let cursor = {
'x' : 0,
'y' : 0
};
let canvas;
let context;
let mice;
let explosions;
const drawInterval=20/1000;
let micePerSecond=0.3;
const chargeDepletionRate=200;
let normalMouseSpeed=3;
let normalMouseSize=1;
const maxNumberOfExplosionParticles=20;
const minNumberOfExplosionParticles=5;
const maxParticleSize=50;
const maxExplosionAge=100;
let lastTimeStamp;
let snake = {
'x':window.innerWidth/2,
'y':window.innerHeight/2,
'discharging': false,
'direction' : 0
};
let health=10;
let score=0;
let frameId;
let snakeLaserId;
let charge=0;
const chargeTipoffPoint=10;
function draw(timeStamp)
{
let timeElapsed;
if(lastTimeStamp==undefined)
lastTimeStamp=timeStamp;
timeElapsed=Math.min((timeStamp-lastTimeStamp)/1000,0.1);
lastTimeStamp=timeStamp;
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
/*the only clear thing here is that I am very bad at geometry*/
context.clearRect(0, 0, canvas.width, canvas.height);
drawExplosions(timeElapsed);
drawMice(timeElapsed);
drawSnake(timeElapsed);
drawHealth();
frameId=window.requestAnimationFrame(draw);
}
function drawHealth()
{
context.save();
context.font='48px serif';
context.fillText(`Health: ${health}`,10,70);
context.font='48px serif';
context.fillText(`Score: ${score}/30`,window.innerWidth-48*10,70);
context.restore();
}
function createMouse(x,y,direction,speed,size)
{
return { 'x':x, 'y':y, 'direction':direction, 'speed':speed,'size':size ,'tailLag':0, 'animation':0, 'animationCounter':0, 'hitbox':size*90 };
}
function main()
{
initialise();
frameId=window.requestAnimationFrame(draw);
setInterval(spawnMouse,1000/micePerSecond);
setInterval(cleanUpMice,100);
setInterval(cleanUpBlood,maxExplosionAge);
setInterval(depleteCharge,chargeDepletionRate);
}
function spawnMouse()
{
mice.push(createMouse(5+window.innerWidth*Math.random()*0.9,window.innerHeight+normalMouseSize*90,-Math.PI/2,(normalMouseSpeed*(Math.random()+1)),normalMouseSize*(Math.random()+1)));
}
function initialise()
{
canvas=document.getElementById("canvas1");
context=canvas.getContext("2d");
canvas.addEventListener('mousemove', e => { cursor.x=e.offsetX; cursor.y=e.offsetY; });
canvas.addEventListener('touchmove', e =>
{
cursor.x=e.changedTouches[0].clientX;
cursor.y=e.changedTouches[0].clientY;
});
mice=[];
mice.push(createMouse(200,100,1,normalMouseSpeed,normalMouseSize));
explosions=[];
}
function cleanUpMice()
{
let i=0;
for(i;i<mice.length;++i)
{
if(mice[i].y<-200 || mice[i].y>window.innerHeight+300 || mice[i].x<-100 || mice[i].x>window.innerWidth+300)
{
mice.splice(i,1);
--health;
if(health==0)
{
window.cancelAnimationFrame(frameId);
alert(`Too many of the filthy rats escaped! Your snake has died of despair. Your score is ${score}`);
}
}
else if(mice[i].x-mice[i].hitbox<snake.x && mice[i].x+mice[i].hitbox>snake.x && mice[i].y+mice[i].hitbox>snake.y && mice[i].y-mice[i].hitbox<snake.y)
{
explosions.push( makeExplosion(mice.splice(i,1)[0]));
checkScore();
}
else if(snake.discharging && mouseColidesWithLaserBeam(mice[i]))
{
explosions.push( makeExplosion(mice.splice(i,1)[0]));
checkScore();
}
}
}
function cleanUpBlood()
{
let i=0;
for(i;i<explosions.length;++i)
{
if(explosions[i].animation>maxExplosionAge)
explosions.splice(i,1);
}
}
function drawSnake(timeElapsed)
{
let distance;
let distance2;
let vx;
let vy;
let wx;
let wy;
distance2=Math.sqrt(Math.pow(window.innerWidth/2-snake.x,2) + Math.pow(window.innerHeight/2-snake.y,2))+0.1;
wx=((window.innerWidth/2)-snake.x)/distance2;
gravitate(snake,cursor,true,10000*(timeElapsed/drawInterval),100);
distance=Math.sqrt(Math.pow(window.innerWidth/2-snake.x,2) + Math.pow(window.innerHeight/2-snake.y,2))+0.1;
vx=(window.innerWidth/2-snake.x)/distance;
vy=(window.innerHeight/2-snake.y)/distance;
if(charge>chargeTipoffPoint && snake.discharging==false)
{
snake.discharging=true;
snakeLaserId=setInterval(cleanUpMice,drawInterval);
}else if(snake.discharging==true && charge<=0)
{
snake.discharging=false;
clearInterval(snakeLaserId);
}
if(snake.discharging==true)
{
gravitate(snake,{'x':Math.random()*window.innerWidth,'y':Math.random()*window.innerHeight/4},false,10000*(timeElapsed/drawInterval),1);
charge+=Math.abs(Math.asin(wx)-Math.asin(vx))*0.5;
}else
{
charge+=Math.abs(Math.asin(wx)-Math.asin(vx));
}
context.save();
context.shadowBlur=charge;
context.shadowColor="yellow";
/*body*/
context.beginPath();
context.strokeStyle="#00FF00";
context.moveTo(window.innerWidth/2,-10);
context.bezierCurveTo(
window.innerWidth/2,
window.innerHeight/4,
snake.x+vx*300,
snake.y+vy*100,
snake.x,
snake.y
);
context.lineWidth=40;
context.stroke();
context.closePath();
context.translate(snake.x,snake.y);
snake.direction=Math.atan2(vy,vx);
context.rotate(Math.PI/2+snake.direction);
/*
if(wx>0)
{
snake.direction=Math.acos(wy);
context.rotate(Math.PI-snake.direction);
}else
{
snake.direction=Math.acos(wy);
context.rotate(Math.PI+snake.direction);
}
*/
if(snake.discharging==true)
{
context.beginPath();
context.fillStyle="#FF0000";
context.rect(-15,0,30,10000);
context.fill();
context.closePath();
}
context.strokeStyle="#00FF00";
context.beginPath();
context.fillStyle = "#00FF00";
context.ellipse(0,50,30,70,0,0,3*Math.PI);
context.fill();
context.stroke();
context.closePath();
/*right eye*/
context.beginPath();
context.fillStyle="#FF0000"
context.moveTo(20,80);
context.lineTo(30,80);
context.lineTo(15,100);
context.fill();
context.closePath();
/*right eye*/
context.beginPath();
context.fillStyle="#FF0000"
context.moveTo(-20,80);
context.lineTo(-30,80);
context.lineTo(-15,100);
context.fill();
context.closePath();
context.restore();
}
function drawExplosions(timeElapsed)
{
let i=0;
for(i;i<explosions.length;++i)
{
drawExplosion(explosions[i],timeElapsed);
}
}
function drawExplosion(explosion,timeElapsed)
{
let i=0;
explosion.animation+=timeElapsed/drawInterval;
for(i;i<explosion.particles.length;++i)
{
explosion.particles[i].x+=(1000/explosion.animation)*0.1*Math.cos(explosion.particles[i].direction);
explosion.particles[i].y+=(1000/explosion.animation)*0.1*Math.sin(explosion.particles[i].direction);
context.fillStyle=`rgb(
255,
${Math.floor(255*(explosion.animation/(maxExplosionAge+30)))},
${Math.floor(255*(explosion.animation/(maxExplosionAge+30)))}
)`;
context.rect(
explosion.particles[i].x,
explosion.particles[i].y,
maxParticleSize*explosion.particles[i].size,
maxParticleSize*explosion.particles[i].size,
);
context.fill();
}
}
function drawMice(timeElapsed)
{
let i=0;
for(i;i<mice.length;++i)
{
drawMouse(mice[i],timeElapsed);
}
}
function drawMouse(mouse,timeElapsed)
{
mouse.animationCounter+=drawInterval;
mouse.x+=mouse.speed*(timeElapsed/drawInterval)*Math.cos(mouse.direction);
mouse.y+=mouse.speed*(timeElapsed/drawInterval)*Math.sin(mouse.direction);
mouse.animation+=0.4*(timeElapsed/drawInterval);
if(score>=0)
{
gravitate(mouse,snake,false,(timeElapsed/drawInterval)*500,10);
}
context.save();
context.translate(mouse.x, mouse.y);
context.rotate(mouse.direction);
context.scale(mouse.size,mouse.size);
/*body*/
context.beginPath();
context.ellipse(0,0,90,40,0,0,2*Math.PI);
context.fillStyle = "#8f8f8f";
context.fill();
context.stroke();
context.closePath();
/*right ear*/
context.beginPath();
context.arc(50, 20, 20, 0, Math.PI*1.5, false);
context.fillStyle = "#8f8f8f";
context.fill();
context.stroke();
context.closePath();
/*left ear*/
context.beginPath();
context.arc(50, -22, 20, 0,- Math.PI*1.5, true);
context.fillStyle = "#8f8f8f";
context.fill();
context.stroke();
context.closePath();
/*left eye*/
context.beginPath();
context.ellipse(80,7,5,3,-1/2,0,2*Math.PI);
context.fillStyle = "#000000";
context.fill();
context.closePath();
/*right eye*/
context.beginPath();
context.ellipse(80,-7,5,3,1/2,0,2*Math.PI);
context.fillStyle = "#000000";
context.fill();
context.closePath();
/*right wiskers*/
context.beginPath();
context.moveTo(89,0);
context.lineTo(95,20);
context.stroke();
context.closePath();
context.beginPath();
context.moveTo(89,0);
context.lineTo(90,20);
context.stroke();
context.closePath();
/*left wiskers*/
context.beginPath();
context.moveTo(89,0);
context.lineTo(95,-20);
context.stroke();
context.closePath();
context.beginPath();
context.moveTo(89,0);
context.lineTo(90,-20);
context.stroke();
context.closePath();
/*tail*/
context.beginPath();
context.moveTo(-90,0);
context.bezierCurveTo(-100,0,-150,Math.cos(mouse.animation)*30,-200,Math.sin(mouse.animation)*10);
context.lineWidth+=2;
context.stroke();
context.closePath();
context.restore();
}
function gravitate(subject,gravitas,doesItPull,pullStrength,nearDistance)
{
let distance=Math.sqrt( (subject.x-gravitas.x)*(subject.x-gravitas.x) + (subject.y-gravitas.y)*(subject.y-gravitas.y));
if(distance==0)
{
return ;
}
if(doesItPull==false)
{
subject.x+=(((subject.x-gravitas.x)*pullStrength)/(distance*distance));
subject.y+=(((subject.y-gravitas.y)*pullStrength)/(distance*distance));
}else
{
if(distance<=nearDistance)
{
subject.x=gravitas.x;
subject.y=gravitas.y;
}else
{
subject.x-=(((subject.x-gravitas.x)*pullStrength)/(distance*distance));
subject.y-=(((subject.y-gravitas.y)*pullStrength)/(distance*distance));
}
}
}
function makeExplosion(mouse)
{
let ret={ 'mouse': mouse, 'animation':0, 'particles':[] };
let numberOfParticles=Math.floor(Math.random()*(maxNumberOfExplosionParticles-minNumberOfExplosionParticles))+minNumberOfExplosionParticles;
let i=0;
++score;
for(i;i<numberOfParticles;++i)
{
ret.particles.push({ 'x':mouse.x , 'y':mouse.y, 'direction':Math.random()*2*Math.PI, 'size':Math.random() });
}
return ret;
}
function depleteCharge()
{
charge=Math.max(0,charge-1);
}
function possiblyDischarge()
{
}
function mouseColidesWithLaserBeam(mouse)
{
let vx=(mouse.x-snake.x);
let vy=(mouse.y-snake.y);
let direction=Math.atan2(vy,vx);
if(direction<0)
direction=Math.PI*2+direction;
if(Math.abs(direction-Math.PI-snake.direction)<0.3)
return true;
else
return false;
}
function checkScore()
{
if(score==20 || score==10 || score==5)
{
normalMouseSpeed*=2;
normalMouseSize*=0.7;
setInterval(spawnMouse,1000/micePerSecond);
}
if(score>=30)
{
window.cancelAnimationFrame(frameId);
alert("You are winner!");
}
}
main();