https://jayspacewebsite.web.app/sub-des/mercury/code.js

1var g = document.getElementById("canvas-gravity")
2var gtx = g.getContext("2d");
3
4var simGoing = 0;
5function gravitySimulation(grav) {
6    if (simGoing == 0) {
7        simGoing = 1
8        var x = g.width/2-  15;
9        var y = 10;
10        var gravity = grav/5;
11        var vol = 0;
12        const update = setInterval(updateGravity, 30);
13        
14        function updateGravity() {
15            gtx.fillStyle = "white"
16            gtx.fillRect(0, 0, g.width, g.height)
17            gtx.fillStyle = "red"
18            gtx.fillRect(x, y, 30, 20);
19
20            vol += gravity;
21            if (y+vol > g.height - 10) {
22                clearInterval(update)
23                gtx.fillStyle = "white"
24                gtx.fillRect(0, 0, g.width, g.height)
25                gtx.fillStyle = "red"
26                gtx.fillRect(x, g.height-20, 30, 20);
27                simGoing = 0;
28            } else {
29                y += vol;
30            }
31        }
32    }
33}
34
35let slideIndex = 1;
36showSlides(slideIndex);
37
38// Next/previous controls
39function plusSlides(n) {
40  showSlides(slideIndex += n);
41}
42
43// Thumbnail image controls
44function currentSlide(n) {
45  showSlides(slideIndex = n);
46}
47
48function showSlides(n) {
49  let i;
50  let slides = document.getElementsByClassName("mySlides");
51  let dots = document.getElementsByClassName("dot");
52  if (n > slides.length) {slideIndex = 1}
53  if (n < 1) {slideIndex = slides.length}
54  for (i = 0; i < slides.length; i++) {
55    slides[i].style.display = "none";
56  }
57  for (i = 0; i < dots.length; i++) {
58    dots[i].className = dots[i].className.replace(" active", "");
59  }
60  slides[slideIndex-1].style.display = "block";
61  dots[slideIndex-1].className += " active";
62}