render thumbnails as masks

1 files changed, 13 insertions, 7 deletions

diff --git a/public/assets/javascripts/rectangles/engine/map/draw.js b/public/assets/javascripts/rectangles/engine/map/draw.js
index 07e2d9f..6c27ff1 100644
--- a/public/assets/javascripts/rectangles/engine/map/draw.js
+++ b/public/assets/javascripts/rectangles/engine/map/draw.js
@@ -38,18 +38,24 @@ Map.Draw = function(map, opt){
 		ctx.restore()
 	}
 
+  // changes the ctx temporarily
 	draw.render = function(){
-		// change the ctx temporarily
+		var thumbnail_side = 1000
+		
+		var extent = Rooms.extent()
+		var center = extent.center()
+		var zoom = thumbnail_side / Math.max( extent.width(), extent.height() ) * 0.99
+
 		var canvas = document.createElement("canvas")
 		ctx = canvas.getContext('2d')
-		canvas.width = map.canvas.width
-		canvas.height = map.canvas.height
+		canvas.width = thumbnail_side
+		canvas.height = thumbnail_side
 		
 		draw.clear()
 
-		ctx.translate( map.dimensions.a * 1/2, map.dimensions.b * 1/2)
-		ctx.scale( map.zoom, map.zoom )
-		ctx.translate( map.center.a,  map.center.b )
+		ctx.translate( thumbnail_side * 1/2, thumbnail_side * 1/2)
+		ctx.scale( zoom, zoom )
+		ctx.translate( center.a, -center.b )
 		ctx.scale( -1, 1 )
 
 		draw.regions(Rooms.regions, ["#fff"], null)
@@ -73,7 +79,7 @@ Map.Draw = function(map, opt){
 
 		// reset the ctx
 		ctx = map.canvas.getContext("2d")
-		
+
 		return canvas
 	}