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script.js
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script.js
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var canvas = document.querySelector('canvas');
var div = document.getElementById('window');
var internalDiv = document.getElementById('hud');
var divCanvas = document.getElementById('canvas');
var slider = document.getElementById("myRange");
canvas.style.marginTop = (div.clientHeight/5.058) + 'px';
canvas.width = (div.clientWidth/2.11);
canvas.height = (div.clientHeight/1.60);
internalDiv.style.width = (div.clientWidth/1.9) + 'px';
internalDiv.style.height = (div.clientHeight/1.60 + 'px');
var planetList = new Array();
var attractPlanetList = new Array();
var c = canvas.getContext('2d');
var mouseHoldTimeout;
var mouseDownDone = false;
var staticPlanet = false;
var attractPlanet = false;
canvas.addEventListener('click', function(event) {
staticPlanetCheck()
attractPlanetCheck()
var rect = canvas.getBoundingClientRect();
var x = event.clientX - rect.left;
var y = event.clientY - rect.top;
if (!document.getElementById('destroy').checked) {
if (mouseHoldTimeout) {
clearTimeout(mouseHoldTimeout);
mouseHoldTimeout = null;
}
if (mouseDownDone) {
mouseDownDone = false;
return;
}
createPlanet(x,y,slider.value,!staticPlanet)
} else {
planetList.forEach(planet => {
collision = new Planet(x,y,0,0,100000,false)
collision.radius = 1;
planet.ballCollision(collision)
});
}
}, false);
var startPoint = new Vector(0,0);
var endPoint = new Vector(0,0);
var buildLine;
canvas.addEventListener('mousedown', function(event) {
mouseHoldTimeout = setTimeout(() => {
if (!document.getElementById('destroy').checked) {
mouseDownDone = true;
var rect = canvas.getBoundingClientRect();
var x = event.clientX - rect.left;
var y = event.clientY - rect.top;
startPoint = new Vector(x,y)
endPoint = new Vector(x,y)
createPlanet(x,y,slider.value,false)
buildLine = true;
}
}, 100);
}, false);
canvas.addEventListener('mousemove', function(event) {
var rect = canvas.getBoundingClientRect();
var x = event.clientX - rect.left;
var y = event.clientY - rect.top;
endPoint = new Vector(x,y)
}, false);
canvas.addEventListener('mouseup', function(event) {
staticPlanetCheck()
attractPlanetCheck()
if (buildLine && !document.getElementById('destroy').checked) {
var distanceX = endPoint.x-startPoint.x
var distanceY = endPoint.y-startPoint.y
var velocityX = distanceX/50
var velocityY = distanceY/50
startPoint = new Vector(0,0)
endPoint = new Vector(0,0)
planetList[planetList.length-1].movable = !staticPlanet;
planetList[planetList.length-1].changeVelocity(velocityX,velocityY)
buildLine = false;
}
}, false);
function staticPlanetCheck() {
if (document.getElementById("static").checked) {
staticPlanet = true;
} else {
staticPlanet = false;
}
}
function attractPlanetCheck() {
if (document.getElementById("attract").checked) {
attractPlanet = true;
} else {
attractPlanet = false;
}
}
function createPlanet(x,y,mass,movable) {
var planet = new Planet(x,y,0,0,mass,movable)
planetList.push(planet)
if (attractPlanet) {
attractPlanetList.push(planet)
}
}
function gravity(planet) {
attractPlanetList.forEach(attractPlanet => {
if (planet.movable === true && planet != attractPlanet && !attractPlanet.destroyed && !planet.destroyed) {
planet.ballCollision(attractPlanet)
var mass1 = planet.mass
var mass2 = attractPlanet.mass
var g = 6.67408 * Math.pow(-10,-1)
var dirForce = (Vector.substract(planet.position,attractPlanet.position))
dirForce = Vector.normalize(dirForce)
var force = ((mass1*mass2*10)/Math.pow(Vector.distance(planet.position,attractPlanet.position),2))*g
var accelerationX = (Vector.multiply(dirForce,force).x)/mass1
var accelerationY = (Vector.multiply(dirForce,force).y)/mass1
planet.changeVelocity(accelerationX,accelerationY)
}
})
}
function draw() {
c.clearRect(0,0,canvas.width,canvas.height)
planetList.forEach(planet => {
gravity(planet)
var wallCollision = document.getElementById("wall").checked;
planet.borderCollision(canvas.width, canvas.height, wallCollision)
planet.draw()
});
}
function drawLine() {
if (buildLine) {
var x1,x2,y1,y2
x1 = startPoint.x;
y1 = startPoint.y;
x2 = endPoint.x;
y2 = endPoint.y;
c.beginPath();
c.moveTo(x1,y1);
c.lineTo(x2,y2);
c.strokeStyle = "rgb(20, 152, 222)"
c.stroke();
}
}
var output = document.getElementById("output");
output.innerHTML = slider.value;
slider.oninput = function() {
output.innerHTML = this.value;
}
setInterval(draw, 10)
setInterval(drawLine, 10)