From 1be92c8b19cf63890bae3e409a4ede563bae7200 Mon Sep 17 00:00:00 2001
From: Matt Ebb <matt@mke3.net>
Date: Thu, 12 Oct 2006 07:54:32 +0000
Subject: * Added a new empty draw type - single arrow. This can be useful in
 situations where you just need a direction, like a wind or vortex force field
 for example.

---
 source/blender/makesdna/DNA_object_types.h |  1 +
 source/blender/src/buttons_editing.c       |  4 ++--
 source/blender/src/drawobject.c            | 36 ++++++++++++++++++++++++++++++
 3 files changed, 39 insertions(+), 2 deletions(-)

(limited to 'source')

diff --git a/source/blender/makesdna/DNA_object_types.h b/source/blender/makesdna/DNA_object_types.h
index 9cdb5054493..ef43ab72dfc 100644
--- a/source/blender/makesdna/DNA_object_types.h
+++ b/source/blender/makesdna/DNA_object_types.h
@@ -323,6 +323,7 @@ extern Object workob;
 #define OB_ARROWS		1
 #define OB_PLAINAXES	2
 #define OB_CIRCLE		3
+#define OB_SINGLE_ARROW	4
 
 /* boundtype */
 #define OB_BOUND_BOX		0
diff --git a/source/blender/src/buttons_editing.c b/source/blender/src/buttons_editing.c
index 3e03b3deaba..d3169168305 100644
--- a/source/blender/src/buttons_editing.c
+++ b/source/blender/src/buttons_editing.c
@@ -3826,8 +3826,8 @@ static void editing_panel_links(Object *ob)
 				xco, 154, 130,20, 0, 0, 0, 0, 0, "");
 		
 		uiBlockBeginAlign(block);
-		uiDefButC(block, MENU, REDRAWVIEW3D, "Empty Drawtype%t|Arrows%x1|Plain Axes%x2",
-				xco, 128, 140, 20, &ob->empty_drawtype, 0, 0, 0, 0, "Selects the Empty display type");
+		uiDefButC(block, MENU, REDRAWVIEW3D, "Empty Drawtype%t|Arrows%x1|Single Arrow%x4|Plain Axes%x2",
+				xco, 128, 140, 20, &ob->empty_drawtype, 0, 0, 0, 0, "The Empty 3D View display style");
 		uiDefButF(block, NUM, REDRAWVIEW3D, "Size:",
 				xco, 108, 140, 21, &ob->empty_drawsize, 0.01, 10.0, 1, 0, "The size to display the Empty");
 		uiBlockEndAlign(block);
diff --git a/source/blender/src/drawobject.c b/source/blender/src/drawobject.c
index dd82be68af4..2df2e771696 100644
--- a/source/blender/src/drawobject.c
+++ b/source/blender/src/drawobject.c
@@ -256,6 +256,9 @@ static float cube[8][3] = {
 void drawaxes(float size, int flag, char drawtype)
 {
 	int axis;
+	float v1[3]= {0.0, 0.0, 0.0};
+	float v2[3]= {0.0, 0.0, 0.0};
+	float v3[3]= {0.0, 0.0, 0.0};
 	
 	switch(drawtype) {
 	
@@ -273,6 +276,39 @@ void drawaxes(float size, int flag, char drawtype)
 			
 			glEnd();
 		}
+		break;
+	case OB_SINGLE_ARROW:
+	
+		glBegin(GL_LINES);
+		/* in positive z direction only */
+		v1[2]= size;
+		glVertex3fv(v1);
+		glVertex3fv(v2);
+		glEnd();
+		
+		/* square pyramid */
+		glBegin(GL_TRIANGLES);
+		
+		v2[0]= size*0.035; v2[1] = size*0.035;
+		v3[0]= size*-0.035; v3[1] = size*0.035;
+		v2[2]= v3[2]= size*0.75;
+		
+		for (axis=0; axis<4; axis++) {
+			if (axis % 2 == 1) {
+				v2[0] *= -1;
+				v3[1] *= -1;
+			} else {
+				v2[1] *= -1;
+				v3[0] *= -1;
+			}
+			
+			glVertex3fv(v1);
+			glVertex3fv(v2);
+			glVertex3fv(v3);
+			
+		}
+		glEnd();
+		
 		break;
 	case OB_ARROWS:
 	default:
-- 
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