package com.easybbs.entity.dto;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
public class CreateImageCode {
    // 圖片的寬度。
    private int width = 160;
    // 圖片的高度。
    private int height = 40;
    // 驗(yàn)證碼字符個(gè)數(shù)
    private int codeCount = 4;
    // 驗(yàn)證碼干擾線數(shù)
    private int lineCount = 20;
    // 驗(yàn)證碼
    private String code = null;
    // 驗(yàn)證碼圖片Buffer
    private BufferedImage buffImg = null;
    Random random = new Random();
    public CreateImageCode() {
        creatImage();
    }
    public CreateImageCode(int width, int height) {
        this.width = width;
        this.height = height;
        creatImage();
    }
    public CreateImageCode(int width, int height, int codeCount) {
        this.width = width;
        this.height = height;
        this.codeCount = codeCount;
        creatImage();
    }
    public CreateImageCode(int width, int height, int codeCount, int lineCount) {
        this.width = width;
        this.height = height;
        this.codeCount = codeCount;
        this.lineCount = lineCount;
        creatImage();
    }
    // 生成圖片
    private void creatImage() {
        int fontWidth = width / codeCount;// 字體的寬度
        int fontHeight = height - 5;// 字體的高度
        int codeY = height - 8;
        // 圖像buffer
        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics g = buffImg.getGraphics();
        //Graphics2D g = buffImg.createGraphics();
        // 設(shè)置背景色
        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);
        // 設(shè)置字體
        //Font font1 = getFont(fontHeight);
        Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
        g.setFont(font);
        // 設(shè)置干擾線
        for (int i = 0; i < lineCount; i++) {
            int xs = random.nextInt(width);
            int ys = random.nextInt(height);
            int xe = xs + random.nextInt(width);
            int ye = ys + random.nextInt(height);
            g.setColor(getRandColor(1, 255));
            g.drawLine(xs, ys, xe, ye);
        }
        // 添加噪點(diǎn)
        float yawpRate = 0.01f;// 噪聲率
        int area = (int) (yawpRate * width * height);
        for (int i = 0; i < area; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            buffImg.setRGB(x, y, random.nextInt(255));
        }
        String str1 = randomStr(codeCount);// 得到隨機(jī)字符
        this.code = str1;
        for (int i = 0; i < codeCount; i++) {
            String strRand = str1.substring(i, i + 1);
            g.setColor(getRandColor(1, 255));
            // g.drawString(a,x,y);
            // a為要畫出來的東西，x和y表示要畫的東西最左側(cè)字符的基線位于此圖形上下文坐標(biāo)系的 (x, y) 位置處
            g.drawString(strRand, i * fontWidth + 3, codeY);
        }
    }
    // 得到隨機(jī)字符
    private String randomStr(int n) {
        String str1 = "ABCDEFGHJKMNOPQRSTUVWXYZabcdefghjkmnopqrstuvwxyz234567890";
        String str2 = "";
        int len = str1.length() - 1;
        double r;
        for (int i = 0; i < n; i++) {
            r = (Math.random()) * len;
            str2 = str2 + str1.charAt((int) r);
        }
        return str2;
    }
    // 得到隨機(jī)顏色
    private Color getRandColor(int fc, int bc) {// 給定范圍獲得隨機(jī)顏色
        if (fc > 255) fc = 255;
        if (bc > 255) bc = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }
    /**
     * 產(chǎn)生隨機(jī)字體
     */
    private Font getFont(int size) {
        Random random = new Random();
        Font font[] = new Font[5];
        font[0] = new Font("Ravie", Font.PLAIN, size);
        font[1] = new Font("Antique Olive Compact", Font.PLAIN, size);
        font[2] = new Font("Fixedsys", Font.PLAIN, size);
        font[3] = new Font("Wide Latin", Font.PLAIN, size);
        font[4] = new Font("Gill Sans Ultra Bold", Font.PLAIN, size);
        return font[random.nextInt(5)];
    }
    // 扭曲方法
    private void shear(Graphics g, int w1, int h1, Color color) {
        shearX(g, w1, h1, color);
        shearY(g, w1, h1, color);
    }
    private void shearX(Graphics g, int w1, int h1, Color color) {
        int period = random.nextInt(2);
        boolean borderGap = true;
        int frames = 1;
        int phase = random.nextInt(2);
        for (int i = 0; i < h1; i++) {
            double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
            g.copyArea(0, i, w1, 1, (int) d, 0);
            if (borderGap) {
                g.setColor(color);
                g.drawLine((int) d, i, 0, i);
                g.drawLine((int) d + w1, i, w1, i);
            }
        }
    }
    private void shearY(Graphics g, int w1, int h1, Color color) {
        int period = random.nextInt(40) + 10; // 50;
        boolean borderGap = true;
        int frames = 20;
        int phase = 7;
        for (int i = 0; i < w1; i++) {
            double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
            g.copyArea(i, 0, 1, h1, 0, (int) d);
            if (borderGap) {
                g.setColor(color);
                g.drawLine(i, (int) d, i, 0);
                g.drawLine(i, (int) d + h1, i, h1);
            }
        }
    }
    public void write(OutputStream sos) throws IOException {
        ImageIO.write(buffImg, "png", sos);
        sos.close();
    }
    public BufferedImage getBuffImg() {
        return buffImg;
    }
    public String getCode() {
        return code.toLowerCase();
    }
}

@RequestMapping("/checkCode")
    public void checkCode(HttpServletResponse response, HttpSession session) throws IOException {
        // 創(chuàng)建一個(gè)驗(yàn)證碼對(duì)象，參數(shù)分別指定驗(yàn)證碼的寬度、高度、字符數(shù)量和干擾線數(shù)量。
        CreateImageCode vCode = new CreateImageCode(130, 38, 5, 10);
        // 設(shè)置響應(yīng)頭，確保瀏覽器不緩存驗(yàn)證碼圖像。
        response.setHeader("Pragma","no-cache");
        response.setHeader("Cache-Control","no-cache");
        response.setDateHeader("Expires", 0);
        // 設(shè)置響應(yīng)類型為JPEG圖像。
        response.setContentType("image/jpeg");
        // 生成驗(yàn)證碼字符串。
        String code = vCode.getCode();
        // 根據(jù)類型將驗(yàn)證碼存儲(chǔ)在不同的session屬性中。
        session.setAttribute("checkCodeKey",code);
        // 將生成的驗(yàn)證碼圖像寫入響應(yīng)輸出流。
        vCode.write(response.getOutputStream());
    }