058. p5.jsで空間内にどんどん上がる花火の中を移動してみる 01

042をアレンジして打ち上がる花火の中を移動していきます。

http://www.velvet-number.com/p5_test/test039/

var star_system = [];

var fire_num = 600.0;

var camz = -1000.0;

function setup () {

	pixelDensity (displayDensity ());
	createCanvas (windowWidth, windowHeight, WEBGL);
	colorMode (HSB, 100);
	background (0);

}

function draw () {

	background (0, 0, 0);

	ambientLight (0, 0, 10);
	pointLight (0, 0, 0, 0.0, 0.0, camz);

  	camera (0.0, 0.0, camz,
			0.0, 0.0, 0.0,
			0.0, 1.0, 0.0);

	if (frameCount % 10 == 0) {
		star_system.push (new StarSystem (random (-width / 2.0, width / 2.0), random (-200.0, 200.0), camz + random (200.0)));
	}

	for (var i = 0; i < star_system.length; i++) {
		star_system[i].update ();
		if (camz + star_system[i].myz < -4000.0) {
			star_system.splice (i, 1);
		}
	}

	camz -= 70.0;

}

function StarSystem (sx, sy, sz) {

	var stars = [];

	this.myz = -1.0 * sz;

	for (var i = 0; i < fire_num; i++) {
		stars.push (new StarCreate (sx, sy, sz, random (100)));
	}

	this.update = function () {

		for (var i = 0; i < fire_num; i++) {
			stars[i].update ();
			stars[i].render ();
		}

	}

}

function StarCreate (dx, dy, dz, col) {

	this.location = new p5.Vector (dx, dy, dz);
	this.velocity = new p5.Vector (0.0, 0.0, 0.0);
	this.acceleration = new p5.Vector (0.0, 0.0, 0.0);
	this.direction01 = random (-PI, PI);
	this.direction02 = random (-PI, PI);
	this.tmp_x = cos (this.direction01) * sin (this.direction02);
	this.tmp_y = sin (this.direction01);
	this.tmp_z = cos (this.direction01) * cos (this.direction02);
	this.init_force = new p5.Vector (this.tmp_x, this.tmp_y, this.tmp_z);
	this.init_force.mult (random (160.0, 200.0));

	this.update = function () {

		this.init_force.mult (0.2);
		this.acceleration.add (this.init_force);
		this.velocity.add (this.acceleration);
		this.velocity.mult (0.98);
		this.location.add (this.velocity);
		this.acceleration.mult (0.0);

	}

	this.render = function () {

		push ();
		translate (this.location.x, this.location.y, this.location.z);
		noStroke ();
		fill (col, 255, 100);
		box (10);
		pop ();

	}

}

function mousePressed () {

	star_system = [];

	camz = -1000;

}