From 32c954661547c7ca361a97dedaba5e64eab381c7 Mon Sep 17 00:00:00 2001
From: Brandon502 <105077712+Brandon502@users.noreply.github.com>
Date: Fri, 18 Oct 2024 11:49:34 -0400
Subject: [PATCH] Arc - gPC fix

---
 wled00/FX_2Dfcn.cpp | 24 +++++++++++++-----------
 wled00/FX_fcn.cpp   | 20 +++++++++++++++-----
 2 files changed, 28 insertions(+), 16 deletions(-)

diff --git a/wled00/FX_2Dfcn.cpp b/wled00/FX_2Dfcn.cpp
index cc4bad5c5b..f7de58aa0c 100644
--- a/wled00/FX_2Dfcn.cpp
+++ b/wled00/FX_2Dfcn.cpp
@@ -841,17 +841,19 @@ void Segment::drawArc(unsigned x0, unsigned y0, int radius, uint32_t color, uint
   const int starty = max(0, int(y0)-radius-1);
   const int endy = min(height, int(y0)+radius+1);
 
-  for (int x=startx; x<endx; x++) for (int y=starty; y<endy; y++) {
-    int newX2 = x - int(x0); newX2 *= newX2; // (distance from centerX) ^2
-    int newY2 = y - int(y0); newY2 *= newY2; // (distance from centerY) ^2
-    int distance2 = newX2 + newY2;
-
-    if ((distance2 >= minradius2) && (distance2 <= maxradius2)) {
-      setPixelColorXY(x, y, color);
-    } else {
-    if (fillColor != 0)
-      if (distance2 < minradius2)
-        setPixelColorXY(x, y, fillColor);
+  for (int x=startx; x<endx; x++) {
+    int newX2 = x - int(x0); newX2 *= newX2;   // (distance from centerX) ^2
+    for (int y=starty; y<endy; y++) {
+      int newY2 = y - int(y0); newY2 *= newY2; // (distance from centerY) ^2
+      int distance2 = newX2 + newY2;
+
+      if ((distance2 >= minradius2) && (distance2 <= maxradius2)) {
+        setPixelColorXY(x, y, color);
+      } else {
+      if (fillColor != 0)
+        if (distance2 < minradius2)
+          setPixelColorXY(x, y, fillColor);
+      }
     }
   }
 }
diff --git a/wled00/FX_fcn.cpp b/wled00/FX_fcn.cpp
index 099e618c9f..f745c9105b 100644
--- a/wled00/FX_fcn.cpp
+++ b/wled00/FX_fcn.cpp
@@ -873,7 +873,6 @@ uint16_t Segment::virtualLength() const {
         break;
       case M12_pArc:
         vLen = sqrt16(vW * vW + vH * vH);
-        if (vW != vH) vLen++; // round up
         break;
       case M12_jMap: //WLEDMM jMap
         if (jMap)
@@ -957,6 +956,7 @@ void IRAM_ATTR_YN __attribute__((hot)) Segment::setPixelColor(int i, uint32_t co
         if (i==0)
           setPixelColorXY(0, 0, col);
         else {
+          if (i == virtualLength() - 1) setPixelColorXY(vW-1, vH-1, col); // Last i always fill corner
           if (!_isSuperSimpleSegment) { 
             // WLEDMM: drawArc() is faster if it's NOT "super simple" as the regular M12_pArc
             // can do "useSymmetry" to speed things along, but a more complicated segment likey
@@ -1227,10 +1227,20 @@ uint32_t __attribute__((hot)) Segment::getPixelColor(int i) const
           return vW>vH ? getPixelColorXY(i, 0) : getPixelColorXY(0, i); // Corner and Arc
           break;
         }
-        int length = virtualLength();
-        int x = i * vW / length;
-        int y = i * vH / length;
-        return getPixelColorXY(x, y); // Not 100% accurate
+        float minradius = float(i) - .5;
+        const int minradius2 = roundf(minradius * minradius);
+        int startX, startY;
+        if (vW >= vH) {startX = vW - 1; startY = 1;} // Last Column
+        else          {startX = 1; startY = vH - 1;} // Last Row
+
+        // Loop through only last row/column depending on orientation
+        for (int x = startX; x < vW; x++) {
+          int newX2 = x * x;
+          for (int y = startY; y < vH; y++) {
+            int newY2 = y * y;
+            if (newX2 + newY2 >= minradius2) return getPixelColorXY(x, y);        
+          }
+        }
         break;
       }
       case M12_jMap: //WLEDMM jMap