From 85707f1e49a796282d0ee1b1a79a3c89678069ad Mon Sep 17 00:00:00 2001
From: david <david>
Date: Thu, 16 Feb 2006 01:30:28 +0000
Subject: [PATCH] The "constrained" property for a mouse mode now actually
 constrains the mouse rather than wrapping it.  Wrapping around to the other
 side of the screen has very bad consequences when using the mouse for flying
 or viewing -- it can result in sudden jumps in the controls or the viewpoint
 when the mouse jumps to another side of the screen.

Right now, the mouse is constrained to stay between 25% and 75% of the
screen on both the X and Y axis -- whenever it hits an edge, it jumps
back to the centre of the screen again (which causes no control or
view jump).
---
 src/Input/input.cxx | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/src/Input/input.cxx b/src/Input/input.cxx
index 59f27bd89..a95c235fb 100644
--- a/src/Input/input.cxx
+++ b/src/Input/input.cxx
@@ -387,19 +387,13 @@ FGInput::doMouseMotion (int x, int y)
                                 // Constrain the mouse if requested
   if (mode.constrained) {
     bool need_warp = false;
-    if (x <= 0) {
-      x = xsize - 2;
-      need_warp = true;
-    } else if (x >= (xsize-1)) {
-      x = 1;
+    if (x <= (xsize * .25) || x >= (xsize * .75)) {
+      x = int(xsize * .5);
       need_warp = true;
     }
 
-    if (y <= 0) {
-      y = ysize - 2;
-      need_warp = true;
-    } else if (y >= (ysize-1)) {
-      y = 1;
+    if (y <= (ysize * .25) || y >= (ysize * .75)) {
+      y = int(ysize * .5);
       need_warp = true;
     }