From 1a3fd632504bdd2ead183d617d854db8bd8f1747 Mon Sep 17 00:00:00 2001
From: Andreas Ortmann <ortmann@finf.uni-hannover.de>
Date: Thu, 29 Sep 2016 09:16:34 +0200
Subject: [PATCH] simple (but inefficent) traces added.

---
 .../renderer_polygon_3d.cpp                   | 29 +++++++++++++++++++
 .../renderer_polygon_3d.hpp                   |  2 ++
 2 files changed, 31 insertions(+)

diff --git a/game/renderer_polygon_3d/renderer_polygon_3d.cpp b/game/renderer_polygon_3d/renderer_polygon_3d.cpp
index 75828e6..4b8e066 100644
--- a/game/renderer_polygon_3d/renderer_polygon_3d.cpp
+++ b/game/renderer_polygon_3d/renderer_polygon_3d.cpp
@@ -73,6 +73,8 @@ namespace endofthejedi {
         renderShips();
         renderMissiles();
 
+        renderTraces();
+
         //glDisable(GL_DEPTH_TEST);
         renderParticles();
         //glEnable(GL_DEPTH_TEST);
@@ -244,4 +246,31 @@ namespace endofthejedi {
 
         return model;
     }
+
+    void RendererPolygon3d::renderTraces()
+    {
+        //std::vector<glm::vec2> points;
+        //points.push_back(glm::vec2(0.0, 0.0));
+        //points.push_back(glm::vec2(0.1, 0.02));
+        //points.push_back(glm::vec2(0.2, 0.05));
+        //points.push_back(glm::vec2(0.3, 0.1));
+        //points.push_back(glm::vec2(0.4, 0.2));
+        //points.push_back(glm::vec2(0.5, 0.4));
+        //points.push_back(glm::vec2(0.6, 0.8));
+        //points.push_back(glm::vec2(0.7, 1.0));
+
+        // revert to default
+        glUseProgram(0);
+
+        glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+        glColor3f(0.0, 0.0, 1.0);
+
+        for (const game::Trace *trace : m_state->traces) {
+            glBegin(GL_LINE_STRIP);
+            for (const game::Trace::TracePoint &tp : trace->points) {
+                glVertex2f(tp.position.x, tp.position.y);
+            }
+            glEnd();
+        }
+    }
 }
diff --git a/game/renderer_polygon_3d/renderer_polygon_3d.hpp b/game/renderer_polygon_3d/renderer_polygon_3d.hpp
index 0c30d1a..fea9003 100644
--- a/game/renderer_polygon_3d/renderer_polygon_3d.hpp
+++ b/game/renderer_polygon_3d/renderer_polygon_3d.hpp
@@ -46,6 +46,8 @@ namespace endofthejedi {
             // do the actual computation with these values
             glm::mat4 computeModelMatrix(const glm::vec2 &pos, float scale, float angle=0.0);
 
+            void renderTraces();
+
         private:
             // all models are also here (for easy reloading etc.)
             std::vector<PolygonModel*>  m_models;