From 89d56f0c604c2d985c89386ea375d0f69c809a4d Mon Sep 17 00:00:00 2001
From: mfranz <mfranz>
Date: Tue, 25 Jul 2006 07:07:34 +0000
Subject: [PATCH] define label box pointer via <pointer-width> (width of base)
 and <pointer-length>

---
 src/Instrumentation/HUD/HUD.hxx       |  3 +-
 src/Instrumentation/HUD/HUD_label.cxx | 48 ++++++++++++++++-----------
 2 files changed, 31 insertions(+), 20 deletions(-)

diff --git a/src/Instrumentation/HUD/HUD.hxx b/src/Instrumentation/HUD/HUD.hxx
index 10b7ead58..a52176317 100644
--- a/src/Instrumentation/HUD/HUD.hxx
+++ b/src/Instrumentation/HUD/HUD.hxx
@@ -439,7 +439,8 @@ private:
     int     _blink;
     bool    _box;
     float   _text_y;
-    float   _marker_offset;
+    float   _pointer_width;
+    float   _pointer_length;
 
     SGCondition *_blink_condition;
     double  _blink_interval;
diff --git a/src/Instrumentation/HUD/HUD_label.cxx b/src/Instrumentation/HUD/HUD_label.cxx
index 4b79d4bdd..bed53a63e 100644
--- a/src/Instrumentation/HUD/HUD_label.cxx
+++ b/src/Instrumentation/HUD/HUD_label.cxx
@@ -32,7 +32,8 @@ HUD::Label::Label(HUD *hud, const SGPropertyNode *n, float x, float y) :
     _input(n->getNode("input", false)),
     _fontsize(fgGetInt("/sim/startup/xsize") > 1000 ? FONT_LARGE : FONT_SMALL),		// FIXME
     _box(n->getBoolValue("box", false)),
-    _marker_offset(n->getFloatValue("marker-offset", 5)),
+    _pointer_width(n->getFloatValue("pointer-width", 7.0)),
+    _pointer_length(n->getFloatValue("pointer-length", 5.0)),
     _blink_condition(0),
     _blink_interval(n->getFloatValue("blinking/interval", -1.0f)),
     _blink_target(0.0),
@@ -85,49 +86,58 @@ void HUD::Label::draw(void)
         return;
 
     if (_box) {
-        const float tan30 = 0.57735;
-        float base = _marker_offset * tan30;
         float l, r, p;
+        float pw = _pointer_width / 2.0;
 
-        l = _center_x - base;
-        r = _center_x + base;
+        l = _center_x - pw;
+        r = _center_x + pw;
+        bool draw_parallel = fabsf(_pointer_width - _w) > 2.0; // draw lines left and right of arrow?
 
         if (option_bottom()) {
-            p = _y - _marker_offset;
-            draw_line(_x, _y, l, _y);
+            if (draw_parallel) {
+                draw_line(_x, _y, l, _y);
+                draw_line(r, _y, _x + _w, _y);
+            }
+            p = _y - _pointer_length;
             draw_line(l, _y, _center_x, p);
             draw_line(_center_x, p, r, _y);
-            draw_line(r, _y, _x + _w, _y);
         } else
             draw_line(_x, _y, _x + _w, _y);
 
         if (option_top()) {
-            p = _y + _h + _marker_offset;
-            draw_line(_x, _y + _h, l, _y + _h);
+            if (draw_parallel) {
+                draw_line(_x, _y + _h, l, _y + _h);
+                draw_line(r, _y + _h, _x + _w, _y + _h);
+            }
+            p = _y + _h + _pointer_length;
             draw_line(l, _y + _h, _center_x, p);
             draw_line(_center_x, p, r, _y + _h);
-            draw_line(r, _y + _h, _x + _w, _y + _h);
         } else
             draw_line(_x + _w, _y + _h, _x, _y + _h);
 
-        l = _center_y - base;
-        r = _center_y + base;
+        l = _center_y - pw;
+        r = _center_y + pw;
+        draw_parallel = fabsf(_pointer_width - _h) > 2.0;
 
         if (option_left()) {
-            p = _x - _marker_offset;
-            draw_line(_x, _y, _x, l);
+            if (draw_parallel) {
+                draw_line(_x, _y, _x, l);
+                draw_line(_x, r, _x, _y + _h);
+            }
+            p = _x - _pointer_length;
             draw_line(_x, l, p, _center_y);
             draw_line(p, _center_y, _x, r);
-            draw_line(_x, r, _x, _y + _h);
         } else
             draw_line(_x, _y + _h, _x, _y);
 
         if (option_right()) {
-            p = _x + _w + _marker_offset;
-            draw_line(_x + _w, _y, _x + _w, l);
+            if (draw_parallel) {
+                draw_line(_x + _w, _y, _x + _w, l);
+                draw_line(_x + _w, r, _x + _w, _y + _h);
+            }
+            p = _x + _w + _pointer_length;
             draw_line(_x + _w, l, p, _center_y);
             draw_line(p, _center_y, _x + _w, r);
-            draw_line(_x + _w, r, _x + _w, _y + _h);
         } else
             draw_line(_x + _w, _y, _x + _w, _y + _h);
     }