I cannot clear the cursor image (canvas.getBoundingClientRect) after the cursor moves across the canvas element! I am left with a trail of appended images on the canvas.
See my code :
<script>
window.addEventListener("load", CanvasProperties, false);
//Global Variables
var canvas, context;
// Canvase Element - 2D Properties
function CanvasProperties(){
canvas = document.getElementById("canvas");
context = canvas.getContext("2d");
window.addEventListener("mousemove", CustomCursor, false);};
// Customized Cursor for Game's Canvas
function CustomCursor(e){
var canvasRect = canvas.getBoundingClientRect();
var xPosition = e.clientX - 5 - canvasRect.left;
var yPosition = e.clientY - 5 - canvasRect.top;
var img = new Image();
img.src = "hero.png";
context.drawImage(img, xPosition, yPosition, 80, 80);};
</script>
Yeah, this one was really hard to google. The answer I like the best: https://stackoverflow.com/a/2142549/607407
function CustomCursor(e){
var canvasRect = canvas.getBoundingClientRect();
var img = new Image();
img.src = "https://crossorigin.me/https://www.gravatar.com/avatar/5a061a72feb5b6580dadd5dcbc92d3b5?s=64&d=identicon&r=PG";
var xPosition = e.clientX - 5 - canvasRect.left-img.naturalWidth/2;
var yPosition = e.clientY - 5 - canvasRect.top- img.naturalHeight/2;
context.clearRect(0, 0, canvas.width, canvas.height);
context.drawImage(img, xPosition, yPosition, 80, 80);
};
Snippet:
//Global Variables - which is wrong
var canvas, context;
// Canvase Element - 2D Properties
function CanvasProperties(){
canvas = document.getElementById("canvas");
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
context = canvas.getContext("2d");
window.addEventListener("mousemove", CustomCursor, false);
}
// Customized Cursor for Game's Canvas
function CustomCursor(e){
var canvasRect = canvas.getBoundingClientRect();
var img = new Image();
img.src = "https://crossorigin.me/https://www.gravatar.com/avatar/5a061a72feb5b6580dadd5dcbc92d3b5?s=64&d=identicon&r=PG";
var xPosition = e.clientX - 5 - canvasRect.left-img.naturalWidth/2;
var yPosition = e.clientY - 5 - canvasRect.top- img.naturalHeight/2;
context.clearRect(0, 0, canvas.width, canvas.height);
context.drawImage(img, xPosition, yPosition, 80, 80);
};
CanvasProperties();
<canvas width="300" height="300" id="canvas" />