ng-captcha
Version:
A pure front-end angular captcha module.
185 lines • 17.8 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
import { Component, ViewChild, Output, EventEmitter, Input } from '@angular/core';
var CaptchaComponent = /** @class */ (function () {
function CaptchaComponent() {
this.generateCode = new EventEmitter();
this.canvas = document.createElement('canvas');
this.letters = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "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", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"];
this.code = '';
}
/**
* @return {?}
*/
CaptchaComponent.prototype.ngOnInit = /**
* @return {?}
*/
function () {
this.init();
this.refresh();
};
/**
* @return {?}
*/
CaptchaComponent.prototype.onClick = /**
* @return {?}
*/
function () {
this.refresh();
};
/**
* @return {?}
*/
CaptchaComponent.prototype.init = /**
* @return {?}
*/
function () {
this.canvas.width = this.width || 100;
this.canvas.height = this.height || 50;
this.canvas.style.cursor = 'pointer';
this.canvas.innerHTML = '您的浏览器版本不支持canvas';
this.container.nativeElement.appendChild(this.canvas);
};
// generate code
// generate code
/**
* @return {?}
*/
CaptchaComponent.prototype.refresh =
// generate code
/**
* @return {?}
*/
function () {
this.code = '';
/** @type {?} */
var ctx = this.canvas.getContext('2d');
ctx.textBaseline = 'middle';
ctx.fillStyle = this.randomColor(180, 240);
ctx.fillRect(0, 0, this.canvas.width, this.canvas.height);
for (var i = 0; i < 4; i++) {
/** @type {?} */
var letter = this.letters[this.randomNum(0, this.letters.length)];
this.code += letter;
ctx.font = this.randomNum(this.canvas.height / 2, this.canvas.height) + 'px SimHei';
ctx.fillStyle = this.randomColor(50, 160);
ctx.shadowOffsetX = this.randomNum(-3, 3);
ctx.shadowOffsetY = this.randomNum(-3, 3);
ctx.shadowBlur = this.randomNum(-3, 3);
ctx.shadowColor = 'rgb(0, 0, 0, 0.3)';
/** @type {?} */
var x = this.canvas.width / 5 * i;
/** @type {?} */
var y = this.canvas.height / 2;
/** @type {?} */
var deg = this.randomNum(-30, 30)
// setting rotate and origin point
;
// setting rotate and origin point
ctx.translate(x, y);
ctx.rotate(deg * Math.PI / 180);
ctx.fillText(letter, 0, 0);
// reset rotate and origin point
ctx.rotate(-deg * Math.PI / 180);
ctx.translate(-x, -y);
}
// draw interfering line
for (var i = 0; i < 4; i++) {
ctx.strokeStyle = this.randomColor(40, 180);
ctx.beginPath();
ctx.moveTo(this.randomNum(0, this.canvas.width), this.randomNum(0, this.canvas.height));
ctx.lineTo(this.randomNum(0, this.canvas.width), this.randomNum(0, this.canvas.height));
ctx.stroke();
}
// draw interfering point
for (var i = 0; i < this.canvas.width / 4; i++) {
ctx.fillStyle = this.randomColor();
ctx.beginPath();
ctx.arc(this.randomNum(0, this.canvas.width), this.randomNum(0, this.canvas.height), 1, 0, 2 * Math.PI);
ctx.fill();
}
this.generateCode.emit(this.code.toLowerCase());
};
/**
* return a random integer
* @param min 最小值
* @param max 最大值
*/
/**
* return a random integer
* @param {?} min 最小值
* @param {?} max 最大值
* @return {?}
*/
CaptchaComponent.prototype.randomNum = /**
* return a random integer
* @param {?} min 最小值
* @param {?} max 最大值
* @return {?}
*/
function (min, max) {
return Math.floor(Math.random() * (max - min) + min);
};
/**
* return a random color
*/
/**
* return a random color
* @param {?=} min
* @param {?=} max
* @return {?}
*/
CaptchaComponent.prototype.randomColor = /**
* return a random color
* @param {?=} min
* @param {?=} max
* @return {?}
*/
function (min, max) {
if (min === void 0) { min = 0; }
if (max === void 0) { max = 255; }
/** @type {?} */
var r = this.randomNum(min, max);
/** @type {?} */
var g = this.randomNum(min, max);
/** @type {?} */
var b = this.randomNum(min, max);
return "rgb(" + r + ", " + g + ", " + b + ")";
};
CaptchaComponent.decorators = [
{ type: Component, args: [{
selector: 'captcha',
template: "<div class=\"captcha-container\" #captchaContainer (click)=\"onClick()\"></div>",
styles: [".captcha-container{display:inline-block;line-height:0}"]
}] }
];
/** @nocollapse */
CaptchaComponent.ctorParameters = function () { return []; };
CaptchaComponent.propDecorators = {
width: [{ type: Input }],
height: [{ type: Input }],
generateCode: [{ type: Output }],
container: [{ type: ViewChild, args: ['captchaContainer',] }]
};
return CaptchaComponent;
}());
export { CaptchaComponent };
if (false) {
/** @type {?} */
CaptchaComponent.prototype.width;
/** @type {?} */
CaptchaComponent.prototype.height;
/** @type {?} */
CaptchaComponent.prototype.generateCode;
/** @type {?} */
CaptchaComponent.prototype.container;
/** @type {?} */
CaptchaComponent.prototype.canvas;
/** @type {?} */
CaptchaComponent.prototype.letters;
/** @type {?} */
CaptchaComponent.prototype.code;
}
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{ Component, OnInit, ViewChild, Output, EventEmitter, Input } from '@angular/core';\n\n@Component({\n  selector: 'captcha',\n  templateUrl: './captcha.component.html',\n  styleUrls: ['./captcha.component.css']\n})\nexport class CaptchaComponent implements OnInit {\n\n  @Input() width\n  @Input() height\n  @Output() generateCode = new EventEmitter()\n  @ViewChild('captchaContainer') container\n  canvas = document.createElement('canvas')\n  letters = [\"0\", \"1\", \"2\", \"3\", \"4\", \"5\", \"6\", \"7\", \"8\", \"9\", \"a\", \"b\", \"c\", \"d\", \"e\", \"f\", \"g\", \"h\", \"i\", \"j\", \"k\", \"l\", \"m\", \"n\", \"o\", \"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\", \"O\", \"P\", \"Q\", \"R\", \"S\", \"T\", \"U\", \"V\", \"W\", \"X\", \"Y\", \"Z\"]\n  code = ''\n\n  constructor() { }\n\n  ngOnInit() {\n    this.init()\n    this.refresh()\n  }\n\n  onClick() {\n    this.refresh()\n  }\n\n  private init() {\n    this.canvas.width = this.width || 100\n    this.canvas.height = this.height || 50\n    this.canvas.style.cursor = 'pointer'\n    this.canvas.innerHTML = '您的浏览器版本不支持canvas'\n    this.container.nativeElement.appendChild(this.canvas)\n  }\n\n  // generate code\n  private refresh() {\n    this.code = ''\n    const ctx = this.canvas.getContext('2d')\n    ctx.textBaseline = 'middle'\n    ctx.fillStyle = this.randomColor(180, 240)\n    ctx.fillRect(0, 0, this.canvas.width, this.canvas.height)\n\n    for (let i = 0; i < 4; i++) {\n      const letter = this.letters[this.randomNum(0, this.letters.length)]\n      this.code += letter\n      ctx.font = this.randomNum(this.canvas.height / 2, this.canvas.height) + 'px SimHei'\n      ctx.fillStyle = this.randomColor(50, 160)\n      ctx.shadowOffsetX = this.randomNum(-3, 3)\n      ctx.shadowOffsetY = this.randomNum(-3, 3)\n      ctx.shadowBlur = this.randomNum(-3, 3)\n      ctx.shadowColor = 'rgb(0, 0, 0, 0.3)'\n      const x = this.canvas.width / 5 * i\n      const y = this.canvas.height / 2\n      const deg = this.randomNum(-30, 30)\n      // setting rotate and origin point\n      ctx.translate(x, y)\n      ctx.rotate(deg * Math.PI / 180)\n      ctx.fillText(letter, 0, 0)\n      // reset rotate and origin point\n      ctx.rotate(-deg * Math.PI / 180)\n      ctx.translate(-x, -y)\n    }\n\n    // draw interfering line\n    for (let i = 0; i < 4; i++) {\n      ctx.strokeStyle = this.randomColor(40, 180)\n      ctx.beginPath()\n      ctx.moveTo(this.randomNum(0, this.canvas.width), this.randomNum(0, this.canvas.height))\n      ctx.lineTo(this.randomNum(0, this.canvas.width), this.randomNum(0, this.canvas.height))\n      ctx.stroke()\n    }\n\n    // draw interfering point\n    for (let i = 0; i < this.canvas.width / 4; i++) {\n      ctx.fillStyle = this.randomColor()\n      ctx.beginPath()\n      ctx.arc(this.randomNum(0, this.canvas.width), this.randomNum(0, this.canvas.height), 1, 0, 2 * Math.PI)\n      ctx.fill()\n    }\n\n    this.generateCode.emit(this.code.toLowerCase())\n  }\n\n  /**\n   * return a random integer\n   * @param min 最小值\n   * @param max 最大值\n   */\n  private randomNum(min, max) {\n    return Math.floor(Math.random() * (max - min) + min)\n  }\n\n  /**\n   * return a random color\n   */\n  private randomColor(min = 0, max = 255) {\n    const r = this.randomNum(min, max)\n    const g = this.randomNum(min, max)\n    const b = this.randomNum(min, max)\n    return `rgb(${r}, ${g}, ${b})`\n  }\n\n}\n"]}