From 6d59518149cd5b2ce4bdd83f30a5f5068be14157 Mon Sep 17 00:00:00 2001
From: Eric Levin <ericrius1@gmail.com>
Date: Mon, 8 Jun 2015 14:02:38 -0700
Subject: [PATCH] added meditative ocean landscape and common utilities file

---
 examples/example/dynamicLandscape.js | 89 ++++++++++++++++++++++++++++
 examples/utilities.js                | 56 +++++++++++++++++
 2 files changed, 145 insertions(+)
 create mode 100644 examples/example/dynamicLandscape.js
 create mode 100644 examples/utilities.js

diff --git a/examples/example/dynamicLandscape.js b/examples/example/dynamicLandscape.js
new file mode 100644
index 0000000000..ad247963fd
--- /dev/null
+++ b/examples/example/dynamicLandscape.js
@@ -0,0 +1,89 @@
+
+//  dynamicLandscape.js
+//  examples
+//
+//  Created by Eric Levin on June 8
+//  Copyright 2015 High Fidelity, Inc.
+//
+//  Meditative ocean landscape
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+
+HIFI_PUBLIC_BUCKET = "http://s3.amazonaws.com/hifi-public/";
+Script.include(HIFI_PUBLIC_BUCKET + 'scripts/utilities.js')
+
+var NUM_ROWS = 10;
+var CUBE_SIZE = 1;
+var cubes = [];
+var cubesSettings = [];
+var time = 0;
+
+var OMEGA = 2.0 * Math.PI/8;
+var RANGE = CUBE_SIZE/2;
+
+var center = Vec3.sum(MyAvatar.position, Vec3.multiply(CUBE_SIZE* 10, Quat.getFront(Camera.getOrientation())));
+
+
+for (var x = 0, rowIndex = 0; x < NUM_ROWS * CUBE_SIZE; x += CUBE_SIZE, rowIndex++) {
+  for (var z = 0, columnIndex = 0; z < NUM_ROWS * CUBE_SIZE; z += CUBE_SIZE, columnIndex++) {
+
+    var baseHeight = map( columnIndex + 1, 1, NUM_ROWS, -CUBE_SIZE * 2, -CUBE_SIZE);
+    var relativePosition = {
+      x: x,
+      y: baseHeight,
+      z: z
+    };
+    var position = Vec3.sum(center, relativePosition);
+    cubes.push(Entities.addEntity({
+      type: 'Box',
+      position: position,
+      dimensions: {
+        x: CUBE_SIZE,
+        y: CUBE_SIZE,
+        z: CUBE_SIZE
+      }
+    }));
+
+    var phase = map( (columnIndex + 1) * (rowIndex + 1), 2, NUM_ROWS * NUM_ROWS, Math.PI * 2, Math.PI * 4);
+    cubesSettings.push({
+      baseHeight: center.y + baseHeight,
+      phase: phase
+    })
+  }
+}
+
+function update(deleteTime) {
+  time += deleteTime;
+  for (var i = 0; i < cubes.length; i++) {
+    var phase = cubesSettings[i].phase;
+    var props = Entities.getEntityProperties(cubes[i]);
+    var newHeight =  Math.sin(time * OMEGA + phase) / 2.0;
+    var hue = map(newHeight, -.5, .5, 0.5, 0.7);
+    var light = map(newHeight, -.5, .5, 0.4, 0.6)
+    newHeight = cubesSettings[i].baseHeight + (newHeight * RANGE);
+    var newVelocityY = Math.cos(time * OMEGA + phase) / 2.0 * RANGE * OMEGA;
+
+    var newPosition = props.position;
+    var newVelocity = props.velocity;
+
+    newPosition.y = newHeight;
+    newVelocity = newVelocityY;
+    Entities.editEntity( cubes[i], {
+      position: newPosition,
+      velocity: props.velocity,
+      color: hslToRgb({hue: hue, sat: 0.7, light: light})
+    });
+  }
+}
+
+function cleanup() {
+  cubes.forEach(function(cube) {
+    Entities.deleteEntity(cube);
+  })
+}
+
+Script.update.connect(update);
+Script.scriptEnding.connect(cleanup)
+
+
diff --git a/examples/utilities.js b/examples/utilities.js
new file mode 100644
index 0000000000..3844e23e14
--- /dev/null
+++ b/examples/utilities.js
@@ -0,0 +1,56 @@
+//  utilities.js
+//  examples
+//
+//  Created by Eric Levin on June 8
+//  Copyright 2015 High Fidelity, Inc.
+//
+//  Common utilities
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+
+function hslToRgb(hslColor) {
+  var h = hslColor.hue;
+  var s = hslColor.sat;
+  var l = hslColor.light;
+  var r, g, b;
+
+  if (s == 0) {
+    r = g = b = l; // achromatic
+  } else {
+    var hue2rgb = function hue2rgb(p, q, t) {
+      if (t < 0) t += 1;
+      if (t > 1) t -= 1;
+      if (t < 1 / 6) return p + (q - p) * 6 * t;
+      if (t < 1 / 2) return q;
+      if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6;
+      return p;
+    }
+
+    var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
+    var p = 2 * l - q;
+    r = hue2rgb(p, q, h + 1 / 3);
+    g = hue2rgb(p, q, h);
+    b = hue2rgb(p, q, h - 1 / 3);
+  }
+
+  return {
+    red: Math.round(r * 255),
+    green: Math.round(g * 255),
+    blue: Math.round(b * 255)
+  };
+
+}
+
+function map(value, min1, max1, min2, max2) {
+  return min2 + (max2 - min2) * ((value - min1) / (max1 - min1));
+}
+
+function randFloat(low, high) {
+  return low + Math.random() * (high - low);
+}
+
+
+function randInt(low, high) {
+  return Math.floor(randFloat(low, high));
+}
\ No newline at end of file