api: fix cache and limits in gradient color

api/api.lua

@@ -943,11 +943,13 @@ end
 -- return r,g,b and hexcolor
 local gradientcolors = {}
 function pfUI.api.GetColorGradient(perc)
-  -- fallback to black on bad numbers
-  if perc < 0 or perc > 1 then return 0,0,0,"|cff000000" end
+  perc = perc > 1 and 1 or perc
+  perc = perc < 0 and 0 or perc
 
-  if not gradientcolors[perc] then
+  local index = perc
+  if not gradientcolors[index] then
     local r1, g1, b1, r2, g2, b2
+
     if perc <= 0.5 then
       perc = perc * 2
       r1, g1, b1 = 1, 0, 0
@@ -958,22 +960,22 @@ function pfUI.api.GetColorGradient(perc)
       r2, g2, b2 = 0, 1, 0
     end
 
-    local r = r1 + (r2 - r1)*perc
-    local g = g1 + (g2 - g1)*perc
-    local b = b1 + (b2 - b1)*perc
+    local r = round(r1 + (r2 - r1) * perc, 4)
+    local g = round(g1 + (g2 - g1) * perc, 4)
+    local b = round(b1 + (b2 - b1) * perc, 4)
     local h = pfUI.api.rgbhex(r,g,b)
 
-    gradientcolors[perc] = {}
-    gradientcolors[perc].r = r
-    gradientcolors[perc].g = g
-    gradientcolors[perc].b = b
-    gradientcolors[perc].h = h
+    gradientcolors[index] = {}
+    gradientcolors[index].r = r
+    gradientcolors[index].g = g
+    gradientcolors[index].b = b
+    gradientcolors[index].h = h
   end
 
-  return gradientcolors[perc].r,
-    gradientcolors[perc].g,
-    gradientcolors[perc].b,
-    gradientcolors[perc].h
+  return gradientcolors[index].r,
+    gradientcolors[index].g,
+    gradientcolors[index].b,
+    gradientcolors[index].h
 end
 
 -- [ GetNoNameObject ] --