From 5ff379c470ea3ae587460fb8206a19235ee4c0de Mon Sep 17 00:00:00 2001
From: Samuli Asmala <samuli.asmala@gmail.com>
Date: Sat, 20 Jul 2019 11:47:25 +0300
Subject: [PATCH] Fix pixel coordinate calculation for rotated displays

Coordinate ranges are from 0 to width-1 (or height-1). This means when calculating the rotation, using `x = this->width - y;` would lead to x of range from `this->width` (when `y=0`) to `1` (when `y=this->width-1`). Thus additional -1 is required to get correct coordinates after rotation and prevent image from clipping.
---
 Arduino UNO/epd2in9/epd2in9/epdpaint.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Arduino UNO/epd2in9/epd2in9/epdpaint.cpp b/Arduino UNO/epd2in9/epd2in9/epdpaint.cpp
index 859b964..1a5b492 100644
--- a/Arduino UNO/epd2in9/epd2in9/epdpaint.cpp	
+++ b/Arduino UNO/epd2in9/epd2in9/epdpaint.cpp	
@@ -118,15 +118,15 @@ void Paint::DrawPixel(int x, int y, int colored) {
           return;
         }
         point_temp = x;
-        x = this->width - y;
+        x = this->width - y - 1;
         y = point_temp;
         DrawAbsolutePixel(x, y, colored);
     } else if (this->rotate == ROTATE_180) {
         if(x < 0 || x >= this->width || y < 0 || y >= this->height) {
           return;
         }
-        x = this->width - x;
-        y = this->height - y;
+        x = this->width - x - 1;
+        y = this->height - y - 1;
         DrawAbsolutePixel(x, y, colored);
     } else if (this->rotate == ROTATE_270) {
         if(x < 0 || x >= this->height || y < 0 || y >= this->width) {
@@ -134,7 +134,7 @@ void Paint::DrawPixel(int x, int y, int colored) {
         }
         point_temp = x;
         x = y;
-        y = this->height - point_temp;
+        y = this->height - point_temp - 1;
         DrawAbsolutePixel(x, y, colored);
     }
 }