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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 CircleBarRenderer extends Renderer
{
private int mDivisions;
private Paint mPaint;
private boolean mCycleColor;
/**
* Renders the FFT data onto a pulsing, rotating circle
* @param canvas
* @param paint - Paint to draw lines with
*/
public CircleBarRenderer(Paint paint, int divisions)
{
this(paint, divisions, false);
}
/**
* Renders the audio data onto a pulsing circle
* @param canvas
* @param paint - Paint to draw lines with
* @param divisions - must be a power of 2. Controls how many lines to draw
* @param cycleColor - If true the color will change on each frame
*/
public CircleBarRenderer(Paint paint, int divisions, boolean cycleColor)
{
super();
mPaint = paint;
mDivisions = divisions;
mCycleColor = cycleColor;
}
@Override
public void onRender(Canvas canvas, AudioData data, Rect rect)
{
// Do nothing, we only display FFT data
}
@Override
public void onRender(Canvas canvas, FFTData data, Rect rect)
{
if(mCycleColor)
{
cycleColor();
}
for (int i = 0; i < data.bytes.length / mDivisions; i++) {
// Calculate dbValue
byte rfk = data.bytes[mDivisions * i];
byte ifk = data.bytes[mDivisions * i + 1];
float magnitude = (rfk * rfk + ifk * ifk);
float dbValue = 75 * (float)Math.log10(magnitude);
float[] cartPoint = {
(float)(i * mDivisions) / (data.bytes.length - 1),
rect.height() / 2 - dbValue / 4
};
float[] polarPoint = toPolar(cartPoint, rect);
mFFTPoints[i * 4] = polarPoint[0];
mFFTPoints[i * 4 + 1] = polarPoint[1];
float[] cartPoint2 = {
(float)(i * mDivisions) / (data.bytes.length - 1),
rect.height() / 2 + dbValue
};
float[] polarPoint2 = toPolar(cartPoint2, rect);
mFFTPoints[i * 4 + 2] = polarPoint2[0];
mFFTPoints[i * 4 + 3] = polarPoint2[1];
}
canvas.drawLines(mFFTPoints, mPaint);
// Controls the pulsing rate
modulation += 0.13;
angleModulation += 0.28;
}
float modulation = 0;
float modulationStrength = 0.4f; // 0-1
float angleModulation = 0;
float aggresive = 0.4f;
private float[] toPolar(float[] cartesian, Rect rect)
{
double cX = rect.width()/2;
double cY = rect.height()/2;
double angle = (cartesian[0]) * 2 * Math.PI;
double radius = ((rect.width()/2) * (1 - aggresive) + aggresive * cartesian[1]/2) * ((1 - modulationStrength) + modulationStrength * (1 + Math.sin(modulation)) / 2);
float[] out = {
(float)(cX + radius * Math.sin(angle + angleModulation)),
(float)(cY + radius * Math.cos(angle + angleModulation))
};
return out;
}
private float colorCounter = 0;
private void cycleColor()
{
int r = (int)Math.floor(128*(Math.sin(colorCounter) + 1));
int g = (int)Math.floor(128*(Math.sin(colorCounter + 2) + 1));
int b = (int)Math.floor(128*(Math.sin(colorCounter + 4) + 1));
mPaint.setColor(Color.argb(128, r, g, b));
colorCounter += 0.03;
}
}
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