diff options
Diffstat (limited to 'src/com/pheelicks/visualizer/renderer/CircleBarRenderer.java')
-rw-r--r-- | src/com/pheelicks/visualizer/renderer/CircleBarRenderer.java | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/src/com/pheelicks/visualizer/renderer/CircleBarRenderer.java b/src/com/pheelicks/visualizer/renderer/CircleBarRenderer.java new file mode 100644 index 0000000..ff1e7d5 --- /dev/null +++ b/src/com/pheelicks/visualizer/renderer/CircleBarRenderer.java @@ -0,0 +1,121 @@ +/** + * 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 CircleBarRenderer extends Renderer +{ + private int mDivisions; + private Paint mPaint; + private boolean mCycleColor; + + /** + * Renders the FFT data onto a pulsing, rotating circle + * @param canvas + * @param paint - Paint to draw lines with + */ + public CircleBarRenderer(Paint paint, int divisions) + { + this(paint, divisions, false); + } + + /** + * Renders the audio data onto a pulsing circle + * @param canvas + * @param paint - Paint to draw lines with + * @param divisions - must be a power of 2. Controls how many lines to draw + * @param cycleColor - If true the color will change on each frame + */ + public CircleBarRenderer(Paint paint, int divisions, boolean cycleColor) + { + super(); + mPaint = paint; + mDivisions = divisions; + mCycleColor = cycleColor; + } + + @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) + { + if(mCycleColor) + { + cycleColor(); + } + + for (int i = 0; i < data.bytes.length / mDivisions; i++) { + // Calculate dbValue + byte rfk = data.bytes[mDivisions * i]; + byte ifk = data.bytes[mDivisions * i + 1]; + float magnitude = (rfk * rfk + ifk * ifk); + float dbValue = 75 * (float)Math.log10(magnitude); + + float[] cartPoint = { + (float)(i * mDivisions) / (data.bytes.length - 1), + rect.height() / 2 - dbValue / 4 + }; + + float[] polarPoint = toPolar(cartPoint, rect); + mFFTPoints[i * 4] = polarPoint[0]; + mFFTPoints[i * 4 + 1] = polarPoint[1]; + + float[] cartPoint2 = { + (float)(i * mDivisions) / (data.bytes.length - 1), + rect.height() / 2 + dbValue + }; + + float[] polarPoint2 = toPolar(cartPoint2, rect); + mFFTPoints[i * 4 + 2] = polarPoint2[0]; + mFFTPoints[i * 4 + 3] = polarPoint2[1]; + } + + canvas.drawLines(mFFTPoints, mPaint); + + // Controls the pulsing rate + modulation += 0.13; + angleModulation += 0.28; + } + + float modulation = 0; + float modulationStrength = 0.4f; // 0-1 + float angleModulation = 0; + float aggresive = 0.4f; + 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 - modulationStrength) + modulationStrength * (1 + Math.sin(modulation)) / 2); + float[] out = { + (float)(cX + radius * Math.sin(angle + angleModulation)), + (float)(cY + radius * Math.cos(angle + angleModulation)) + }; + 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; + } +} |