From b6edd7be7bb27302daba61b8b549b2c57ec641c3 Mon Sep 17 00:00:00 2001
From: Philip Rosedale <philip@highfidelity.io>
Date: Tue, 11 Feb 2014 15:07:25 -0800
Subject: [PATCH] add Vec3::subtract in JS

---
 examples/editVoxels.js               | 52 ++++++++++++++++++++++++++--
 libraries/script-engine/src/Vec3.cpp |  4 +++
 libraries/script-engine/src/Vec3.h   |  1 +
 3 files changed, 55 insertions(+), 2 deletions(-)

diff --git a/examples/editVoxels.js b/examples/editVoxels.js
index 81f5e09ddd..cf7736c5bc 100644
--- a/examples/editVoxels.js
+++ b/examples/editVoxels.js
@@ -27,16 +27,30 @@ function vMinus(a, b) {
 
 var NEW_VOXEL_SIZE = 1.0;
 var NEW_VOXEL_DISTANCE_FROM_CAMERA = 3.0;
+var ORBIT_RATE_ALTITUDE = 100.0;
+var ORBIT_RATE_AZIMUTH = 60.0;
+
+var oldMode = Camera.getMode();
 
 var key_alt = false;
 var key_shift = false;
 var isAdding = false; 
+var isOrbiting = false;
+var orbitAzimuth = 0.0;
+var orbitAltitude = 0.0;
+var orbitCenter = { x: 0, y: 0, z: 0 };
+var orbitPosition = { x: 0, y: 0, z: 0 };
+var orbitRadius = 0.0;
 
 var lastVoxelPosition = { x: 0, y: 0, z: 0 };
 var lastVoxelColor = { red: 0, green: 0, blue: 0 };
 var lastVoxelScale = 0;
 var dragStart = { x: 0, y: 0 };
 
+var mouseX = 0;
+var mouseY = 0; 
+
+
 //  Create a table of the different colors you can choose
 var colors = new Array();
 colors[0] = { red: 237, green: 175, blue: 0 };
@@ -72,12 +86,28 @@ function getNewVoxelPosition() {
 }
 
 function mousePressEvent(event) {
+    mouseX = event.x;
+    mouseY = event.y;
     var pickRay = Camera.computePickRay(event.x, event.y);
     var intersection = Voxels.findRayIntersection(pickRay);
     audioOptions.position = Vec3.sum(pickRay.origin, pickRay.direction);
-
     if (intersection.intersects) {
-         if (event.isRightButton || event.isControl) {
+        if (event.isAlt) {
+            // start orbit camera! 
+            oldMode = Camera.getMode();
+            Camera.setMode("independent");
+            isOrbiting = true;
+            Camera.keepLookingAt(intersection.intersection);
+            // get position for initial azimuth, elevation
+            orbitCenter = intersection.intersection; 
+            var cameraPosition = Camera.getPosition();
+            var orbitVector = Vec3.subtract(cameraPosition, orbitCenter);
+            orbitRadius = vLength(orbitVector);
+            print("Orbit radius = " + orbitRadius);
+            orbitAzimuth = Math.atan(orbitVector.z / orbitVector.x);
+            orbitAltitude = Math.atan(orbitVector.y / orbitVector.x);
+
+        } else if (event.isRightButton || event.isControl) {
             //  Delete voxel
             Voxels.eraseVoxel(intersection.voxel.x, intersection.voxel.y, intersection.voxel.z, intersection.voxel.s);
             Audio.playSound(deleteSound, audioOptions);
@@ -175,6 +205,20 @@ function keyReleaseEvent(event) {
     key_shift = false; 
 }
 function mouseMoveEvent(event) {
+    if (isOrbiting) {
+        var dx = event.x - mouseX; 
+        var dy = event.y - mouseY;
+        orbitAzimuth += dx / ORBIT_RATE_AZIMUTH;
+        orbitAltitude += dy / ORBIT_RATE_ALTITUDE;
+        //print("Azimuth, Altitude: " + orbitAzimuth + ", " + orbitAltitude);
+        var orbitVector = { x:(Math.cos(orbitAzimuth) * Math.cos(orbitAltitude)) * orbitRadius, 
+                            y:Math.sin(orbitAltitude) * orbitRadius,
+                            z:(Math.sin(orbitAzimuth) * Math.cos(orbitAltitude)) * orbitRadius }; 
+        orbitPosition = Vec3.sum(orbitCenter, orbitVector);
+        Camera.setPosition(orbitPosition);
+        mouseX = event.x; 
+        mouseY = event.y;
+    }
     if (isAdding) {
         var pickRay = Camera.computePickRay(event.x, event.y);
         var lastVoxelDistance = { x: pickRay.origin.x - lastVoxelPosition.x, 
@@ -218,6 +262,10 @@ function mouseMoveEvent(event) {
 
 function mouseReleaseEvent(event) {
     isAdding = false;
+    isOrbiting = false; 
+    MyAvatar.position = orbitPosition;
+    Camera.stopLooking();
+    Camera.setMode(oldMode);
 }
 
 Controller.mousePressEvent.connect(mousePressEvent);
diff --git a/libraries/script-engine/src/Vec3.cpp b/libraries/script-engine/src/Vec3.cpp
index 87b1b510a4..6520e62a34 100644
--- a/libraries/script-engine/src/Vec3.cpp
+++ b/libraries/script-engine/src/Vec3.cpp
@@ -22,3 +22,7 @@ glm::vec3 Vec3::multiply(const glm::vec3& v1, float f) {
 glm::vec3 Vec3::sum(const glm::vec3& v1, const glm::vec3& v2) {
     return v1 + v2;
 }
+
+glm::vec3 Vec3::subtract(const glm::vec3& v1, const glm::vec3& v2) {
+        return v1 - v2;
+}
diff --git a/libraries/script-engine/src/Vec3.h b/libraries/script-engine/src/Vec3.h
index 1cc44f3061..c6f05fb6aa 100644
--- a/libraries/script-engine/src/Vec3.h
+++ b/libraries/script-engine/src/Vec3.h
@@ -24,6 +24,7 @@ public slots:
     glm::vec3 multiply(const glm::vec3& v1, const glm::vec3& v2);
     glm::vec3 multiply(const glm::vec3& v1, float f);
     glm::vec3 sum(const glm::vec3& v1, const glm::vec3& v2);
+    glm::vec3 subtract(const glm::vec3& v1, const glm::vec3& v2);
 };