AutoTrendLines.efs
EFSLibrary - Discussion Board
File Name: AutoTrendLines.efs
Description:
The Trend lines Automatic indicator plots trend lines at significant high and low points on a chart, helping to determine market direction, breakouts, and market reversals.
Formula Parameters:
- High Swing Strength: 4
- Low Swing Strength: 4
- Length of Rays: 0
- Number Trendlines displayed: 100
- Lookback period (# bars): 100
- Thickness Resistance lines: 1
- Thickness Support lines: 1
- Color Resistance lines: Red
- Color Support lines: Blue
- Display Title Parameters: False
Notes:
Download File:
AutoTrendLines.efs
EFS Code:
/*********************************
Provided By:
eSignal (Copyright c eSignal), a division of Interactive Data
Corporation. 2008. All rights reserved. This sample eSignal
Formula Script (EFS) is for educational purposes only and may be
modified and saved under a new file name. eSignal is not responsible
for the functionality once modified. eSignal reserves the right
to modify and overwrite this EFS file with each new release.
Description:
The Trendlines Automatic indicator plots trendlines at significant high
and low points on a chart, helping to determine market direction, breakouts,
and market reversals.
Version: 1.0 08/08/2008
Notes:
* - -
Formula Parameters: Default:
* High Swing Strength 4
* Low Swing Strength 4
* Length of Rays 0
* Number Trendlines displayed 100
* Lookback period (# bars) 100
* Thickness Resistance lines 1
* Thickness Support lines 1
* Color Resistance lines Red
* Color Support lines Blue
* Display Title Parameters False
**********************************/
var fpArray = new Array();
var LineIndexS = 0;
var LineIndexR = 0;
function preMain() {
setPriceStudy(true);
setStudyTitle("Auto Trend Lines");
setShowCursorLabel(false);
askForInput();
var x=0;
fpArray[x] = new FunctionParameter("SwHiStrength", FunctionParameter.NUMBER);
with(fpArray[x++]){
setName("High Swing Strength");
setLowerLimit(1);
setDefault(4);
}
fpArray[x] = new FunctionParameter("SwLoStrength", FunctionParameter.NUMBER);
with(fpArray[x++]){
setName("Low Swing Strength");
setLowerLimit(1);
setDefault(4);
}
fpArray[x] = new FunctionParameter("LengthRaysLine", FunctionParameter.NUMBER);
with(fpArray[x++]){
setName("Length of Rays");
setLowerLimit(0);
setDefault(0);
}
fpArray[x] = new FunctionParameter("NumberTrendLine", FunctionParameter.NUMBER);
with(fpArray[x++]){
setName("Number Trendlines displayed");
setLowerLimit(1);
setDefault(100);
}
fpArray[x] = new FunctionParameter("BackHistoryViewBars", FunctionParameter.NUMBER);
with(fpArray[x++]){
setName("Lookback period (# bars)");
setLowerLimit(1);
setDefault(100);
}
fpArray[x] = new FunctionParameter("ResistanceThickness", FunctionParameter.NUMBER);
with(fpArray[x++]){
setName("Thickness Resistance lines");
setLowerLimit(1);
setDefault(1);
}
fpArray[x] = new FunctionParameter("SupportThickness", FunctionParameter.NUMBER);
with(fpArray[x++]){
setName("Thickness Support lines");
setLowerLimit(1);
setDefault(1);
}
fpArray[x] = new FunctionParameter("ResistanceColor", FunctionParameter.COLOR);
with(fpArray[x++]){
setName("Color Resistance lines");
setDefault(Color.red);
}
fpArray[x] = new FunctionParameter("SupportColor", FunctionParameter.COLOR);
with(fpArray[x++]){
setName("Color Support lines");
setDefault(Color.blue);
}
fpArray[x] = new FunctionParameter("Parameters", FunctionParameter.BOOLEAN);
with(fpArray[x++]){
setName("Display Title Parameters");
setDefault(false);
}
}
function main(SwHiStrength, SwLoStrength, ResistanceThickness, ResistanceColor, SupportThickness,
SupportColor, LengthRaysLine, NumberTrendLine, BackHistoryViewBars, Parameters) {
var nVal;
var nIndex = 0;
var IndexOld = 0;
var X, X1, X2, Y1, Y2, K;
var nBarState = getBarState();
if(nBarState==BARSTATE_ALLBARS){
setShowTitleParameters(Parameters);
}
if (LineIndexS > NumberTrendLine) {LineIndexS = 1;}
if (LineIndexR > NumberTrendLine) {LineIndexR = 1;}
if(nBarState==BARSTATE_NEWBAR) {
LineIndexS++;
LineIndexR++;
}
nIndex = (SwHiStrength + 1);
nVal = CreateResistance(nIndex, SwHiStrength);
if(nVal == true){
IndexOld = getOldHiPoint(nIndex, SwHiStrength, BackHistoryViewBars);
if (IndexOld != null) {
X1 = -IndexOld;
X2 = -nIndex;
Y1 = high(X1);
Y2 = high(X2);
K = (Y2-Y1) / (X2-X1);
X2 = X2 - Math.round(X1 / 2) + LengthRaysLine;
Y2 = Y1 + K * (X2-X1);
drawLineRelative( X1, Y1, X2, Y2 , PS_SOLID, ResistanceThickness, ResistanceColor, "Res"+LineIndexR );
}
}
nVal = CreateSupport(nIndex, SwHiStrength, NumberTrendLine);
if(nVal == true){
IndexOld = getOldLoPoint(nIndex, SwHiStrength, BackHistoryViewBars);
if (IndexOld != null) {
X1 = -IndexOld;
X2 = -nIndex;
Y1 = low(X1);
Y2 = low(X2);
K = (Y2-Y1) / (X2-X1);
X2 = X2 - Math.round(X1 / 2) + LengthRaysLine;
Y2 = Y1 + K * (X2-X1);
drawLineRelative(X1, Y1, X2, Y2, PS_SOLID, SupportThickness, SupportColor, "Sup"+LineIndexS );
}
}
return null;
}
function CreateResistance(Index, SwHiStrength) {
var Price = high(-Index);
var ResistanceOK = true;
var tmp;
for(var i =(Index + SwHiStrength); i>Index; i--){
tmp = i-SwHiStrength-1;
if(Price < high(-i)) { ResistanceOK = false; }
if(Price < high(-tmp)) {ResistanceOK = false; }
}
if (ResistanceOK == true) {
return true;
} else {
return false;
}
}
function CreateSupport(Index, SwHiStrength) {
var Price = low(-Index);
var ResistanceOK = true;
var tmp;
for(var i =(Index + SwHiStrength); i>Index; i--){
tmp = i-SwHiStrength-1;
if(Price > low(-i)) { ResistanceOK = false; }
if(Price >= low(-tmp)) {ResistanceOK = false; }
}
if (ResistanceOK == true) {
return true;
} else {
return false;
}
}
function getOldHiPoint(Index, SwHiStrength, BackHistoryViewBars){
var i = Index + 1;
var Work = true;
var PriceBarNow = high(-Index);
while(Work == true) {
if (CreateResistance(i, SwHiStrength) == true) {
if(high(-i) > PriceBarNow) { Work = false; }
}
i++;
if (i > BackHistoryViewBars) return;
}
return i - 1;
}
function getOldLoPoint(Index, SwHiStrength, BackHistoryViewBars){
var i = Index + 1;
var Work = true;
var PriceBarNow = low(-Index);
while(Work == true) {
if (CreateSupport(i, SwHiStrength) == true) {
if(low(-i) < PriceBarNow) { Work = false; }
}
i++;
if (i > BackHistoryViewBars) return;
}
return i - 1;
}