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optional homework: implementation in p5.js (2 illusions): #7

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optional homework: implementation in p5.js:
aldrodriguezca Mar 7, 2017
cc9bed9
modified frame rate to improve illusion perception
aldrodriguezca Mar 15, 2017
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2 changes: 2 additions & 0 deletions index.html
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Expand Up @@ -49,6 +49,8 @@
<script src="sketches/color_gradient.js"></script>
<script src="sketches/whites.js"></script>
<script src="sketches/watercolor.js"></script>
<script src="sketches/reverse_spoke.js"></script>
<script src="sketches/checker.js"></script>
<script src="sketches/poggendorff.js"></script>
<script src="lib/js/head.min.js"></script>
<script src="js/reveal.js"></script>
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Empty file added npm-debug.log.3884792172
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119 changes: 119 additions & 0 deletions sketches/checker.js
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@@ -0,0 +1,119 @@
//Author: Alvaro Rodriguez
//March 7th 2017

//Implementado desde 0
var c = 0;

var sketch8 = function( p ){
var n = 10;
p.setup = function(){
var myCanvas = p.createCanvas(400, 400);
p.background(192,255,255);
};

p.draw = function(){

//Draw matriz (green squares)
p.background(192,255,255);
var n = 10;
for(var j = 0; j < 10; j++){
for(var i = 0; i < 10; i++){
p.fill(0,255,0);
p.noStroke();
if(j %2 == 0 && i % 2 == 0)
p.rect(i*40,j*40,40,40);
else if(j % 2 != 0 && i %2 !=0)
p.rect(i*40,j*40,40,40);
}
}

if(!p.mouseIsPressed){
var k;
var c = 1;

for(var i = n-1; i >=1; i--){
k = i;
for(var j = 1; j <= n-i; j++){
if(i == 9 || i == 8 || i == 6 || i == 3 || i == 1){
p.fill(255,255,255);
p.noStroke();

p.triangle((k*40),(j*40)-9,(k*40)-4.5,(j*40)-4.5,(k*40)+4.5,(j*40)-4.5);
p.triangle((k*40),(j*40),(k*40)-4.5,(j*40)-4.5,(k*40)+4.5,(j*40)-4.5);

p.triangle((k*40),(j*40)+9,(k*40)-4.5,(j*40)+4.5,(k*40)+4.5,(j*40)+4.5);
p.triangle((k*40),(j*40),(k*40)-4.5,(j*40)+4.5,(k*40)+4.5,(j*40)+4.5);

p.fill(0);
p.triangle((k*40)-9,(j*40),(k*40)-4.5,(j*40)-4.5,(k*40)-4.5,(j*40)+4.5);
p.triangle((k*40),(j*40),(k*40)-4.5,(j*40)-4.5,(k*40)-4.5,(j*40)+4.5);

p.triangle((k*40)+9,(j*40),(k*40)+4.5,(j*40)-4.5,(k*40)+4.5,(j*40)+4.5);
p.triangle((k*40),(j*40),(k*40)+4.5,(j*40)-4.5,(k*40)+4.5,(j*40)+4.5);
}
else{
p.fill(0);
p.noStroke();
p.triangle((k*40),(j*40)-9,(k*40)-4.5,(j*40)-4.5,(k*40)+4.5,(j*40)-4.5);
p.triangle((k*40),(j*40),(k*40)-4.5,(j*40)-4.5,(k*40)+4.5,(j*40)-4.5);

p.triangle((k*40),(j*40)+9,(k*40)-4.5,(j*40)+4.5,(k*40)+4.5,(j*40)+4.5);
p.triangle((k*40),(j*40),(k*40)-4.5,(j*40)+4.5,(k*40)+4.5,(j*40)+4.5);

p.fill(255,255,255);
p.triangle((k*40)-9,(j*40),(k*40)-4.5,(j*40)-4.5,(k*40)-4.5,(j*40)+4.5);
p.triangle((k*40),(j*40),(k*40)-4.5,(j*40)-4.5,(k*40)-4.5,(j*40)+4.5);

p.triangle((k*40)+9,(j*40),(k*40)+4.5,(j*40)-4.5,(k*40)+4.5,(j*40)+4.5);
p.triangle((k*40),(j*40),(k*40)+4.5,(j*40)-4.5,(k*40)+4.5,(j*40)+4.5);
}
k++;
c++;
}
}

for(var i = 2; i <= n-1; i++){
k = i;
for(var j = 1; j <= n-i; j++){
if(i == 2 || i == 4 || i == 7 || i == 9){
p.fill(255,255,255);
p.noStroke();
p.triangle((j*40),(k*40)-9,(j*40)-4.5,(k*40)-4.5,(j*40)+4.5,(k*40)-4.5);
p.triangle((j*40),(k*40),(j*40)-4.5,(k*40)-4.5,(j*40)+4.5,(k*40)-4.5);

p.triangle((j*40),(k*40)+9,(j*40)-4.5,(k*40)+4.5,(j*40)+4.5,(k*40)+4.5);
p.triangle((j*40),(k*40),(j*40)-4.5,(k*40)+4.5,(j*40)+4.5,(k*40)+4.5);

p.fill(0);
p.triangle((j*40)-9,(k*40),(j*40)-4.5,(k*40)-4.5,(j*40)-4.5,(k*40)+4.5);
p.triangle((j*40),(k*40),(j*40)-4.5,(k*40)-4.5,(j*40)-4.5,(k*40)+4.5);

p.triangle((j*40)+9,(k*40),(j*40)+4.5,(k*40)-4.5,(j*40)+4.5,(k*40)+4.5);
p.triangle((j*40),(k*40),(j*40)+4.5,(k*40)-4.5,(j*40)+4.5,(k*40)+4.5);
}else{
p.fill(0);
p.noStroke();
p.triangle((j*40),(k*40)-9,(j*40)-4.5,(k*40)-4.5,(j*40)+4.5,(k*40)-4.5);
p.triangle((j*40),(k*40),(j*40)-4.5,(k*40)-4.5,(j*40)+4.5,(k*40)-4.5);

p.triangle((j*40),(k*40)+9,(j*40)-4.5,(k*40)+4.5,(j*40)+4.5,(k*40)+4.5);
p.triangle((j*40),(k*40),(j*40)-4.5,(k*40)+4.5,(j*40)+4.5,(k*40)+4.5);

p.fill(255,255,255);
p.triangle((j*40)-9,(k*40),(j*40)-4.5,(k*40)-4.5,(j*40)-4.5,(k*40)+4.5);
p.triangle((j*40),(k*40),(j*40)-4.5,(k*40)-4.5,(j*40)-4.5,(k*40)+4.5);

p.triangle((j*40)+9,(k*40),(j*40)+4.5,(k*40)-4.5,(j*40)+4.5,(k*40)+4.5);
p.triangle((j*40),(k*40),(j*40)+4.5,(k*40)-4.5,(j*40)+4.5,(k*40)+4.5);
}
k++;
}
}
}


};

}

var myp5_8 = new p5(sketch8, 'checker_id');
58 changes: 58 additions & 0 deletions sketches/reverse_spoke.js
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//Author: Alvaro Rodriguez
//March 4th 2017

//Implementado desde 0
var c = 0;
var sketch6 = function( p ){
p.setup = function(){
var myCanvas = p.createCanvas(700, 400);
p.background(191,191,191);
p.frameRate(50);
};

p.draw = function(){

p.stroke(0);



p.ellipse(350,200, 350,350);
p.fill(0);
p.ellipse(350,200, 10,10);


var q = c;

for(var i = 0; i <= 2*p.PI; i += p.QUARTER_PI/2){
p.fill(q);
p.stroke(127,127,127);
p.strokeWeight(3);
p.arc(350,200, 350, 350, i, i+p.QUARTER_PI/2, p.PIE);
q+=15;
//}
q = q%255;
}

if(!p.mouseIsPressed){

p.ellipse(350,200, 350,350);
p.fill(0);
p.ellipse(350,200, 10,10);
p.noFill();

for(var i = 0; i <= 2*p.PI; i += p.QUARTER_PI/2){
p.fill(c);
p.stroke(127,127,127);
p.strokeWeight(3);
p.arc(350,200, 350, 350, i, i+p.QUARTER_PI/2, p.PIE);
c+=15;
//}
c = c%255;
}

}
};

}

var myp5_6 = new p5(sketch6, 'reverse_spoke_illusion_id');
11 changes: 9 additions & 2 deletions source.md
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Expand Up @@ -645,6 +645,13 @@ V:

## Optical Illusions (others)

<div id='reverse_spoke_illusion_id'></div>
<a target="_blank" href="http://www.michaelbach.de/ot/mot-spokes/index.html">Reverse Spoke Illusion</a>

V:

## Optical Illusions (others)

<figure>
<img height='400' src='fig/Motion_illusion_in_star_arrangement.png'/>
<figcaption>Movement illusions</figcaption>
Expand All @@ -664,8 +671,8 @@ V:
## Optical Illusions (others)

<figure>
<img height='400' src='fig/checker.gif'/>
<figcaption>Checker</figcaption>
<div id='checker_id'></div>
<a target="_blank" href="http://www.anopticalillusion.com/2012/11/checkerboard-twisted-cord-illusion/">Checker</a>
</figure>

V:
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