void UpdateFrequency(float f)
{
int newFreqKnobIndex = (int)(f / frequencyStep);
if (newFreqKnobIndex != lastFreqKnobIndex && newFreqKnobIndex >= 0 && newFreqKnobIndex < knobPositions)
{
string fileName = String.Format("frequencyknob{0:00}.png", newFreqKnobIndex);
var spriteFrame = CCSpriteFrameCache.SharedSpriteFrameCache[fileName];
frequencyKnob.ReplaceTexture(spriteFrame.Texture, spriteFrame.TextureRectInPixels);
lastFreqKnobIndex = newFreqKnobIndex;
if (isSwitchedOn)
{
CocosJuce.Api.StartTestTone(f, 0.8f);
}
frequencyLabel.Text = minFrequency + (newFreqKnobIndex * frequencyStep) + " Hz";
}
}
