@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
final float minAngle = (float) Math.PI / 8;
final float maxAngle = (float) Math.PI * 7 / 8;
float angle = minAngle;
if (mRecorder != null)
angle += (float) (maxAngle - minAngle) * mRecorder.getMaxAmplitude() / 32768;
if (angle > mCurrentAngle) mCurrentAngle = angle;
else mCurrentAngle = Math.max(angle, mCurrentAngle - DROPOFF_STEP);
mCurrentAngle = Math.min(maxAngle, mCurrentAngle);
float w = getWidth();
float h = getHeight();
float pivotX = w / 2;
float pivotY = h - PIVOT_RADIUS - PIVOT_Y_OFFSET;
float l = h * 4 / 5;
float sin = (float) Math.sin(mCurrentAngle);
float cos = (float) Math.cos(mCurrentAngle);
float x0 = pivotX - l * cos;
float y0 = pivotY - l * sin;
canvas.drawLine(
x0 + SHADOW_OFFSET,
y0 + SHADOW_OFFSET,
pivotX + SHADOW_OFFSET,
pivotY + SHADOW_OFFSET,
mShadow);
canvas.drawCircle(pivotX + SHADOW_OFFSET, pivotY + SHADOW_OFFSET, PIVOT_RADIUS, mShadow);
canvas.drawLine(x0, y0, pivotX, pivotY, mPaint);
canvas.drawCircle(pivotX, pivotY, PIVOT_RADIUS, mPaint);
if (mRecorder != null && mRecorder.state() == Recorder.RECORDING_STATE)
postInvalidateDelayed(ANIMATION_INTERVAL);
}
