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var ps = [];
var gravity;
var air_resistance = 0.4;
var wid = 800;
var hei = 600;
function setup() {
createCanvas(wid, hei);
colorMode(HSL);
gravity = createVector(0, 5);
}
function draw() {
background(0);
stroke(255);
strokeWeight(4);
line(0, 0.75*hei, 0.25*wid, hei);
line(0.75*wid, hei, wid, 0.75*hei);
for(var i = ps.length - 1; i >= 0; i--) {
ps[i].applyForce(gravity);
ps[i].applyDrag(air_resistance);
ps[i].update();
stroke(ps[i].colour);
strokeWeight(ps[i].mass);
ps[i].show();
if (ps[i].online(0, 0.75*hei, 0.25*wid, hei)) {
ps[i].reflect(createVector(0.25*wid, 0.25*hei), 5);
} else if (ps[i].online(0.75*wid, hei, wid, 0.75*hei)) {
ps[i].reflect(createVector(0.25*wid, -0.25*hei), 5);
}
if (ps[i].pos.y >= hei)
ps.splice(i, 1);
}
if (mouseIsPressed) {
var force = p5.Vector.fromAngle(random(PI, 2*PI));
force.mult(random(250));
var p = new Particle(
mouseX, mouseY, random(2, 10),
color(random(360), random(90, 100), random(50, 100))
);
p.applyForce(force);
ps.push(p);
}
}
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