gistfile1.txt

package com.eed3si9n.pikopiko;

import com.eed3si9n.pikopiko.R;
import android.content.Context;
import android.graphics.*;
import android.media.*;
import android.graphics.Paint.Style;

public class PikoPikoEngine {
	private static final int LOCAL_WIDTH = 6;
	private static final int LOCAL_HEIGHT = 8;
	private static final int k_defaultPriority = 1;
	private static final int k_noLoop = 0;
	private static final float k_defaultRate = 1.0f;
	private static final float k_defaultVolume = 0.8f;
	private static final int k_unit = 50;
	private static final int k_margin = 20;
	
	// http://en.wikipedia.org/wiki/Just_intonation
	private static final int SA_CENT = 0;
	private static final int RE_CENT = 204;
	private static final int GA_CENT = 386;
	private static final int MA_CENT = 498;
	private static final int PA_CENT = 702;
	private static final int DHA_CENT = 906;
	private static final int NI_CENT = 1088;
	
	private static Paint s_circlePaint;
	
	private Context m_context;
	private SoundPool m_soundPool;
	private int m_geId;
	private int m_naId;
	private boolean m_initialized;
	private int m_geStreamId;
	private int m_naStreamId;
	private int [] m_geCents;
	
	private static Paint getCirclePaint() {
		if (s_circlePaint == null) {
			s_circlePaint = new Paint();
			s_circlePaint.setAntiAlias(true);
			s_circlePaint.setARGB(100, 100, 100, 100);
			s_circlePaint.setStyle(Style.FILL);
		} // if

		return s_circlePaint;
	}

	public PikoPikoEngine(Context a_context) {
		m_context = a_context;
		m_initialized = false;
		
		m_geCents = new int[7];
		m_geCents[0] = SA_CENT;
		m_geCents[1] = RE_CENT;
		m_geCents[2] = GA_CENT;
		m_geCents[3] = MA_CENT;
		m_geCents[4] = PA_CENT;
		m_geCents[5] = DHA_CENT;
		m_geCents[6] = NI_CENT;
	}

	public void initialize() {
		if (m_initialized) {
			return;
		} // if
		m_initialized = true;
		m_soundPool = new SoundPool(10, AudioManager.STREAM_MUSIC, 0);
		m_naId = m_soundPool.load(m_context, R.raw.na1, k_defaultPriority);
		m_geId = m_soundPool.load(m_context, R.raw.ge1, k_defaultPriority);
	}
	
	public void playGe() {
		playGe(0f);
	}	
	
	public void playGe(float a_rate) {
		initialize();
		
		if (m_geStreamId > 0) {
			m_soundPool.stop(m_geStreamId);
		} // if
		
		m_geStreamId = m_soundPool.play(m_geId, k_defaultVolume, k_defaultVolume,
				k_defaultPriority, k_noLoop, a_rate);
	}
	
	public void modulateGe() {
		initialize();
		if (m_geStreamId == 0) {
			return;
		} // if
		
		try {
			Thread.sleep(10);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} // try-catch
		
		float f = 1.0f;
		for (int i = 0; i < 70; i++) {
			f += 0.01f;
			m_soundPool.setRate(m_geStreamId, f);
			try {
				Thread.sleep(3);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} // for i
		
		m_soundPool.stop(m_geStreamId);
	}

	public void playNa() {
		initialize();
		m_naStreamId = m_soundPool.play(m_naId, k_defaultVolume, k_defaultVolume,
				k_defaultPriority, k_noLoop, k_defaultRate);
	}
	
	private float convertLocalToScreen(int a_value) {
		return a_value * k_unit + k_margin;
	}
	
	private int convertScreenToLocal(int a_value) {
		return (a_value - k_margin) / k_unit;
	}
	
	public void draw(Canvas a_canvas, int a_width, int height) {
		for (int x = 0; x < LOCAL_WIDTH; x++) {
			for (int y = 0; y < LOCAL_HEIGHT; y++) {
				a_canvas.drawRect(convertLocalToScreen(x),
						convertLocalToScreen(y),
						convertLocalToScreen(x) + k_unit - 1,
						convertLocalToScreen(y) + k_unit - 1,
						getCirclePaint());
			} // y
		} // for x

	}
	
	private float centToRate(int a_value) {
		return 1.0f + (a_value / 1200.0f);
	}
	

	private int toPadNumber(int a_xScreen, int a_yScreen) {
		int retval = -1;
		int x = convertScreenToLocal(a_xScreen);
		int y = convertScreenToLocal(a_yScreen);
		if ((x < 0) || (x >= LOCAL_WIDTH)
				|| (y < 0) || (y >= LOCAL_HEIGHT)) {
			return retval;
		} // if
		retval = y * LOCAL_HEIGHT + x;
		return retval;
	}
	
	public void addMove(int a_xScreen, int a_yScreen,
			int a_oldXScreen, int a_oldYScreen) {
		int oldNum = toPadNumber(a_oldXScreen, a_oldYScreen);
		int num = toPadNumber(a_xScreen, a_yScreen);
		if (oldNum == num) {
			return;
		} // if
		
		if (m_geStreamId == 0) {
			return;
		} // if
		
		if ((oldNum >= 0) && (oldNum < 4)
				&& isGe(num)) {
			float rate = centToRate(toGeCent(num));
			m_soundPool.setRate(m_geStreamId, rate);
		} // if
	}
	
	private boolean isGe(int a_padNumber) {
		return ((a_padNumber >= 0) && (a_padNumber <= 4));
	}
	
	private int toGeCent(int a_padNumber) {
		if (isGe(a_padNumber)) {
			return m_geCents[a_padNumber];
		} else {
			return SA_CENT;
		} // if-else
	}

	public void addTouch(int a_xScreen, int a_yScreen) {
		int padNumber = toPadNumber(a_xScreen, a_yScreen);
		if (isGe(padNumber)) {
			playGe(centToRate(toGeCent(padNumber)));
		}  // if
	}
}