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| transfering SAR value to a custom indicator |
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iulian
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| Post subject: transfering SAR value to a custom indicator |
Post rating: 0
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Posted: Thu 29 Dec, 2011, 00:59
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User rating: 1
Joined: Wed 06 Jul, 2011, 23:12
Posts: 42
Location: Romania, Bucharest
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Dear API support, I am trying to create an indicator derived from SAR. For this, I need to pass SAR value to my custom indicator and to perform additional calculation to that value. In order to access values of the SAR indicator I use the framework bellow but unfortunately I can't get it to work. Can you please look into it and tell me what's wrong? I get this error message: "23:53:52 Error in indicator: java.lang.ArrayIndexOutOfBoundsException: 2 @ SAR1.calculate(SAR1.java:54)" Thank you! import com.dukascopy.api.IBar;
import com.dukascopy.api.ITick;
import com.dukascopy.api.OfferSide;
import com.dukascopy.api.indicators.IDrawingIndicator;
import com.dukascopy.api.indicators.IIndicator;
import com.dukascopy.api.indicators.IIndicatorContext;
import com.dukascopy.api.indicators.IIndicatorDrawingSupport;
import com.dukascopy.api.indicators.IMinMax;
import com.dukascopy.api.indicators.IndicatorInfo;
import com.dukascopy.api.indicators.IndicatorResult;
import com.dukascopy.api.indicators.InputParameterInfo;
import com.dukascopy.api.indicators.OptInputParameterInfo;
import com.dukascopy.api.indicators.OutputParameterInfo;
import com.dukascopy.api.indicators.DoubleRangeDescription;
import com.dukascopy.api.indicators.IntegerRangeDescription;
public class SAR1 implements IIndicator
{
private static final int OPEN = 0;
private static final int CLOSE = 1;
private static final int HIGH = 2;
private static final int LOW = 3;
//private static final int VOLUME = 4;
private IIndicator sarIndicator;
private double[] sar_custom;
private IndicatorInfo indicatorInfo;
private InputParameterInfo[] inputParameterInfos;
private OutputParameterInfo[] outputParameterInfos;
private OptInputParameterInfo[] optInputParameterInfos;
private double[][] inputs = new double[1][];
private double[][] outputs = new double[1][];
public void onStart(IIndicatorContext context)
{
indicatorInfo = new IndicatorInfo("SAR1", "SAR1", "Custom", true, false, true, 1, 0, 1);
inputParameterInfos = new InputParameterInfo[] {new InputParameterInfo("Input data", InputParameterInfo.Type.DOUBLE)};
sarIndicator = context.getIndicatorsProvider().getIndicator("SAR");
outputParameterInfos = new OutputParameterInfo[] {
new OutputParameterInfo("SAR1", OutputParameterInfo.Type.DOUBLE, OutputParameterInfo.DrawingStyle.LINE)
{{
setShowValueOnChart(true);
}},
};
}
public IndicatorResult calculate(int startIndex, int endIndex)
{
int start = startIndex;
int outputLen = endIndex - start;
sarIndicator.setInputParameter(0, inputs);
sarIndicator.setOptInputParameter(0, 0.0003);
sarIndicator.setOptInputParameter(1, 0.2);
sar_custom = new double[outputLen];
sarIndicator.setOutputParameter(0, sar_custom);
sarIndicator.calculate(startIndex, endIndex);
for(int i = startIndex; i <= endIndex; i++)
{
outputs[0][i] = sar_custom[i];
}
return new IndicatorResult(startIndex, endIndex);
}
public IndicatorInfo getIndicatorInfo() {
return indicatorInfo;
}
public InputParameterInfo getInputParameterInfo(int index) {
if (index <= inputParameterInfos.length) {
return inputParameterInfos[index];
}
return null;
}
public int getLookback() {
return 0;
}
public int getLookforward() {
return 0;
}
public OutputParameterInfo getOutputParameterInfo(int index) {
if (index <= outputParameterInfos.length) {
return outputParameterInfos[index];
}
return null;
}
public void setInputParameter(int index, Object array) {
inputs[index] = (double[]) array;
}
public OptInputParameterInfo getOptInputParameterInfo(int index) {
if (index <= optInputParameterInfos.length) {
return optInputParameterInfos[index];
}
return null;
}
public void setOptInputParameter(int index, Object value) {
switch (index) {
default:
throw new ArrayIndexOutOfBoundsException(index);
}
}
public void setOutputParameter(int index, Object array) {
outputs[index] = (double[]) array;
}
}
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API Support
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| Post subject: Re: transfering SAR value to a custom indicator |
Post rating: 0
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Posted: Thu 29 Dec, 2011, 13:47
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User rating: ∞
Joined: Fri 31 Aug, 2007, 09:17
Posts: 6139
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This is fixed indicator: package jforex.indicators;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.TimeZone;
import com.dukascopy.api.IBar;
import com.dukascopy.api.ITick;
import com.dukascopy.api.OfferSide;
import com.dukascopy.api.IConsole;
import com.dukascopy.api.indicators.IDrawingIndicator;
import com.dukascopy.api.indicators.IIndicator;
import com.dukascopy.api.indicators.IIndicatorContext;
import com.dukascopy.api.indicators.IIndicatorDrawingSupport;
import com.dukascopy.api.indicators.IMinMax;
import com.dukascopy.api.indicators.IndicatorInfo;
import com.dukascopy.api.indicators.IndicatorResult;
import com.dukascopy.api.indicators.InputParameterInfo;
import com.dukascopy.api.indicators.OptInputParameterInfo;
import com.dukascopy.api.indicators.OutputParameterInfo;
import com.dukascopy.api.indicators.DoubleRangeDescription;
import com.dukascopy.api.indicators.IntegerRangeDescription;
public class SAR1 implements IIndicator
{
private static final int OPEN = 0;
private static final int CLOSE = 1;
private static final int HIGH = 2;
private static final int LOW = 3;
//private static final int VOLUME = 4;
private IIndicator sarIndicator;
private double[] sar_custom;
private IndicatorInfo indicatorInfo;
private InputParameterInfo[] inputParameterInfos;
private OutputParameterInfo[] outputParameterInfos;
private OptInputParameterInfo[] optInputParameterInfos;
private double[][] inputs;
private double[][] outputs = new double[1][];
private IConsole console;
public void onStart(IIndicatorContext context)
{
this.console = context.getConsole();
sarIndicator = context.getIndicatorsProvider().getIndicator("SAR");
// set the parameters of SAR, needed for calculating lookback
sarIndicator.setOptInputParameter(0, 0.0003);
sarIndicator.setOptInputParameter(1, 0.2);
indicatorInfo = new IndicatorInfo("SAR1", "SAR1", "Custom", true, false, true, 1, 0, 1);
// changed to InputParameterInfo.Type.PRICE, since SAR requires PRICE input, not DOUBLE
inputParameterInfos = new InputParameterInfo[] {new InputParameterInfo("Input data", InputParameterInfo.Type.PRICE)};
outputParameterInfos = new OutputParameterInfo[] {
new OutputParameterInfo("SAR1", OutputParameterInfo.Type.DOUBLE, OutputParameterInfo.DrawingStyle.LINE),
};
}
public IndicatorResult calculate(int startIndex, int endIndex)
{
// setting startIndex to take into account the lookback of SAR
if (startIndex - getLookback() < 0) {
startIndex -= startIndex - getLookback();
}
if (startIndex > endIndex) {
return new IndicatorResult(0, 0);
}
int len = endIndex - startIndex + 1;
sarIndicator.setInputParameter(0, inputs);
sar_custom = new double[len];
sarIndicator.setOutputParameter(0, sar_custom);
sarIndicator.calculate(startIndex, endIndex);
for (int i = 0; i < len; i++) {
outputs[0][i] = sar_custom[i];
}
return new IndicatorResult(startIndex, len);
}
public IndicatorInfo getIndicatorInfo() {
return indicatorInfo;
}
public InputParameterInfo getInputParameterInfo(int index) {
if (index <= inputParameterInfos.length) {
return inputParameterInfos[index];
}
return null;
}
// need to set lookback
public int getLookback() {
return sarIndicator.getLookback();
}
public int getLookforward() {
return 0;
}
public OutputParameterInfo getOutputParameterInfo(int index) {
if (index <= outputParameterInfos.length) {
return outputParameterInfos[index];
}
return null;
}
public void setInputParameter(int index, Object array) {
inputs = (double[][]) array;
}
public OptInputParameterInfo getOptInputParameterInfo(int index) {
if (index <= optInputParameterInfos.length) {
return optInputParameterInfos[index];
}
return null;
}
public void setOptInputParameter(int index, Object value) {
switch (index) {
default:
throw new ArrayIndexOutOfBoundsException(index);
}
}
public void setOutputParameter(int index, Object array) {
outputs[index] = (double[]) array;
}
// ________________________________
// Support: Some helper methods for printing
private void print(Object... o) {
for (Object ob : o) {
console.getOut().print(ob + " ");
}
console.getOut().println();
}
private void print(Object o) {
console.getOut().println(o);
}
private void print(double[] arr) {
print(arrayToString(arr));
}
private void print(double[][] arr) {
print(arrayToString(arr));
}
private void printIndicatorInfos(IIndicator ind) {
for (int i = 0; i < ind.getIndicatorInfo().getNumberOfInputs(); i++) {
print(ind.getIndicatorInfo().getName() + " Input " + ind.getInputParameterInfo(i).getName() + " " + ind.getInputParameterInfo(i).getType());
}
for (int i = 0; i < ind.getIndicatorInfo().getNumberOfOptionalInputs(); i++) {
print(ind.getIndicatorInfo().getName() + " Opt Input " + ind.getOptInputParameterInfo(i).getName() + " " + ind.getOptInputParameterInfo(i).getType());
}
for (int i = 0; i < ind.getIndicatorInfo().getNumberOfOutputs(); i++) {
print(ind.getIndicatorInfo().getName() + " Output " + ind.getOutputParameterInfo(i).getName() + " " + ind.getOutputParameterInfo(i).getType());
}
}
public static String arrayToString(double[] arr) {
String str = "";
for (int r = 0; r < arr.length; r++) {
str += "[" + r + "] " + (new DecimalFormat("#.#######")).format(arr[r]) + "; ";
}
return str;
}
public static String arrayToString(double[][] arr) {
String str = "";
if (arr == null)
return "null";
for (int r = 0; r < arr.length; r++) {
for (int c = 0; c < arr[r].length; c++) {
str += "[" + r + "][" + c + "] " + (new DecimalFormat("#.#######")).format(arr[r][c]);
}
str += "; ";
}
return str;
}
public String toDecimalToStr(double d) {
return (new DecimalFormat("#.#######")).format(d);
}
public String dateToStr(long time) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss") {
{
setTimeZone(TimeZone.getTimeZone("GMT"));
}
};
return sdf.format(time);
}
// ________________________________
}
| Attachments: |
SAR1.java [6.83 KiB]
Downloaded 307 times
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iulian
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| Post subject: Re: transfering SAR value to a custom indicator |
Post rating: 0
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Posted: Thu 29 Dec, 2011, 14:06
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User rating: 1
Joined: Wed 06 Jul, 2011, 23:12
Posts: 42
Location: Romania, Bucharest
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Thank you for the fix and for the additional methods!
Happy New Year!
Iulian
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