Eleven: Add equalizer visualization

Change-Id: I9a3112cf4138e916ed53571236e54b67c30b53c4

1 files changed, 165 insertions, 0 deletions

diff --git a/src/com/cyngn/eleven/widgets/EqualizerView.java b/src/com/cyngn/eleven/widgets/EqualizerView.java
new file mode 100644
index 0000000..5814692
--- /dev/null
+++ b/src/com/cyngn/eleven/widgets/EqualizerView.java
@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 2014 Cyanogen, Inc.
+ */
+package com.cyngn.eleven.widgets;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Canvas;
+import android.graphics.DashPathEffect;
+import android.graphics.Paint;
+import android.graphics.Rect;
+import android.util.AttributeSet;
+import android.util.Log;
+
+import com.cyngn.eleven.R;
+import com.cyngn.eleven.utils.MusicUtils;
+import com.cyngn.eleven.utils.PreferenceUtils;
+import com.pheelicks.visualizer.AudioData;
+import com.pheelicks.visualizer.FFTData;
+import com.pheelicks.visualizer.VisualizerView;
+import com.pheelicks.visualizer.renderer.Renderer;
+
+public class EqualizerView extends VisualizerView {
+    private boolean mLinked = false;
+    private boolean mStarted = false;
+    private boolean mPanelVisible = false;
+
+    private final Runnable mLinkVisualizer = new Runnable() {
+        @Override
+        public void run() {
+            if (!mLinked) {
+                animate().alpha(1).setDuration(300);
+                link(0);
+                mLinked = true;
+            }
+        }
+    };
+
+    private final Runnable mUnlinkVisualizer = new Runnable() {
+        @Override
+        public void run() {
+            if (mLinked) {
+                animate().alpha(0).setDuration(300);
+                unlink();
+                mLinked = false;
+            }
+        }
+    };
+
+    private static class TileBarGraphRenderer extends Renderer {
+        private int mDivisions;
+        private Paint mPaint;
+        private int mDbFuzz;
+        private int mDbFuzzFactor;
+
+        /**
+         * Renders the FFT data as a series of lines, in histogram form
+         *
+         * @param divisions - must be a power of 2. Controls how many lines to draw
+         * @param paint     - Paint to draw lines with
+         * @param dbfuzz    - final dB display adjustment
+         * @param dbFactor  - dbfuzz is multiplied by dbFactor.
+         */
+        public TileBarGraphRenderer(int divisions, Paint paint, int dbfuzz, int dbFactor) {
+            super();
+            mDivisions = divisions;
+            mPaint = paint;
+            mDbFuzz = dbfuzz;
+            mDbFuzzFactor = dbFactor;
+        }
+
+        @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) {
+            for (int i = 0; i < data.bytes.length / mDivisions; i++) {
+                mFFTPoints[i * 4] = i * 4 * mDivisions;
+                mFFTPoints[i * 4 + 2] = i * 4 * mDivisions;
+                byte rfk = data.bytes[mDivisions * i];
+                byte ifk = data.bytes[mDivisions * i + 1];
+                float magnitude = (rfk * rfk + ifk * ifk);
+                int dbValue = (int) (10 * Math.log10(magnitude));
+
+                mFFTPoints[i * 4 + 1] = rect.height();
+                mFFTPoints[i * 4 + 3] = rect.height() - (dbValue * mDbFuzzFactor + mDbFuzz);
+            }
+
+            canvas.drawLines(mFFTPoints, mPaint);
+        }
+    }
+
+    public EqualizerView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    public EqualizerView(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public EqualizerView(Context context) {
+        this(context, null, 0);
+    }
+
+    public void initialize(Context context) {
+        setEnabled(false);
+
+        Resources res = mContext.getResources();
+        Paint paint = new Paint();
+        paint.setStrokeWidth(res.getDimensionPixelSize(R.dimen.eqalizer_path_stroke_width));
+        paint.setAntiAlias(true);
+        paint.setColor(res.getColor(R.color.equalizer_fill_color));
+        paint.setPathEffect(new DashPathEffect(new float[]{
+                res.getDimensionPixelSize(R.dimen.eqalizer_path_effect_1),
+                res.getDimensionPixelSize(R.dimen.eqalizer_path_effect_2)
+        }, 0));
+
+        int bars = res.getInteger(R.integer.equalizer_divisions);
+        addRenderer(new TileBarGraphRenderer(bars, paint,
+                res.getInteger(R.integer.equalizer_db_fuzz),
+                res.getInteger(R.integer.equalizer_db_fuzz_factor)));
+    }
+
+    /**
+     * Follows Fragment onStart to determine if the containing fragment/activity is started
+     */
+    public void onStart() {
+        mStarted = true;
+        checkStateChanged();
+    }
+
+    /**
+     * Follows Fragment onStop to determine if the containing fragment/activity is stopped
+     */
+    public void onStop() {
+        mStarted = false;
+        checkStateChanged();
+    }
+
+    /**
+     * Separate method to toggle panel visibility - currently used when the user slides to
+     * improve performance of the sliding panel
+     */
+    public void setPanelVisible(boolean panelVisible) {
+        if (mPanelVisible != panelVisible) {
+            mPanelVisible = panelVisible;
+            checkStateChanged();
+        }
+    }
+
+    /**
+     * Checks the state of the EqualizerView to determine whether we want to link up the equalizer
+     */
+    public void checkStateChanged() {
+        if (mPanelVisible && mStarted
+                && PreferenceUtils.getInstance(mContext).getShowVisualizer()
+                && MusicUtils.getQueueSize() > 0) {
+            mLinkVisualizer.run();
+        } else {
+            mUnlinkVisualizer.run();
+        }
+    }
+}