From 5fbdb86740d12afbf97593e351ce8b09fbb8dbea Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Wed, 17 May 2017 09:42:46 +0000
Subject: Added basic catwalk demo.

---
 xd.c | 144 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 143 insertions(+), 1 deletion(-)

(limited to 'xd.c')

diff --git a/xd.c b/xd.c
index bd6f4dc..c64251c 100644
--- a/xd.c
+++ b/xd.c
@@ -165,10 +165,11 @@ static void	CraterDemo(void);
 static void	TriangleDemo(void);
 static void	TriangleDemo2(void);
 static void	FollowDemo(void);
+static void	CatwalkDemo(void);
 
 /* ---------------------------------------- GLOBAL VARS
 */
-#define NO_DEMOS	16
+#define NO_DEMOS	17
 
 static int		demo=NO_DEMOS-1;
 
@@ -256,6 +257,11 @@ static DemoInfo		demotbl[NO_DEMOS]=
 				FollowDemo,
 				UsesPixmap
 			    },
+			    {
+				"Catwalk trench",
+				CatwalkDemo,
+				UsesPixmap
+			    },
 			};
 
 /* ---------------------------------------- X11 VARS
@@ -3750,4 +3756,140 @@ static void FollowDemo(void)
 }
 
 
+/* ---------------------------------------- CATWALK DEMO
+ */
+
+#define TRENCH_X	300
+#define TRENCH_Y_TOP	-200
+#define TRENCH_Y_BOT	100
+#define TRENCH_Z_MAX	10000
+#define TRENCH_Z_MIN	10
+#define TRENCH_CWH	50
+
+static void CatwalkDemo(void)
+{
+    static const int speed=5;
+
+    static unsigned long col[2];
+
+    static Point3D trench_point[8] = 
+    {
+    	{-TRENCH_X, TRENCH_Y_TOP, TRENCH_Z_MAX},	/* 0 */
+    	{TRENCH_X, TRENCH_Y_TOP, TRENCH_Z_MAX},		/* 1 */
+    	{-TRENCH_X, TRENCH_Y_BOT, TRENCH_Z_MAX},	/* 2 */
+    	{TRENCH_X, TRENCH_Y_BOT, TRENCH_Z_MAX},		/* 3 */
+    	{-TRENCH_X, TRENCH_Y_TOP, TRENCH_Z_MIN},	/* 4 */
+    	{TRENCH_X, TRENCH_Y_TOP, TRENCH_Z_MIN},		/* 5 */
+    	{-TRENCH_X, TRENCH_Y_BOT, TRENCH_Z_MIN},	/* 6 */
+    	{TRENCH_X, TRENCH_Y_BOT, TRENCH_Z_MIN}		/* 7 */
+    };
+
+    static Poly3D trench_poly[3] =
+    {
+    	{{2, 3, 7, 6}, 4, 0},
+    	{{1, 5, 7, 3}, 4, 0},
+    	{{0, 2, 6, 4}, 4, 0},
+    };
+
+    static Point3D cw_point[4] =
+    {
+    	{-TRENCH_X, 0, 0},
+    	{TRENCH_X, 0, 0},
+    	{TRENCH_X, TRENCH_CWH, 0},
+    	{-TRENCH_X, TRENCH_CWH, 0}
+
+    };
+
+    static Poly3D cw_poly[1] =
+    {
+    	{{0, 1, 2, 3}, 4, 1}
+    };
+
+    static Point3D trench_work_3d[8];
+    static XPoint trench_work_xp[8];
+
+    static Obj3D trench =
+	{8,3,{0,0,0},trench_point,trench_poly,trench_work_3d,trench_work_xp,
+		0,0,0,MODE_EDGE,-1,True};
+
+    static const int no_catwalk = 5;
+
+    static Obj3D *catwalk;
+
+    static int move=0;
+
+    static int init=FALSE;
+
+    int f,r;
+
+    if (!init)
+    {
+	col[0]=GetCol(255, 255, 255);
+	col[1]=GetCol(255, 255, 0);
+
+	catwalk = Grab(sizeof *catwalk * no_catwalk);
+
+	for(f = 0; f < no_catwalk; f++)
+	{
+	    catwalk[f].no_points = 4;
+	    catwalk[f].no_poly = 1;
+
+	    catwalk[f].origin.x = 0;
+	    catwalk[f].origin.y = RND2(TRENCH_Y_BOT, TRENCH_Y_TOP - TRENCH_CWH);
+	    catwalk[f].origin.z = TRENCH_Z_MAX - 1500 * f;
+
+	    catwalk[f].ps = cw_point;
+	    catwalk[f].poly = cw_poly;
+
+	    catwalk[f].workp3 = Grab(sizeof *catwalk[f].workp3 * 4);
+	    catwalk[f].workxp = Grab(sizeof *catwalk[f].workxp * 4);
+
+	    catwalk[f].x_rot = 0;
+	    catwalk[f].y_rot = 0;
+	    catwalk[f].z_rot = 0;
+
+	    catwalk[f].mode = MODE_EDGE;
+
+	    catwalk[f].col = -1;
+
+	    catwalk[f].cull = True;
+	}
+
+	init=TRUE;
+    }
+
+    Cls();
+
+    DrawObj(&trench,col);
+
+    for(f = 0; f < no_catwalk; f++)
+    {
+	DrawObj(catwalk + f,col);
+
+	catwalk[f].origin.z -= speed;
+    }
+
+    while(catwalk[no_catwalk-1].origin.z < TRENCH_Z_MIN)
+    {
+    	Obj3D t = catwalk[no_catwalk-1];
+
+	for(f = no_catwalk-2; f >= 0; f--)
+	{
+	    catwalk[f+1] = catwalk[f];
+	}
+
+	catwalk[0] = t;
+
+	catwalk[0].origin.z = TRENCH_Z_MAX;
+	catwalk[0].origin.y = RND2(TRENCH_Y_BOT, TRENCH_Y_TOP - TRENCH_CWH);
+    }
+}
+
+#undef TRENCH_X
+#undef TRENCH_Y_TOP
+#undef TRENCH_Y_BOT
+#undef TRENCH_Z_MAX
+#undef TRENCH_Z_MIN
+
+
 /* END OF FILE */
-- 
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