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graphics_test.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Space Graphics?</title>
<style>
body {
display: flex;
justify-content: center;
/* width: 100%; */
}
canvas {
border: 3px solid black;
margin: 20px;
}
</style>
</head>
<body>
<canvas id="c">
</canvas>
<script>
'use strict';
/** @type {HTMLCanvasElement} */
const c = document.getElementById('c');
const ctx = c.getContext('2d');
const width = 500;
const height = 500;
c.width = width;
c.height = height;
function lerp(start, end, x) {
return start + Math.max(0, Math.min(1, x)) * (end - start)
}
function render1() {
ctx.clearRect(0, 0, width, height);
const NUM = 30;
for(let i = 0; i < NUM; ++i) {
ctx.save();
ctx.translate(
Math.sin(new Date() / 250 + i / NUM * Math.PI * 2) * 5,
i * 100 / NUM + Math.sin(new Date() / 300 + i / NUM * Math.PI * 2) * 5
);
ctx.beginPath();
ctx.moveTo(250, 50);
ctx.lineTo(50, 300);
ctx.lineTo(450, 300);
ctx.closePath();
ctx.stroke();
ctx.fillStyle = '#FFF';
ctx.fill();
ctx.restore();
}
requestAnimationFrame(render);
}
function triangle(x) {
return 2 * Math.abs(x - Math.floor(x + 1/2));
}
function render2() {
ctx.clearRect(0, 0, width, height);
const NUM = 30;
for(let x = 50; x <= 450; x += 0.5) {
const xx = x / 3;
const y = Math.sin(xx) * 10 + Math.sin(xx / 2.1) * 6 + 14 * triangle(xx / 3 + (new Date() / 1300)) + 28 * triangle(xx / 4 - (new Date() / 2000));
ctx.fillRect(x, 250 - y / 4, 3, 3);
}
requestAnimationFrame(render2);
}
function render3() {
ctx.clearRect(0, 0, width, height);
function f(x) {
let xx = x / 3;
return Math.sin(xx) * 10 + Math.sin(xx / 2.1) * 6 + 14 * Math.sin(xx / 3 + (new Date() / 1300)) + 28 * Math.sin(xx / 4 - (new Date() / 2000));
// return Math.sin(xx) * 500;
}
let x_offset = 0;
const centre_x = 250;
const centre_y = 250;
function line(x, y, dx, dy, join_to_0) {
let length = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));
for(let t = 0; t < 1; t += 1e-3) {
const x_minus_c = lerp(x, x + dx, t) - centre_x;
const y_minus_c = lerp(y, y + dy, t) - centre_y;
const length_from_c = Math.sqrt(x_minus_c * x_minus_c + y_minus_c * y_minus_c);
let perturbation = f(t * length + x_offset) * 0.25;
if(join_to_0) {
perturbation = lerp(perturbation, f((t - 1) * length) * 0.25, t);
}
ctx.fillRect(
lerp(x, x + dx, t) + perturbation * x_minus_c / length_from_c,
lerp(y, y + dy, t) + perturbation * y_minus_c / length_from_c,
3, 3
);
}
x_offset += length;
}
line(100, 100, 300, 0); // -> (400, 100)
line(400, 100, 0, 300); // -> (400, 100)
line(400, 400, -300, 0); // -> (400, 100)
line(100, 400, 0, -300, true); // -> (400, 100)
requestAnimationFrame(render3);
}
function render4() {
ctx.fillStyle = 'black';
ctx.fillRect(0, 0, width, height);
function f(x) {
let xx = x / 3;
return 0.25 * (
10 * Math.sin(xx)
+ 6 * Math.sin(xx / 2.1)
+ 14 * Math.sin(xx / 3 + (new Date() / 800))
+ 28 * Math.sin(xx / 4 - (new Date() / 2100))
+ 3 * Math.sin(xx / 5 - (new Date() / 600))
);
}
let x_offset = 0;
const centre_x = 250;
const centre_y = 250;
function line(from_x, from_y, to_x, to_y, final_line) {
let length = Math.sqrt(Math.pow(from_x - to_x, 2) + Math.pow(from_y - to_y, 2));
for(let t = 0; t <= 1; t += 1 / length * 3) {
const x_minus_c = lerp(from_x, to_x, t) - centre_x;
const y_minus_c = lerp(from_y, to_y, t) - centre_y;
const length_from_c = Math.sqrt(x_minus_c * x_minus_c + y_minus_c * y_minus_c);
let perturbation = f(t * length + x_offset);
if(final_line) {
perturbation = lerp(perturbation, f((t - 1) * length), t);
}
const x_pos = lerp(from_x, to_x, t) + perturbation * x_minus_c / length_from_c;
const y_pos = lerp(from_y, to_y, t) + perturbation * y_minus_c / length_from_c;
if(t == 0 && x_offset == 0) {
ctx.moveTo(x_pos, y_pos);
} else {
ctx.lineTo(x_pos, y_pos);
}
}
x_offset += length;
}
// for(let i = 0; i < 5; i++) {
x_offset = 0;
ctx.beginPath();
line(100, 100, 400, 100);
line(400, 100, 400, 400);
line(400, 400, 100, 400);
line(100, 400, 100, 100, true);
ctx.closePath();
ctx.fillStyle = '#fc6f03';
ctx.fill();
ctx.lineWidth = 5;
ctx.strokeStyle = '#f7a260';
ctx.stroke();
// }
requestAnimationFrame(render4);
}
{
const particles5 = [];
let last_particle5 = 0;
function render5() {
ctx.fillStyle = '#111';
ctx.fillRect(0, 0, width, height);
const time_now = new Date();
for(let i = 0; i < 2e3; ++i) {
const offset = i ** 4.7;
const x = offset * 1.9 % 500;
const y = offset % 501;
ctx.beginPath();
const r = offset % 6 * Math.sin(i + (new Date()) / 1000) ** 2
ctx.arc(x, y, r / 4, 0, Math.PI * 2);
const c = Math.floor(42 * r);
ctx.fillStyle = `rgba(${c}, ${c}, ${c}, ${c})`;
ctx.fill();
}
particles5.forEach(p => {
const r = lerp(1, 5, (time_now - p.t) / 1100);
ctx.fillStyle = `rgb(210, ${lerp(50, 120, (time_now - p.t) / 1500)}, 0)`;
ctx.beginPath();
ctx.arc(p.x - Math.pow((time_now - p.t) / 50, 1.3), p.y, r, 0, Math.PI * 2);
ctx.fill();
});
ctx.save();
ctx.translate(250, 250);
ctx.fillStyle = '#EEE';
ctx.beginPath();
ctx.moveTo(0, -10);
ctx.lineTo(10, 0);
ctx.lineTo(0, 10);
ctx.lineTo(-15, 10);
ctx.lineTo(-10, 5);
ctx.lineTo(-10, -5);
ctx.lineTo(-15, -10);
ctx.lineTo(0, -10);
ctx.closePath();
ctx.fill();
ctx.restore();
if(new Date() - last_particle5 > 400) {
particles5.push({t: time_now, x: -15 + 250, y: 10 + 250});
particles5.push({t: time_now, x: -15 + 250, y: -10 + 250});
last_particle5 = time_now;
}
requestAnimationFrame(render5);
}
window.render5 = render5;
}
{
const particles6 = [];
let last_particle6 = 0;
function render6() {
ctx.fillStyle = '#111';
ctx.fillRect(0, 0, width, height);
const time_now = new Date();
for(let i = 0; i < 2e3; ++i) {
const offset = i ** 4.7;
const x = offset * 1.9 % 500;
const y = offset % 501;
ctx.beginPath();
const r = offset % 6 * Math.sin(i + (new Date()) / 1000) ** 2
ctx.arc(x, y, r / 4, 0, Math.PI * 2);
const c = Math.floor(42 * r);
ctx.fillStyle = `rgba(${c}, ${c}, ${c}, ${c})`;
ctx.fill();
}
particles6.forEach(p => {
const r = lerp(1, 5, (time_now - p.t) / 1100);
ctx.fillStyle = `rgb(210, ${lerp(50, 120, (time_now - p.t) / 1500)}, 0)`;
ctx.beginPath();
ctx.arc(p.x - Math.pow((time_now - p.t) / 50, 1.3), p.y, r, 0, Math.PI * 2);
ctx.fill();
});
ctx.save();
ctx.translate(250, 250);
ctx.fillStyle = '#EEE';
ctx.beginPath();
ctx.moveTo(0, -10);
ctx.lineTo(10, 0);
ctx.lineTo(0, 10);
ctx.lineTo(-15, 10);
ctx.lineTo(-10, 5);
ctx.lineTo(-10, -5);
ctx.lineTo(-15, -10);
ctx.lineTo(0, -10);
ctx.closePath();
ctx.fill();
ctx.restore();
if(new Date() - last_particle6 > 400) {
particles6.push({t: time_now, x: -15 + 250, y: 10 + 250});
particles6.push({t: time_now, x: -15 + 250, y: -10 + 250});
last_particle6 = time_now;
}
function f(x) {
let xx = x / 3;
return 0.15 * (
10 * Math.sin(xx)
+ 6 * Math.sin(xx / 2.1)
+ 14 * Math.sin(xx / 3 + (new Date() / 800))
+ 28 * Math.sin(xx / 4 - (new Date() / 2100))
+ 3 * Math.sin(xx / 5 - (new Date() / 600))
);
}
let x_offset = 0;
const centre_x = 350;
const centre_y = 350;
function line(from_x, from_y, to_x, to_y, final_line) {
let length = Math.sqrt(Math.pow(from_x - to_x, 2) + Math.pow(from_y - to_y, 2));
for(let t = 0; t <= 1; t += 1 / length * 3) {
const x_minus_c = lerp(from_x, to_x, t) - centre_x;
const y_minus_c = lerp(from_y, to_y, t) - centre_y;
const length_from_c = Math.sqrt(x_minus_c * x_minus_c + y_minus_c * y_minus_c);
let perturbation = f(t * length + x_offset);
if(final_line) {
perturbation = lerp(perturbation, f((t - 1) * length), t);
}
const x_pos = lerp(from_x, to_x, t) + perturbation * x_minus_c / length_from_c;
const y_pos = lerp(from_y, to_y, t) + perturbation * y_minus_c / length_from_c;
if(t == 0 && x_offset == 0) {
ctx.moveTo(x_pos, y_pos);
} else {
ctx.lineTo(x_pos, y_pos);
}
}
x_offset += length;
}
x_offset = 0;
ctx.beginPath();
line(300, 300, 300, 400);
line(300, 400, 400, 400);
line(400, 400, 400, 300);
line(400, 300, 300, 300, true);
ctx.closePath();
ctx.fillStyle = '#fc6f03';
ctx.fill();
ctx.lineWidth = 5;
ctx.strokeStyle = '#f7a260';
ctx.stroke();
requestAnimationFrame(render6);
}
// Meteorite?
window.render6 = render6;
}
render6();
</script>
</body>
</html>