From 8693fd830680355d0633d6a4b681386832183b0d Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Mon, 21 Jan 2019 19:42:19 +0100
Subject: Implemented rotate angle is stored seperately, original vectors stay
 untouched. the resulting vectors are calculated in write() with
 applyRotation() to avoid growing rounding errors

---
 cWiremesh.cpp | 49 +++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 43 insertions(+), 6 deletions(-)

(limited to 'cWiremesh.cpp')

diff --git a/cWiremesh.cpp b/cWiremesh.cpp
index 91f92af..085f366 100644
--- a/cWiremesh.cpp
+++ b/cWiremesh.cpp
@@ -3,6 +3,7 @@
 cWiremesh::cWiremesh()
 {
   position = {0,0,0};
+  angle    = {0,0,0};
 }
 
 cWiremesh::~cWiremesh()
@@ -35,9 +36,12 @@ void cWiremesh::write(cRender *_render)
 
   for(long unsigned int i = 0; i < vectors.size(); i++)
   {
+    sCoord3d vorigin    = applyRotation(vectors[i].origin,    angle);
+    sCoord3d vdirection = applyRotation(vectors[i].direction, angle);
+
     _render->drawLine(vectors[i].c,
-          translate(vectors[i].origin + position, origin),
-          translate(vectors[i].origin + vectors[i].direction + position, origin),
+          translate(vorigin + position, origin),
+          translate(vorigin + vdirection + position, origin),
           true, vectors[i].color);
   }
 }
@@ -81,21 +85,54 @@ void cWiremesh::scale(float _scalar)
   }
 }
 
-sCoord3d applyRotation(sCoord3d _vector, sCoord3d _angle)
+sCoord3d cWiremesh::applyRotation(sCoord3d _vector, sCoord3d _angle)
 {
   sCoord3d ret = _vector;
 
+  //Perform some algebra-magic
+  //couldn't be bothered to implement or use a matrix class
+
   if(_angle.x)
   {
-
+    float rads = (float)_angle.x * PI / 180.0;
+
+    ret.y = (int)(
+      (float)_vector.y * cos(rads) -
+      (float)_vector.z * sin(rads)
+    );
+    ret.z = (int)(
+      (float)_vector.y * sin(rads) +
+      (float)_vector.z * cos(rads)
+    );
   }
   if(_angle.y)
   {
-
+    float rads = (float)_angle.y * PI / 180.0;
+    sCoord3d tmp = ret;
+
+    ret.x = (int)(
+      (float)tmp.x * cos(rads) +
+      (float)tmp.z * sin(rads)
+    );
+
+    ret.z = (int)(
+      - (float)tmp.x * sin(rads)
+      + (float)tmp.z * cos(rads)
+    );
   }
   if(_angle.z)
   {
-
+    float rads = (float)_angle.z * PI / 180.0;
+    sCoord3d tmp = ret;
+
+    ret.x = (int) (
+      (float)tmp.x * cos(rads) -
+      (float)tmp.y * sin(rads)
+    );
+    ret.y = (int) (
+      (float)tmp.x * sin(rads) +
+      (float)tmp.y * cos(rads)
+    );
   }
 
   return ret;
-- 
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