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Create Calculator.java
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@Kefta
Kefta authored Dec 1, 2016
1 parent d65265b commit 24a23dc
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260 changes: 260 additions & 0 deletions Calculator.java
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package code_gs.binarycalculatortuner;

import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.graphics.Canvas;
import android.graphics.Bitmap;
import android.graphics.Point;

public class Calculator extends AppCompatActivity
{
private static final int CHANNELS = AudioFormat.CHANNEL_IN_MONO;
private static final int ENCODING = AudioFormat.ENCODING_PCM_16BIT;
private static final int SAMPLE_RATE = 44100;
private static final int BIT_SIZE = 3;
private static final int FONT_SIZE = 125;
private static final int COLUMN_NUMBER = 7;

private Canvas m_Canvas;
private Paint m_Paint;

// Two numbers with BIT_SIZE digits and one sign
private boolean[] m_tBits = new boolean[BIT_SIZE * 2 + 1];
// Position of the selector box
private int m_iPos = 0;
// Last polled frequency
private double m_dFrequency = 0;

@Override
protected void onCreate(Bundle instance)
{
super.onCreate(instance);
setContentView(R.layout.activity_calculator);

Point p = new Point();
getWindowManager().getDefaultDisplay().getSize(p);

// Full-screen
Bitmap bitmap = Bitmap.createBitmap(
p.x,
p.y,
Bitmap.Config.ALPHA_8 // Minimum colour selection
);

// Place the bitmap over the screen
((ImageView) findViewById(R.id.iv)).setImageBitmap(bitmap);

m_Canvas = new Canvas(bitmap);
m_Paint = new Paint();
m_Paint.setStyle(Paint.Style.FILL);
m_Paint.setColor(Color.WHITE);
m_Paint.setAntiAlias(true); // Looks bad on Nexus without it. May just be the emulator
m_Paint.setTextSize(FONT_SIZE);
m_Paint.setTextAlign(Paint.Align.CENTER);

final EditText min = (EditText) findViewById(R.id.pitch_one);
final EditText max = (EditText) findViewById(R.id.pitch_two);

// Polls the mic for the frequency and redraws
((Button) findViewById(R.id.btn_poll)).setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
// Will throw exceptions upon permission failure or too many apps using the mic
try
{
int size = AudioRecord.getMinBufferSize(SAMPLE_RATE, CHANNELS, ENCODING);
short[] buffer = new short[size];

AudioRecord audioInput = new AudioRecord(MediaRecorder.AudioSource.MIC, SAMPLE_RATE, CHANNELS, ENCODING, size);
audioInput.startRecording();
int count = audioInput.read(buffer, 0, size);
audioInput.stop();
audioInput.release();
m_dFrequency = Tuner.getFrequency(SAMPLE_RATE, size, count, buffer);

// Change the currently selected bit if a valid frequency was returned
if (m_dFrequency != -1)
m_tBits[m_iPos] = !(Math.abs(m_dFrequency - Double.parseDouble(min.getText().toString())) < Math.abs(m_dFrequency - Double.parseDouble(max.getText().toString())));
}
catch (Exception e)
{
//Log.d("Calculator", e.toString());
m_dFrequency = -1;
}

draw();
}
});

((Button) findViewById(R.id.btn_right)).setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
m_iPos = (m_iPos + 1) % m_tBits.length;
draw();
}
});

((Button) findViewById(R.id.btn_left)).setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
// Wrap back around; Java's mod doesn't handle negatives properly >:(
if (m_iPos == 0)
m_iPos = m_tBits.length - 1;
else
m_iPos--;

draw();
}
});

draw();
}

/*private static String addBinary(String n1, String n2)
{
StringBuilder sb = new StringBuilder();
int carry = 0;
for (int i = BIT_SIZE - 1; i > -1; i--) {
int sum = carry + n1.charAt(i) - '0' + n2.charAt(i) - '0';
carry = sum >> 1;
sb.append((sum & 1) == 0 ? '0' : '1');
}
if (carry > 0)
sb.append('1');
sb.reverse();
return String.valueOf(sb);
}*/

void draw()
{
// Reset the canvas
m_Canvas.drawColor(0, PorterDuff.Mode.CLEAR);

m_Canvas.drawText(
String.valueOf(m_dFrequency),
m_Canvas.getWidth() * (1.f/2),
m_Canvas.getHeight() * (1.f/COLUMN_NUMBER),
m_Paint
);

int n1 = 0;

for (int i = 0; i < BIT_SIZE; i++)
{
if (i == m_iPos)
{
m_Paint.setFakeBoldText(true);
m_Paint.setColor(Color.RED);
m_Paint.setTextSize(FONT_SIZE * (7.f/6));
}

if (m_tBits[i])
n1 += Math.pow(2, BIT_SIZE - 1 - i);

m_Canvas.drawText(
m_tBits[i] ? "1" : "0",
m_Canvas.getWidth() * ((i + 1.f)/(BIT_SIZE + 1)),
m_Canvas.getHeight() * (2.f/COLUMN_NUMBER),
m_Paint
);

if (i == m_iPos)
{
m_Paint.setFakeBoldText(false);
m_Paint.setColor(Color.WHITE);
m_Paint.setTextSize(FONT_SIZE);
}
}

if (m_iPos == BIT_SIZE)
{
m_Paint.setFakeBoldText(true);
m_Paint.setColor(Color.RED);
m_Paint.setTextSize(FONT_SIZE * (7.f/6));
}

m_Canvas.drawText(
m_tBits[BIT_SIZE] ? "-" : "+",
m_Canvas.getWidth() * (1.f/2),
m_Canvas.getHeight() * (3.f/COLUMN_NUMBER),
m_Paint
);

if (m_iPos == BIT_SIZE)
{
m_Paint.setFakeBoldText(false);
m_Paint.setColor(Color.WHITE);
m_Paint.setTextSize(FONT_SIZE);
}

int n2 = 0;

for (int i = BIT_SIZE + 1; i < m_tBits.length; i++)
{
if (i == m_iPos)
{
m_Paint.setFakeBoldText(true);
m_Paint.setColor(Color.RED);
m_Paint.setTextSize(FONT_SIZE * (7.f/6));
}

if (m_tBits[i])
n2 += Math.pow(2, BIT_SIZE - (i - BIT_SIZE));

m_Canvas.drawText(
m_tBits[i] ? "1" : "0",
m_Canvas.getWidth() * ((float)(i - BIT_SIZE)/(BIT_SIZE + 1)), // x
m_Canvas.getHeight() * (4.f/COLUMN_NUMBER),
m_Paint
);

if (i == m_iPos)
{
m_Paint.setFakeBoldText(false);
m_Paint.setColor(Color.WHITE);
m_Paint.setTextSize(FONT_SIZE);
}
}

m_Canvas.drawText(
"=",
m_Canvas.getWidth() * (1.f/2),
m_Canvas.getHeight() * (5.f/COLUMN_NUMBER),
m_Paint
);

int output = n1 + (m_tBits[BIT_SIZE] ? -n2 : n2);

if (output < 0)
output += Math.pow(2, BIT_SIZE + 1);
//else
// output %= BIT_SIZE + 1;

m_Canvas.drawText(
Integer.toBinaryString(output),
m_Canvas.getWidth() * (1.f/2),
m_Canvas.getHeight() * (6.f/COLUMN_NUMBER),
m_Paint
);
}
}

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