diff src/DynamicVector.cpp @ 4:4a8e6a6cd224

optimised draw function in dynamic vector class. Added Gaussian lookup but not yet used.

--- a/src/DynamicVector.cpp	Fri Aug 19 02:36:34 2011 +0100
+++ b/src/DynamicVector.cpp	Fri Aug 19 15:53:04 2011 +0100
@@ -17,6 +17,14 @@
 	MAPestimate = 0;
 	offset = 0;
 	scalar = 1;
+	
+	gaussianLookupMean = (double) GAUSSIAN_LOOKUP_LENGTH/2;
+	gaussianLookupStdDev = (double)(GAUSSIAN_LOOKUP_LENGTH/16);
+	double factor = 1.0;//(1.0 / (gaussianLookupStdDev*sqrt(2*PI)) );//1.0;//-1.0/(2*PI*sqrt(gaussianLookupStdDev));
+	for (int i = 0;i < GAUSSIAN_LOOKUP_LENGTH;i++){
+	gaussianLookupTable[i] = factor*exp(-1.0*(i-gaussianLookupMean)*(i-gaussianLookupMean)/(2.0*gaussianLookupStdDev*gaussianLookupStdDev));
+	}
+	
 }
 
 void DynamicVector::copyFromDynamicVector(const DynamicVector& dynamicVec){
@@ -113,14 +121,42 @@
 }
 
 void DynamicVector::addGaussianShape(double mean, double StdDev, double factor){
+	
 	int i;
 	factor *= (1/(StdDev*sqrt(2*PI)));
 	for (i=0;i<array.size();i++){
 		array[i] += factor*exp(-1*(i-mean)*(i-mean)/(2*StdDev*StdDev));
 	}
+	
+	//addGaussianShapeByLookupTable(mean, StdDev, factor);
+}
+
+void DynamicVector::addGaussianShapeByLookupTable(double& mean, double& StdDev, double& factor){
+	int i;
+	int lookupIndex ;
+	factor *= (1/(StdDev*sqrt(2*PI)));
+	for (i=0;i<array.size()-1;i++){
+		lookupIndex = round(getLookupIndex(i, mean, StdDev));
+		array[i] += factor*gaussianLookupTable[lookupIndex];
+	}
 	//printf("ADDED GAUSSIAN SHAPE %i\n", (int)array.size());
 }
 
+double DynamicVector::getLookupIndex(const int& i, const double& mean, const double& StdDev){
+	
+	double Z = ((double)i - mean)/StdDev;
+	double lookupIndex = Z*gaussianLookupStdDev + gaussianLookupMean;
+	
+	if (lookupIndex < 0)
+		lookupIndex = 0;
+	
+	if (lookupIndex >= GAUSSIAN_LOOKUP_LENGTH)
+		lookupIndex = GAUSSIAN_LOOKUP_LENGTH-1;
+	
+//	(i - mean)*(i-mean)*(GAUSSIAN_LOOKUP_LENGTH*GAUSSIAN_LOOKUP_LENGTH/16.0)/(StdDev*StdDev);
+	return lookupIndex;
+}
+
 void DynamicVector::addTriangularShape(double mean, double width, double factor){
 	int i;
 
@@ -172,9 +208,15 @@
 		double stepSize = ofGetWidth() / (double)(maxIndex - minIndex);
 		double screenHeight = ofGetHeight();
 		double maxVal = getMaximum();
-		
-		for (int i = max(1,minIndex+1);i < min(maxIndex, (int)array.size());i++){
-		ofLine (stepSize*(i-1), screenHeight * (1 - array[i-1] / maxVal), stepSize*i, screenHeight * (1 - array[i] / maxVal) );
+		int startInt = max(1,minIndex+1);
+		int endInt = min(maxIndex, (int)array.size());
+		double heightConstant = screenHeight / maxVal;
+		int lastHeightPixel = heightConstant * (1 - array[startInt-1]);
+		int newHeightPixel;
+		for (int i = startInt;i < endInt;i++){
+			newHeightPixel = (int) heightConstant * (1 - array[i]);
+			ofLine (stepSize*(i-1), lastHeightPixel, stepSize*i, newHeightPixel);
+			lastHeightPixel = newHeightPixel;
 		}
 	
 }