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Tongda letter KDJ indicator line drawing source code, no difficulty. Ask for help to write,
KDJ

RSV:=(CLOSE-LLV (low, 9))/(HHV (high, 9)-LLV (low, 9))* 100, LINETHICK2.

K:SMA(RSV,3, 1),line thick 1;

D:SMA(K,3, 1),LINETHICK2

J:3*K-2*D,LINETHICK 1,COLORRED

Color change: If (BACKSET(K & gt;; 50,K & gt50)、K、DRAWNULL)、LINETHICK2、COLORGREEN