JS Mario 5-Goomba
A lesson designed to help you create your own Goombas for your game
| Overview | Player | Platform | Tube | Block | Goomba | Background |
%%html
<style>
#canvas {
margin: 0;
border: 1px solid white;
}
</style>
<canvas id='canvas'></canvas>
<script>
let canvas = document.getElementById('canvas');
let c = canvas.getContext('2d');
canvas.width = 650;
canvas.height = 400;
let gravity = 1.5;
class Player {
constructor() {
this.position = {
x: 100,
y: 200
};
this.velocity = {
x: 0,
y: 0
};
this.width = 30;
this.height = 30;
}
draw() {
c.fillStyle = 'red';
c.fillRect(this.position.x, this.position.y, this.width, this.height);
}
update() {
this.draw();
this.position.y += this.velocity.y;
this.position.x += this.velocity.x;
if (this.position.y + this.height + this.velocity.y <= canvas.height)
this.velocity.y += gravity;
else
this.velocity.y = 0;
}
}
class Platform {
constructor(image) {
this.position = {
x: 0,
y: 300
}
this.image = image;
this.width = 650;
this.height = 100;
}
draw() {
c.drawImage(this.image, this.position.x, this.position.y, this.width, this.height);
}
}
class Tube {
constructor(image) {
this.position = {
x: 500,
y: 180
}
this.image = image;
this.width = 100;
this.height = 120;
}
draw() {
c.drawImage(this.image, this.position.x, this.position.y, this.width, this.height);
}
}
class BlockObject {
constructor(image) {
this.position = {
x: 200,
y: 100
};
this.image = image;
this.width = 158;
this.height = 79;
}
draw() {
c.drawImage(this.image, this.position.x, this.position.y);
}
}
//--
// NEW CODE - CREATE GOOMBA CLASS
//--
class Goomba {
constructor(image) {
this.position = {
x: 250,
y: 245
};
this.image = image;
this.width = 55;
this.height = 55;
this.velocity = {
x: -2,
y: 0
}
}
draw() {
c.drawImage(this.image, this.position.x, this.position.y, this.width, this.height);
}
update() {
this.position.x += this.velocity.x;
this.draw();
}
}
let image = new Image()
let imageTube = new Image()
let imageBlock = new Image()
image.src = 'https://samayass.github.io/samayaCSA/images/platform.png'
imageTube.src = 'https://samayass.github.io/samayaCSA/images/tube.png'
imageBlock.src = 'https://samayass.github.io/samayaCSA/images/box.png';
//--
// NEW CODE - ADD GOOMBA IMAGE
//--
let imageGoomba = new Image()
imageGoomba.src = 'https://samayass.github.io/samayaCSA/images/goomba.png';
let platform = new Platform(image)
let tube = new Tube(imageTube)
let blockObject = new BlockObject(imageBlock)
let goomba = new Goomba(imageGoomba)
player = new Player()
let keys = {
right: {
pressed: false
},
left: {
pressed: false
}
}
function animate() {
requestAnimationFrame(animate);
c.clearRect(0, 0, canvas.width, canvas.height);
platform.draw();
player.update();
tube.draw();
blockObject.draw();
//--
// NEW CODE - UPDATE GOOMBA ANIMATION
//--
goomba.update();
if (
player.position.y + player.height <= blockObject.position.y &&
player.position.y + player.height + player.velocity.y >= blockObject.position.y &&
player.position.x + player.width >= blockObject.position.x &&
player.position.x <= blockObject.position.x + blockObject.width
)
{
player.velocity.y = 0;
}
if (keys.right.pressed && player.position.x + player.width <= canvas.width - 50) {
player.velocity.x = 15;
} else if (keys.left.pressed && player.position.x >= 50) {
player.velocity.x = -15;
} else {
player.velocity.x = 0;
}
if (
player.position.y + player.height <= platform.position.y &&
player.position.y + player.height + player.velocity.y >= platform.position.y &&
player.position.x + player.width >= platform.position.x &&
player.position.x <= platform.position.x + platform.width
)
{
player.velocity.y = 0;
}
if (
player.position.y + player.height <= tube.position.y &&
player.position.y + player.height + player.velocity.y >= tube.position.y &&
player.position.x + player.width >= tube.position.x &&
player.position.x <= tube.position.x + tube.width
) {
player.velocity.y = 0;
player.position.y += 0.1
player.velocity.y = 0.0001
gravity = 0.2
}
if (player.position.y + player.height == tube.position.y + tube.height ||
player.position.y + player.height <= tube.position.y ||
player.position.x + player.width <= tube.position.x ||
player.position.x >= tube.position.x + tube.width) {
gravity = 1.5
}
if (
player.position.x + player.width<= tube.position.x &&
player.position.x + player.width + player.velocity.x >= tube.position.x &&
player.position.y + player.height >= tube.position.y &&
player.position.y <= tube.position.y + tube.height
)
{
player.velocity.x = 0;
}
if (
player.position.x >= tube.position.x + tube.width &&
player.position.x + player.velocity.x <= tube.position.x + tube.width &&
player.position.y + player.height >= tube.position.y &&
player.position.y <= tube.position.y + tube.height
)
{
player.velocity.x = 0;
}
if (
player.position.x >= tube.position.x &&
player.position.x + player.velocity.x <= tube.position.x &&
player.position.y + player.height >= tube.position.y &&
player.position.y <= tube.position.y + tube.height
)
{
player.velocity.x = 0;
}
if (
player.position.x + player.width <= tube.position.x + tube.width &&
player.position.x + player.width + player.velocity.x >= tube.position.x + tube.width &&
player.position.y + player.height >= tube.position.y &&
player.position.y <= tube.position.y + tube.height
)
{
player.velocity.x = 0;
}
//--
// NEW CODE - GOOMBA COLLISION DETECTION
//--
if(
player.position.y + player.height <= goomba.position.y &&
player.position.y + player.height + player.velocity.y >= goomba.position.y &&
player.position.x + player.width >= goomba.position.x &&
player.position.x <= goomba.position.x + goomba.width
)
{
player.velocity.y = -20;
}
if (
goomba.position.x >= platform.position.x &&
goomba.position.x <= platform.position.x
)
{
goomba.velocity.x = 2;
}
if (
goomba.position.x + goomba.width <= tube.position.x &&
goomba.position.x + goomba.width + goomba.velocity.x >= tube.position.x
)
{
goomba.velocity.x = -2;
}
}
animate();
addEventListener('keydown', ({ keyCode }) => {
switch (keyCode) {
case 65:
console.log('left');
keys.left.pressed = true;
break;
case 83:
console.log('down');
break;
case 68:
console.log('right');
keys.right.pressed = true;
break;
case 87:
console.log('up');
player.velocity.y -= 20;
break;
}
});
addEventListener('keyup', ({ keyCode }) => {
switch (keyCode) {
case 65:
console.log('left');
keys.left.pressed = false;
break;
case 83:
console.log('down');
break;
case 68:
console.log('right');
keys.right.pressed = false;
break;
case 87:
console.log('up');
player.velocity.y = -20;
break;
}
})
</script>
Specific Hacks
- Add more goombas
- Have the player jump on the goombas to make them disappear
- Have the goombas “kill” the player and restart the game