黃金交叉點價格-死往交叉點價格 如何編寫程式碼?

// XQ: MACD指標

//MACD指標 買進賣出

value1 = MACD(WeightedClose,12,26,9,value2,value3,value4); //計算MACD DIF,MACD,Osc

Plot1(Value2, "DIF");

Plot2(Value3, "MACD");

Plot3(Value4, "Osc");

if value2 cross Over value3 and value4 > 0 then plot4(low,"B");//假設LOw=125

if value2 cross Under value3 then plot5(high,"S");//假設HIgh=132

value5=plot4;

value6=plot5;

value7=value6-value5;

plot6(value7,"價差");//希望=132-125如何正確編寫?