package com.hwc.oklib.util;

import android.content.Context;
import android.util.TypedValue;

/** 
 * @ClassName: DensityUtils 
 * @Description: 常用单位转换的辅助类
 * @author 黄伟才
 * @date 2015-10-19 下午6:14:26 
 */
public class DpUtils {
    private DpUtils() {
        /* 不能被实例 */
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    /**
     * dp转px
     * 
     * @param context
     * @return
     */
    public static int dp2px(Context context, float dpVal) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                dpVal, context.getResources().getDisplayMetrics());
    }

    /**
     * sp转px
     * 
     * @param context
     * @return
     */
    public static int sp2px(Context context, float spVal) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
                spVal, context.getResources().getDisplayMetrics());
    }

    /**
     * px转dp
     * 
     * @param context
     * @param pxVal
     * @return
     */
    public static float px2dp(Context context, float pxVal) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (pxVal / scale);
    }

    /**
     * px转sp
     * 
     * @param pxVal
     * @return
     */
    public static float px2sp(Context context, float pxVal) {
        return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);
    }
}