JavaScript调用自动化服务器的有关问题

JavaScript调用自动化服务器的问题
有一个自动化服务器程序，目的是将Richtext转换成图片。下面的代码是C#调用的代码。
using System;
using .......;
using System.Threading.Tasks;
using System.Runtime.InteropServices;
using Rtf2Img;

namespace Test
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        //测试的RTF字符串
        private string s = @"{\rtf1\ansi\ansicpg936\deff0\deflang1033\deflangfe2052{\fonttbl{\f0\fnil\fcharset134 \'cb\'ce\'cc\'e5;}}
{\colortbl ;\red255\green0\blue0;}
{\*\generator Msftedit 5.41.21.2510;}\viewkind4\uc1\pard\sa200\sl276\slmult1\cf1\lang2052\b\f0\fs144 a\cf0\super b\sub c\nosupersub\par
}";

        private void button1_Click(object sender, EventArgs e)
        {
            IRichText2Img b = new Rtf2Img.RichText2Img();  //创建自动化对象

            stdole.StdPicture a=null;   //定义图形对象
            b.RichTextToImage(s,pictureBox1.Width, pictureBox1.Height,ref a); //返回图形对象

            pictureBox1.Image = ImageConverter.IPictureToImage(a);    //把图像贴到PictureBox中        
        }
    }

    public class ImageConverter : System.Windows.Forms.AxHost
    {
        public ImageConverter() : base(null) { }

        public static stdole.IPictureDisp ImageToIPicture(System.Drawing.Image
        image)
        {
            return
                (stdole.IPictureDisp)System.Windows.Forms.AxHost.GetIPictureDispFromPicture(image);
        }

        public static System.Drawing.Image IPictureToImage(stdole.StdPicture
        picture)
        { 
           return 
              System.Windows.Forms.AxHost.GetPictureFromIPicture(picture); 
        }
    }
}

刚接触JavaScript，不知道是否可以用JS实现类似功能，把图片对象绘制到Html5的Canvas中。最好有示例性的代码，初学^-^。有劳各位帮忙！
------解决思路----------------------
参考http://www.w3school.com.cn/html5/html5_canvas.asp
http://javascript.ruanyifeng.com/htmlapi/canvas.html
------解决思路----------------------
drawImage方法就搞定了

<canvas id="canvas" style="width:500px;height:500px"></canvas>

<script>

    var canvas = document.getElementById("canvas");

    var ctx = canvas.getContext("2d");

    var img = new Image();

    img.src = "2.jpg";

    img.onload = function () {

        ctx.drawImage(img, 0, 0);

    }

</script>

参考：canvas对象drawImage方法