Move image smoothly on an HTML5 canvas - html

Question

I am moving an inserted image within a Canvas.
HTML
<div id="left">move left</div>
jQuery:
let MoveLeft=0;
$("#left").on("click", function(){
MoveLeft+=10;
});
In the canvas function
function(){
.....
var LeftPos=100; //default
If(MoveLeft!=0)
LeftPos=LeftPos + MoveLeft;
}
ctx.drawImage(img,0,0,imgW,imgH,LeftPos,0,imgW,imgH);
This works, but the movement takes place in a single jump. How do I translate the image smoothly? Like an animation?
let GlassesUp = 0;
$('.MoveGlasses').on("click", function(event) {
if ($(this).hasClass("MoveGlassesUp")) {
GlassesUp += 10;
}
drawMe();
});
var canvas = document.getElementById('cv');
ctx = canvas.getContext('2d');
// core drawing function
var drawMe = function() {
var ImgGlasses = document.getElementById('glasses');
canvas.width = 400;
canvas.height = 400;
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.fillStyle = 'red';
ctx.fillRect(0, 0, canvas.width, canvas.height);
var GUp = 50;
if (GlassesUp != 0) {
GUp = GUp - GlassesUp;
//alert(GUp)
}
ctx.drawImage(ImgGlasses, 0, 0, 250, 250, 50, GUp, 250, 250);
}
drawMe();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<div class="MoveGlasses MoveGlassesUp">Up</div>
<canvas id="cv"></canvas>
<img src="https://image.flaticon.com/icons/svg/126/126514.svg" style="height:60px;width:100px;opacity:0" id="glasses" />

Answer 1

The draw function displaces the image by 0.7 per 100ms. You can adjust these two parameters.
let GlassesUp = 0;
var t;
$('.MoveGlassesUp').on("click", function(event) {
clearInterval(t)
t = setInterval(function() {
GlassesUp += 0.7;
drawMe();
}, 100);
setTimeout("clearInterval(t)", 1000)
});
$('.MoveGlassesDown').on("click", function(event) {
clearInterval(t)
t = setInterval(function() {
GlassesUp -= 0.7;
drawMe();
}, 100);
setTimeout("clearInterval(t)", 1000)
});
var canvas = document.getElementById('cv');
ctx = canvas.getContext('2d');
// core drawing function
var drawMe = function() {
var ImgGlasses = document.getElementById('glasses');
canvas.width = 400;
canvas.height = 400;
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.fillStyle = 'red';
ctx.fillRect(0, 0, canvas.width, canvas.height);
var GUp = 50;
if (GlassesUp != 0) {
GUp = GUp - GlassesUp;
//alert(GUp)
}
ctx.drawImage(ImgGlasses, 0, 0, 250, 250, 50, GUp, 250, 250);
}
drawMe();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<button class="MoveGlasses MoveGlassesUp">up</button>
<button class="MoveGlasses MoveGlassesDown">down</button>
<hr/>
<canvas id="cv"></canvas>
<img src="https://image.flaticon.com/icons/svg/126/126514.svg" style="height:60px;width:100px;opacity:0" id="glasses" />