I want to make a very simple function in my jQuery script. When the finger/cursor touches/clicks on the screen, I want the pages to slide horizontally following the movements of the finger/cursor. I know there is a lot of plugins created by so many people, but I really don't need everybody else's solutions. The image is a visual view of how my HTML looks like. it is really simple.
The jQuery sciprt is obviously not correct, but I hope it would give you an idea about the simple function I need. I don't extra classes or fade-functions or anything.
$(document).live('touchmove' or 'mousemove', function() {
$('div[class=page_*], div[class=page_^]').[follow movements horizontally, and auto align to nearest edge when let go.];
});
Also I want to be able to do the same with one big div, so probably the width-variable of the element moving should be equal to $(window).width();. Actually I think that would be the best idea. I can always put more content inside the big div and make it larger, so keep it with that. It should be more simple to do and to focus on one element only.
So, here is my solution. I've made some changes so that now you can have more than 3 pages.
Also, I've defined a variable named threshold set to the half of a page. If you want to have a threshold bigger or smaller than the hakf of the page you will have to make some more changes.
HTML CODE:
<div class="container">
<div class="wrap">
<div class="page page1"></div>
<div class="page page2"></div>
<div class="page page3"></div>
<div class="page page4"></div>
</div>
</div>
CSS CODE:
.container, .page, .wrap {
width: 300px;
height: 400px;
}
.container {
background: #efefef;
box-shadow: 0px 0px 10px black;
overflow: hidden;
position: relative;
margin: 5px auto;
}
.wrap {
width: 1200px;
position: absolute;
top: 0;
left: 0;
}
.page {
float: left;
display: block;
-moz-user-select: none;
-khtml-user-select: none;
-webkit-user-select: none;
-o-user-select: none;
}
.page1 {
background: yellow;
}
.page2 {
background: green;
}
.page3 {
background: blue;
}
.page4 {
background: red;
}
As for the CSS code keep in mind that if you want to change the page size you will also have to change the container and wrap size.
JS CODE:
var mouseDown = false, right;
var xi, xf, leftX = 0;
var nPages = $(".page").size();
var pageSize = $(".page").width();
var threshold = pageSize/2;
var currentPage = 0;
$(".container").on("mousedown", function (e) {
mouseDown = true;
xi = e.pageX;
});
$(".container").on("mouseup", function (e) {
if (mouseDown) {
mouseDown = false;
xf = e.pageX;
leftX = parseInt($(".wrap").css("left").split("px")[0]);
if ((e.pageX - xi) < -threshold || (e.pageX - xi) > threshold) {
setFocusedPage();
} else {
restore();
}
}
});
$(".container").on("mouseleave", function (e) {
if (mouseDown) {
mouseDown = false;
xf = e.pageX;
leftX = parseInt($(".wrap").css("left").split("px")[0]);
if ((e.pageX - xi) < -threshold || (e.pageX - xi) > threshold) {
setFocusedPage();
} else {
restore();
}
}
});
$(".container").on("mousemove", function (e) {
if (mouseDown) {
$(".wrap").css({
"left": (leftX + (e.pageX - xi))
});
right = ((e.pageX - xi) < 0) ? true : false;
}
});
function restore() {
$(".wrap").stop().animate({
"left": -(currentPage * pageSize)
}, 200, function () {
leftX = parseInt($(".wrap").css("left").split("px")[0]);
});
}
function setFocusedPage() {
if (leftX >= (-threshold)) { // First Page
currentPage = 0;
} else if (leftX < (-threshold) && leftX >= (-(nPages + 1) * threshold)) { // Second to N-1 Page
(right) ? currentPage++ : currentPage--;
} else if (leftX < -((nPages + 1) * threshold)) { // Third Page
currentPage = nPages - 1;
}
$(".wrap").stop().animate({
"left": -(currentPage * pageSize)
}, 200, function () {
leftX = parseInt($(".wrap").css("left").split("px")[0]);
});
}
Remember here that if you want a different threshold you will have to make some changes especially in the setFocusedPage() function.
Here is my last DEMO
Related
I'm trying to make an Infinite marquee that speeds up on scroll, https://altsdigital.com/ you can see the effect on this website, the text says "Not your usual SEO agency" and when you scroll it speeds up.
Here's what I've tried but it does not work. It does not loop properly without overlapping (keep your eye on the left side of the page, you'll notice the text briefly overlaps and then translates left to create a gap) and I am unsure on how to fix it:
Here's the code (TEXT ONLY VISIBLE ON "FULL PAGE" view):
const lerp = (current, target, factor) => {
let holder = current * (1 - factor) + target * factor;
holder = parseFloat(holder).toFixed(3);
return holder;
};
class LoopingText {
constructor(DOMElements) {
this.DOMElements = DOMElements;
this.lerpingData = {
counterOne: { current: 0, target: 0 },
counterTwo: { current: 100, target: 100 },
};
this.interpolationFactor = 0.1;
this.speed = 0.2;
this.render();
this.onScroll();
}
onScroll() {
window.addEventListener("scroll", () => {
this.lerpingData["counterOne"].target += this.speed * 5;
this.lerpingData["counterTwo"].target += this.speed * 5;
});
}
lerp() {
for (const counter in this.lerpingData) {
this.lerpingData[counter].current = lerp(
this.lerpingData[counter].current,
this.lerpingData[counter].target,
this.interpolationFactor
);
}
this.lerpingData["counterOne"].target += this.speed;
this.lerpingData["counterTwo"].target += this.speed;
if (this.lerpingData["counterOne"].target < 100) {
this.DOMElements[0].style.transform = `translate(${this.lerpingData["counterOne"].current}%, 0%)`;
} else {
this.lerpingData["counterOne"].current = -100;
this.lerpingData["counterOne"].target = -100;
}
if (this.lerpingData["counterTwo"].target < 100) {
this.DOMElements[1].style.transform = `translate(${this.lerpingData["counterTwo"].current}%, 0%)`;
} else {
this.lerpingData["counterTwo"].current = -100;
this.lerpingData["counterTwo"].target = -100;
}
}
render() {
this.lerp();
window.requestAnimationFrame(() => this.render());
}
}
let textArray = document.getElementsByClassName("item");
new LoopingText(textArray);
#import url("https://fonts.googleapis.com/css2?family=Poppins:ital,wght#0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap");
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: "Poppins";
}
.hero-section {
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
overflow: hidden;
position: relative;
width: 100%;
}
.loop-container {
position: relative;
width: 100%;
display: flex;
/* padding-right: 24px; */
}
.item {
position: absolute;
font-size: 15rem;
white-space: nowrap;
margin: 0;
}
span {
transition: all 0.2s;
cursor: default;
}
.hover:hover {
color: gray;
transition: all 0.2s;
}
<body>
<section class="hero-section">
<div class="loop-container">
<div class="item">Infinite Horizontal Looping Text</div>
<div class="item">Infinite Horizontal Looping Text</div>
</div>
</section>
<section class="hero-section">
</section>
</body>
Your items are overlapping because you're not allowing any lerping diffing when the items should switch positions.
The current value should never equal the target value. If the values match, than the current value needs to catch up the target — giving that erratic movement and wrong calculations, additionally aggravated for the two sibling elements which should be perfectly in sync to give that immediate snap-back, perceived as a fluid continuous motion.
Solution
Instead of animating two (or more) children independently,animate only the parent .loop-container.
The container should be as wide as one child element exactly.
"Push" one child element to the far left using position: absolute; left: -100%
To allow the target value to be always greater than the current value:when the target value is greater than 100 — set current to the negative difference of the two values, and target to 0
Demo time:
const lerp = (current, target, factor) => current * (1 - factor) + target * factor;
class LoopingText {
constructor(el) {
this.el = el;
this.lerp = {current: 0, target: 0};
this.interpolationFactor = 0.1;
this.speed = 0.2;
this.direction = -1; // -1 (to-left), 1 (to-right)
// Init
this.el.style.cssText = `position: relative; display: inline-flex; white-space: nowrap;`;
this.el.children[1].style.cssText = `position: absolute; left: ${100 * -this.direction}%;`;
this.events();
this.render();
}
events() {
window.addEventListener("scroll", () => this.lerp.target += this.speed * 5);
}
animate() {
this.lerp.target += this.speed;
this.lerp.current = lerp(this.lerp.current, this.lerp.target, this.interpolationFactor);
if (this.lerp.target > 100) {
this.lerp.current -= this.lerp.target;
this.lerp.target = 0;
}
const x = this.lerp.current * this.direction;
this.el.style.transform = `translateX(${x}%)`;
}
render() {
this.animate();
window.requestAnimationFrame(() => this.render());
}
}
document.querySelectorAll(".loop-container").forEach(el => new LoopingText(el));
/* QuickReset */ * { margin: 0; box-sizing: border-box; }
body { min-height: 400vh; /* force some scrollbars */ }
.hero-section {
position: relative;
top: 50vh;
overflow: hidden;
font: 900 9vw/1 sans-serif;
min-height: 100vh;
}
<section class="hero-section">
<div class="loop-container">
<div class="item">Infinite Horizontal Looping Text </div>
<div class="item">Infinite Horizontal Looping Text </div>
</div>
</section>
PS:
When animating, (unless you want an element static / immovable) you should never put an elements transformations inside an if/else logic. The element should always receive the updated transformations. Put inside the conditional logic only the values that you actually want to modify (as I did in the example above).
I'm trying to make an Infinite marquee that speeds up on scroll, https://altsdigital.com/ you can see the effect on this website, the text says "Not your usual SEO agency" and when you scroll it speeds up.
Here's what I've tried but it does not work. It does not loop properly without overlapping (keep your eye on the left side of the page, you'll notice the text briefly overlaps and then translates left to create a gap) and I am unsure on how to fix it:
Here's the code (TEXT ONLY VISIBLE ON "FULL PAGE" view):
const lerp = (current, target, factor) => {
let holder = current * (1 - factor) + target * factor;
holder = parseFloat(holder).toFixed(3);
return holder;
};
class LoopingText {
constructor(DOMElements) {
this.DOMElements = DOMElements;
this.lerpingData = {
counterOne: { current: 0, target: 0 },
counterTwo: { current: 100, target: 100 },
};
this.interpolationFactor = 0.1;
this.speed = 0.2;
this.render();
this.onScroll();
}
onScroll() {
window.addEventListener("scroll", () => {
this.lerpingData["counterOne"].target += this.speed * 5;
this.lerpingData["counterTwo"].target += this.speed * 5;
});
}
lerp() {
for (const counter in this.lerpingData) {
this.lerpingData[counter].current = lerp(
this.lerpingData[counter].current,
this.lerpingData[counter].target,
this.interpolationFactor
);
}
this.lerpingData["counterOne"].target += this.speed;
this.lerpingData["counterTwo"].target += this.speed;
if (this.lerpingData["counterOne"].target < 100) {
this.DOMElements[0].style.transform = `translate(${this.lerpingData["counterOne"].current}%, 0%)`;
} else {
this.lerpingData["counterOne"].current = -100;
this.lerpingData["counterOne"].target = -100;
}
if (this.lerpingData["counterTwo"].target < 100) {
this.DOMElements[1].style.transform = `translate(${this.lerpingData["counterTwo"].current}%, 0%)`;
} else {
this.lerpingData["counterTwo"].current = -100;
this.lerpingData["counterTwo"].target = -100;
}
}
render() {
this.lerp();
window.requestAnimationFrame(() => this.render());
}
}
let textArray = document.getElementsByClassName("item");
new LoopingText(textArray);
#import url("https://fonts.googleapis.com/css2?family=Poppins:ital,wght#0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap");
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: "Poppins";
}
.hero-section {
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
overflow: hidden;
position: relative;
width: 100%;
}
.loop-container {
position: relative;
width: 100%;
display: flex;
/* padding-right: 24px; */
}
.item {
position: absolute;
font-size: 15rem;
white-space: nowrap;
margin: 0;
}
span {
transition: all 0.2s;
cursor: default;
}
.hover:hover {
color: gray;
transition: all 0.2s;
}
<body>
<section class="hero-section">
<div class="loop-container">
<div class="item">Infinite Horizontal Looping Text</div>
<div class="item">Infinite Horizontal Looping Text</div>
</div>
</section>
<section class="hero-section">
</section>
</body>
Your items are overlapping because you're not allowing any lerping diffing when the items should switch positions.
The current value should never equal the target value. If the values match, than the current value needs to catch up the target — giving that erratic movement and wrong calculations, additionally aggravated for the two sibling elements which should be perfectly in sync to give that immediate snap-back, perceived as a fluid continuous motion.
Solution
Instead of animating two (or more) children independently,animate only the parent .loop-container.
The container should be as wide as one child element exactly.
"Push" one child element to the far left using position: absolute; left: -100%
To allow the target value to be always greater than the current value:when the target value is greater than 100 — set current to the negative difference of the two values, and target to 0
Demo time:
const lerp = (current, target, factor) => current * (1 - factor) + target * factor;
class LoopingText {
constructor(el) {
this.el = el;
this.lerp = {current: 0, target: 0};
this.interpolationFactor = 0.1;
this.speed = 0.2;
this.direction = -1; // -1 (to-left), 1 (to-right)
// Init
this.el.style.cssText = `position: relative; display: inline-flex; white-space: nowrap;`;
this.el.children[1].style.cssText = `position: absolute; left: ${100 * -this.direction}%;`;
this.events();
this.render();
}
events() {
window.addEventListener("scroll", () => this.lerp.target += this.speed * 5);
}
animate() {
this.lerp.target += this.speed;
this.lerp.current = lerp(this.lerp.current, this.lerp.target, this.interpolationFactor);
if (this.lerp.target > 100) {
this.lerp.current -= this.lerp.target;
this.lerp.target = 0;
}
const x = this.lerp.current * this.direction;
this.el.style.transform = `translateX(${x}%)`;
}
render() {
this.animate();
window.requestAnimationFrame(() => this.render());
}
}
document.querySelectorAll(".loop-container").forEach(el => new LoopingText(el));
/* QuickReset */ * { margin: 0; box-sizing: border-box; }
body { min-height: 400vh; /* force some scrollbars */ }
.hero-section {
position: relative;
top: 50vh;
overflow: hidden;
font: 900 9vw/1 sans-serif;
min-height: 100vh;
}
<section class="hero-section">
<div class="loop-container">
<div class="item">Infinite Horizontal Looping Text </div>
<div class="item">Infinite Horizontal Looping Text </div>
</div>
</section>
PS:
When animating, (unless you want an element static / immovable) you should never put an elements transformations inside an if/else logic. The element should always receive the updated transformations. Put inside the conditional logic only the values that you actually want to modify (as I did in the example above).
My implementation,
http://kodhus.com/kodnest/land/PpNFTgp
I am curious, as I am not able for some reason to figure this out, how to get my JavaScript to make my slider behave more natural and smoother, if someone knows, how to, or can make this, feel free. I'd be happy to understand.
JavaScript:
const thumb = document.querySelector('.thumb');
const thumbIndicator = document.querySelector('.thumb .thumb-indicator');
const sliderContainer = document.querySelector('.slider-container');
const trackProgress = document.querySelector('.track-progress');
const sliderContainerStart = sliderContainer.offsetLeft;
const sliderContainerWidth = sliderContainer.offsetWidth;
var translate;
var dragging = false;
var percentage = 14;
document.addEventListener('mousedown', function(e) {
if (e.target.classList.contains('thumb-indicator')) {
dragging = true;
thumbIndicator.classList.add('focus');
}
});
document.addEventListener('mousemove', function(e) {
if (dragging) {
console.log('moving', e)
if (e.clientX < sliderContainerStart) {
translate = 0;
} else if (e.clientX > sliderContainerWidth + sliderContainerStart) {
translate = sliderContainerWidth;
} else {
translate = e.clientX - sliderContainer.offsetLeft;
}
thumb.style.transform = 'translate(-50%) translate(' + translate + 'px)';
trackProgress.style.transform = 'scaleX(' + translate / sliderContainerWidth + ')'
}
});
function setPercentage() {
thumb.style.transform = 'translate(-50%) translate(' + percentage/100 * sliderContainerWidth + 'px)';
trackProgress.style.transform = 'scaleX(' + percentage/100 + ')';
}
function init() {
setPercentage();
}
init();
document.addEventListener('mouseup', function(e) {
dragging = false;
thumbIndicator.classList.remove('focus');
});
EDIT: Is there a way to smoothly and naturally increment by one for every slow move?
Is it possible to make to behave as if, like when one clicks the progress bar so that it jumps there?
The kodhus site is very janky in my browser, so I can't tell if your code lacks responsiveness or whether it's the site itself. I feel that your code is a bit convoluted: translate and width / height are mixed unnecessarily; no need to use a dragging boolean when that information is always stored in the classlist. The following slider performs nicely, and has a few considerations I don't see in yours:
stopPropagation when clicking the .thumb element
drag stops if window loses focus
pointer-events: none; applied to every part of the slider but the .thumb element
let applySliderFeel = (slider, valueChangeCallback=()=>{}) => {
// Now `thumb`, `bar` and `slider` are the elements that concern us
let [ thumb, bar ] = [ '.thumb', '.bar' ].map(v => slider.querySelector(v));
let changed = amt => {
thumb.style.left = `${amt * 100}%`;
bar.style.width = `${amt * 100}%`;
valueChangeCallback(amt);
};
// Pressing down on `thumb` activates dragging
thumb.addEventListener('mousedown', evt => {
thumb.classList.add('active');
evt.preventDefault();
evt.stopPropagation();
});
// Releasing the mouse button (anywhere) deactivates dragging
document.addEventListener('mouseup', evt => thumb.classList.remove('active'));
// If the window loses focus dragging also stops - this can be a very
// nice quality of life improvement!
window.addEventListener('blur', evt => thumb.classList.remove('active'));
// Now we have to act when the mouse moves...
document.addEventListener('mousemove', evt => {
// If the drag isn't active do nothing!
if (!thumb.classList.contains('active')) return;
// Compute `xRelSlider`, which is the mouse position relative to the
// left side of the slider bar. Note that *client*X is compatible with
// getBounding*Client*Rect, and using these two values we can quickly
// get the relative x position.
let { width, left } = slider.getBoundingClientRect();
// Consider mouse x, subtract left offset of slider, and subtract half
// the width of the thumb (so drags position the center of the thumb,
// not its left side):
let xRelSlider = evt.clientX - left - (thumb.getBoundingClientRect().width >> 1);
// Clamp `xRelSlider` between 0 and the slider's width
if (xRelSlider < 0) xRelSlider = 0;
if (xRelSlider > width) xRelSlider = width;
// Apply styling (using percents is more robust!)
changed(xRelSlider / width);
evt.preventDefault();
evt.stopPropagation();
});
slider.addEventListener('mousedown', evt => {
let { width, left } = slider.getBoundingClientRect();
// Clicking the slider also activates a drag
thumb.classList.add('active');
// Consider mouse x, subtract left offset of slider, and subtract half
// the width of the thumb (so drags position the center of the thumb,
// not its left side):
let xRelSlider = evt.clientX - left - (thumb.getBoundingClientRect().width >> 1);
// Apply styling (using percents is more robust!)
changed(xRelSlider / width);
evt.preventDefault();
evt.stopPropagation();
});
changed(0);
};
let valElem = document.querySelector('.value');
applySliderFeel(document.querySelector('.slider'), amt => valElem.innerHTML = amt.toFixed(3));
.slider {
position: absolute;
width: 80%; height: 4px; background-color: rgba(0, 0, 0, 0.3);
left: 10%; top: 50%; margin-top: -2px;
}
.slider > .bar {
position: absolute;
left: 0; top: 0; width: 0; height: 100%;
background-color: #000;
pointer-events: none;
}
.slider > .thumb {
position: absolute;
width: 20px; height: 20px; background-color: #000; border-radius: 100%;
left: 0; top: 50%; margin-top: -10px;
}
.slider > .thumb.active {
box-shadow: 0 0 0 5px rgba(0, 0, 0, 0.5);
}
<div class="slider">
<div class="bar"></div>
<div class="thumb"></div>
</div>
<div class="value"></div>
Im working on a site right now with a scroll loop effect (when you reach the bottom of the page it seamlessly jumps back to the top creating an endless loop). Though I am having an issue trying implement an effect to rotate the individual div's based on their offsetTop.
Here is a fiddle link with the rotate effect working without the scroll loop effect-> https://jsfiddle.net/jacob_truax/bgrkewny/3/
Here is a link to a fiddle with both effects -> https://jsfiddle.net/jacob_truax/b1x4dow7/18/
As you can see in the second fiddle, adding the scroll loop effect while implementing the rotation effect breaks the code. Can someone help me figure this out please?
Here is the js for the broken fiddle
const sections = document.querySelectorAll("section")
const divTag = document.querySelector("div.Loop")
const mainTag = document.querySelector("main")
var doc = window.document,
clones = divTag.querySelectorAll('.is-clone'),
disableScroll = false,
scrollHeight = 0,
scrollPos = 0,
clonesHeight = 0,
i = 0;
const addMovement = function() {
const topViewport = divTag.offsetTop
const midViewport = topViewport + (divTag.offsetHeight / 2)
sections.forEach(section => {
const topSection = section.offsetTop
const midSection = topSection + (section.offsetHeight / 2)
const distanceToSection = (midViewport - midSection)
console.log(distanceToSection)
const image = section.querySelector(".info")
image.style.transform = `rotate(${distanceToSection}deg)`
})
}
addMovement()
function getScrollPos () {
return (divTag.offsetTop || divTag.scrollTop) - (divTag.clientTop || 0);
}
function setScrollPos (pos) {
divTag.scrollTop = pos;
}
function getClonesHeight () {
clonesHeight = 0;
for (i = 0; i < clones.length; i += 1) {
clonesHeight = clonesHeight + clones[i].offsetHeight;
}
return clonesHeight;
}
function reCalc () {
scrollPos = getScrollPos();
scrollHeight = divTag.scrollHeight;
clonesHeight = getClonesHeight();
if (scrollPos <= 0) {
setScrollPos(1); // Scroll 1 pixel to allow upwards scrolling
}
}
function scrollUpdate () {
if (!disableScroll) {
scrollPos = getScrollPos();
if (clonesHeight + scrollPos >= scrollHeight) {
// Scroll to the top when you’ve reached the bottom
setScrollPos(1); // Scroll down 1 pixel to allow upwards scrolling
disableScroll = true;
} else if (scrollPos <= 0) {
// Scroll to the bottom when you reach the top
setScrollPos(scrollHeight - clonesHeight);
disableScroll = true;
}
}
if (disableScroll) {
// Disable scroll-jumping for a short time to avoid flickering
window.setTimeout(function () {
disableScroll = false;
}, 40);
}
}
function init () {
reCalc();
divTag.addEventListener('scroll', function () {
window.requestAnimationFrame(scrollUpdate);
addMovement()
}, false);
window.addEventListener('resize', function () {
window.requestAnimationFrame(reCalc);
addMovement()
}, false);
}
if (document.readyState !== 'loading') {
init()
} else {
doc.addEventListener('DOMContentLoaded', init, false)
}
Here is the css
html,
body {
height: 100%;
/* overflow: hidden; */
}
body {
color: #000;
}
main {
height: 100%;
position: relative;
top: 0;
left: 0;
}
header {
position: fixed;
top: 0;
left: 0;
width: 100%;
text-align: center;
z-index: 1;
}
.Loop {
position: absolute;
height: 100%;
overflow: auto;
}
section {
position: relative;
display: flex;
flex-direction: row;
align-items: center;
justify-content: center;
width: 100vw;
height: 100vh;
}
::scrollbar {
display: none;
}
section div {
position: absolute;
z-index: 2;
text-align: center;
width: 50%;
background-color: #ff0000;
}
section img {
position: relative;
width: 50%;
background-color: #000;
}
The offsetTop property returns the top position (in pixels) relative
to the top of the offsetParent element.
Changing line #14 to use scrollTop instead works:
const topViewport = divTag.scrollTop;
Note: I've asked this question again because I was not be able to edit my old question. (No idea if this was a SO bug or a bug with my beta safari.)
So I want to generate a joystick, as it is used in many games. The joystick stands out of a background and a movable billet. The billet may only be moved within the background.
Here you can find both images
let background = new Image()
let stick = new Image()
let enableMaxDistance = false
background.onload = function() {
$(this).css({
position: "absolute",
left: "2%",
bottom: "2%",
width: "30%"
}).appendTo(document.body)
}
stick.onload = function() {
$(this).css({
position: "absolute",
left: "2%",
bottom: "2%",
width: "30%"
}).appendTo(document.body)
let zeroPosition = $(this).offset()
$(this).draggable({
drag: function(e, ui) {
let distance = Math.sqrt(Math.pow(zeroPosition.top - $(this).offset().top, 2) + Math.pow(zeroPosition.left - $(this).offset().left, 2));
if (distance > 60 && enableMaxDistance) {
e.preventDefault();
}
},
scroll: false
})
}
background.src = "https://i.stack.imgur.com/5My6q.png"
stick.src = "https://i.stack.imgur.com/YEoJ4.png"
html, body {
overflow: hidden;
height: 100%;
}
input {
margin-top: 10%;
margin-left: 50%;
}
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.min.js"></script>
<input onclick="enableMaxDistance = !enableMaxDistance " value="toggle maximum distance" type="button"/>
But while implementing this joystick some problems occurred:
My idea was to make the stick maneuverable by using jqueryUI and to calculate its distance to the origin with each drag event. If the distance is too large, the event will be stopped (not executed) using e.preventDefault();. --> If the distance in the frame, the stick is wearable.
The problem is that ...
The stick is no longer draggable after moving out the maximum distance.
The stick should be just be movable inside the bounds without canceling the event so that I have to grab the stick again and again if I'm touching the bounds (going out of the maximum distance).
How to implement a working joystick using jQuery + jQueryUI?
The issue with your logic is that as soon as the drag event is prevented the distance value will be over 60 due to the inherent delays in JS processing time. Therefore the logic in the next drag is immediately cancelled as the distance > 60 check is immediately hit. While it would be possible to fix this, a much better solution would be to not allow the value to ever be greater than the limit you set.
To achieve this I would not recommend using jQueryUI. You can do it quite easily using native methods which give you more direct control of the positioning without having to fight against any built in logic.
It's also slightly more performant, which is vital when dealing with game mechanics; especially when dealing with direct user input which needs to be as responsive as possible.
With that said, you can use modify the basic logic as laid out in Twisty's comment on this question. Then it simply becomes a question of changing the size of the relevant elements, which is a trivial task. Try this:
var $canvas = $('#background');
var $pointer = $('#stick');
var $window = $(window);
var settings = {
width: $canvas.prop('offsetWidth'),
height: $canvas.prop('offsetHeight'),
top: $canvas.prop('offsetTop'),
left: $canvas.prop('offsetLeft')
};
settings.center = [settings.left + settings.width / 2, settings.top + settings.height / 2];
settings.radius = settings.width / 2;
let mousedown = false;
$window.on('mouseup', function() { mousedown = false; });
$pointer.on('mousedown', function() { mousedown = true; });
$pointer.on('mouseup', function() { mousedown = false; });
$pointer.on('dragstart', function(e) { e.preventDefault(); });
$window.on('mousemove', function(e) {
if (!mousedown)
return;
var result = limit(e.clientX, e.clientY);
$pointer.css('left', result.x + 'px');
$pointer.css('top', result.y + 'px');
});
function limit(x, y) {
var dist = distance([x, y], settings.center);
if (dist <= settings.radius) {
return {
x: x,
y: y
};
} else {
x = x - settings.center[0];
y = y - settings.center[1];
var radians = Math.atan2(y, x)
return {
x: Math.cos(radians) * settings.radius + settings.center[0],
y: Math.sin(radians) * settings.radius + settings.center[1]
}
}
}
function distance(dot1, dot2) {
var x1 = dot1[0],
y1 = dot1[1],
x2 = dot2[0],
y2 = dot2[1];
return Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2));
}
html,
body {
height: 100%;
}
#background {
background-image: url('https://i.stack.imgur.com/5My6q.png');
position: absolute;
height: 200px;
width: 200px;
top: 50%;
left: 50%;
margin: -100px 0 0 -100px;
border-radius: 200px;
border: dashed #ccc 1px;
}
#stick {
background: transparent url('https://i.stack.imgur.com/YEoJ4.png') 50% 50%;
position: absolute;
width: 100px;
height: 100px;
border-radius: 100px;
margin: -50px 0 0 -50px;
top: 50%;
left: 50%;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="background"></div>
<div id="stick"></div>