Vertex

index.html

<script src="https://cdn.jsdelivr.net/npm/p5@0.10.2/lib/p5.js"></script>
<script src="https://cdn.jsdelivr.net/gh/georgesb/lib/drawGrid.js"></script>
<script src="script.js"></script>

script.js

 function setup() {
     createCanvas(650, 450);
     drawGrid();
     let c = color(255, 204, 0);
     fill(c);
     stroke('black');
}
 
function draw() {
      beginShape();
      vertex(50, 50);
      vertex(50, 300);
      vertex(250, 300);
      vertex(350,250);
      vertex(250, 200);
      vertex(150, 200);
      vertex(150, 50);
      endShape(CLOSE);
 }

thumbnail.png