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首頁(yè)精彩閱讀Hilbert空間遞歸演示?_數(shù)據(jù)分析師
Hilbert空間遞歸演示?_數(shù)據(jù)分析師
2014-12-07
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Hilbert空間遞歸演示_數(shù)據(jù)分析師


Hilbert空間填充曲線在圖像采樣等方面十分有用關(guān)于什么希爾伯特

空間填充曲線看這里：http://en.wikipedia.org/wiki/Hilbert_curve

程序效果:

模擬Hilbert空間填充曲線效果，點(diǎn)擊鼠標(biāo)自動(dòng)疊加！運(yùn)行效果截圖

20140217231252375

Hilbert源程序代碼：

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package com.gloomyfish.image.hilbert;
         
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
         
public class Hilbert {
             
    public static final int WHEELSIZE = 1024;
             
    // four edges
    public static final int NORTH = 0;
    public static final int EAST = 90;
    public static final int SOUTH = 180;
    public static final int WEST = 270;
         
    // four corners
    public static final int NE = 45;
    public static final int SE = 135;
    public static final int SW = 225;
    public static final int NW = 315;
             
    // attributes
    private Point location;
    private Color[] colorWheel;
    private int colorIdx;
         
    public Hilbert() {
        // build color lookup table
        this.colorWheel = new Color[1024];
        for (int i = 0; i < 128; ++i)
            this.colorWheel[i] = new Color(0, 255 - i, i);
        for (int j = 128; j < 256; ++j)
            this.colorWheel[j] = new Color(0, j, j);
        for (int k = 0; k < 256; ++k)
            this.colorWheel[(k + 256)] = new Color(0, 255 - k, 255);
        for (int l = 0; l < 128; ++l)
            this.colorWheel[(l + 512)] = new Color(0, l, 255 - l);
        for (int i1 = 0; i1 < 128; ++i1)
            this.colorWheel[(i1 + 640)] = new Color(0, 127 - i1, 127 - i1);
        for (int i2 = 0; i2 < 256; ++i2)
            this.colorWheel[(i2 + 768)] = new Color(0, i2, 0);
        this.colorIdx = 0;
    }
         
    public void process(Graphics graphic, int level, int width, int height) {
        this.location = null;
        if(level > 32 ) 
        {
            graphic.drawString("could get max depth is 32!", 40, 40);
            return;
        }
        hilbert(graphic, level, 0, 0, width, height, 0, 225);
    }
         
    public void hilbert(Graphics g, int depth, int startx, int starty, int width, int height, int startgray, int endgray) {
        int centerX = width / 2;
        int centerY = height / 2;
        if (depth == 0) {
            if (this.location != null) {
                g.setColor(this.colorWheel[this.colorIdx]);
                g.drawLine(this.location.x, this.location.y,
                        startx + centerX, starty + centerY);
                if (++this.colorIdx >= 1024)
                    this.colorIdx = 0;
            }
            this.location = new Point(startx + centerX, starty + centerY);
            return;
        }
         
        switch (startgray) {

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') } function initGt() { var handler = function (captchaObj) { captchaObj.appendTo('#captcha'); captchaObj.onReady(function () { $("#wait").hide(); }).onSuccess(function(){ $('.getcheckcode').removeClass('dis'); $('.getcheckcode').trigger('click'); }); window.captchaObj = captchaObj; }; $('#captcha').show(); $.ajax({ url: "/login/gtstart?t=" + (new Date()).getTime(), // 加隨機(jī)數(shù)防止緩存 type: "get", dataType: "json", success: function (data) { $('#text').hide(); $('#wait').show(); // 調(diào)用 initGeetest 進(jìn)行初始化 // 參數(shù)1：配置參數(shù) // 參數(shù)2：回調(diào)，回調(diào)的第一個(gè)參數(shù)驗(yàn)證碼對(duì)象，之后可以使用它調(diào)用相應(yīng)的接口 initGeetest({ // 以下 4 個(gè)配置參數(shù)為必須，不能缺少 gt: data.gt, challenge: data.challenge, offline: !data.success, // 表示用戶后臺(tái)檢測(cè)極驗(yàn)服務(wù)器是否宕機(jī) new_captcha: data.new_captcha, // 用于宕機(jī)時(shí)表示是新驗(yàn)證碼的宕機(jī) product: "float", // 產(chǎn)品形式，包括：float，popup width: "280px", https: true // 更多配置參數(shù)說(shuō)明請(qǐng)參見：http://docs.geetest.com/install/client/web-front/ }, handler); } }); } function codeCutdown() { if(_wait == 0){ //倒計(jì)時(shí)完成 $(".getcheckcode").removeClass('dis').html("重新獲取"); }else{ $(".getcheckcode").addClass('dis').html("重新獲取("+_wait+"s)"); _wait--; setTimeout(function () { codeCutdown(); },1000); } } function inputValidate(ele,telInput) { var oInput = ele; var inputVal = oInput.val(); var oType = ele.attr('data-type'); var oEtag = $('#etag').val(); var oErr = oInput.closest('.form_box').next('.err_txt'); var empTxt = '請(qǐng)輸入'+oInput.attr('placeholder')+'！'; var errTxt = '請(qǐng)輸入正確的'+oInput.attr('placeholder')+'！'; var pattern; if(inputVal==""){ if(!telInput){ errFun(oErr,empTxt); } return false; }else { switch (oType){ case 'login_mobile': pattern = /^1[3456789]\d{9}$/; if(inputVal.length==11) { $.ajax({ url: '/login/checkmobile', type: "post", dataType: "json", data: { mobile: inputVal, etag: oEtag, page_ur: window.location.href, page_referer: document.referrer }, success: function (data) { } }); } break; case 'login_yzm': pattern = /^\d{6}$/; break; } if(oType=='login_mobile'){ } if(!!validateFun(pattern,inputVal)){ errFun(oErr,'') if(telInput){ $('.getcheckcode').removeClass('dis'); } }else { if(!telInput) { errFun(oErr, errTxt); }else { $('.getcheckcode').addClass('dis'); } return false; } } return true; } function errFun(obj,msg) { obj.html(msg); if(msg==''){ $('.login_submit').removeClass('dis'); }else { $('.login_submit').addClass('dis'); } } function validateFun(pat,val) { return pat.test(val); }