wheel zoom

2 files changed, 8 insertions, 0 deletions

diff --git a/assets/javascripts/rectangles/map/_map.js b/assets/javascripts/rectangles/map/_map.js
index 72901a1..e612c98 100644
--- a/assets/javascripts/rectangles/map/_map.js
+++ b/assets/javascripts/rectangles/map/_map.js
@@ -17,6 +17,11 @@ var map = new function(){
 	}
 
 	base.zoom = 1/8
+	base.zoom_exponent = -3
+	base.set_zoom = function (n) {
+		base.zoom_exponent = n
+		base.zoom = pow(2, base.zoom_exponent)
+	}
 
 	var canvas = document.createElement("canvas")
 	var ctx = window.ctx = canvas.getContext("2d")
diff --git a/assets/javascripts/rectangles/map/ui.js b/assets/javascripts/rectangles/map/ui.js
index e7d2cf7..4e03125 100644
--- a/assets/javascripts/rectangles/map/ui.js
+++ b/assets/javascripts/rectangles/map/ui.js
@@ -99,6 +99,9 @@ map.ui = new function(){
 			intersects[0].height = clamp( ~~(intersects[0].height - delta), 200, 800 )
 			clipper.update()
 		}
+		else {
+			map.set_zoom(map.zoom_exponent - delta/20)
+		}
 	}
 	
 	function rightclick (e){