From fff63a1f9fbfb1028dec4dbba94e7bb23c07fa20 Mon Sep 17 00:00:00 2001
From: Paul Spencer <pspencer@dmsolutions.ca>
Date: Thu, 17 Jan 2008 16:35:49 +0000
Subject: [PATCH] (Closes #1187.) applying Bart's patch to add a zoom out
 option to the zoom control.  r=pspencer.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@5796 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
---
 lib/OpenLayers/Control/ZoomBox.js | 34 +++++++++++++++++++++++++++----
 1 file changed, 30 insertions(+), 4 deletions(-)

diff --git a/lib/OpenLayers/Control/ZoomBox.js b/lib/OpenLayers/Control/ZoomBox.js
index 6486913085..202f474fd6 100644
--- a/lib/OpenLayers/Control/ZoomBox.js
+++ b/lib/OpenLayers/Control/ZoomBox.js
@@ -20,6 +20,12 @@ OpenLayers.Control.ZoomBox = OpenLayers.Class(OpenLayers.Control, {
      */
     type: OpenLayers.Control.TYPE_TOOL,
 
+    /**
+     * Property: out
+     * {Boolean} Should the control be used for zooming out?
+     */
+    out: false,
+
     /**
      * Method: draw
      */    
@@ -36,16 +42,36 @@ OpenLayers.Control.ZoomBox = OpenLayers.Class(OpenLayers.Control, {
      */
     zoomBox: function (position) {
         if (position instanceof OpenLayers.Bounds) {
-            var minXY = this.map.getLonLatFromPixel(
+            if (!this.out) {
+                var minXY = this.map.getLonLatFromPixel(
                             new OpenLayers.Pixel(position.left, position.bottom));
-            var maxXY = this.map.getLonLatFromPixel(
+                var maxXY = this.map.getLonLatFromPixel(
                             new OpenLayers.Pixel(position.right, position.top));
-            var bounds = new OpenLayers.Bounds(minXY.lon, minXY.lat,
+                var bounds = new OpenLayers.Bounds(minXY.lon, minXY.lat,
                                                maxXY.lon, maxXY.lat);
+            } else {
+                var pixWidth = Math.abs(position.right-position.left);
+                var pixHeight = Math.abs(position.top-position.bottom);
+                var zoomFactor = Math.min((this.map.size.h / pixHeight),
+                    (this.map.size.w / pixWidth));
+                var extent = map.getExtent();
+                var center = this.map.getLonLatFromPixel(
+                    position.getCenterPixel());
+                var xmin = center.lon - (extent.getWidth()/2)*zoomFactor;
+                var xmax = center.lon + (extent.getWidth()/2)*zoomFactor;
+                var ymin = center.lat - (extent.getHeight()/2)*zoomFactor;
+                var ymax = center.lat + (extent.getHeight()/2)*zoomFactor;
+                var bounds = new OpenLayers.Bounds(xmin, ymin, xmax, ymax);
+            }
             this.map.zoomToExtent(bounds);
         } else { // it's a pixel
-            this.map.setCenter(this.map.getLonLatFromPixel(position),
+            if (!this.out) {
+                this.map.setCenter(this.map.getLonLatFromPixel(position),
                                this.map.getZoom() + 1);
+            } else {
+                this.map.setCenter(this.map.getLonLatFromPixel(position),
+                               this.map.getZoom() - 1);
+            }
         }
     },