From ea73d7f6c78cd38df17a4c3fcebd95fb1da31ca6 Mon Sep 17 00:00:00 2001
From: Ellipse0934 <adityapuranik97@gmail.com>
Date: Wed, 31 Oct 2018 23:38:58 +0530
Subject: [PATCH] Add orientation views to led_matrix()

---
 src/led.jl       | 30 +++++++++++++++++++++++-------
 src/led_extra.jl | 16 ++++++++--------
 2 files changed, 31 insertions(+), 15 deletions(-)

diff --git a/src/led.jl b/src/led.jl
index 9b5259d..5ae9d79 100644
--- a/src/led.jl
+++ b/src/led.jl
@@ -55,9 +55,12 @@ ColorTypes.base_color_type(::Type{RGB565}) = RGB565
 
 
 """
-    led_matrix()
+    led_matrix(orientation::Symbol)
 
-Returns an 8x8 matrix of `RGB565` elements that is memory-mapped to the Sense HAT LED Matrix.
+Returns an 8x8 matrix view of `RGB565` elements that is memory-mapped to the Sense HAT LED Matrix.
+
+Orientation can be set to: default, right, left, invert
+See the example below for usage
 
 While it is possible to invoke the function multiple times (each returning different
 arrays), it is generally preferable to assign it once into a `const` variable so as to
@@ -66,18 +69,31 @@ minimise the number of open file handlers.
 # Example
 
 ```
-using SenseHat
-using ColorTypes
-
 const LED = led_matrix()
 
 LED[:] = SenseHat.JULIA_LOGO
 sleep(3)
-LED[:] = RGB(0,0,0)
+LED[:] .= colorant"blue"
+
+# Make the display upside-down, top points to HDMI connector
+const LED2 = led_matrix(:invert) # Make the display upside-down, top points to HDMI connector
+LED2[:] = SenseHat.JULIA_LOGO
+sleep(3)
+LED2 .= colorant"black"
 ```
 
 """
-led_matrix() = Mmap.mmap(LED_FB_DEVICE[], Array{RGB565,2}, (8,8); grow=false)
+led_matrix(orientation::Symbol) = led_matrix(Val{orientation})
+
+led_matrix() = led_matrix(:default)
+led_matrix(::Type{Val{:default}}) = @view PermutedDimsArray(Mmap.mmap(LED_FB_DEVICE[],
+    Array{RGB565,2}, (8,8); grow=false),(2,1))[:,:];
+led_matrix(::Type{Val{:right}}) = @view Mmap.mmap(LED_FB_DEVICE[],
+    Array{RGB565,2}, (8,8); grow=false)[8:-1:1,:];
+led_matrix(::Type{Val{:left}}) = @view Mmap.mmap(LED_FB_DEVICE[],
+    Array{RGB565,2}, (8,8); grow=false)[:,8:-1:1];
+led_matrix(::Type{Val{:invert}}) = @view PermutedDimsArray(Mmap.mmap(LED_FB_DEVICE[],
+    Array{RGB565,2}, (8,8); grow=false),(2,1))[8:-1:1,8:-1:1];
 
 
 
diff --git a/src/led_extra.jl b/src/led_extra.jl
index 3650650..8c90295 100644
--- a/src/led_extra.jl
+++ b/src/led_extra.jl
@@ -7,12 +7,12 @@ const JULIA_LOGO = begin
     p = RGB565(0.667,0.475,0.757)
     z = RGB565(0.0,0.0,0.0)
 
-    permutedims([z z z z z z z z;
-                 z z z G G z z z;
-                 z z G g g G z z;
-                 z z G g g G z z;
-                 z R R G G P P z;
-                 R r r R P p p P;
-                 R r r R P p p P;
-                 z R R z z P P z], (2,1)) # transpose to correct orientation
+    [z z z z z z z z;
+     z z z G G z z z;
+     z z G g g G z z;
+     z z G g g G z z;
+     z R R G G P P z;
+     R r r R P p p P;
+     R r r R P p p P;
+     z R R z z P P z]; # transpose to correct orientation
 end