animate/Catalogue/nodal expanding.html

101 lines
2.8 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 = 30;
let time = 600;
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();
let colour1 = [137, 54, 255];
let colour2 = [158, 255, 54];
Draw_nodal_expanding(5, 100000, rotation * 2 + 33000,0, colour1, colour2, 0.5, 2)
// Draw_nodal_expanding(5, 10000, rotation, 0, colour1, colour2, 1, 2)
console.log(rotation)
}, 1000 / fps);
rotation += deg_per_sec / fps; // was = j = angle, now = rotation
currentFrame += 1; // was = i
}
}
render();
function Draw_nodal_expanding(expand, points, step, rotate, colour1, colour2, colour_change, line_width) {
var angle = 360 / points * step
var start_angle = angle;
var done = false;
var total_moves = 1;
var length = expand;
for (let z = 1; z <= 100; z++) { //why specifically 2500
ctx.beginPath();
ncolour = LerpRGB(colour1, colour2, Math.cos(rad(z * colour_change)));
ctx.moveTo(centerX + (Math.cos(rad(angle * (z - 1) + rotate)) * (length - expand)), centerY + (Math.sin(rad(angle * (z - 1) + rotate)) * (length - expand)));
ctx.lineTo(centerX + (Math.cos(rad(angle * z + rotate)) * length), centerY + (Math.sin(rad(angle * z + rotate)) * length));
length += expand;
ctx.lineWidth = line_width;//try 1
ctx.strokeStyle = colourToText(ncolour);
ctx.stroke();
}
}
function LerpRGB(a, b, t) {
if (t < 0) {
t *= -1;
}
var newColor = [0, 0, 0];
newColor[0] = a[0] + (b[0] - a[0]) * t;
newColor[1] = a[1] + (b[1] - a[1]) * t;
newColor[2] = a[2] + (b[2] - a[2]) * t;
return newColor;
}
function colourToText(colour) {
return "rgb(" + colour[0] + "," + colour[1] + "," + colour[2] + ")"
}
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>