package com.nobeg.util;

 import java.util.Random;

 import android.graphics.Bitmap;

 import android.graphics.Canvas;

 import android.graphics.Color;

 import android.graphics.Paint;

 import android.graphics.Bitmap.Config;

 public class Code {

     private static final char[] CHARS = {

         '2', '3', '4', '5', '6', '7', '8', '9',

         'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'l', 'm',

         'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',

         'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',

         'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'

     };

     private static Code bmpCode;

     public static Code getInstance() {

         if(bmpCode == null)

             bmpCode = new Code();

         return bmpCode;

     }

     //default settings

     private static final int DEFAULT_CODE_LENGTH = 3;

     private static final int DEFAULT_FONT_SIZE = 40;

     private static final int DEFAULT_LINE_NUMBER = 2;

     private static final int BASE_PADDING_LEFT = 20, RANGE_PADDING_LEFT = 15, BASE_PADDING_TOP = 30, RANGE_PADDING_TOP = 20;

     private static final int DEFAULT_WIDTH = 130, DEFAULT_HEIGHT = 80;

     //settings decided by the layout xml

     //canvas width and height

     private int width = DEFAULT_WIDTH, height = DEFAULT_HEIGHT; 

     //random word space and pading_top

     private int base_padding_left = BASE_PADDING_LEFT, range_padding_left = RANGE_PADDING_LEFT,

             base_padding_top = BASE_PADDING_TOP, range_padding_top = RANGE_PADDING_TOP;

     //number of chars, lines; font size

     private int codeLength = DEFAULT_CODE_LENGTH, line_number = DEFAULT_LINE_NUMBER, font_size = DEFAULT_FONT_SIZE;

     //variables

     private String code;

     private int padding_left, padding_top;

     private Random random = new Random();

     //验证码图片

     public Bitmap createBitmap() {

         padding_left = 0;

         Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888);

         Canvas c = new Canvas(bp);

         code = createCode();

         c.drawColor(Color.WHITE);

         Paint paint = new Paint();

         paint.setTextSize(font_size);

         for (int i = 0; i < code.length(); i++) {

             randomTextStyle(paint);

             randomPadding();

             c.drawText(code.charAt(i) + "", padding_left, padding_top, paint);

         }

         for (int i = 0; i < line_number; i++) {

             drawLine(c, paint);

         }

         c.save( Canvas.ALL_SAVE_FLAG );//保存

         c.restore();//

         return bp;

     }

     public String getCode() {

         return code;

     }

     //验证码

     private String createCode() {

         StringBuilder buffer = new StringBuilder();

         for (int i = 0; i < codeLength; i++) {

             buffer.append(CHARS[random.nextInt(CHARS.length)]);

         }

         return buffer.toString();

     }

     private void drawLine(Canvas canvas, Paint paint) {

         int color = randomColor();

         int startX = random.nextInt(width);

         int startY = random.nextInt(height);

         int stopX = random.nextInt(width);

         int stopY = random.nextInt(height);

         paint.setStrokeWidth(1);

         paint.setColor(color);

         canvas.drawLine(startX, startY, stopX, stopY, paint);

     }

     private int randomColor() {

         return randomColor(1);

     }

     private int randomColor(int rate) {

         int red = random.nextInt(256) / rate;

         int green = random.nextInt(256) / rate;

         int blue = random.nextInt(256) / rate;

         return Color.rgb(red, green, blue);

     }

     private void randomTextStyle(Paint paint) {

         int color = randomColor();

         paint.setColor(color);

         paint.setFakeBoldText(random.nextBoolean());  //true为粗体，false为非粗体

         float skewX = random.nextInt(11) / 10;

         skewX = random.nextBoolean() ? skewX : -skewX;

         paint.setTextSkewX(skewX); //float类型参数，负数表示右斜，整数左斜

 //        paint.setUnderlineText(true); //true为下划线，false为非下划线

 //        paint.setStrikeThruText(true); //true为删除线，false为非删除线

     }

     private void randomPadding() {

         padding_left += base_padding_left + random.nextInt(range_padding_left);

         padding_top = base_padding_top + random.nextInt(range_padding_top);

     }

 }

    /**

     * 生成验证码

     */

    private void createConfirmCode(){

        mImageView.setImageBitmap(ConfirmCode.getInstance()

                .createBitmap());

        String Code = ConfirmCode.getInstance().getCode();

    }