使用 svg.js 清除并重新绘制

Clear and re-draw using svg.js

我想使用 svg.js 绘制一些元素,然后清除 canvas 并绘制新元素。我正在使用 draw.clear() but when I re-draw the elements, they aren't visible. Is this approach correct or am I missing something? I also tried remove().

var width = 500;
var height = 500;

var pos_x = 0;
var pos_y = 0;

var texto = [];
var grupo = [];
var rect = [];
var clip = [];
var random_rotation = [];

var latino = 'ABCDEFGHIJKLMNOPQRSTUVXYZ'.split('');
var cirilico = 'АБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЬЮЯ'.split('');
var hebreo = 'אבגדהוזיךכל   םמןנסעףפפצקחט   '.split('');
var griego = 'ΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨ'.split('');
var arabe = 'ابتثجحخدذرزسشصضطظعغفقكلمنهويةءأإ'.split('');
var coreano = 'ㅏㅑㅓㅕㅗㅛㅜㅠㅡㅣㅐㅒㅔㅖㅘㅙㅚㅝㅞㅟㅢㄱㄴㄷㄹㅁㅂㅅㅇㅈㅊㅋㅌㅍㅎㄲㄸㅃㅆㅉㄳㄵㄶㄺㄻㄿㄽㄾㄿㅀㅄ'.split('');
var glagolitico = 'ⰀⰁⰂⰃⰄⰅⰆⰇⰈⰉⰊⰋⰌⰍⰎⰏⰐⰑⰒⰓⰔⰕⰖⰗⰘⰙⰚⰛⰜⰝⰞⰟⰠⰡⰢⰣⰤⰥⰦⰧⰨⰩⰪⰫⰬⰭⰮ'.split('');
var hiragana = 'あかさたなはまやらわがざだばぱいきしちにひみり(ゐ)ぎじぢびぴうくすつぬふむゆるぐずづぶぷえけせてねへめれ(ゑ)げぜでべぺおこそとのほもよろをごぞどぼぽ'.split('');
var katakana = 'アカサタナハマヤラワガザダバパヴァイキシチニヒミリ(ヰ)ギジヂビピヴィウクスツヌフムユルグズヅブプヴエケセテネヘメレ(ヱ)ゲゼデベペヴェオコソトノホモヨロヲゴゾドボポヴォ'.split('');

var sistemas = [latino, cirilico, hebreo, griego, arabe, coreano, glagolitico, hiragana, katakana];

var alfabeto = [];
var letra = [];

var draw = SVG().addTo('.container').size(width, height).attr({id: 'svg'}); 

function getRndInteger(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

function getRndFloat(min, max) {
  return (Math.random() * (max - min)) + min;
}

// Create symbols
function grafema(){
    for (var i = 0; i <= 3; i++){

        alfabeto[i] = getRndInteger(0, sistemas.length - 1);

        letra[i] = sistemas[alfabeto[i]][getRndInteger(0, sistemas[alfabeto[i]].length - 1)];

        random_rotation[i] = getRndInteger(0, 360);

        texto[i] = draw.text(letra[i])
                    .font({
                        family: 'Arial Unicode MS',
                        size: 500,
                        anchor: 'middle'
                    })
                    .transform({
                        translateX: width/2,
                        translateY: (height/2) * -1,
                        rotate: random_rotation[i],
                        scale: getRndFloat(0.5, 0.6)
                    });

        grupo[i] = draw.group()
                    .attr({
                        id: 'letra ' + i
                    });

        grupo[i].add(texto[i]);

        rect[i] = draw.rect(200, 200)
                    .attr({
                        x: pos_x,
                        y: pos_y,
                    })
                    .transform({
                        rotate : random_rotation[i],
                    });

        pos_x = pos_x + 200;

        if (pos_x > 200) {
            pos_x = 0;
            pos_y = pos_y + 200;
        }

        clip[i] = draw.clip().add(rect[i]);
        grupo[i].clipWith(clip[i]);
    }
}

grafema();
draw.clear();
grafema();

这是我尝试创建的程序的简化版本。将来我想在用户点击时清除并重新绘制。

您的代码中的问题不是 clear() 方法。您正在使用全局变量 pos_xpos_y 并且您正在递增它们。在您的第二幅图中,图像位于可见区域之外。要解决您的问题,请在 grafema 函数的开头初始化这些变量:

// ...
function grafema() {
    pos_x = 0;
    pos_y = 0;
    for (var i = 0; i <= 3; i++) {
        // ...

无限图纸执行示例:

https://jsbin.com/mehuholiwo/edit?js,output