From 326b09773ae658e0848f4171172bbae4c600e5ca Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Thu, 25 Oct 2018 06:56:08 +0000
Subject: Added mouse look to road demo.

---
 xd.c | 58 +++++++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 39 insertions(+), 19 deletions(-)

diff --git a/xd.c b/xd.c
index 703ca4f..29419fb 100644
--- a/xd.c
+++ b/xd.c
@@ -281,7 +281,7 @@ static DemoInfo		demotbl[NO_DEMOS]=
 				UsesPixmap
 			    },
 			    {
-				"Road Demo (LMB toggle culling)",
+				"Road Demo (LMB toggle culling, RMB toggle mouselook)",
 				RoadDemo,
 				UsesPixmap
 			    },
@@ -4333,6 +4333,7 @@ static void RoadDemo(void)
     static double dxi, dyi;
     static int dcount;
     static int cull = TRUE;
+    static int mouselook = FALSE;
 
     int f,r;
     double x, y, z;
@@ -4415,6 +4416,17 @@ static void RoadDemo(void)
 	}
     }
 
+    if (mouse_b&Button3Mask)
+    {
+	static time_t bounce=0;
+
+	if (bounce!=time(NULL))
+	{
+	    mouselook = !mouselook;
+	    bounce=time(NULL);
+	}
+    }
+
     Cls();
 
     x = -ROAD_WIDTH / 2;
@@ -4422,35 +4434,43 @@ static void RoadDemo(void)
     z = 10.0;
     max_y = height;
 
-    ang_x = atan(fabs(road[0].dy) / ROAD_Z_INC);
-
-    if (isnan(ang_x))
+    if (mouselook)
     {
-    	ang_x = 0;
+    	ang_y = -(mouse_x - centre_x);
+    	ang_x = mouse_y - centre_y;
     }
     else
     {
-    	ang_x = DEG(ang_x) * 10.0;
+	ang_x = atan(fabs(road[0].dy) / ROAD_Z_INC);
 
-	if (road[0].dy > 0)
+	if (isnan(ang_x))
 	{
-	    ang_x = -ang_x;
+	    ang_x = 0;
 	}
-    }
+	else
+	{
+	    ang_x = DEG(ang_x) * 10.0;
 
-    ang_y = atan(fabs(road[0].dx) / ROAD_Z_INC);
+	    if (road[0].dy > 0)
+	    {
+		ang_x = -ang_x;
+	    }
+	}
 
-    if (isnan(ang_y))
-    {
-    	ang_y = 0;
-    }
-    else
-    {
-    	ang_y = DEG(ang_y) * 10.0;
+	ang_y = atan(fabs(road[0].dx) / ROAD_Z_INC);
 
-	if (road[0].dx > 0)
+	if (isnan(ang_y))
 	{
-	    ang_y = -ang_y;
+	    ang_y = 0;
+	}
+	else
+	{
+	    ang_y = DEG(ang_y) * 10.0;
+
+	    if (road[0].dx > 0)
+	    {
+		ang_y = -ang_y;
+	    }
 	}
     }
 
-- 
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