some nascent facility for debug UIs

0023-on.keychord_press

@@ -90,6 +90,12 @@ on.keychord_press = function(chord, key)
 		elseif chord == 'S-right' then
 			Viewport.x = Viewport.x + App.screen.width/Viewport.zoom
 			B()
+		elseif chord == 'M-1' then
+			if Debug_draw_fn ~= draw_debug_ui1 then
+				Debug_draw_fn = draw_debug_ui1
+			else
+				Debug_draw_fn = nil
+			end
 		end
 	end
-end
+end

0026-on.draw

@@ -34,4 +34,7 @@ on.draw = function()
 	draw_test_failure_indicator()
 	draw_ticks()
 	draw_menu_bar()
-end
+	if Debug_draw_fn then
+		Debug_draw_fn()
+	end
+end

0113-draw_debug_ui1

@@ -0,0 +1,8 @@
+draw_debug_ui1 = function()
+	local x, y =  App.screen.width/3, App.screen.height/3
+	local w, h = App.screen.width/3, App.screen.height/3
+	App.color{r=1, g=1, b=1}
+	love.graphics.rectangle('fill', x,y, w, h)
+	App.color{r=0, g=0, b=0}
+	love.graphics.rectangle('line', x+10, y+10, w-20, h-20, 5,5)
+end

0114-Debug_draw_fn

@@ -0,0 +1 @@
+Debug_draw_fn = nil