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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 CircleRenderer extends Renderer
{
private Paint mPaint;
private boolean mCycleColor;
/**
* Renders the audio data onto a pulsing circle
* @param canvas
* @param paint - Paint to draw lines with
*/
public CircleRenderer(Canvas canvas,
Paint paint)
{
this(canvas,
paint,
false);
}
/**
* Renders the audio data onto a pulsing circle
* @param canvas
* @param paint - Paint to draw lines with
* @param cycleColor - If true the color will change on each frame
*/
public CircleRenderer(Canvas canvas,
Paint paint,
boolean cycleColor)
{
super(canvas);
mPaint = paint;
mCycleColor = cycleColor;
}
@Override
public void onRender(AudioData data, Rect rect)
{
if(mCycleColor)
{
cycleColor();
}
for (int i = 0; i < data.bytes.length - 1; i++) {
float[] cartPoint = {
(float)i / (data.bytes.length - 1),
rect.height() / 2 + ((byte) (data.bytes[i] + 128)) * (rect.height() / 2) / 128
};
float[] polarPoint = toPolar(cartPoint, rect);
mPoints[i * 4] = polarPoint[0];
mPoints[i * 4 + 1] = polarPoint[1];
float[] cartPoint2 = {
(float)(i + 1) / (data.bytes.length - 1),
rect.height() / 2 + ((byte) (data.bytes[i + 1] + 128)) * (rect.height() / 2) / 128
};
float[] polarPoint2 = toPolar(cartPoint2, rect);
mPoints[i * 4 + 2] = polarPoint2[0];
mPoints[i * 4 + 3] = polarPoint2[1];
}
mCanvas.drawLines(mPoints, mPaint);
// Controls the pulsing rate
modulation += 0.04;
}
@Override
public void onRender(FFTData data, Rect rect)
{
// Do nothing, we only display audio data
}
float modulation = 0;
float aggresive = 0.33f;
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) * (1.2 + Math.sin(modulation))/2.2;
float[] out = {
(float)(cX + radius * Math.sin(angle)),
(float)(cY + radius * Math.cos(angle))
};
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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