Example 1 - Lime Triangle on Red background

// Example 1 - Lime Triangle on Red background

function setup() {

  // canvas size of 640 by 480 with red background 
  createCanvas(640, 480);
  background('red');

  // stroke of blue with weight of 8, and fill of lime
  stroke('blue');
  strokeWeight(8);
  fill('lime');
  
  // triangle with points of 3 vertices
  triangle(50, 50, 640-50, 50, 640-50, 480-50);
}

Output: