From 6e140c9cb1c3cb3406295a57488f32e5d6acc288 Mon Sep 17 00:00:00 2001
From: Marc Zinnschlag <marc@zpages.de>
Date: Tue, 13 Oct 2015 11:43:33 +0200
Subject: [PATCH] proper shape for cell arrows (kinda)

---
 apps/opencs/view/render/cellarrow.cpp | 95 ++++++++++++++++++++++-----
 1 file changed, 78 insertions(+), 17 deletions(-)

diff --git a/apps/opencs/view/render/cellarrow.cpp b/apps/opencs/view/render/cellarrow.cpp
index 443d398dd..8f03b489f 100644
--- a/apps/opencs/view/render/cellarrow.cpp
+++ b/apps/opencs/view/render/cellarrow.cpp
@@ -3,10 +3,9 @@
 
 #include <osg/Group>
 #include <osg/PositionAttitudeTransform>
-
-#include <osg/ShapeDrawable>
-#include <osg/Shape>
 #include <osg/Geode>
+#include <osg/Geometry>
+#include <osg/PrimitiveSet>
 
 #include "elements.hpp"
 
@@ -24,37 +23,99 @@ void CSVRender::CellArrow::adjustTransform()
 {
     // position
     const int cellSize = 8192;
-    const int offset = cellSize / 2 + 400;
+    const int offset = cellSize / 2 + 800;
 
     int x = mCoordinates.getX()*cellSize + cellSize/2;
     int y = mCoordinates.getY()*cellSize + cellSize/2;
 
+    float xr = 0;
+    float yr = 0;
+    float zr = 0;
+
+    float angle = osg::DegreesToRadians (90.0f);
+
     switch (mDirection)
     {
-        case Direction_North: y += offset; break;
-        case Direction_West: x -= offset; break;
-        case Direction_South: y -= offset; break;
-        case Direction_East: x += offset; break;
+        case Direction_North: y += offset; xr = -angle; zr = angle; break;
+        case Direction_West: x -= offset; yr = -angle; break;
+        case Direction_South: y -= offset; xr = angle; zr = angle; break;
+        case Direction_East: x += offset; yr = angle; break;
     };
 
     mBaseNode->setPosition (osg::Vec3f (x, y, 0));
 
     // orientation
-    osg::Quat xr (0, osg::Vec3f (1,0,0));
-    osg::Quat yr (0, osg::Vec3f (0,1,0));
-    osg::Quat zr (0, osg::Vec3f (0,0,1));
-    mBaseNode->setAttitude (zr*yr*xr);
+    osg::Quat xr2 (xr, osg::Vec3f (1,0,0));
+    osg::Quat yr2 (yr, osg::Vec3f (0,1,0));
+    osg::Quat zr2 (zr, osg::Vec3f (0,0,1));
+    mBaseNode->setAttitude (zr2*yr2*xr2);
 }
 
 void CSVRender::CellArrow::buildShape()
 {
-    /// \todo placeholder shape -> replace
-    osg::ref_ptr<osg::Box> shape(new osg::Box(osg::Vec3f(0,0,0), 200));
-    osg::ref_ptr<osg::ShapeDrawable> shapedrawable(new osg::ShapeDrawable);
-    shapedrawable->setShape(shape);
+    osg::ref_ptr<osg::Geometry> geometry (new osg::Geometry);
+
+    const int arrowWidth = 4000;
+    const int arrowLength = 1500;
+    const int arrowHeight = 500;
+
+    osg::Vec3Array *vertices = new osg::Vec3Array;
+    for (int i2=0; i2<2; ++i2)
+        for (int i=0; i<2; ++i)
+        {
+            float height = i ? -arrowHeight/2 : arrowHeight/2;
+            vertices->push_back (osg::Vec3f (height, -arrowWidth/2, 0));
+            vertices->push_back (osg::Vec3f (height, arrowWidth/2, 0));
+            vertices->push_back (osg::Vec3f (height, 0, arrowLength));
+        }
+
+    geometry->setVertexArray (vertices);
+
+    osg::DrawElementsUShort *top = new osg::DrawElementsUShort (osg::PrimitiveSet::TRIANGLES, 0);
+    top->push_back (0);
+    top->push_back (1);
+    top->push_back (2);
+    geometry->addPrimitiveSet (top);
+
+    osg::DrawElementsUShort *bottom = new osg::DrawElementsUShort (osg::PrimitiveSet::TRIANGLES, 0);
+    bottom->push_back (5);
+    bottom->push_back (4);
+    bottom->push_back (3);
+    geometry->addPrimitiveSet (bottom);
+
+    osg::DrawElementsUShort *back = new osg::DrawElementsUShort (osg::PrimitiveSet::QUADS, 0);
+    back->push_back (3+6);
+    back->push_back (4+6);
+    back->push_back (1+6);
+    back->push_back (0+6);
+    geometry->addPrimitiveSet (back);
+
+    osg::DrawElementsUShort *side1 = new osg::DrawElementsUShort (osg::PrimitiveSet::QUADS, 0);
+    side1->push_back (0+6);
+    side1->push_back (2+6);
+    side1->push_back (5+6);
+    side1->push_back (3+6);
+    geometry->addPrimitiveSet (side1);
+
+    osg::DrawElementsUShort *side2 = new osg::DrawElementsUShort (osg::PrimitiveSet::QUADS, 0);
+    side2->push_back (4+6);
+    side2->push_back (5+6);
+    side2->push_back (2+6);
+    side2->push_back (1+6);
+    geometry->addPrimitiveSet (side2);
+
+    osg::Vec4Array *colours = new osg::Vec4Array;
+
+    for (int i=0; i<6; ++i)
+        colours->push_back (osg::Vec4f (1.0f, 0.0f, 0.0f, 1.0f));
+    for (int i=0; i<6; ++i)
+        colours->push_back (osg::Vec4f (1.0f, 0.0f, 0.4f, 1.0f));
+
+    geometry->setColorArray (colours);
+    geometry->setColorBinding (osg::Geometry::BIND_PER_VERTEX);
 
     osg::ref_ptr<osg::Geode> geode (new osg::Geode);
-    geode->addDrawable(shapedrawable);
+    geode->addDrawable (geometry);
 
     mBaseNode->addChild (geode);
 }