAngle += speed;
if (drawing)
{
noStroke();
fill(255, 0, 0);
ellipse(centerX, centerY, 7, 7);
}
}}catch(e){document.write(e + "<br>");}
}
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