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examples.js
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examples.js
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arc_test ='\
// Arc and Curve Test -- test of arcs and curves\n\
// this draws five figures\n\
\n\
function radialArc (x, y, startRadius, armAngle, tangentAngle, arcRadius, extent, dir) {\n\
goto(x,y);\n\
penup();\n\
angle(armAngle);\n\
forward(startRadius);\n\
right(tangentAngle);\n\
pendown();\n\
circle(arcRadius,extent, dir);\n\
}\n\
\n\
\n\
function turbine(x,y, radius, pedals, dir) {\n\
for (i=0; i<pedals; i++) {\n\
if (dir) {\n\
radialArc (x,y, radius, 360*i/pedals, -135, 10, 90, dir);\n\
} else {\n\
radialArc (x,y, radius, 360*i/pedals, 45, 10, 90, !dir);\n\
}\n\
}\n\
}\n\
\n\
function roundedOctogon (side, radius) {\n\
repeat((8), function () {\n\
forward (side);\n\
curveright(radius,45);\n\
})\n\
}\n\
\n\
\n\
function roundedOctogonL (side, radius) {\n\
repeat((8), function () {\n\
forward (side);\n\
curveleft(radius,45);\n\
})\n\
}\n\
\n\
\n\
function circleEyeR (x, y, n, outerRadius) {\n\
goto (x, y);\n\
circle (outerRadius); //outer circle\n\
\n\
for (var i=0; i<n; i++) {\n\
goto (x, y);\n\
angle (i/n * 360);\n\
penup();\n\
forward (outerRadius);\n\
right(90)\n\
pendown();\n\
write(i)\n\
curveRight(outerRadius/2) // one inscribed circle\n\
}\n\
}\n\
\n\
function circleEyeL (x, y, n, outerRadius) {\n\
goto (x, y);\n\
circle (outerRadius); //outer circle\n\
\n\
for (var i=0; i<n; i++) {\n\
goto (x, y);\n\
angle (i/n * 360);\n\
penup();\n\
forward (outerRadius);\n\
pendown();\n\
left(90)\n\
write(i)\n\
curveLeft(outerRadius/2); // one inscribed circle\n\
}\n\
}\n\
\n\
\n\
function demo () {\n\
var CW = true;\n\
var CCW = false;\n\
var size = 2 * Math.min(maxX(), maxY())\n\
var cellSize = size/3\n\
\n\
//divide area into 6 cells: 2 vertical, 3 horizontal\n\
// centers are:\n\
v1 = +1/4 * size\n\
v2 = -1/4 * size\n\
h1 = -2/6 * size\n\
h2 = 0\n\
h3 = +2/6 * size\n\
\n\
reset();\n\
hideturtle();\n\
\n\
tSize = cellSize/2 * .90\n\
// turbine(x,y, radius, pedals, dir) {\n\
turbine (h1, v1, 10/55*tSize, 8, CW);\n\
turbine (h1, v1, 25/55*tSize, 16, CCW);\n\
turbine (h1, v1, 40/55*tSize, 32, CW);\n\
turbine (h1, v1, 55/55*tSize, 64, CCW);\n\
\n\
\n\
var pedals = 8;\n\
tSize = cellSize/2 * .90\n\
for (i=0; i<pedals; i++) {\n\
//radialArc (x, y, startRadius, armAngle, tangentAngle, arcRadius, extent, dir)\n\
radialArc (h2, v1, 10/60*tSize, 360*i/pedals, -45, 10/60*tSize, 180, CW); // inner shell\n\
radialArc (h2, v1, 40/60*tSize, 360*i/pedals, -125, 15/60*tSize, 110, CCW); //inside arc\n\
radialArc (h2, v1, 40/60*tSize, 360*i/pedals, -85, 18/60*tSize, 170, CW); //outside arcs\n\
radialArc (h2, v1, 41/60*tSize, 360*i/pedals, 0, 10/60*tSize, 360, CW); // radial circles\n\
}\n\
\n\
\n\
goto(h2, v1);\n\
circle(60/60 * tSize);\n\
\n\
goto( h1, v2)\n\
angle(0)\n\
oRadius = cellSize/2 * .9\n\
cRadius = .3 * oRadius\n\
curveLoss = cRadius * Math.tan( degToRad( 22.5))\n\
side = 2 * oRadius * Math.sin( degToRad(22.5)) - 2* curveLoss\n\
height = oRadius * Math.cos( degToRad( 22.5))\n\
penup()\n\
forward (height)\n\
pendown()\n\
right(90)\n\
backward(side/2)\n\
roundedOctogon( side, cRadius)\n\
\n\
goto( h1, v2)\n\
angle(0)\n\
oRadius = cellSize/2 * .8\n\
cRadius = .3 * oRadius\n\
curveLoss = cRadius * Math.tan( degToRad( 22.5))\n\
side = 2 * oRadius * Math.sin( degToRad(22.5)) - 2* curveLoss\n\
height = oRadius * Math.cos( degToRad( 22.5))\n\
penup()\n\
forward (height)\n\
pendown()\n\
right(90)\n\
backward(side/2)\n\
roundedOctogon( side, cRadius)\n\
\n\
goto( h1, v2)\n\
angle(22.5)\n\
oRadius = cellSize/2 * .7\n\
cRadius = .3 * oRadius\n\
curveLoss = cRadius * Math.tan( degToRad( 22.5))\n\
side = 2 * oRadius * Math.sin( degToRad(22.5)) - 2* curveLoss\n\
height = oRadius * Math.cos( degToRad( 22.5))\n\
penup()\n\
forward (height)\n\
pendown()\n\
right(90)\n\
backward(side/2)\n\
roundedOctogon( side, cRadius)\n\
\n\
goto( h1, v2)\n\
angle(22.5)\n\
oRadius = cellSize/2 * .6\n\
cRadius = .3 * oRadius\n\
curveLoss = cRadius * Math.tan( degToRad( 22.5))\n\
side = 2 * oRadius * Math.sin( degToRad(22.5)) - 2* curveLoss\n\
height = oRadius * Math.cos( degToRad( 22.5))\n\
penup()\n\
forward (height)\n\
pendown()\n\
right(90)\n\
backward(side/2)\n\
roundedOctogon( side, cRadius)\n\
\n\
circleEyeR( h2, v2, 16, cellSize/2 * .8);\n\
circleEyeL( h3, v2, 16, cellSize/2 * .8);\n\
}\n\
'
basket_weave_tessellation ='\
// Basket Weave Tessellation -- tile a space using basket weave pattern\n\
\n\
// this assumes that the smaller square is 1/2 of the larger square.\n\
// that need not be the case\n\
\n\
small = 20\n\
sSide = 2.5 * small\n\
lSide = sSide + 2 * small\n\
\n\
function vRect( sSide, lSide, fColor) {\n\
beginShape()\n\
for (var i=0; i<2; i++) {\n\
forward( sSide)\n\
right(90)\n\
forward( lSide)\n\
right(90)\n\
}\n\
fillShape( fColor)\n\
forward( sSide)\n\
}\n\
\n\
function hRect( sSide, lSide, fColor) {\n\
beginShape()\n\
for (var i=0; i<2; i++) {\n\
forward( lSide)\n\
right(90)\n\
forward( sSide)\n\
right(90)\n\
}\n\
fillShape( fColor)\n\
forward( lSide)\n\
}\n\
\n\
function square ( side, fColor) {\n\
beginShape()\n\
for (var i=0; i<4; i++) {\n\
forward( side)\n\
right(90)\n\
}\n\
fillShape( fColor)\n\
forward( side)\n\
}\n\
\n\
\n\
function demo() {\n\
reset()\n\
count = 0\n\
yB = maxY() + small\n\
xB = minX()\n\
wrap(false)\n\
right( 90)\n\
\n\
s = 50\n\
while( turtle.pos.y > minY()) {\n\
goto (xB, yB)\n\
while( turtle.pos.x < maxX()) {\n\
pendown()\n\
square(small, "yellow")\n\
penup()\n\
forward( sSide)\n\
pendown()\n\
square(small, "yellow")\n\
vRect(sSide, lSide, "lightblue")\n\
}\n\
yB = yB - small\n\
\n\
goto (xB, yB)\n\
while( turtle.pos.x < maxX()) {\n\
pendown()\n\
hRect(sSide, lSide, "red")\n\
penup()\n\
forward( sSide)\n\
}\n\
yB = yB - sSide\n\
\n\
goto (xB, yB)\n\
while( turtle.pos.x < maxX()) {\n\
pendown()\n\
square(small, "yellow")\n\
vRect(sSide, lSide, "lightblue")\n\
square(small, "yellow")\n\
penup()\n\
forward( sSide)\n\
pendown()\n\
}\n\
yB = yB - small\n\
\n\
goto (xB- lSide +small, yB)\n\
while( turtle.pos.x < maxX()) {\n\
pendown()\n\
hRect(sSide, lSide, "red")\n\
penup()\n\
forward(sSide)\n\
}\n\
yB = yB - sSide\n\
}\n\
}\n\
'
bounce ='\
// Bouncing Rectangles -- rectangles which bounce off the side of the canvas\n\
\n\
var maxX = imageContext.canvas.width/2;\n\
var maxY = imageContext.canvas.height/2;\n\
var minX = -maxX;\n\
var minY = -maxY;\n\
var maxVelocity = 12;\n\
\n\
function init_drops(n) {\n\
var drops = new Array(n);\n\
for (var i = 0; i < n; i++) {\n\
drops[i] = { // each drop is an object with a set of properties\n\
x: random(minX, maxX),\n\
y: random(minY, maxY),\n\
velocityX: random(-maxVelocity, maxVelocity),\n\
velocityY: random(-maxVelocity, maxVelocity),\n\
size: random(20,300),\n\
red:random(0,255),\n\
green:random(0,255),\n\
blue: random(0,255),\n\
alpha: Math.random(),\n\
width: random(1,15)\n\
};\n\
}\n\
return drops;\n\
}\n\
\n\
function rain (drops, n) {\n\
clear();\n\
for (var i = 0; i < n; i++) {\n\
// access each drop object\n\
var d = drops[i]; // access each drop object and react with it\n\
// if the drop hits a wall, reverse its motion direction (velocity)\n\
if (d.y < minY) {\n\
d.velocityY = -d.velocityY;\n\
}\n\
else if (d.y + d.size > maxY && d.velocityY > 0) {\n\
d.velocityY = -d.velocityY;\n\
}\n\
if (d.x - d.width/2 < minX) {\n\
d.velocityX = -d.velocityX;\n\
}\n\
else if (d.x + d.width/2 > maxX) {\n\
d.velocityX = -d.velocityX;\n\
}\n\
// paint the drop\n\
color ("rgba(" +d.red+ "," +d.green+ "," +d.blue+ "," +d.alpha +")");\n\
width(d.width);\n\
goto(d.x, d.y);\n\
forward(d.size);\n\
// move the drop for the next time\n\
d.y = d.y + d.velocityY;\n\
d.x = d.x + d.velocityX;\n\
}\n\
}\n\
\n\
function let_them_drop (n) {\n\
wrap(false);\n\
hideTurtle();\n\
drops = init_drops(n);\n\
animate(function () { rain(drops, n)}, 100);\n\
}\n\
\n\
function demo() {\n\
let_them_drop (Math.floor(maxX * maxY/2000));\n\
}\n\
'
brick_tessellation ='\
// Brick Tessellation -- tile a space using a basic brick laying pattern\n\
\n\
sSide = 15\n\
lSide = 2* sSide \n\
\n\
function vRect( sSide, lSide, fColor) {\n\
beginShape()\n\
for (var i=0; i<2; i++) {\n\
forward( sSide)\n\
right(90)\n\
forward( lSide)\n\
right(90)\n\
}\n\
fillShape( fColor)\n\
forward( sSide)\n\
}\n\
\n\
function hRect( sSide, lSide, fColor) {\n\
beginShape()\n\
for (var i=0; i<2; i++) {\n\
forward( lSide)\n\
right(90)\n\
forward( sSide)\n\
right(90)\n\
}\n\
fillShape( fColor)\n\
forward( lSide)\n\
}\n\
\n\
function demo() {\n\
reset()\n\
count = 0\n\
yB = maxY()\n\
xB = minX()\n\
wrap(false)\n\
right( 90)\n\
color("white")\n\
\n\
s = 50\n\
while( turtle.pos.y > minY()) {\n\
goto (xB, yB)\n\
while( turtle.pos.x < maxX()) {\n\
pendown()\n\
hRect(sSide, lSide, "darkred")\n\
penup()\n\
}\n\
yB = yB - sSide\n\
\n\
goto (xB - lSide/2, yB)\n\
while( turtle.pos.x < maxX()) {\n\
pendown()\n\
hRect(sSide, lSide, "darkred")\n\
penup()\n\
}\n\
yB = yB - sSide\n\
}\n\
}\n\
'
cafe_wall_illusion ='\
// Cafe Wall Illusion -- draws cafe tiles. see Wikipedia.\n\
\n\
function drawTile (h,w, tc, x, y) {\n\
goto(x,y)\n\
beginShape()\n\
for( var i=0; i<2; i=i+1) {\n\
forward(h)\n\
right(90)\n\
forward(w)\n\
right(90)\n\
}\n\
fillShape( tc)\n\
}\n\
\n\
function cafeTiles (h, w, gw, gc, off) {\n\
maxRow = 2*maxY()/h\n\
maxCol = 2*maxX()/w\n\
width(gw)\n\
color(gc)\n\
setHeading(0)\n\
for (var row=0; row<maxRow; row=row+1) {\n\
for (var col=0; col<maxCol; col=col+1) {\n\
if (col%2) {\n\
drawTile( h, w, "white", minX()+col*(w+gw/2)+(row%2*w*off), minY()+ row*(h+gw/2))\n\
} else {\n\
drawTile( h, w, "black", minX()+col*(w+gw/2)+(row%2*w*off), minY()+ row*(h+gw/2))\n\
}\n\
}\n\
}\n\
}\n\
\n\
\n\
\n\
function demo () {\n\
reset();\n\
size = Math.min( maxX(), maxY()) * .9\n\
hideturtle();\n\
\n\
var tileHeight = 50\n\
var tileWidth = 50\n\
var mortarWidth = 1\n\
var mortarColor = "#c0c0c0"\n\
var mortarColor = "#808080"\n\
var offset = .5\n\
cafeTiles( tileHeight, tileWidth, mortarWidth, mortarColor, offset);\n\
}\n\
'
circle_eye2 ='\
// Circle Eye2 -- draws a set of n inscribed circles between two concentric circles.\n\
\n\
function circleEye (x, y, n, outerRadius, innerRadius) {\n\
goto (x, y);\n\
//circle (outerRadius); //outer circle\n\
//circle (innerRadius)\n\
radius = outerRadius-innerRadius\n\
\n\
for (i=0; i<n; i++) {\n\
goto (x, y);\n\
angle (i/n * 360);\n\
penup();\n\
forward (innerRadius + radius/2);\n\
pendown();\n\
circle(radius/2); // one inscribed circle\n\
}\n\
}\n\
\n\
\n\
\n\
function demo () {\n\
reset();\n\
size = Math.min( maxX(), maxY()) * .9\n\
hideturtle();\n\
color( random(16));\n\
circleEye( 0, 0, 32, size, .2*size);\n\
}\n\
'
circle_eye ='\
// Circle Eye -- draws a set of n inscribed circles within circle\n\
\n\
function circleEye (x, y, n, outerRadius) {\n\
goto (x, y);\n\
circle (outerRadius); //outer circle\n\
\n\
for (i=0; i<n; i++) {\n\
goto (x, y);\n\
angle (i/n * 360);\n\
penup();\n\
forward (outerRadius/2);\n\
pendown();\n\
circle(outerRadius/2); // one inscribed circle\n\
}\n\
}\n\
\n\
\n\
\n\
function demo () {\n\
reset();\n\
size = Math.min( maxX(), maxY()) * .9\n\
hideturtle();\n\
color( random(16));\n\
circleEye( 0, 0, 16, size);\n\
}\n\
'
clock_BCD ='\
// Clock, BCD -- digital clock using Binary Coded Decimal (BCD) digits\n\
\n\
//*** GLOBALS ***\n\
\n\
var hour10;\n\
var hour1;\n\
var minute10;\n\
var minute1;\n\
var second10;\n\
var second1;\n\
var hSpacing;\n\
var vSpacing;\n\
\n\
var hourColor = "red"\n\
var minuteColor = "green"\n\
var secondColor = "blue"\n\
var offColor = "lightgray"\n\
\n\
\n\
//*** FUNCTIONS ***\n\
\n\
function tensDigit (number) {\n\
return Math.floor (number/10) % 10\n\
}\n\
\n\
\n\
function onesDigit (number) {\n\
return Math.floor (number % 10)\n\
}\n\
\n\
\n\
function getBinaryTime() {\n\
time = new Date\n\
hours = time.getHours()\n\
minutes = time.getMinutes()\n\
seconds = time.getSeconds()\n\
\n\
// extract the digits\n\
//hour10 = hour1 = onesDigit(hours)\n\
//min10 = tensDigit(minutes)\n\
//min1 = onesDigit(minutes)\n\
//sec10 = tensDigit(seconds)\n\
//sec1 = onesDigit(seconds)\n\
\n\
//pad digits with leading 0s\n\
//hour10 = "0000" + hour10.toString(2)\n\
//hour1 = "0000" + hour1.toString(2)\n\
//min10 = "0000" + min10.toString(2)\n\
//min1 = "0000" + min1.toString(2)\n\
//sec10 = "0000" + sec10.toString(2)\n\
//sec1 = "0000" + sec1.toString(2)\n\
\n\
//use only 4 digits\n\
//hour10 = hour10.slice(-4)\n\
//hour1 = hour1.slice(-4)\n\
//min10 = min10.slice(-4)\n\
//min1 = min1.slice(-4)\n\
//sec10 = sec10.slice(-4)\n\
//sec1 = sec1.slice(-4)\n\
hour10 = ("0000" + tensDigit(hours).toString(2)).slice(-4)\n\
hour1 = ("0000" + onesDigit(hours).toString(2)).slice(-4)\n\
min10 = ("0000" + tensDigit(minutes).toString(2)).slice(-4)\n\
min1 = ("0000" + onesDigit(minutes).toString(2)).slice(-4)\n\
sec10 = ("0000" + tensDigit(seconds).toString(2)).slice(-4)\n\
sec1 = ("0000" + onesDigit(seconds).toString(2)).slice(-4)\n\
}\n\
\n\
\n\
function drawDot (digit, onColor, offColor, step) {\n\
if (digit == 1) {\n\
color( onColor)\n\
} else {\n\
color( offColor)\n\
}\n\
dot ()\n\
forward (step)\n\
}\n\
\n\
\n\
function drawNumberDots (digitString, onColor, offColor, spacing) {\n\
drawDot( digitString[0], onColor, offColor, spacing)\n\
drawDot( digitString[1], onColor, offColor, spacing)\n\
drawDot( digitString[2], onColor, offColor, spacing)\n\
drawDot( digitString[3], onColor, offColor, spacing)\n\
backward (60)\n\
}\n\
\n\
\n\
function displayBinaryDots(hSpacing, vSpacing) {\n\
bottom = vSpacing * 1.5\n\
leftSide = -hSpacing * 2.5\n\
penup()\n\
goto (leftSide + hSpacing *0, bottom)\n\
drawNumberDots (hour10, hourColor, offColor, vSpacing)\n\
\n\
goto (leftSide + hSpacing *1, bottom)\n\
drawNumberDots (hour1, hourColor, offColor, vSpacing)\n\
\n\
goto (leftSide + hSpacing *2, bottom)\n\
drawNumberDots (min10, minuteColor, offColor, vSpacing)\n\
\n\
goto (leftSide + hSpacing *3, bottom)\n\
drawNumberDots (min1, minuteColor, offColor, vSpacing)\n\
\n\
goto (leftSide + hSpacing *4, bottom)\n\
drawNumberDots (sec10, secondColor, offColor, vSpacing)\n\
\n\
goto (leftSide + hSpacing *5, bottom)\n\
drawNumberDots (sec1, secondColor, offColor, vSpacing)\n\
}\n\
\n\
\n\
function displayTime() {\n\
clear()\n\
angle(180)\n\
spacing = Math.min(maxX(), maxY()) *1.8/6\n\
hSpacing = spacing\n\
vSpacing = spacing\n\
width (spacing/10)\n\
hideturtle()\n\
getBinaryTime()\n\
displayBinaryDots(hSpacing, vSpacing)\n\
}\n\
\n\
demo = displayTime\n\
animate(displayTime, 1000)\n\
'
clock_digital ='\
// Clock, Digital -- digital clock using seven-segment displays\n\
\n\
//*** GLOBALS ***\n\
\n\
var hour1digit;\n\
var hour10digit;\n\
var min1digit;\n\
var min10digit;\n\
var sec10digit;\n\
var sec1digit;\n\
\n\
var segSize;\n\
var horizontalElements\n\
var digitSpacing\n\
var interdigitSpacing\n\
var segWidth\n\
var segAngle = 10 // degrees\n\
var segOnColor = "red"\n\
var segOffColor = "black"\n\
\n\
\n\
//*** CONSTANTS ***\n\
\n\
/*\n\
The seven-segment display is layed out as follows:\n\
--a--\n\
| |\n\
f b\n\
| |\n\
--g--\n\
| |\n\
e c\n\
| |\n\
--d--\n\
*/\n\
//segment strings are in the order: abcdefg\n\
// where 1 turns segment on\n\
// and 0 turns segment off\n\
var segments = [ "1111110", //0\n\
"0110000", //1\n\
"1101101", //2\n\
"1111--1", //3\n\
"0110011", //4\n\
"1011011", //5\n\
"1011111", //6\n\
"1110000", //7\n\
"1111111", //8\n\
"1110011" //9\n\
]\n\
\n\
\n\
//*** FUNCTIONS ***\n\
\n\
function tensDigit (number) {\n\
return Math.floor (number/10) % 10\n\
}\n\
\n\
\n\
function onesDigit (number) {\n\
return Math.floor (number % 10)\n\
}\n\
\n\
\n\
function getTime() {\n\
time = new Date\n\
hours = time.getHours()\n\
minutes = time.getMinutes()\n\
seconds = time.getSeconds()\n\
\n\
// extract the digits\n\
hour10digit = tensDigit(hours)\n\
hour1digit = onesDigit(hours)\n\
min10digit = tensDigit(minutes)\n\
min1digit = onesDigit(minutes)\n\
sec10digit = tensDigit(seconds)\n\
sec1digit = onesDigit(seconds)\n\
}\n\
\n\
\n\
function segColor (bit) {\n\
if (bit == "1") {\n\
color( segOnColor)\n\
} else {\n\
color( segOffColor)\n\
}10\n\
}\n\
\n\
\n\
function display7segment(digit) {\n\
pendown()\n\
segColor (segments [digit].substr(0,1)) //a\n\
forward (segSize)\n\
right(90+segAngle)\n\
segColor (segments [digit].substr(1,1)) //b\n\
forward (segSize)\n\
segColor (segments [digit].substr(2,1)) //c\n\
forward (segSize)\n\
right (90-segAngle)\n\
segColor (segments [digit].substr(3,1)) //d\n\
forward (segSize)\n\
right (90+segAngle)\n\
segColor (segments [digit].substr(4,1)) //e\n\
forward (segSize)\n\
right (90-segAngle)\n\
segColor (segments [digit].substr(6,1)) //g\n\
forward (segSize)\n\
backward (segSize)\n\
left (90-segAngle)\n\
segColor (segments [digit].substr(5,1)) //f\n\
forward (segSize)\n\
right (90-segAngle)\n\
penup()\n\
}\n\
\n\
\n\
function displaySegTime() {\n\
// black out background\n\
goto (minX(),0)\n\
angle (90)\n\
color(black)\n\
width (2*maxY())\n\
pendown()\n\
forward(2*maxX())\n\
101010\n\
// draw the 6 digits of time\n\
goto (-horizontalElements/2*segSize, segSize)\n\
width (segWidth)\n\
display7segment(hour10digit)\n\
forward (digitSpacing)\n\
display7segment(hour1digit)\n\
\n\
forward (interdigitSpacing)\n\
display7segment(min10digit)\n\
forward (digitSpacing)\n\
display7segment(min1digit)\n\
\n\
forward (interdigitSpacing)\n\
display7segment(sec10digit)\n\
forward (digitSpacing)\n\
display7segment(sec1digit)\n\
}\n\
\n\
\n\
function displayTime() {\n\
horizontalElements = 6 + 3*.4 + 2*1.24\n\
segSize = Math.min (maxY(), 2* maxX()/horizontalElements) * .9\n\
digitSpacing = 1.4 * segSize\n\
interdigitSpacing = 2.24 * segSize\n\
segWidth = segSize/6\n\
hideturtle() \n\
getTime()\n\
displaySegTime()\n\
}\n\
\n\
//demo = displayTime\n\
animate(displayTime, 1000)\n\
'
clock ='\
// Clock, Analog -- draw and animate an analog clock\n\
\n\
//GLOBALS\n\
var size;\n\
\n\
//draw the tick marks around the edge of the clock\n\
function ticks(x, y, radius) {\n\
var tickLen = 7;\n\
var gap = radius - tickLen;\n\
color("blue");\n\
width(1);\n\
for (var theta = 0; theta < 360; theta = theta + 6) {\n\
// Thicken hour marks\n\
if (theta % 30 != 0) {\n\
width(1/130* size);\n\
} else {\n\
width(3/130* size);\n\
}\n\
penup();\n\
goto(0,0);\n\
angle(theta);\n\
forward(gap);\n\
pendown();\n\
forward(tickLen);\n\
}\n\
}\n\
\n\
\n\
// draw the hour numbers on the clock face\n\
function numbers(x, y, radius) {\n\
penup();\n\
fontSize = 20/130 * size\n\
setFont(fontSize+"px sans-serif");\n\
color("black");\n\
for (var hour = 1; hour <= 12; hour++) {\n\
goto(x,y);\n\
angle(hour * 30);\n\
forward(radius); // to center of digit\n\
angle(180);\n\
forward(10/130 * size); // vertical correction to baseline\n\
right(90);\n\
if (hour < 10) {\n\
forward(6/130 * size); // horizontal correction to lower left corner\n\
} else {\n\
forward (10/130 * size)\n\
}\n\
right(180);\n\
write(hour);\n\
}\n\
pendown();\n\
}\n\
\n\
// draw one of the clock hands\n\
function hand (theta, w, length, col) {\n\
var stepSize = 5;\n\
var widthDelta = w / (length / stepSize);\n\
goto(0, 0);\n\
angle(theta);\n\
color(col);\n\
for (var step = 0; step < length; step = step + stepSize) {\n\
width(w);\n\
forward(stepSize);\n\
w = w - widthDelta;\n\
}\n\
}\n\
\n\
function hands(hours, minutes, seconds) {\n\
// draw seconds hand\n\
var secDegreesPerSecond = 6; // = 360 degrees/60 seconds /minute\n\
hand(seconds * secDegreesPerSecond, 4, 100/130 * size, "red");\n\
// draw minutes hand \n\
var minDegreePerSecond = 0.1; // = 360 degrees /3600 seconds /hour\n\
var minutesInSeconds = minutes * 60 + seconds;\n\
hand(minutesInSeconds * minDegreePerSecond, 10, 100/130 * size, "blue");\n\
// draw hours hand\n\
var hourDegreePerSecond = .1/12; // = 360 degrees /3600 seconds per hour /12 hours per half day /half day\n\
var hoursInSeconds = ((hours % 12) * 3600) + minutesInSeconds;\n\
hand(hoursInSeconds * hourDegreePerSecond, 10, 60/130 * size, "blue");\n\
}\n\
\n\
// refresh the entire clock\n\
function clock() {\n\
clear();\n\
size = .9 * Math.min( maxX(), maxY())\n\
numbers(0, 0, 110/130 * size);\n\
color("lightgreen");\n\
goto (0,0);\n\
width(1/130* size)\n\
circle(130/130 * size );\n\
ticks(0, 0, 130/130 * size );\n\
var d = new Date();\n\
hands(d.getHours(), d.getMinutes(), d.getSeconds());\n\
}\n\
\n\
function demo() {\n\
hideTurtle();\n\
// refresh the clock every second\n\
animate(clock,1000);\n\
}\n\
'
collidescape ='\
// Collidescape (tm) -- aperiodic tiling researched by Ward Hollins.\n\
// angles for the two isosceles triangles are: \n\
// 36, 72, 72 and 36, 36, 108 ..degrees\n\
// 1,2,2 and 1,1,3 times pi/5 .. radians\n\
ang = 360/10 // the basic angle (pi/5 radians)\n\
side = 50 // length of the common side of the isosceles triangles\n\
bBase = 2* side * Math.cos( degToRad( ang)) // length of big base\n\
sBase = 2* side * Math.sin( degToRad( ang/2)) // length of small base\n\
\n\
\n\
function bb (fColor) { //big piece, big angle\n\
beginShape()\n\
forward( side)\n\
right( 4 * ang)\n\
forward( bBase)\n\
right( 4 * ang)\n\
forward( side)\n\
right( 180)\n\
fillShape( fColor)\n\
}\n\
\n\
\n\
function bs (fColor) { // big piece, small angle\n\
beginShape()\n\
forward( side)\n\
right( 2 * ang)\n\
forward( side)\n\
right( 4 * ang)\n\
forward( bBase)\n\
right( 180)\n\
fillShape( fColor)\n\
}\n\
\n\
\n\
function bs2 (fColor) { // big piece, small angle other corner\n\
beginShape()\n\
forward( bBase)\n\
right( 4 * ang)\n\
forward( side)\n\
right( 2 * ang)\n\
forward( side)\n\
right( 180)\n\
fillShape( fColor)\n\
}\n\
\n\
\n\
function ss (fColor) { // small piece, small angle\n\
beginShape()\n\
forward( side)\n\
right( 3 * ang)\n\
forward( sBase)\n\
right( 3 * ang)\n\
forward( side)\n\
right( 180)\n\
fillShape( fColor)\n\
}\n\
\n\
\n\
function sb (fColor) { // small piece, big angle\n\
beginShape()\n\
forward( sBase)\n\
right( 3 * ang)\n\
forward( side)\n\
right( 4 * ang)\n\
forward( side)\n\
right( 180)\n\
fillShape( fColor)\n\
}\n\
\n\
\n\
function sb2 (fColor) { // small piece, big angle other corner\n\
beginShape()\n\
forward( side)\n\
right( 4 * ang)\n\
forward( side)\n\
right( 3 * ang)\n\
forward( sBase)\n\
right( 180)\n\
fillShape( fColor)\n\
}\n\
\n\
\n\
function spiral( ) {\n\
// function draws a spiral using only two isosceles triangles\n\
// this is done with a series of points. Each point starts at the\n\
// center of the spiral and moves to the point where several triangles\n\
// are drawn. This technique isolates changes, but is less efficient\n\
// overall.\n\
//\n\
// Numbers for each point can be included by uncommenting the "//write"\n\
// statements.\n\
\n\
c1 = "yellow"\n\
c2 = "blue"\n\
for (var i=0; i<5; i++) {\n\
//point0:\n\
goto(0,0)\n\
setHeading( (i * 2 + 1) * ang)\n\
bs( c2)\n\
\n\
//point1:\n\
penup()\n\
goto(0,0)\n\
setHeading( (i * 2 + 1) * ang)\n\
forward( bBase)\n\
pendown()\n\
\n\
bs( c2)\n\
bs( c2)\n\