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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.Rect;
import com.pheelicks.visualizer.AudioData;
import com.pheelicks.visualizer.FFTData;
abstract public class Renderer
{
// Have these as members, so we don't have to re-create them each time
protected float[] mPoints;
protected float[] mFFTPoints;
public Renderer()
{
}
// As the display of raw/FFT audio will usually look different, subclasses
// will typically only implement one of the below methods
/**
* Implement this method to render the audio data onto the canvas
* @param canvas - Canvas to draw on
* @param data - Data to render
* @param rect - Rect to render into
*/
abstract public void onRender(Canvas canvas, AudioData data, Rect rect);
/**
* Implement this method to render the FFT audio data onto the canvas
* @param canvas - Canvas to draw on
* @param data - Data to render
* @param rect - Rect to render into
*/
abstract public void onRender(Canvas canvas, FFTData data, Rect rect);
// These methods should actually be called for rendering
/**
* Render the audio data onto the canvas
* @param canvas - Canvas to draw on
* @param data - Data to render
* @param rect - Rect to render into
*/
final public void render(Canvas canvas, AudioData data, Rect rect)
{
if (mPoints == null || mPoints.length < data.bytes.length * 4) {
mPoints = new float[data.bytes.length * 4];
}
onRender(canvas, data, rect);
}
/**
* Render the FFT data onto the canvas
* @param canvas - Canvas to draw on
* @param data - Data to render
* @param rect - Rect to render into
*/
final public void render(Canvas canvas, FFTData data, Rect rect)
{
if (mFFTPoints == null || mFFTPoints.length < data.bytes.length * 4) {
mFFTPoints = new float[data.bytes.length * 4];
}
onRender(canvas, data, rect);
}
}
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