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game.js
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game.js
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function load_images() {
// player, virus, gem
enemy_image = new Image;
enemy_image.src = "Assets/v1.png";
player_image = new Image;
player_image.src = "Assets/superhero.png";
gem_image = new Image;
gem_image.src = "Assets/gemm.png";
}
function init() {
// define the objects that we will have in the game
canvas = document.getElementById("mycanvas");
W = 700;
H = 400;
canvas.width = W;
canvas.height = H;
// create a context
pen = canvas.getContext('2d');
game_over = false;
e1 = {
x : 150,
y : 50,
w : 60,
h : 60,
speed : 20,
};
e2 = {
x: 300,
y: 150,
w: 60,
h: 60,
speed: 30,
};
e3 = {
x: 450,
y: 20,
w: 60,
h: 60,
speed: 40,
};
enemy = [e1, e2, e3];
player = {
x: 20,
y: H/2,
w: 60,
h: 60,
speed: 20,
moving : false,
health : 100,
};
gem = {
x: W-100,
y: H/2,
w: 60,
h: 60,
};
// listen to events on the canvas
canvas.addEventListener('mousedown', function() {
player.moving = true;
});
canvas.addEventListener('mouseup', function () {
player.moving = false;
});
}
function isOverlap(rect1, rect2) {
if (rect1.x < rect2.x + rect2.w &&
rect1.x + rect1.w > rect2.x &&
rect1.y < rect2.y + rect2.h &&
rect1.y + rect1.h > rect2.y) {
return true;
}
return false;
}
function draw() {
//clear the canvas area for the old frame
pen.clearRect(0, 0, W, H);
pen.fillStyle = "red";
// pen.fillRect(box.x, box.y, box.w, box.h);
// pen.drawImage(enemy_image, box.x, box.y, box.w, box.h);
//draw the player
pen.drawImage(player_image, player.x, player.y, player.w, player.h);
//draw the gem
pen.drawImage(gem_image, gem.x, gem.y, gem.w, gem.h);
for (let i=0; i<enemy.length; i++) {
pen.drawImage(enemy_image, enemy[i].x, enemy[i].y, enemy[i].w, enemy[i].h);
}
pen.fillStyle = "white";
pen.fillText("Score : " + player.health, 10, 10);
}
function update() {
//if the player is moving
if (player.moving == true) {
player.x += player.speed;
player.health += 20;
}
for (let i=0; i<enemy.length; i++) {
if (isOverlap(enemy[i], player)) {
player.health -= 50;
if (player.health < 0) {
game_over = true;
alert("Game Over, Health is : " + player.health);
}
}
}
// gem overlap
if (isOverlap(player, gem)) {
alert("You Won!");
game_over = true;
return;
}
// move the box downwards
// update each enemy by the same logic (using loop)
for (let i=0; i<enemy.length; i++) {
enemy[i].y += enemy[i].speed;
if (enemy[i].y > H-enemy[i].h || enemy[i].y < 0) {
enemy[i].speed *= -1;
}
}
}
function gameloop() {
if (game_over == true) {
clearInterval(f);
}
draw();
update();
}
load_images();
init();
var f = setInterval(gameloop, 100);