Canvas Bootcamp 14 - Mouse Coordinates JavaScript Tutorial

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In this exercise we are going to cover one of the most crucial aspects of making interactive canvas applications with JavaScript. We will demonstrate how to read or capture the user mouse coordinates upon specific events.

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Five years on and this is still extremely useful.
Many Thanks for sharing your knowledge

samdavepollard

wow very important tutorial even after 9 years

mohammadnoushadsiddiqui

I used this explanation to move the paddle on my little breakout game. Thanks brother.

ninthcrusade

Great video! Exactly what I was looking for. Going to watch all the rest videos.

janokotek

Great video. You have explained things much better than many others. Thanks much!

joeandurien

These tutorials ROCK. They are the best things going!!! Change

chrismalcheski

This is actually a very important tutorial.. Thank you Adam...

killerb

If you create an element and add ID attribute to it, browser will automatically create a variable equal to its ID and referencing it to that element. So you don't need to create the "status" variable and assign because "status was already created, you can just type "status" without creating a var and it's equal to already.

great videos btw, im learning a lot. thanks.

edko

Amazing man, thanks for clarifying mouse coordinates! :)

Anothergames

Hey Thanks, Adam Khoury, this video is very help full for me, to do my Class project about Canvas. Thanks.

Jony

Hai, I want to get the canvas coordinates when canvas is wrapped under div which is scrollable area.

anandks

How many parts will this series have? I think they're quite helpful. Thanks a lot Adam!

ChristFan

I wanted to change the background color according to the mouse position on the canvas, This is the bass of the my idea so thank you for that. How would I apply this to my code? do I use a class/id?

avigdahlpeck

Alright, I understand everything in this video. I'm just curious. After making the rectangles show up where the clientX, ClientY clicks, how would I precede to animate the rectangles? Like for instance, to make the rectangles to slide down the screen.

augusttierney

Scrolling the page that the canvas is on ruins the Y-coordinate for me! What is going on?

oomoses

Hey Adam, thatnk you for this greate video! Please I have a question to ask you; I've tried many ways to create a circle enstead of a box. see this code which id did not work with me.

<!DOCTYPE html>
<html>
<head>
<style>
</style>
<script>
window.onload = function () {
var canvas =
ctx = canvas.getContext("2d");
x1 = 50;
y1 = 50;
moving, move;

ctx.canvas.addEventListener("mousedown", function(event){ moving= true; move(event); });
ctx.canvas.addEventListener("mousemove", function(event){ move(event); });
ctx.canvas.addEventListener("mouseup", function(){ moving= false; });

function move(event){
if (moving){
mouseX = event.clientX - ctx.canvas.offsetLeft;
mouseY = event.clientY - ctx.canvas.offsetTop;

= mouseX;
= mouseY;

0, 500, 500);
= "red";
mouseY, 15, 0, Math.PI*2, false);

}
}

}
</script>
</head>
<body>
<canvas id="canvas" width="500" height="500" ></canvas>
</body>
</html>

Thank you for your time!! ^___^

adildafrallah

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