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script.js
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script.js
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//Selecting canvas element
const canvas = document.querySelector("canvas");
if (canvas.getContext) {
//make canvas to accept 2D
const ctx = canvas.getContext("2d");
let x = 100;
let y = 100;
/**
*Creates a 2D ball
* @author AmalZorba
* @param {number} center_x - x coordinate of center of 2D sphere
* @param {number} center_y - y coordinate of center of 2D sphere
* @param {number} radius - radius of the circle
* @return {circle}
*/
const drawBall = (center_x, center_y, radius) => {
ctx.beginPath();
const startingAngle = 0;
const endingAngle = 2 * Math.PI;
ctx.arc(center_x, center_y, radius, startingAngle, endingAngle);
ctx.fillStyle = "red";
ctx.fill();
};
canvas.addEventListener("keydown", function (e) {
//37,38,39,40 are the ASCII codes to arrow keys on clockwise from left arrow key
//left arrow
if (e.keyCode === 37) {
x--;
}
//up arrow
if (e.keyCode === 38) {
y++;
}
//right arrow
if (e.keyCode === 39) {
x++;
}
//down arrow
if (e.keyCode === 40) {
y--;
}
});
drawBall(x, y, 20);
}