Example Map function (TODO port to GLSL)

ofmap.cpp

//check for division by zero???
//--------------------------------------------------
float ofMap(float value, float inputMin, float inputMax, float outputMin, float outputMax, bool clamp) {

	if (fabs(inputMin - inputMax) < FLT_EPSILON){
		ofLogWarning("ofMath") << "ofMap(): avoiding possible divide by zero, check inputMin and inputMax: " << inputMin << " " << inputMax;
		return outputMin;
	} else {
		float outVal = ((value - inputMin) / (inputMax - inputMin) * (outputMax - outputMin) + outputMin);

		if( clamp ){
			if(outputMax < outputMin){
				if( outVal < outputMax )outVal = outputMax;
				else if( outVal > outputMin )outVal = outputMin;
			}else{
				if( outVal > outputMax )outVal = outputMax;
				else if( outVal < outputMin )outVal = outputMin;
			}
		}
		return outVal;
	}

}