comparison src/drawMidiNotes.cpp @ 0:b299a65a3ad0

start project

+/*
+ *  drawMidiNotes.cpp
+ *  midiCannamReader
+ *
+ *  Created by Andrew on 17/07/2011.
+ *  Copyright 2011 QMUL. All rights reserved.
+ *
+ */
+
+#include "drawMidiNotes.h"
+
+drawMidiNotes::drawMidiNotes(){
+
+	
+	ticksPerScreen = 8000;
+	tickLocation = 0;
+	pulsesPerQuarternote = 240;
+	noteArrayIndex = 0;
+	noteMinimum = 30;
+	noteMaximum = 96;
+	screenWidth = ofGetWidth();
+	screenHeight = ofGetHeight();
+	noteHeight = screenHeight / (float)(noteMaximum - noteMinimum);
+}
+
+void drawMidiNotes::reset(){
+	noteArrayIndex = 0;
+	tickLocation = 0;
+	lastPeriodUpdateTime = ofGetElapsedTimeMillis();
+	
+}
+
+void drawMidiNotes::updatePlayPosition(){
+	double timeDifference = ofGetElapsedTimeMillis() - lastPeriodUpdateTime;
+	//this is time diff in milliseconds
+	//then we have 
+	double quarterNoteIntervals = (timeDifference / period);
+	tickLocation = quarterNoteIntervals * pulsesPerQuarternote; 
+
+}
+
+void drawMidiNotes::drawFile(const IntMatrix& noteOnMatrix){
+	int size = noteOnMatrix.size();
+	if (size > 0){
+
+		int numberOfScreensIn = tickLocation / ticksPerScreen;
+		
+	while (noteArrayIndex < noteOnMatrix.size() && tickLocation > noteOnMatrix[noteArrayIndex][0] )
+		noteArrayIndex++;
+	
+	while (noteArrayIndex > 0 && noteArrayIndex < size && tickLocation < noteOnMatrix[noteArrayIndex][0])
+		noteArrayIndex--;
+		
+		//need to start where we currently are in file
+		int maxNoteIndexToPrint	= noteArrayIndex;
+		int minNoteIndexToPrint = noteArrayIndex;
+		
+		
+		while (maxNoteIndexToPrint < noteOnMatrix.size() && noteOnMatrix[maxNoteIndexToPrint][0] < (numberOfScreensIn+1)*ticksPerScreen )
+			maxNoteIndexToPrint++;
+		
+		while (minNoteIndexToPrint > 0 && minNoteIndexToPrint < size && noteOnMatrix[minNoteIndexToPrint][0] > numberOfScreensIn*ticksPerScreen)
+			minNoteIndexToPrint--;
+		
+		
+		for (int tmpIndex = minNoteIndexToPrint;tmpIndex < maxNoteIndexToPrint;tmpIndex++){
+		int xLocation = (float)(noteOnMatrix[tmpIndex][0] - numberOfScreensIn*ticksPerScreen)*screenWidth/(float)ticksPerScreen;
+			int duration = (float)(noteOnMatrix[tmpIndex][3]*screenWidth)/(float)ticksPerScreen;
+			
+			
+		int yLocation = screenHeight - ((noteOnMatrix[tmpIndex][1] - noteMinimum )*screenHeight/ (float)(noteMaximum - noteMinimum));						 
+		ofRect(xLocation,yLocation, duration,  noteHeight);
+		
+		}
+		
+			int xLocation = (float)(tickLocation - numberOfScreensIn*ticksPerScreen)*screenWidth/(float)ticksPerScreen;
+		ofLine(xLocation, 0, xLocation, screenHeight);
+	
+	//	if (noteArrayIndex < size )
+	//		printf("tick %i :: note array :%i: %i\n", tickLocation, noteArrayIndex, noteOnMatrix[noteArrayIndex][0]);
+	//	else
+	//		printf("end of file\n");
+
+		
+	}	
+		
+}