Wall clock
Plot your own stopped clock with an accuracy of +/- 6 hrs.
Reload or adjust the sliders for more shapes.
Log in to post a comment.
// LL 2021
const hours = -1; // min=-1 max=11 step=1
const minutes = -1; // min=-1 max=59 step=1
const seconds = -1; // min=-1 max=59 step=1
const draw_seconds = 2; // min=0 max=2 step=1 (Yes, No, Maybe)
const shape = 0; // min=0 max=8 step=1
const animation = 0; // min=0 max=1 step=0.01
const turtle = new Turtle();
var polygons = null;
var animated_seconds = seconds;
const scale = 90;
var case_sides = [ 3, 4, 4, 5, 6, 9, 12, 100 ];
var tick_scale = [ 0.85, 0.98, 0.98, 1, 1, 1, 1, 1 ];
var hand_scale = [ 0.5, 0.7, 0.7, 0.8, 0.85, 0.95, 1, 1 ];
const shape_to_draw = (shape > 0) ? (shape-1) : Math.floor(Math.random() * case_sides.length);
const hours_to_draw = (hours >= 0) ? hours : Math.floor(Math.random() * 12);
const minutes_to_draw = (minutes >= 0) ? minutes : Math.floor(Math.random() * 60);
const seconds_to_draw = (seconds >= 0) ? seconds : Math.floor(Math.random() * 60);
Canvas.setpenopacity(.75);
function getCirclePoints(radius, steps) {
const start_angle = -Math.PI / ((shape_to_draw != 1) ? 2 : 4);
return Array.from( {length: steps}, (_, id) => (
[ Math.cos(id / steps * Math.PI*2 + start_angle) * radius, Math.sin(id / steps * Math.PI*2 + start_angle) * radius ]
));
}
function getLength(x, y) {
return Math.sqrt(x*x + y*y);
}
function getTickAngle(t) {
return t / 60 * Math.PI * 2 - Math.PI / 2;
}
function getTickScaling(t) {
const steps = 60 / case_sides[shape_to_draw];
const toffset = (shape_to_draw != 1) ? 0 : (60 / 2 / case_sides[shape_to_draw]);
const t0 = Math.floor(((t+toffset)) / steps) * steps - toffset;
const t1 = t0 + steps;
const dt = (t - t0) / steps;
const x0 = Math.cos(getTickAngle(t0));
const y0 = Math.sin(getTickAngle(t0));
const x1 = Math.cos(getTickAngle(t1));
const y1 = Math.sin(getTickAngle(t1));
const xt = x0 + (x1 - x0) * dt;
const yt = y0 + (y1 - y0) * dt;
return getLength(xt, yt);
}
function getTickPoints(t) {
const radius_scale = getTickScaling(t);
const radius_out = 0.85 * tick_scale[shape_to_draw] * scale * radius_scale;
const radius_in1 = 0.80 * tick_scale[shape_to_draw] * scale * radius_scale;
const radius_in2 = 0.75 * tick_scale[shape_to_draw] * scale * radius_scale;
const angle = getTickAngle(t);
const radius_in = ((t % 5) == 0) ? radius_in2 : radius_in1;
var points = [];
const angle_offset = 0.01;
points.push( [ Math.cos(angle + angle_offset) * radius_in, Math.sin(angle + angle_offset) * radius_in ] );
points.push( [ Math.cos(angle + angle_offset) * radius_out, Math.sin(angle + angle_offset) * radius_out ] );
points.push( [ Math.cos(angle - angle_offset) * radius_out, Math.sin(angle - angle_offset) * radius_out ] );
points.push( [ Math.cos(angle - angle_offset) * radius_in, Math.sin(angle - angle_offset) * radius_in ] );
return points;
}
function drawTicks() {
for (var t=0; t<60; t++) {
var points = getTickPoints(t);
const p1 = polygons.create();
p1.addPoints(...points);
p1.addOutline();
p1.addHatching(t / 60 * Math.PI * 2, .6);
polygons.draw(turtle, p1, true);
}
}
function drawCircle(radius, steps, shadow, hatching=false) {
const points = getCirclePoints(radius * scale, steps);
const p1 = polygons.create();
p1.addPoints(...points);
p1.addOutline();
if (hatching) p1.addHatching(Math.PI/4, 1);
polygons.draw(turtle, p1, true);
if (shadow !== undefined) {
const p2 = polygons.create();
p2.addPoints(...points.map(p => [p[0]+shadow[0], p[1]+shadow[1]]));
p2.addHatching(-Math.PI/4, .5);
polygons.draw(turtle, p2, false);
}
}
function drawHand(value, thickness, length, shadow, hatching=false) {
const start_angle = -Math.PI/2 + value * Math.PI*2;
const points = Array.from( {length: 4}, (_, id) => {
var radius = thickness;
if (id==0) radius = length * hand_scale[shape_to_draw];
if (id==2) radius *= 3;
radius *= scale;
return [ Math.cos(start_angle + id / 4 * Math.PI*2) * radius, Math.sin(start_angle + id / 4 * Math.PI*2) * radius ];
});
const p1 = polygons.create();
p1.addPoints(...points);
if (hatching) p1.addHatching(Math.PI/4, 1);
p1.addOutline();
polygons.draw(turtle, p1, true);
if (shadow !== undefined) {
const p2 = polygons.create();
p2.addPoints(...points.map(p => [p[0]+shadow[0], p[1]+shadow[1]]));
p2.addHatching(-Math.PI/4, .5);
polygons.draw(turtle, p2, false);
}
}
function drawCase() {
drawCircle(0.9, case_sides[shape_to_draw], undefined, false);
drawCircle(0.98, case_sides[shape_to_draw], [2, 3], true);
}
function drawCenter() { drawCircle(0.05, 20, [0.5, 0.5], true); }
function drawHourHand() {
const hour_value = hours_to_draw / 12 + minutes_to_draw / 60 / 12 + animated_seconds / 60 / 60 / 12;
drawHand(hour_value, 0.045, 0.5, [1, 1]);
}
function drawMinuteHand() {
const minute_value = minutes_to_draw / 60 + animated_seconds / 60 / 60;
drawHand(minute_value, 0.045, 0.84, [1, 1]);
}
function drawSecondHand() {
if (draw_seconds == 1) return;
if (draw_seconds == 2 && Math.random() < 0.5) return;
const second_value = animated_seconds / 60;
drawHand(second_value, 0.025, 0.84, [1, 1], true);
}
function walk(i, t) {
animated_seconds = seconds_to_draw + 12 * 60 * 60 * (t+animation);
if (i ==0) polygons = new Polygons();
var index = 0;
if (false) {}
else if (i == index++) drawCenter();
else if (i == index++) drawSecondHand();
else if (i == index++) drawMinuteHand();
else if (i == index++) drawHourHand();
else if (i == index++) drawTicks();
else if (i == index++) drawCase();
else return false;
return true;
}
// Adapted from:
// Transforms. Created by Reinder Nijhoff 2019 - @reindernijhoff
// The MIT License
// https://turtletoy.net/turtle/a5befa1f8d
//
////////////////////////////////////////////////////////////////
// Polygon Clipping utility code - Created by Reinder Nijhoff 2019
// https://turtletoy.net/turtle/a5befa1f8d
////////////////////////////////////////////////////////////////
function Polygons() {
const polygonList = [];
const Polygon = class {
constructor() {
this.cp = []; // clip path: array of [x,y] pairs
this.dp = []; // 2d lines [x0,y0],[x1,y1] to draw
this.aabb = []; // AABB bounding box
}
addPoints(...points) {
// add point to clip path and update bounding box
let xmin = 1e5, xmax = -1e5, ymin = 1e5, ymax = -1e5;
(this.cp = [...this.cp, ...points]).forEach( p => {
xmin = Math.min(xmin, p[0]), xmax = Math.max(xmax, p[0]);
ymin = Math.min(ymin, p[1]), ymax = Math.max(ymax, p[1]);
});
this.aabb = [(xmin+xmax)/2, (ymin+ymax)/2, (xmax-xmin)/2, (ymax-ymin)/2];
}
addSegments(...points) {
// add segments (each a pair of points)
points.forEach(p => this.dp.push(p));
}
addOutline() {
for (let i = 0, l = this.cp.length; i < l; i++) {
this.dp.push(this.cp[i], this.cp[(i + 1) % l]);
}
}
draw(t) {
for (let i = 0, l = this.dp.length; i < l; i+=2) {
t.jump(this.dp[i]), t.goto(this.dp[i + 1]);
}
}
addHatching(a, d) {
const tp = new Polygon();
tp.cp.push([-1e5,-1e5],[1e5,-1e5],[1e5,1e5],[-1e5,1e5]);
const dx = Math.sin(a) * d, dy = Math.cos(a) * d;
const cx = Math.sin(a) * 200, cy = Math.cos(a) * 200;
for (let i = 0.5; i < 150 / d; i++) {
tp.dp.push([dx * i + cy, dy * i - cx], [dx * i - cy, dy * i + cx]);
tp.dp.push([-dx * i + cy, -dy * i - cx], [-dx * i - cy, -dy * i + cx]);
}
tp.boolean(this, false);
this.dp = [...this.dp, ...tp.dp];
}
inside(p) {
let int = 0; // find number of i ntersection points from p to far away
for (let i = 0, l = this.cp.length; i < l; i++) {
if (this.segment_intersect(p, [0.1, -1000], this.cp[i], this.cp[(i + 1) % l])) {
int++;
}
}
return int & 1; // if even your outside
}
boolean(p, diff = true) {
// bouding box optimization by ge1doot.
if (Math.abs(this.aabb[0] - p.aabb[0]) - (p.aabb[2] + this.aabb[2]) >= 0 &&
Math.abs(this.aabb[1] - p.aabb[1]) - (p.aabb[3] + this.aabb[3]) >= 0) return this.dp.length > 0;
// polygon diff algorithm (narrow phase)
const ndp = [];
for (let i = 0, l = this.dp.length; i < l; i+=2) {
const ls0 = this.dp[i];
const ls1 = this.dp[i + 1];
// find all intersections with clip path
const int = [];
for (let j = 0, cl = p.cp.length; j < cl; j++) {
const pint = this.segment_intersect(ls0, ls1, p.cp[j], p.cp[(j + 1) % cl]);
if (pint !== false) {
int.push(pint);
}
}
if (int.length === 0) {
// 0 intersections, inside or outside?
if (diff === !p.inside(ls0)) {
ndp.push(ls0, ls1);
}
} else {
int.push(ls0, ls1);
// order intersection points on line ls.p1 to ls.p2
const cmpx = ls1[0] - ls0[0];
const cmpy = ls1[1] - ls0[1];
int.sort( (a,b) => (a[0] - ls0[0]) * cmpx + (a[1] - ls0[1]) * cmpy -
(b[0] - ls0[0]) * cmpx - (b[1] - ls0[1]) * cmpy);
for (let j = 0; j < int.length - 1; j++) {
if ((int[j][0] - int[j+1][0])**2 + (int[j][1] - int[j+1][1])**2 >= 0.001) {
if (diff === !p.inside([(int[j][0]+int[j+1][0])/2,(int[j][1]+int[j+1][1])/2])) {
ndp.push(int[j], int[j+1]);
}
}
}
}
}
return (this.dp = ndp).length > 0;
}
//port of http://paulbourke.net/geometry/pointlineplane/Helpers.cs
segment_intersect(l1p1, l1p2, l2p1, l2p2) {
const d = (l2p2[1] - l2p1[1]) * (l1p2[0] - l1p1[0]) - (l2p2[0] - l2p1[0]) * (l1p2[1] - l1p1[1]);
if (d === 0) return false;
const n_a = (l2p2[0] - l2p1[0]) * (l1p1[1] - l2p1[1]) - (l2p2[1] - l2p1[1]) * (l1p1[0] - l2p1[0]);
const n_b = (l1p2[0] - l1p1[0]) * (l1p1[1] - l2p1[1]) - (l1p2[1] - l1p1[1]) * (l1p1[0] - l2p1[0]);
const ua = n_a / d;
const ub = n_b / d;
if (ua >= 0 && ua <= 1 && ub >= 0 && ub <= 1) {
return [l1p1[0] + ua * (l1p2[0] - l1p1[0]), l1p1[1] + ua * (l1p2[1] - l1p1[1])];
}
return false;
}
};
return {
list: () => polygonList,
create: () => new Polygon(),
draw: (turtle, p, addToVisList=true) => {
for (let j = 0; j < polygonList.length && p.boolean(polygonList[j]); j++);
p.draw(turtle);
if (addToVisList) polygonList.push(p);
}
};
}