如何在不创建数组的情况下使用NgFor生成矩阵UI模式

我想实现应该动态生成的UI矩阵模式. 通过接收输入参数，它应该确定什么是UI矩阵模式尺寸: 例如9X3元素: 模式9x3元素

I would like to implement UI matrix pattern, which should generate dynamically. By receiving input parameter it should decide what would be UI matrix pattern dimensions: For example 9X3 elements: pattern 9x3 elements

我使用Angular2.js，打字稿，SCSS.

I use Angular2.js, typescript, SCSS.

html模板和.ts外观:

html tamplate and .ts looks:

import {Component, Input, OnInit} from 'angular2/core';
import {NgFor} from 'angular2/common';

@Component({
  selector   : 'game-pattern',
  moduleId   : module.id,
  templateUrl: 'game-pattern.component.html',
  styleUrls  : ['game-pattern.component.css'],
  directives : [NgFor],
})
export class GamePatternComponent implements OnInit {
  @Input('CardType') public cardType: number;

  public horizontalElementLocation: number;
  public verticalElementLocation: number;
  public rows: number[]     = [];
  public elements: number[] = [];
  public y: number;
  public x: number;

 // public cardType = 3;
 constructor() {
    this.cardType = 3;
  }

  public ngOnInit() {
    console.log('cardType ' + this.cardType);
    this.chooseGamePattern();
  }

  public chooseGamePattern() {
    if (this.cardType === 3) {
      this.horizontalElementLocation = 9;
      this.verticalElementLocation   = 3;
    }

    for (this.y = 0; this.y < this.verticalElementLocation; this.y++) {
      this.rows[this.y] = 0;
      for (this.x = 0; this.x < this.horizontalElementLocation; this.x++) {
        this.elements[this.x] = 0;
      }
    }
  }
}

<div id="game-pattern" >
  <div class="pattern-row" *ngFor="#row of rows">
    <div class="big-circle" *ngFor="#elemnt of elements"> 
      <div class="small-circle"></div>
    </div>
  </div>
</div>

**此代码无法在此环境中运行:)*

** this code could not run in this environment :)*

问题: 如何在不创建数组来生成UI的情况下使用NgFor. 我的意思是，如果我将收到输入x = 9和y = 3，则应建立9X3的UI矩阵模式. 请指教:)

Question: How can I use NgFor without creating arrays to generate UI. I mean, if I will receive input x=9 and y=3 it should build UI matrix pattern of 9X3. Please advise :)

谢谢.