AbCompassView.java

/*
 * Copyright (C) 2012 www.amsoft.cn
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.ab.view.app;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;
// TODO: Auto-generated Javadoc
import android.widget.ImageView;

/**
 * © 2012 amsoft.cn
 * 名称：AbCompassView.java 
 * 描述：指南针
 *
 * @author 还如一梦中
 * @version v1.0
 * @date：2013-8-23 下午2:03:29
 */
public class AbCompassView extends ImageView {
    
	/** 上下文. */
	private Context mContext = null;
	
    /** 指南针图标. */
    private Drawable mCompassDrawable = null;
    
    /** 方向. */
    private float mDirection = 0.0f;
    
	
    /**
     * Instantiates a new ab compass view.
     *
     * @param context the context
     */
    public AbCompassView(Context context) {
        this(context,null);
        
    }

	/**
	 * Instantiates a new ab compass view.
	 *
	 * @param context the context
	 * @param attrs the attrs
	 */
	public AbCompassView(Context context, AttributeSet attrs) {
		super(context, attrs);
		this.mContext = context;
	}

	/* (non-Javadoc)
	 * @see android.view.View#onDraw(android.graphics.Canvas)
	 */
	@Override 
    protected void onDraw(Canvas canvas) {
		canvas.drawColor(Color.TRANSPARENT);
		int h = getHeight();
		int w = getWidth();
		canvas.rotate(-(90 + this.mDirection), w / 2, h / 2);
		super.onDraw(canvas);
    }

	/**
	 * Gets the direction.
	 *
	 * @return the direction
	 */
	public float getDirection() {
		return mDirection;
	}

	/**
	 * Sets the direction.
	 *
	 * @param direction the new direction
	 */
	public void setDirection(float direction) {
		this.mDirection = direction;
		this.invalidate();
	}

	/**
	 * 描述：设置指南针图片.
	 *
	 * @param drawable 必须设置才能显示
	 */
	public void setCompassDrawable(Drawable drawable) {
		this.mCompassDrawable = drawable;
		this.mCompassDrawable.setBounds(0, 0, this.mCompassDrawable .getIntrinsicWidth(), this.mCompassDrawable.getIntrinsicHeight());
		this.setImageDrawable(this.mCompassDrawable);
		this.invalidate();
	}
	
	/**
	 * 描述：设置指南针图片.
	 *
	 * @param id 
	 */
	public void setCompassDrawable(int id) {
		this.mCompassDrawable = mContext.getResources().getDrawable(id);
		this.mCompassDrawable.setBounds(0, 0, this.mCompassDrawable .getIntrinsicWidth(), this.mCompassDrawable.getIntrinsicHeight());
		this.setImageDrawable(this.mCompassDrawable);
		this.invalidate();
	}
	
    
}