A Pen By
Lionel Radisson

` ````
<script src="https://cdn.rawgit.com/ironwallaby/delaunay/master/delaunay.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.3/p5.min.js"></script>
```

` ````
*{
margin: 0;
padding: 0;
}
canvas{
position:absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}
```

` ````
var BLUE, RED;
var tris;
function setup(){
createCanvas( windowWidth, windowHeight );
BLUE = color( '#1E2630' );
RED = color( '#FB3550' );
initializeTriangulation();
}
function initializeTriangulation(){
tris = [];
var pts = [];
// push canvas rect points
pts.push( createVector( 0, 0 ) );
pts.push( createVector( width, 0 ) );
pts.push( createVector( width, height ) );
pts.push( createVector( 0, height ) );
// add a certain nb of pts proportionally to the size of the canvas
// ~~ truncates a floating point number and keeps the integer part, like floor()
var n = ~~ ( width / 300 * height / 300 );
for( var i = 0; i < n; i ++ ){
pts.push( createVector( ~~ random( width ), ~~ random( height ) ) );
}
// Now, let's use Delaunay.js
// Delaunay.triangulate expect a list of vertices (which should be a bunch of two-element arrays, representing 2D Euclidean points)
// and it will return you a giant array, arranged in triplets, representing triangles by indices into the passed array
// Array.map function let us create an Array of 2 elements arrays [ [x,y],[x,y],..] from our array of PVector [ PVector(x,y), PVector(x,y), ... ]
var triangulation = Delaunay.triangulate( pts.map( function( pt ){
return [ pt.x, pt.y ];
} ) );
// create Triangles object using indices returned by Delaunay.triangulate
for( var i = 0; i < triangulation.length; i += 3 ){
tris.push( new Triangle(
pts[ triangulation[ i ] ],
pts[ triangulation[ i + 1 ] ],
pts[ triangulation[ i + 2 ] ]
) );
}
}
// class for keeping triangles from 3 PVectors
function Triangle( _a, _b, _c ){
// PVectors
this.a = _a;
this.b = _b;
this.c = _c;
// used for fill using lerpColor
this.r = random(0.8);
// used for drawing lines on triangles
// number of lines to draw proportionnally to the triangle size
this.n = ~~( dist(
_a.x, _a.y,
( this.b.x + this.c.x ) / 2, ( this.b.y + this.c.y ) / 2
) / random( 25, 50 ) ) + 1 ;
// direction point for the lines
this.drawTo = ~~ random( 3 );
this.draw = function(){
noStroke();
fill( lerpColor( RED, BLUE, this.r ) );
triangle( this.a.x, this.a.y, this.b.x, this.b.y, this.c.x, this.c.y );
switch( this.drawTo ){
case 0:
this.drawLines( this.a, this.b, this.c );
break;
case 1:
this.drawLines( this.c, this.a, this.b );
break;
case 2:
this.drawLines( this.b, this.a, this.c );
break;
}
stroke( BLUE );
strokeJoin( BEVEL );
strokeWeight( 15 );
noFill();
triangle( this.a.x, this.a.y, this.b.x, this.b.y, this.c.x, this.c.y );
};
this.drawLines = function( from, to1, to2 ){
var c = cos( frameCount / 360 * TWO_PI ) / 2;
for( var i = 1; i <= this.n ; i++ ){
var p1 = createVector(
lerp( from.x, to1.x, ( i - 1 ) / this.n ),
lerp( from.y, to1.y, ( i - 1 ) / this.n )
);
var p2 = createVector(
lerp( from.x, to2.x, ( i - 1 ) / this.n ),
lerp( from.y, to2.y, ( i - 1 ) / this.n )
);
var p3 = createVector(
lerp( from.x, to2.x, ( i - 0.5 + c ) / this.n ),
lerp( from.y, to2.y, ( i - 0.5 + c ) / this.n )
);
var p4 = createVector(
lerp( from.x, to1.x, ( i - 0.5 + c ) / this.n ),
lerp( from.y, to1.y, ( i - 0.5 + c ) / this.n )
);
// line( p1.x, p1.y, p2.x, p2.y );
noStroke();
fill( BLUE );
quad( p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, p4.x, p4.y );
}
}
}
function draw(){
background( RED );
tris.forEach( t => t.draw() );
if( frameCount % 720 == 0 ) initializeTriangulation();
}
function mousePressed(){
initializeTriangulation();
}
function windowResized(){
resizeCanvas( windowWidth, windowHeight );
initializeTriangulation();
}
```

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