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BeatCounterContext.pde
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BeatCounterContext.pde
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public class BeatCounterContext extends ControllerContext {
float firstBeatTime = 0;
float lastBeatTime = 0;
int beatIndex = 0;
float beatTimes[] = new float[4];
float averageBeatLength = 0;
int totalBeatCount = 0;
int lastBeatIndex = 0;
List<MidiButton> beatButtons = new ArrayList<MidiButton>();
public String getName() { return "BeatCounter"; }
public BeatCounterContext(MidiController controller) {
super(controller);
}
public void attach() {
controller.getButtonNamed("Tap Tempo").addNoteOnCallback(new NoteOnCallback() {
public void noteOn(MidiButton button) {
tap();
}
});
controller.getButtonNamed("Nudge -").addNoteOnCallback(new NoteOnCallback() {
public void noteOn(MidiButton button) {
tapFirst();
}
});
beatButtons.add(controller.getButtonNamed("D1"));
beatButtons.add(controller.getButtonNamed("D2"));
beatButtons.add(controller.getButtonNamed("D3"));
beatButtons.add(controller.getButtonNamed("D4"));
}
public void detach() {
//super();
}
public void update() {
int beatIndex = getBeatIndex();
for (int i=0; i<4; ++i) {
beatButtons.get(i).clearColor();
}
beatButtons.get(beatIndex % 4).setColor(1);
}
void tap() {
float beatTime = millis() / 1000.0;
if (firstBeatTime == 0) {
firstBeatTime = beatTime;
lastBeatTime = beatTime;
} else {
if (averageBeatLength != 0) {
float timeSinceFirst = beatTime - firstBeatTime;
float timeSinceLast = beatTime - lastBeatTime;
float beatsSinceFirst = floor(timeSinceFirst / averageBeatLength);
float beatsSinceLast = floor(timeSinceLast / averageBeatLength);
if (beatsSinceLast > 4) {
lastBeatTime = firstBeatTime + beatsSinceFirst * averageBeatLength;
}
}
averageBeatLength = beatTimes[beatIndex++] = beatTime - lastBeatTime;
lastBeatTime = beatTime;
beatIndex %= beatTimes.length;
++totalBeatCount;
}
if (totalBeatCount > 4) {
averageBeatLength = (beatTimes[0]+beatTimes[1]+beatTimes[2]+beatTimes[3]) * 0.25;
}
}
void tapFirst() {
firstBeatTime = millis() / 1000.0;
lastBeatIndex = 0;
}
int getBeatIndex(int multiple) {
if (averageBeatLength == 0) {
return 0;
}
float currentTime = millis() / 1000.0;
float timeSinceFirst = (currentTime - firstBeatTime);
float beatsSinceFirst = floor(multiple * timeSinceFirst / averageBeatLength);
return (int)(beatsSinceFirst) % (4*multiple);
}
int getBeatIndex() {
if (averageBeatLength == 0) {
return 0;
}
float currentTime = millis() / 1000.0;
float timeSinceFirst = (currentTime - firstBeatTime);
float beatsSinceFirst = floor(timeSinceFirst / averageBeatLength);
int beatIndex = (int)(beatsSinceFirst % 4);
if (beatsSinceFirst > lastBeatIndex) {
lastBeatIndex = (int)beatsSinceFirst;
return beatIndex;
}
return lastBeatIndex % 4;
}
}