package com.DeviceTest.helper;
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import java.util.Map;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.drawable.Drawable;
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import android.util.AttributeSet;
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import android.view.View;
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public class VUMeter extends View {
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static final float PIVOT_RADIUS = 3.5f;
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static final float PIVOT_Y_OFFSET = 10f;
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static final float SHADOW_OFFSET = 2.0f;
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static final float DROPOFF_STEP = 0.18f;
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static final float SURGE_STEP = 0.35f;
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static final long ANIMATION_INTERVAL = 70;
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Paint mPaint, mShadow;
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float mCurrentAngle;
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Recorder mRecorder;
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public VUMeter(Context context) {
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super(context);
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init(context);
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}
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public VUMeter(Context context, AttributeSet attrs) {
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super(context, attrs);
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init(context);
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}
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void init(Context context) {
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// Drawable background = getResources().getDrawable(R.drawable.vumeter);
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// setBackgroundDrawable(background);
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mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
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mPaint.setColor(Color.WHITE);
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mShadow = new Paint(Paint.ANTI_ALIAS_FLAG);
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mShadow.setColor(Color.argb(60, 0, 0, 0));
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mRecorder = null;
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mCurrentAngle = 0;
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}
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public void setRecorder(Recorder recorder) {
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mRecorder = recorder;
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invalidate();
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}
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@Override
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protected void onDraw(Canvas canvas) {
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super.onDraw(canvas);
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final float minAngle = (float)Math.PI/8;
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final float maxAngle = (float)Math.PI*7/8;
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float angle = minAngle;
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if (mRecorder != null)
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angle += (float)(maxAngle - minAngle)*mRecorder.getMaxAmplitude()/32768;
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if (angle > mCurrentAngle)
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mCurrentAngle = angle;
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else
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mCurrentAngle = Math.max(angle, mCurrentAngle - DROPOFF_STEP);
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mCurrentAngle = Math.min(maxAngle, mCurrentAngle);
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float w = getWidth();
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float h = getHeight();
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float pivotX = w/2;
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float pivotY = h - PIVOT_RADIUS - PIVOT_Y_OFFSET;
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float l = h*4/5;
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float sin = (float) Math.sin(mCurrentAngle);
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float cos = (float) Math.cos(mCurrentAngle);
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float x0 = pivotX - l*cos;
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float y0 = pivotY - l*sin;
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canvas.drawLine(x0 + SHADOW_OFFSET, y0 + SHADOW_OFFSET, pivotX + SHADOW_OFFSET, pivotY + SHADOW_OFFSET, mShadow);
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canvas.drawCircle(pivotX + SHADOW_OFFSET, pivotY + SHADOW_OFFSET, PIVOT_RADIUS, mShadow);
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canvas.drawLine(x0, y0, pivotX, pivotY, mPaint);
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canvas.drawCircle(pivotX, pivotY, PIVOT_RADIUS, mPaint);
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if (mRecorder != null && mRecorder.state() == Recorder.RECORDING_STATE)
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postInvalidateDelayed(ANIMATION_INTERVAL);
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}
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}
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