LSS通道

上下通道表示支撐及壓力，所突破就做多，跌破做空，只限日內交易。

公式參考自：http://rane1220.pixnet.net/blog/post/48867946

#property indicator_chart_window
#property indicator_buffers 1
#property indicator_buffers 2
#property indicator_color1 Red
#property indicator_color2 Yellow

double buffer1[];
double buffer2[];

int init(){
int draw_begin;
SetIndexStyle(0,DRAW_LINE);
SetIndexBuffer(0,buffer1);
SetIndexStyle(1,DRAW_LINE);
SetIndexBuffer(1,buffer2);
return 0;
}

int start(){
int limit = Bars - IndicatorCounted();

for(int i=0; i<limit; i++){
buffer1[i] = LssUp(i);
buffer2[i] = LssDown(i);
}

return 0;
}

double LssUp(int shift){
double upv, buv, dup, lssup;

shift++;
upv = iLow(NULL,0,shift) + (iHigh(NULL,0,shift) - iLow(NULL,0,shift+1) +
   iHigh(NULL,0,shift+1) - iLow(NULL,0,shift+2) +
   iHigh(NULL,0,shift+2) - iLow(NULL,0,shift+3))/3;
buv = iHigh(NULL,0,shift) + (iHigh(NULL,0,shift) - iHigh(NULL,0,shift+1) +
    iHigh(NULL,0,shift+1) - iHigh(NULL,0,shift+2) +
    iHigh(NULL,0,shift+2) - iHigh(NULL,0,shift+3))/3;
dup = iHigh(NULL,0,shift);
lssup = 2*(iHigh(NULL,0,shift) + iLow(NULL,0,shift) + iClose(NULL,0,shift))/3 - iLow(NULL,0,shift);

return (upv+buv+dup+lssup)/4;
}

double LssDown(int shift){
double downv, bdv, ddown, lssdown;

shift++;
downv = iHigh(NULL,0,shift) - (iHigh(NULL,0,shift+1) - iLow(NULL,0,shift) +
      iHigh(NULL,0,shift+2) - iLow(NULL,0,shift+1) +
      iHigh(NULL,0,shift+3) - iLow(NULL,0,shift+2))/3;
bdv = iLow(NULL,0,shift) - (iLow(NULL,0,shift+1) - iLow(NULL,0,shift) +
   iLow(NULL,0,shift+2) - iLow(NULL,0,shift+1) +
   iLow(NULL,0,shift+3) - iLow(NULL,0,shift+2))/3;
ddown = iLow(NULL,0,shift);
lssdown = 2*(iHigh(NULL,0,shift) + iLow(NULL,0,shift) + iClose(NULL,0,shift))/3 - iHigh(NULL,0,shift);

return (downv+bdv+ddown+lssdown)/4;
}