)
}
}
)
(
}
{
)
)
(
)
(
(
{
}
)
(
)
}
)
)
{
(
(
)
)
}
)
(
}
AboutAll PostsWarningRandom

Make a Debugging Dot

  1. function dot(x, y, radius, color) {
  2.   const el = document.createElement('div');
  3.   const size = `${radius * 2}px`;
  4.   Object.assign(el.style, {
  5.     position: 'absolute', 
  6.     left: `${x}px`,
  7.     top: `${y}px`,
  8.     width: size,
  9.     height: size,
  10.     transform: `translate(${-radius}px, ${-radius}px)`,
  11.     borderRadius: '50%',
  12.     background: color
  13.   });
  14.   el.classList.add('dot');
  15.   document.body.appendChild(el);
  16.   return el;
  17. }
  18.  
  19. dot(100, 100, 10, 'red');
  20. dot(200, 100, 5, 'blue');
  21.  
  22. for (let i = 0; i < 20; i++) {
  23.   dot(20 + i * 12, 200, 5, `hsl(${i * 10}deg, 60%, 50%)`)
  24. }

Draw a dot – good for visualizing things when doing animation and positioning logic.

// css // graphics // javascript // tricks

Draw a Spiral with Resize

  1. const canvas = document.body.appendChild(
  2.   document.createElement('canvas')
  3. );
  4. const c = canvas.getContext('2d');
  5.  
  6. function resize() {
  7.   canvas.width = window.innerWidth;
  8.   canvas.height = window.innerHeight;
  9.   draw();
  10. }
  11.  
  12. function draw() {
  13.   c.clearRect(0, 0, canvas.width, canvas.height);
  14.   c.fillStyle = 'blue';
  15.  
  16.   const iter = 300,
  17.         halfWidth = window.innerWidth / 2,
  18.         halfHeight = window.innerHeight / 2;
  19.   let rad = 0, theta = 0, x, y;
  20.   for (let i = 0; i < iter; i++) {
  21.     x = halfWidth + rad * Math.cos(theta);
  22.     y = halfHeight + rad * Math.sin(theta);
  23.     c.fillRect(x, y, 5, 5);
  24.     rad += Math.min(window.innerWidth, window.innerHeight) * 0.0015;
  25.     theta += .1;
  26.   }
  27. }
  28.  
  29. resize();
  30. window.addEventListener('resize', resize);

Expanding on yesterdays post, this draws a resizable sprial on a canvas.

// canvas // graphics // javascript // math

Semi-golfed Canvas Setup

  1. ((
  2.   width = 200, height = 200, 
  3.   cnv = document.body.appendChild(
  4.     Object.assign(
  5.       document.createElement('canvas'), {
  6.       width, height
  7.     })
  8.   ),
  9.   c = cnv.getContext('2d'), 
  10.   f = c.fillRect.bind(c),
  11.   C = _ => c.fillStyle = _) => {
  12.  
  13.   C`gray`; f(0, 0, width, height);
  14.   C`blue`; f(10, 10, 100, 20);
  15. })();
// canvas // golfed // graphics // javascript
Newer Posts

Recent

Archive

RSS
snippet.zone ~ 2021-24 /// {s/z}