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--- useful_programs [2020/06/03 12:01] – [Other handy functions] emozolyak
+++ useful_programs [2020/07/30 15:07] – atolstov
@@ Line 877: / Line 877: @@
 </code>
+===== Curve handler =====
+Library
+<code lua - curves.lib>
+function GetCurveValue ( curve_register, x_to_find_y  )
+    --[[
+    --Curve handler
+    INPUT:
+        Put curve register as first argument and X coordinate as second.
+    OUTPUT:
+        Get as result status if it is inside curve range of outside(false) and the Y value as second output argument
+    EXAMPLE:
+        curve_status, value = GetCurveValue( "curve_for_current_hour", current_hour )
+    --]]
+    table = cjson.decode( R ( curve_register ) )
+    -- inRangeCurve( table, x_to_find_y )
+    for _, value in ipairs( table ) do --piecewise handler inside range of the curve
+        if ( value.range[1] <= x_to_find_y and x_to_find_y < value.range[2] ) then
+            -- in_range_status, index_curve_piece, y = true, index, curveLinearCalc( x_to_find_y, value.k, value.b )
+            in_range_status, y = true, ( x_to_find_y * value.k + value.b )
+            return in_range_status, y
+        end
+    end
+    if  x_to_find_y < table[1].range[1] then -- behaivior for outside left-sided
+        -- in_range_status, index_curve_piece, y = false, 1, curveLinearCalc( table[1].range[1], table[1].k*0, table[1].b ) --table[1].b
+        in_range_status, index_curve_piece, y = false, 1, ( table[1].range[1] * table[1].k + table[1].b ) --table[1].b
+        return in_range_status, y
+    elseif x_to_find_y > table[#table].range[2] then -- behaivior for outside right-sided
+        -- in_range_status, index_curve_piece, y = false,#table,curveLinearCalc( table[#table].range[2], table[#table].k, table[#table].b ) --table[#table].b
+        in_range_status,  y = false,#table,( table[#table].range[2] * table[#table].k + table[#table].b)
+        return in_range_status, y
+    end
+    return in_range_status, y
+end
+</code>
+Example of usage:
+<code lua - Getter>
+include "curves.lib"
+function main (userId)
+    local t = os.date("*t", os.time())
+    current_hour = tonumber(t.hour)
+    curve_status, y = GetCurveValue( "curve_for_current_hour", current_hour )
+    WriteReg("value_for_current_hour", y)
+end
+</code>