1 files changed, 108 insertions, 0 deletions
diff --git a/src/com/pheelicks/visualizer/renderer/CircleRenderer.java b/src/com/pheelicks/visualizer/renderer/CircleRenderer.java
new file mode 100644
index 0000000..4f25c46
--- /dev/null
+++ b/src/com/pheelicks/visualizer/renderer/CircleRenderer.java
@@ -0,0 +1,108 @@
+package com.pheelicks.visualizer.renderer;
+
+import com.pheelicks.visualizer.AudioData;
+import com.pheelicks.visualizer.FFTData;
+
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Rect;
+
+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;
+  }
+}