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shooter.html
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shooter.html
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<html>
<head>
<style>
canvas{
background-color: white;
}
</style>
</head>
<body onload="startGame()" style="background-color: black;">
<canvas id="area">
</canvas>
<div id="buttons">
</div>
<script>
var myGamePiece;
var myBullets=[];
var enemies=[];
var enemyBullets=[];
var spawnspeed=1000;
var score=0;
function startGame(){
myBullets=[];
enemies=[];
enemyBullets=[];
spawnspeed=1000;
score=0;
myGameArea.start()
myGamePiece=new component(400,200,"black",20,20)
}
myGameArea={
canvas : document.getElementById("area"),
start : function() {
this.canvas.width = 960;
this.canvas.height = 540;
this.context = this.canvas.getContext("2d");
document.body.insertBefore(this.canvas, document.body.childNodes[0]);
this.frameNo = 0;
this.interval = setInterval(updateGameArea,20);
window.addEventListener('keydown', (e)=> {
myGameArea.key = e.keyCode;
//console.log(e.keyCode)
})
window.addEventListener('keyup', (e)=> {
myGameArea.key = false;
})
window.addEventListener('click', (e)=> {
//myGameArea.key = false;
//console.log(e)
myBullets.push(new bullet(myGamePiece.x, myGamePiece.y, "blue", e.x-10, e.y-10))
//new bullet(myGamePiece.x, myGamePiece.y, "blue", e.x-15, e.y-15)
})
},
clear : function() {
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
},
stop : function() {
clearInterval(this.interval);
}
}
function bullet(x,y,color,destinationx, destinationy){
this.x=x;
this.y=y;
this.startx=x;
this.starty=y;
this.finalx=destinationx;
this.finaly=destinationy;
this.width=10;
this.height=10;
if(x!=destinationx){
this.slope=((destinationy-y)/(destinationx-x));
}else{
this.slope=0;
}
//console.log(this.slope)
this.update=()=>{
ctx=myGameArea.context;
ctx.fillStyle=color;
ctx.fillRect(this.x, this.y, 10,10)
//console.log(myBullets)
}; this.crashWith = function(otherobj) {
//console.log(otherobj)
//console.log(this)
var myleft = this.x;
var myright = this.x + (this.width);
var mytop = this.y;
var mybottom = this.y + (this.height);
var otherleft = otherobj.x;
var otherright = otherobj.x + (otherobj.width);
var othertop = otherobj.y;
var otherbottom = otherobj.y + (otherobj.height);
var crash = true;
if ((mybottom < othertop) ||
(mytop > otherbottom) ||
(myright < otherleft) ||
(myleft > otherright)) {
crash = false;
}
return crash;
};
}
function everyinterval(n) {
if ((myGameArea.frameNo / n) % 1 == 0) {
return true;
}
return false;
}
function component(x,y,color, width, height){
this.x=x;
this.y=y;
this.width = width;
this.height = height;
this.update=()=>{
ctx=myGameArea.context;
ctx.fillStyle=color;
ctx.fillRect(this.x,this.y,this.width, this.height)
}; this.crashWith = function(otherobj) {
var myleft = this.x;
var myright = this.x + (this.width);
var mytop = this.y;
var mybottom = this.y + (this.height);
var otherleft = otherobj.x;
var otherright = otherobj.x + (otherobj.width);
var othertop = otherobj.y;
var otherbottom = otherobj.y + (otherobj.height);
var crash = true;
if ((mybottom < othertop) ||
(mytop > otherbottom) ||
(myright < otherleft) ||
(myleft > otherright)) {
crash = false;
}
return crash;
}
}
function enemy(x,y,color, width, height, destinationx, destinationy){
this.reload=0;
this.x=x;
this.y=y;
this.width = width;
this.height = height;
this.startx=x;
this.starty=y;
this.finalx=destinationx;
this.finaly=destinationy;
if(x!=destinationx){
this.slope=((destinationy-y)/(destinationx-x));
}else{
this.slope=0;
}
this.update=()=>{
ctx=myGameArea.context;
ctx.fillStyle=color;
ctx.fillRect(this.x,this.y,this.width, this.height)
}; this.crashWith = (otherobj)=> {
var myleft = this.x;
var myright = this.x + (this.width);
var mytop = this.y;
var mybottom = this.y + (this.height);
var otherleft = otherobj.x;
var otherright = otherobj.x + (otherobj.width);
var othertop = otherobj.y;
var otherbottom = otherobj.y + (otherobj.height);
var crash = true;
if ((mybottom < othertop) ||
(mytop > otherbottom) ||
(myright < otherleft) ||
(myleft > otherright)) {
crash = false;
}
return crash;
}
}
function end(){
myGameArea.clear()
ctx=myGameArea.context;
ctx.font="30px Arial"
ctx.fillText("Game Over", 250,150)
ctx.fillText("Your Score was: "+score, 250, 200)
document.getElementById("buttons").innerHTML='<button onclick="startGame(); disappear();" style="position: absolute; top:250px; left:300px;">Play Again</button>';
}
function disappear(){
document.getElementById("buttons").innerHTML="";
}
function updateGameArea(){
myGameArea.clear()
if(everyinterval(spawnspeed)){
console.log(Math.floor(Math.random()*2))
var num = Math.floor(Math.random()*4);
if(num==0){
var second=Math.floor(Math.random()*(myGameArea.canvas.height-10));
enemies.push(new enemy(0, second,"green", 20, 20, myGamePiece.x, myGamePiece.y))
}else if (num==1){
var second=Math.floor(Math.random()*(myGameArea.canvas.width-10));
enemies.push(new enemy(second, 0,"green", 20, 20, myGamePiece.x, myGamePiece.y))
}else if(num==2){
var second=Math.floor(Math.random()*(myGameArea.canvas.height-10));
enemies.push(new enemy( myGameArea.canvas.width,second,"green", 20, 20, myGamePiece.x, myGamePiece.y))
}else if(num==3){
var second=Math.floor(Math.random()*(myGameArea.canvas.width-10));
enemies.push(new enemy(second, myGameArea.canvas.height,"green", 20, 20, myGamePiece.x, myGamePiece.y))
}
//enemies.shift()
//console.log(enemies)
}
if(everyinterval(1)){
if(spawnspeed!=75){
spawnspeed+=-1;
}
}
if (myGameArea.key && myGameArea.key == 38 && myGamePiece.y>0) {myGamePiece.y += -5; }
if (myGameArea.key && myGameArea.key == 87 && myGamePiece.y>0) {myGamePiece.y += -5; }
if (myGameArea.key && myGameArea.key == 40&& myGamePiece.y<520) {myGamePiece.y += 5; }
if (myGameArea.key && myGameArea.key == 83&& myGamePiece.y<520) {myGamePiece.y += 5; }
if (myGameArea.key && myGameArea.key == 37&& myGamePiece.x>0) {myGamePiece.x += -5; }
if (myGameArea.key && myGameArea.key == 65&& myGamePiece.x>0) {myGamePiece.x += -5; }
if (myGameArea.key && myGameArea.key == 39&& myGamePiece.x<940) {myGamePiece.x += 5; }
if (myGameArea.key && myGameArea.key == 68&& myGamePiece.x<940) {myGamePiece.x += 5; }
myGameArea.frameNo+=1;
myGamePiece.update()
for(i=0; i<myBullets.length;i++){
for(j=0;j<enemyBullets.length;j++){
if(enemyBullets[j].crashWith(myBullets[i])){
console.log("crash")
enemyBullets.splice(j,1)
myBullets.splice(i,1)
}
}
var angle=Math.atan(Math.abs(myBullets[i].slope), 1)
var base=2*Math.cos(angle)
var height=2*Math.sin(angle)
if(myBullets[i].finalx>myBullets[i].startx&&myBullets[i].finaly<myBullets[i].starty){
//quadrant 1
myBullets[i].x+=base;
myBullets[i].y+=-height;
}else if(myBullets[i].finalx<myBullets[i].startx&&myBullets[i].finaly<myBullets[i].starty){
//quadrant 2
myBullets[i].x+=-base;
myBullets[i].y+=-height;
}else if(myBullets[i].finalx<myBullets[i].startx&&myBullets[i].finaly>myBullets[i].starty){
//quadrant 3
myBullets[i].x+=-base;
myBullets[i].y+=height;
}else if(myBullets[i].finalx>myBullets[i].startx&&myBullets[i].finaly>myBullets[i].starty){
//quadrant 4
myBullets[i].x+=base;
myBullets[i].y+=height;
}
myBullets[i].update()
}
for(i=0;i<enemyBullets.length;i++){
if(enemyBullets[i].crashWith(myGamePiece)){
myGameArea.stop()
end()
}
var angle=Math.atan(Math.abs(enemyBullets[i].slope), 1)
var base=2*Math.cos(angle)
var height=2*Math.sin(angle)
if(enemyBullets[i].finalx>enemyBullets[i].startx&&enemyBullets[i].finaly<enemyBullets[i].starty){
//quadrant 1
enemyBullets[i].x+=base;
enemyBullets[i].y+=-height;
}else if(enemyBullets[i].finalx<enemyBullets[i].startx&&enemyBullets[i].finaly<enemyBullets[i].starty){
//quadrant 2
enemyBullets[i].x+=-base;
enemyBullets[i].y+=-height;
}else if(enemyBullets[i].finalx<enemyBullets[i].startx&&enemyBullets[i].finaly>enemyBullets[i].starty){
//quadrant 3
enemyBullets[i].x+=-base;
enemyBullets[i].y+=height;
}else if(enemyBullets[i].finalx>enemyBullets[i].startx&&enemyBullets[i].finaly>enemyBullets[i].starty){
//quadrant 4
enemyBullets[i].x+=base;
enemyBullets[i].y+=height;
}
enemyBullets[i].update()
}
//console.log(enemies.length)
for(i=0;i<enemies.length;i++){
//enemies[i].x+=1;
if(enemies[i].crashWith(myGamePiece)){
console.log("dead")
myGameArea.stop()
end()
console.log(score)
break
}
var slope = ((myGamePiece.y-enemies[i].y)/(myGamePiece.x-enemies[i].x))
var angle = Math.atan(Math.abs(slope), 1)
var base=Math.cos(angle)
var height=Math.sin(angle)
if(myGamePiece.x>enemies[i].x&&myGamePiece.y<enemies[i].y){
//quadrant 1
enemies[i].x+=base;
enemies[i].y+=-height;
}else if(myGamePiece.x<enemies[i].x&&myGamePiece.y<enemies[i].y){
//quadrant 2
enemies[i].x+=-base;
enemies[i].y+=-height;
}else if(myGamePiece.x<enemies[i].x&&myGamePiece.y>enemies[i].y){
//quadrant 3
enemies[i].x+=-base;
enemies[i].y+=height;
}else if(myGamePiece.x>enemies[i].x&&myGamePiece.y>enemies[i].y){
//quadrant 4
enemies[i].x+=base;
enemies[i].y+=height;
}
//console.log(myBullets.length)
for(j=0;j<myBullets.length;j++){
if(myBullets[j].crashWith(enemies[i])){
console.log("hit")
enemies.splice(i, 1)
score+=1;
myBullets.splice(j, 1)
//myGameArea.stop()
}
}
if(enemies[i].reload==100){
console.log("shot")
enemyBullets.push(new bullet(enemies[i].x, enemies[i].y, "red", myGamePiece.x, myGamePiece.y))
enemies[i].reload=0;
}else{
enemies[i].reload+=1;
}
enemies[i].update()
}
//myGameArea.clear()
}
</script>
</body>
</html>