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canvas.html
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<!DOCTYPE html>
<html>
<head>
<title>canvas</title>
<style type="text/css">
#canvas_bg {
position: absolute;
z-index: 0;
right: calc(50vw - 300px);
bottom: calc(50vh - 375px);
}
#canvas {
border: 5px white solid;
background: black;
}
#start_button {
background-color: #FFFFFF;
border: solid 3px #000000;
font-size: 40px;
width: 150px;
height: 50px;
z-index: 2;
position: absolute;
left: calc(50% + 100px);
top: calc(50% - 25px);
}
body {
background-color: #000000;
}
#Point {
color: white;
position: absolute;
top: 350px;
left: 50px;
font-size: 30px;
font-family: "微軟正黑體";
}
#HP {
color: white;
position: absolute;
top: 280px;
left: 50px;
font-size: 30px;
font-family: "微軟正黑體";
}
#list {
background-color: black;
border: solid 3px white;
font-size: 40px;
width: 400px;
height: 500px;
z-index: 3;
position: absolute;
left: calc(50vw - 200px);
top: calc(50vh - 250px);
visibility: collapse;
color: white;
text-align: center;
font-size: 40px;
font-family: "微軟正黑體";
}
</style>
<script type="text/javascript">
//key event
var key = {
left: false,
up: false,
right: false,
down: false,
space: false
};
function keyEvent(event) {
var key_pressed = event.keyCode || event.which;
switch (key_pressed) {
case 37:
case 65:
key.left = true;
break;
case 38:
case 87:
key.up = true;
break;
case 39:
case 68:
key.right = true;
break;
case 40:
case 83:
key.down = true;
break;
case 32:
key.space = true;
break;
}
}
//image
function keyEventEnd(event) {
var key_pressed = event.keyCode || event.which;
switch (key_pressed) {
case 37:
case 65:
key.left = false;
break;
case 38:
case 87:
key.up = false;
break;
case 39:
case 68:
key.right = false;
break;
case 40:
case 83:
key.down = false;
break;
case 32:
key.space = false;
break;
}
}
var m_bullets = new Array();
var enemies = new Array();
var e_bullets = new Array();
var effects = new Array();
var game = {
point: 0,
tick: 0,
ticking: true,
time: 0,
end: false,
total_point: 0,
waiting: undefined,
freeze: function() {
++this.tick;
this.ticking = false;
var me = this;
this.waiting = setInterval(function() {
if(enemies.length === 0) {
me.ticking = true;
clearInterval(me.waiting);
}
}, 10);
},
};
function start() {
//declare
document.getElementById("Point").innerHTML = "Point: " + game.point;
document.getElementById("start_button").style.visibility = "collapse";
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var ani_frame;
var frame = {
x: canvas.width,
y: canvas.height,
}
var main = {
x: frame.x/2,
y: frame.y/2,
x_v: 5,
y_v: 5,
radius: 10,
attack: 1,
health: 100,
img: new Image(),
img_timer: 0,
img_width: 42,
img_height: 32,
show_width: 50,
show_height: 40,
attack_timer: 0,
draw: function() {
if (this.img_timer>=80) this.img_timer = 0;
var init = Math.floor(this.img_timer/20)*this.img_width;
ctx.drawImage(this.img,init,0,this.img_width,this.img_height,this.x-(this.show_width/2),this.y-(this.show_height/2),this.show_width,this.show_height);
++this.img_timer;
if(this.attack_timer>0) --this.attack_timer;
document.getElementById("HP").innerHTML = "HP: " + this.health;
},
left_move: function() {
this.x -= this.x_v;
if(outOfFrame(this)) this.x += this.x_v;
},
up_move: function() {
this.y -= this.y_v;
if(outOfFrame(this)) this.y += this.y_v;
},
right_move: function() {
this.x += this.x_v;
if(outOfFrame(this)) this.x -= this.x_v;
},
down_move: function() {
this.y += this.y_v;
if(outOfFrame(this)) this.y -= this.y_v;
},
bullet: {
x: 0,
y: 0,
y_v: -10,
radius: 3,
attack: 5,
color: "white",
draw: function() {
ctx.beginPath();
ctx.arc(this.x,this.y,3,0,2*Math.PI,false);
ctx.fillStyle = this.color;
ctx.fill();
ctx.closePath();
},
move: function() {
this.y += this.y_v;
}
},
attack: function() {
if (this.attack_timer===0) {
var new_bullet = Object.assign({},this.bullet);
new_bullet.x=this.x;
new_bullet.y=this.y;
m_bullets.push(new_bullet);
this.attack_timer=5;
}
}
};
main.img.src = "img/main.png";
var mains = [];
mains.push(main);
function outOfFrame(obj) {
if(obj.x<0||obj.y<0||obj.x>frame.x||obj.y>frame.y) return true;
return false;
}
function outOfFrame_x(obj) {
if(obj.x<0||obj.x>frame.x) return true;
return false;
}
function outOfFrame_y(obj) {
if(obj.y<0||obj.y>frame.y) return true;
return false;
}
function outOfWorld(obj) {
if(obj.x<-30||obj.y<-30||obj.x>frame.x+30||obj.y>frame.y+30) return true;
return false;
}
//effect
var smoke = {
x: 0,
y: 0,
lifetime: 35,
img: new Image(),
img_width: 32,
img_height: 32,
radius: 0,
max_radius: 0,
draw: function() {
this.radius = this.max_radius*(40-this.lifetime)/40;
ctx.drawImage(this.img,0,0,this.img_width,this.img_height,this.x-(this.radius),this.y-(this.radius),this.radius*2,this.radius*2);
--this.lifetime;
},
};
smoke.img.src = "img/smoke.png";
//enemy
var enemy_sample = {
name: "",
x: 0,
y: 0,
x_v: 0,
y_v: 0,
x_a: 0,
y_a: 0,
health: 0,
loot: 0,
radius: 0,
attack: 0,
cd: 50,
attack_timer: 0,
img: undefined,
stopable: false,
bounceable: false,
img_timer: 0,
img_width: 0,
img_height: 0,
show_width: 0,
show_height: 0,
draw: function() {
if (this.img_timer>=80) this.img_timer = 0;
var init = Math.floor(this.img_timer/20)*this.img_width;
ctx.drawImage(this.img,init,0,this.img_width,this.img_height,this.x-(this.show_width/2),this.y-(this.show_height/2),this.show_width,this.show_height);
++this.img_timer;
},
move: function() {
if(this.bounceable && outOfFrame_x(this)) {
this.x_v *= -1;
}
if(this.bounceable && outOfFrame_y(this)) {
this.y_v *= -1;
}
this.x += this.x_v;
this.y += this.y_v;
this.x_v += this.x_a;
this.y_v += this.y_a;
},
dead: function() {
var new_effect = Object.assign({},smoke);
new_effect.max_radius = this.radius;
new_effect.x = this.x;
new_effect.y = this.y;
effects.push(new_effect);
},
bullet: undefined,
skill: function() {},
}
var bullet_sample = {
x: 0,
y: 0,
x_v: 0,
y_v: 0,
radius: 5,
attack: 0,
color: "",
draw: function() {
ctx.beginPath();
ctx.arc(this.x,this.y,this.radius,0,2*Math.PI,false);
ctx.fillStyle = this.color;
ctx.fill();
ctx.closePath();
},
move: function() {
this.x += this.x_v;
this.y += this.y_v;
},
skill: function() {},
}
// enemy1
var enemy1 = Object.assign({},enemy_sample);
enemy1.name = "enemy1";
enemy1.img = new Image();
enemy1.img.src = "img/enemy1.png";
enemy1.img_width = 40;
enemy1.img_height = 37;
enemy1.show_width = 50;
enemy1.show_height = 48;
enemy1.health = 30;
enemy1.radius = 25;
enemy1.attack = 2;
enemy1.loot = 25;
// enemy2
var enemy2 = Object.assign({},enemy_sample);
enemy2.name = "enemy2";
enemy2.img = new Image();
enemy2.img.src = "img/enemy2.png";
enemy2.img_width = 40;
enemy2.img_height = 37;
enemy2.show_width = 50;
enemy2.show_height = 48;
enemy2.health = 60;
enemy2.radius = 25;
enemy2.attack = 1;
enemy2.bullet = Object.assign({},bullet_sample);
enemy2.bullet.attack = 10;
enemy2.bullet.color = "red";
enemy2.loot = 50;
enemy2.skill = function() {
//stop moving
if(this.stopable && this.y_v<=0){
this.y_a = 0;
this.y_v = 0;
}
//attack
if(this.attack_timer>=this.cd) {
var new_bullet = Object.assign({},this.bullet);
new_bullet.x = this.x;
new_bullet.y = this.y;
var tan = (main.x-this.x)/(main.y-this.y);
var cos = ((main.y<this.y)?-1:1)/Math.sqrt(tan*tan+1);
var sin = tan*cos;
new_bullet.x_v = 3*sin;
new_bullet.y_v = 3*cos;
e_bullets.push(new_bullet);
this.attack_timer = 0;
}
++this.attack_timer;
};
//enemy3
var enemy3 = Object.assign({},enemy_sample);
enemy3.name = "enemy3";
enemy3.img = new Image();
enemy3.img.src = "img/enemy3.png";
enemy3.img_width = 40;
enemy3.img_height = 37;
enemy3.show_width = 70;
enemy3.show_height = 65;
enemy3.health = 180;
enemy3.radius = 35;
enemy3.attack = 1;
enemy3.bullet = Object.assign({},bullet_sample);
enemy3.bullet.attack = 15;
enemy3.bullet.color = "yellow";
enemy3.bullet.radius = 8;
enemy3.loot = 150;
enemy3.skill = function() {
//stop moving
if(this.stopable && this.y_v<=0){
this.y_a = 0;
this.y_v = 0;
}
//attack
if(this.attack_timer>=this.cd) {
for(var i=0; i<3;++i) {
var new_bullet = Object.assign({},this.bullet);
new_bullet.x = this.x;
new_bullet.y = this.y;
var angle = (i-1)*Math.PI/5
new_bullet.x_v = 6*Math.sin(angle);
new_bullet.y_v = 6*Math.cos(angle);
e_bullets.push(new_bullet);
}
this.attack_timer = 0;
}
++this.attack_timer;
};
//enemy4 (boss1)
var enemy4 = Object.assign({},enemy_sample);
enemy4.name = "enemy4";
enemy4.img = new Image();
enemy4.img.src = "img/enemy4.png";
enemy4.img_width = 40;
enemy4.img_height = 46;
enemy4.show_width = 80;
enemy4.show_height = 92;
enemy4.health = 2500;
enemy4.radius = 40;
enemy4.attack = 5;
enemy4.bullet = Object.assign({},bullet_sample);
enemy4.bullet.attack = 15;
enemy4.bullet.color = "cyan";
enemy4.bullet.radius = 15;
enemy4.stopable = true;
enemy4.phi = 0;
enemy4.loot = 200;
enemy4.bullet_v = 5;
enemy4.bullet_count = 30;
enemy4.cd = 200;
enemy4.phase = 1;
enemy4.skill = function() {
//second phase
if(this.phase!=2 && this.health<=1000){
this.phase = 2;
this.img.src = "img/blue_2.png";
this.bullet.radius = 32;
this.bullet_v = 1.2;
this.bullet_count = 12;
this.bullet.color = "#8823F4";
this.attack_timer = 0;
setTimeout(()=>{
this.phi = 0;
this.attack_timer = 0;
this.cd = 140;
}, 1000);
}
//stop moving
if(this.stopable && this.y_v<=0){
this.y_a = 0;
this.y_v = 0;
}
//attack
if(this.attack_timer>=this.cd) {
++this.phi;
if(!((this.phi==4||this.phi==8)&&this.phase==1)){
for(var i=-(this.bullet_count/2)+1; i<=this.bullet_count/2;++i) {
var new_bullet = Object.assign({},this.bullet);
new_bullet.x = this.x;
new_bullet.y = this.y;
var angle = this.phi*Math.PI/(this.bullet_count*2) + i*Math.PI/(this.bullet_count/2);
new_bullet.x_v = this.bullet_v*Math.sin(angle);
new_bullet.y_v = this.bullet_v*Math.cos(angle);
e_bullets.push(new_bullet);
}
}
if(this.phi==4) {
for(var i=-1;i<=1;++i){
var new_enemy = Object.assign({},enemy1);
new_enemy.x = this.x;
new_enemy.y = this.y;
new_enemy.x_v = i;
new_enemy.y_v = -6;
new_enemy.y_a = 0.1;
new_enemy.show_width = 70;
new_enemy.show_height = 66;
new_enemy.radius = 35;
new_enemy.loot = 0;
new_enemy.health = 100;
enemies.push(new_enemy);
}
} else if(this.phi>=8) {
this.phi = 0;
for(var i=0;i<2;++i){
var new_enemy = Object.assign({},enemy3);
new_enemy.x = this.x;
new_enemy.y = this.y;
new_enemy.x_v = (i===0)?-1:1;
new_enemy.health = 100;
new_enemy.cd = 50;
new_enemy.loot = 0;
enemies.push(new_enemy);
}
}
this.attack_timer = 0;
}
++this.attack_timer;
};
//draw
var bg = new Image();
bg.src = "img/boss.png";
function clear_all() { //turn the screen to black
var init;
if(game.tick<=2750) init = 213.5;
else if(game.tick>=3050) init = 0;
else init = 213.5*(1-(game.tick-2750)/300);
ctx.drawImage(bg,0,init,150,186.5,0,0,canvas.width,canvas.height);
}
function draw_frame() {
clear_all();
main.draw();
for(var i=0;i<enemies.length;++i) {
enemies[i].draw();
enemies[i].skill();
}
for(var i=0;i<m_bullets.length;++i) {
m_bullets[i].draw();
}
for(var i=0;i<e_bullets.length;++i) {
e_bullets[i].draw();
}
ani_frame = window.requestAnimationFrame(draw_frame);
}
//attack judgement
function attackedBy(me, others) {
for(var i=0;i<others.length;++i) {
if(Math.sqrt((me.x-others[i].x)*(me.x-others[i].x)+(me.y-others[i].y)*(me.y-others[i].y))<=me.radius+others[i].radius) return others[i].attack;
}
return 0;
}
//gamestart
draw_frame();
setInterval(function(){
//main injured, move
if(!game.end) {
if(key.left) {
main.left_move();
}
if(key.up) {
main.up_move();
}
if(key.right) {
main.right_move();
}
if(key.down) {
main.down_move();
}
if(key.space) {
main.attack();
}
main.health -= attackedBy(main,e_bullets);
main.health -= attackedBy(main,enemies);
}
//main die
if(main.health<=0 && !game.end) {
game.end = true;
var new_enemy = Object.assign({},enemy1);
new_enemy.health = 10000;
new_enemy.show_width = 0;
new_enemy.show_height = 0;
enemies.push(new_enemy);
main.show_width = 0;
main.show_height = 0;
game.ticking = false;
main.health = 0;
var list = document.getElementById("list");
list.style.visibility = "visible";
var pass = (main.health>0 ? "Congratulation!" : "You Lose...");
if(main.health<=0){
var gamepoint = 0;
}
else if(game.time<=15000){
var gamepoint = (-(game.time/410)*(game.time/410)+1435.8);
}
else{
var gamepoint = 100;
}
game.total_point = (game.point+Math.round(gamepoint)+main.health*5);
list.innerHTML = pass +
"<br><br>Point: " + game.point +
"<br>Time: " + Math.round(game.time/50) + " sec" +
"<br>Health: " + main.health +
"<br><br>Total Point: " + game.total_point;
}
//enemy move and injured
for(var i=0;i<enemies.length;++i) {
if(enemies[i].health<=0) {
game.point += enemies[i].loot;
enemies[i].dead();
document.getElementById("Point").innerHTML = "Point: " + game.point;
}
if(outOfWorld(enemies[i])||enemies[i].health<=0) {
if(enemies[i].name==="enemy4") {
game.end = true;
enemies.splice(0,enemies.length);
} else {
enemies.splice(i,1);
}
continue;
}
enemies[i].health -= attackedBy(enemies[i],m_bullets);
enemies[i].move();
}
for(var i=0;i<m_bullets.length;++i) {
if(outOfFrame(m_bullets[i])||attackedBy(m_bullets[i],enemies)!=0) {
m_bullets.splice(i,1);
continue;
}
m_bullets[i].move();
}
for(var i=0;i<e_bullets.length;++i) {
if(outOfWorld(e_bullets[i])||attackedBy(e_bullets[i],mains)!=0) {
e_bullets.splice(i,1);
continue;
}
e_bullets[i].move();
}
for(var i=0;i<effects.length;++i) {
if(effects[i].lifetime <= 0) {
effects.splice(i,1);
continue;
}
effects[i].draw();
}
//time table
switch (game.tick) {
case 250:
for(var i=0;i<3;++i){
var new_enemy = Object.assign({},enemy1);
new_enemy.x = 100*i+200;
new_enemy.y_v = 2;
enemies.push(new_enemy);
}
break;
case 500:
for(var i=0;i<5;++i){
var new_enemy = Object.assign({},enemy1);
new_enemy.x = 100*i+100;
new_enemy.y_v = 2-0.1*(i-2)*(i-2);
enemies.push(new_enemy);
}
break;
case 800:
for(var i=0;i<2;++i){
var new_enemy = Object.assign({},enemy2);
new_enemy.x = 300*i+150;
new_enemy.y_v = 4;
new_enemy.y_a = -0.035;
new_enemy.cd = 40;
new_enemy.stopable = true;
enemies.push(new_enemy);
}
game.freeze();
break;
case 950:
case 1100:
case 1250:
for(var i=0;i<2;++i){
var new_enemy = Object.assign({},enemy2);
new_enemy.x = 500*i+50;
new_enemy.y_v = 5;
new_enemy.y_a = -0.02;
new_enemy.cd = 70;
enemies.push(new_enemy);
}
break;
case 1910:
for(var i=0;i<2;++i){
var new_enemy = Object.assign({},enemy2);
new_enemy.x = 300*i+150;
new_enemy.y_v = 2;
new_enemy.y_a = -0.02;
new_enemy.cd = 30;
new_enemy.stopable = true;
enemies.push(new_enemy);
}
break;
case 1900:
case 2060:
case 2220:
for(var i=0;i<3;++i){
var new_enemy = Object.assign({},enemy1);
new_enemy.x = 180*i+40;
new_enemy.y_v = 2.5;
new_enemy.health = 50;
new_enemy.show_width = 80;
new_enemy.show_height = 80;
new_enemy.radius = 40;
enemies.push(new_enemy);
}
break;
case 1980:
case 2140:
case 2300:
for(var i=0;i<3;++i){
var new_enemy = Object.assign({},enemy1);
new_enemy.x = 560-180*i;
new_enemy.y_v = 2.5;
new_enemy.health = 50;
new_enemy.show_width = 80;
new_enemy.show_height = 80;
new_enemy.radius = 40;
enemies.push(new_enemy);
}
break;
case 2310:
game.freeze();
break;
case 2500:
var new_enemy = Object.assign({},enemy3);
new_enemy.x = 300;
new_enemy.y_v = 1.5;
new_enemy.y_a = -0.02;
new_enemy.cd = 50;
new_enemy.stopable = true;
enemies.push(new_enemy);
for(var i=0;i<2;++i){
var new_enemy = Object.assign({},enemy2);
new_enemy.x = 300*i+150;
new_enemy.y_v = 3;
new_enemy.y_a = -0.02;
new_enemy.cd = 50;
new_enemy.stopable = true;
enemies.push(new_enemy);
}
game.freeze();
break;
case 2650:
var new_enemy = Object.assign({},enemy2);
new_enemy.x = 300;
new_enemy.y_v = 2;
new_enemy.y_a = -0.02;
new_enemy.cd = 40;
new_enemy.stopable = true;
enemies.push(new_enemy);
for(var i=0;i<2;++i){
var new_enemy = Object.assign({},enemy3);
new_enemy.x = 600*i;
new_enemy.y = 80;
new_enemy.x_v = (i===0)?2:-2;
new_enemy.cd = 30;
new_enemy.bounceable = true;
enemies.push(new_enemy);
}
game.freeze();
break;
case 2800:
var new_enemy = Object.assign({},enemy3);
new_enemy.x = 300;
new_enemy.y_v = 1;
new_enemy.x_v = 1;
new_enemy.y_a = 0.015;
new_enemy.cd = 40;
new_enemy.health = 300;
new_enemy.bounceable = true;
enemies.push(new_enemy);
game.freeze();
break;
case 3250:
var new_enemy = Object.assign({},enemy4);
new_enemy.x = 300;
new_enemy.y_v = 3;
new_enemy.y_a = -0.02;
enemies.push(new_enemy);
break;
case 3450:
for(var i=0;i<2;++i) {
var new_enemy = Object.assign({},enemy2);
new_enemy.x = 300;
new_enemy.y_v = (i===0)?1.3:2;
new_enemy.y_a = -0.02;
new_enemy.cd = 120;
new_enemy.stopable = true;
new_enemy.loot = 0;
enemies.push(new_enemy);
}
game.freeze();
break;
case 3600:
var list = document.getElementById("list");
list.style.visibility = "visible";
var pass = (main.health>0 ? "Congratulation!" : "You Lose...");
if(main.health<=0){
var gamepoint = 0;
}
else if(game.time<=15000){
var gamepoint = (-(game.time/410)*(game.time/410)+1435.8);
}
else{
var gamepoint = 100;
}
game.total_point = (game.point+Math.round(gamepoint)+main.health*5);
list.innerHTML = pass +
"<br><br>Point: " + game.point +
"<br>Time: " + Math.round(game.time/50) + " sec" +
"<br>Health: " + main.health +
"<br><br>Total Point: " + game.total_point;
break;
}
if(game.ticking) ++game.tick;
if(!game.end) ++game.time;
},20);
}
</script>
</head>
<body onkeydown="keyEvent(event)" onkeyup="keyEventEnd(event)">
<div id="canvas_bg">
<canvas id="canvas" width="600" height="750"></canvas>
<button id="start_button" onclick="start()">START</button>
<img src="img/read.png" style="width:300px;float:left;">
<div id="Point"></div>
<div id="HP"></div>
</div>
<div id="list"></div>
</body>
</html>