141 lines
5.1 KiB
HTML
141 lines
5.1 KiB
HTML
<!DOCTYPE html>
|
|
<html>
|
|
<!-- ahhh -->
|
|
|
|
<body style="margin:0;">
|
|
<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 = 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();
|
|
|
|
DrawSquareTwist_width(7,400,0,rotation,"red")
|
|
// DrawSquareTwist_angle(3,400,0,rotation,"red")
|
|
|
|
}, 1000 / fps);
|
|
rotation += deg_per_sec / fps; // was = j = innerRotation, now = rotation
|
|
currentFrame += 1; // was = i
|
|
}
|
|
}
|
|
|
|
render();
|
|
|
|
|
|
function DrawSquareTwist_angle(sides,width, rotation,innerRotation, colour){
|
|
let out_angle = innerRotation;
|
|
// let widthMultiplier = 169 / (239 * Math.sin(Math.PI / 180 * (135 - out_angle + 90 * Math.floor(out_angle / 90))))
|
|
// let widthMultiplier = Math.sqrt(0.5) * 1/ (Math.sin(Math.PI / 180 * (135 - out_angle + 90 * Math.floor(out_angle / 90))))
|
|
let widthMultiplier = Math.sqrt(0.5) * 1/ (Math.sin(Math.PI / 180 * (135 - out_angle + 90 * Math.floor(out_angle / 90))))
|
|
|
|
for (let i = 0; i < 25; i++) {
|
|
DrawPolygon(sides,width*widthMultiplier**i,innerRotation*i, colour)
|
|
}
|
|
|
|
}
|
|
function DrawSquareTwist_width(sides,width, rotation,innerRotation, colour){
|
|
// if(innerRotation >59){
|
|
// innerRotation=59
|
|
// }
|
|
|
|
let out_angle = 0
|
|
let innerAngle = 180 - ((sides-2) *180/sides);
|
|
// console.log(innerAngle);
|
|
let scopeAngle = innerRotation - (innerAngle*Math.floor(innerRotation/innerAngle));
|
|
|
|
|
|
|
|
if (scopeAngle < innerAngle/2) {
|
|
out_angle = innerAngle / (2 * Math.cos((2*Math.PI*scopeAngle)/(3*innerAngle))) - innerAngle/2
|
|
}
|
|
else {
|
|
out_angle = -innerAngle / (2 * Math.cos( ((2*Math.PI)/3) - ((2*Math.PI*scopeAngle)/(3*innerAngle))) ) + (innerAngle*3)/2
|
|
}
|
|
let minWidth = Math.sin(rad(innerAngle/2))*(0.5/Math.tan(rad(innerAngle/2)))*2;
|
|
console.log(minWidth);
|
|
// let widthMultiplier = 169 / (239 * Math.sin(Math.PI / 180 * (135 - out_angle + 90 * Math.floor(out_angle / 90))))
|
|
// let widthMultiplier = Math.sqrt(0.5) * 1/ (Math.sin(Math.PI / 180 * (((innerAngle/2)*3) - out_angle + innerAngle * Math.floor(out_angle / innerAngle))))
|
|
|
|
// let widthMultiplier = 1 / (2 * Math.sin(Math.PI / 180 * (150 - out_angle + 120 * Math.floor(out_angle / 120)))) //triangle
|
|
let widthMultiplier = minWidth / Math.sin(Math.PI / 180 * (90+innerAngle/2 - out_angle + innerAngle * Math.floor(out_angle / innerAngle))) //triangle
|
|
console.log(innerRotation + ": " + out_angle);
|
|
for (let i = 0; i < 25; i++) {
|
|
DrawPolygon(sides,width*widthMultiplier**i,out_angle*i, colour)
|
|
// draw_triangle(180+out_angle*i,width*widthMultiplier**i, colour)
|
|
}
|
|
|
|
}
|
|
function DrawPolygon(sides, width, rotation, colour) {
|
|
ctx.beginPath();
|
|
ctx.moveTo(centerX + width * Math.cos(((rotation*4)*Math.PI/180) / sides), centerY + width * Math.sin(((rotation*4)*Math.PI/180) / sides));
|
|
|
|
for (var i = 1; i <= sides; i += 1) {
|
|
ctx.lineTo(
|
|
centerX + width * Math.cos((i * 2 * Math.PI +((rotation*4)*Math.PI/180)) / sides),
|
|
centerY + width * Math.sin((i * 2 * Math.PI +((rotation*4)*Math.PI/180)) / sides)
|
|
);
|
|
}
|
|
|
|
ctx.strokeStyle = colour;
|
|
ctx.lineWidth = 1;
|
|
ctx.stroke();
|
|
}
|
|
|
|
|
|
function drawSquare(angle,size, colour) {
|
|
ctx.save();
|
|
ctx.translate(centerX, centerY)//-(Math.sin(rad(angle)) *centerX));
|
|
ctx.rotate(rad(angle + 180));
|
|
ctx.beginPath();
|
|
ctx.strokeStyle = colour;
|
|
ctx.rect(-size/2, -size/2, size, size);
|
|
ctx.stroke();
|
|
ctx.restore();
|
|
}
|
|
|
|
function draw_triangle(ang, radius, colour) {
|
|
ctx.beginPath();
|
|
ctx.moveTo(centerX + Math.cos(rad(90 + 120 * 1 + ang)) * radius, centerY + Math.sin(rad(90 + 120 * 1 + ang)) * radius);
|
|
ctx.lineTo(centerX + Math.cos(rad(90 + 120 * 2 + ang)) * radius, centerY + Math.sin(rad(90 + 120 * 2 + ang)) * radius);
|
|
ctx.lineTo(centerX + Math.cos(rad(90 + 120 * 3 + ang)) * radius, centerY + Math.sin(rad(90 + 120 * 3 + ang)) * radius);
|
|
ctx.lineTo(centerX + Math.cos(rad(90 + 120 * 1 + ang)) * radius, centerY + Math.sin(rad(90 + 120 * 1 + ang)) * 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> |