1 files changed, 78 insertions, 0 deletions
diff --git a/src/com/pheelicks/visualizer/renderer/Renderer.java b/src/com/pheelicks/visualizer/renderer/Renderer.java
new file mode 100644
index 0000000..2d18d55
--- /dev/null
+++ b/src/com/pheelicks/visualizer/renderer/Renderer.java
@@ -0,0 +1,78 @@
+/**
+ * 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);
+    }
+}