1 files changed, 124 insertions, 0 deletions
diff --git a/org.eclipse.tips.examples/matrixrain/particle.js b/org.eclipse.tips.examples/matrixrain/particle.js
new file mode 100644
index 000000000..d67254fc1
--- /dev/null
+++ b/org.eclipse.tips.examples/matrixrain/particle.js
@@ -0,0 +1,124 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Remain Software
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     wim.jongman@remainsoftware.com - initial API and implementation
+ *******************************************************************************/
+// Copyright 2017 Wim Jongman
+function Particle() {
+
+	this.init = function(first) {
+		this.fTrail = new Array();
+		this.fChar = new Array();
+		this.fOpac = new Array();
+		this.scalar = 10;
+		this.fForce = createVector(0, this.scalar);
+		if (first) {
+			this.active = Math.floor(random(50));
+		}
+		this.alive = 0;
+		this.laneNumber = this.getFreeLane();
+		lanes[this.laneNumber] = true;
+		this.theY = 0;
+		if (first) {
+			this.theY = Math.floor(random(height / 2));
+		}
+		this.pos = createVector(this.laneNumber * this.scalar, this.theY);
+		this.vel = createVector(0, 0);
+		this.acc = createVector(0, 0);
+		this.prv = createVector(0, 0);
+		this.speed = Math.floor(random(10) + 1);
+		this.char = this.getRandomChar();
+		this.fTrail[this.fTrail.length] = this.pos;
+		this.fChar[this.fChar.length] = this.char;
+		this.fOpac[this.fOpac.length] = 255;
+	}
+
+	this.getRandomChar = function() {
+		if (Math.round(random()) == 1) {
+			return char(Math.floor(12458 + random(74)));
+		}
+		return char(Math.floor(47 + random(43)));
+	}
+
+	/**
+	 * Become active after a while.
+	 */
+	this.isActive = function() {
+		if (this.active <= 0) {
+			return true;
+		}
+		this.active--;
+		return false;
+	}
+
+	this.getFreeLane = function() {
+		var numberOfLanes = Math.floor(width / this.scalar);
+		var result = Math.floor(random(numberOfLanes));
+		while (lanes[result] == true) {
+			result = Math.floor(random(numberOfLanes));
+		}
+		return result;
+	}
+
+	this.update = function() {
+		// console.log(this.alive, this.fTrail.length, this.pos.y);
+		if (this.pos.y > height
+				&& (this.alive > 0 && (this.alive + 5) >= this.fTrail.length)) {
+			lanes[this.laneNumber] = false;
+			this.init(false);
+		}
+
+		else if (this.pos.y <= height + 20) {
+			var copy = this.pos.copy();
+			this.fTrail[this.fTrail.length] = copy;
+			this.fChar[this.fChar.length] = this.char;
+			this.fOpac[this.fOpac.length] = 200;
+			this.vel.add(this.acc);
+			this.pos.add(this.vel);
+			this.vel.limit(this.speed);
+			this.acc.mult(0);
+			this.char = this.getRandomChar();
+		}
+	}
+
+	this.getOpacity = function(pos) {
+		var count = this.fOpac[pos];
+		this.fOpac[pos] -= this.speed;
+		if (this.fTrail[pos].y > height) {
+			this.fOpac[pos] = 0;// (this.speed * 100);
+		}
+		if (count > 0 && this.fOpac[pos] <= 0) {
+			this.alive += 2;
+		}
+		return this.fOpac[pos];
+	}
+
+	this.getX = function(pos) {
+		return this.fTrail[pos].x;
+	}
+
+	this.getY = function(pos) {
+		return this.fTrail[pos].y;
+	}
+
+	this.getChar = function(pos) {
+		if (Math.floor(random(10)) == 5) {
+			this.fChar[pos] = this.getRandomChar();
+		}
+		if (pos == 0) {
+			return this.getRandomChar();
+		}
+		return this.fChar[pos];
+	}
+
+	this.applyForce = function() {
+		this.acc.add(this.fForce);
+	}
+
+	this.init(true);
+}
+\ No newline at end of file