animate/Catalogue/nodal.html

88 lines
2.1 KiB
HTML

<!DOCTYPE html>
<html>
<!-- ahhh -->
<body style="margin:0;overflow: hidden;">
<canvas id="myCanvas" width="10" height="10" style="display: block;box-sizing: border-box;">
Your browser does not support the HTML5 canvas tag.</canvas>
<script>
let c = document.getElementById("myCanvas");
let ctx = c.getContext("2d");
ctx.canvas.width = window.innerWidth;
ctx.canvas.height = window.innerHeight;
let deg_per_sec = 15;
let time = 120;
let fps = 60;
centerX = ctx.canvas.width / 2;
centerY = ctx.canvas.height / 2;
rotation = 0; //was = j = angle
currentFrame = 0; //was = i
function render() {
if (currentFrame < time / (1 / fps)) {
setTimeout(() => {
render();
render_clear();
Draw_nodal(300, 100, 31, rotation, "blue");
// Draw_center(); //Debugging
// DrawBorder();
}, 1000 / fps);
rotation += deg_per_sec / fps; // was = j = angle, now = rotation
currentFrame += 1; // was = i
}
}
render();
function Draw_nodal(radius, points, step, rotate, colour) {
var angle = 360 / points * step
ctx.beginPath();
var start_angle = angle;
var done = false;
var total_moves = 1;
ctx.moveTo(centerX + (Math.cos(rad(angle + rotate)) * radius), centerY + (Math.sin(rad(angle + rotate)) * radius));
while (done != true) {
if ((total_moves * step) % points != 0) {
total_moves++
}
else {
total_moves++
done = true
}
}
for (let z = 1; z <= total_moves; z++) {
ctx.lineTo(centerX + (Math.cos(rad(angle * z + rotate)) * radius), centerY + (Math.sin(rad(angle * z + rotate)) * radius));
}
ctx.strokeStyle = colour;
ctx.stroke();
}
function rad(degrees) {
var pi = Math.PI;
return degrees * (pi / 180);
}
function render_clear() {
ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
ctx.fillStyle = "black";
ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
}
</script>
</body>
</html>