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/**
* Copyright 2011, Felix Palmer
*
* Licensed under the MIT license:
* http://creativecommons.org/licenses/MIT/
*/
package com.pheelicks.visualizer.renderer;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import com.pheelicks.visualizer.AudioData;
import com.pheelicks.visualizer.FFTData;
public class LineRenderer extends Renderer
{
private Paint mPaint;
private Paint mFlashPaint;
private boolean mCycleColor;
private float amplitude = 0;
/**
* Renders the audio data onto a line. The line flashes on prominent beats
*
* @param canvas
* @param paint - Paint to draw lines with
* @param paint - Paint to draw flash with
*/
public LineRenderer(Paint paint, Paint flashPaint)
{
this(paint, flashPaint, false);
}
/**
* Renders the audio data onto a line. The line flashes on prominent beats
*
* @param canvas
* @param paint - Paint to draw lines with
* @param paint - Paint to draw flash with
* @param cycleColor - If true the color will change on each frame
*/
public LineRenderer(Paint paint,
Paint flashPaint,
boolean cycleColor)
{
super();
mPaint = paint;
mFlashPaint = flashPaint;
mCycleColor = cycleColor;
}
@Override
public void onRender(Canvas canvas, AudioData data, Rect rect)
{
if (mCycleColor)
{
cycleColor();
}
// Calculate points for line
for (int i = 0; i < data.bytes.length - 1; i++) {
mPoints[i * 4] = rect.width() * i / (data.bytes.length - 1);
mPoints[i * 4 + 1] = rect.height() / 2
+ ((byte) (data.bytes[i] + 128)) * (rect.height() / 3) / 128;
mPoints[i * 4 + 2] = rect.width() * (i + 1) / (data.bytes.length - 1);
mPoints[i * 4 + 3] = rect.height() / 2
+ ((byte) (data.bytes[i + 1] + 128)) * (rect.height() / 3) / 128;
}
// Calc amplitude for this waveform
float accumulator = 0;
for (int i = 0; i < data.bytes.length - 1; i++) {
accumulator += Math.abs(data.bytes[i]);
}
float amp = accumulator / (128 * data.bytes.length);
if (amp > amplitude)
{
// Amplitude is bigger than normal, make a prominent line
amplitude = amp;
canvas.drawLines(mPoints, mFlashPaint);
}
else
{
// Amplitude is nothing special, reduce the amplitude
amplitude *= 0.99;
canvas.drawLines(mPoints, mPaint);
}
}
@Override
public void onRender(Canvas canvas, FFTData data, Rect rect)
{
// Do nothing, we only display audio data
}
private float colorCounter = 0;
private void cycleColor()
{
int r = (int) Math.floor(128 * (Math.sin(colorCounter) + 3));
int g = (int) Math.floor(128 * (Math.sin(colorCounter + 1) + 1));
int b = (int) Math.floor(128 * (Math.sin(colorCounter + 7) + 1));
mPaint.setColor(Color.argb(128, r, g, b));
colorCounter += 0.03;
}
}
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