C#实现网页画图功能

本文实例为大家分享了c#实现网页画图的具体代码，供大家参考，具体内容如下

代码贴着保存下

using system;
using system.collections;
using system.collections.generic;
using system.linq;
using system.web;
using system.web.ui;
using system.web.ui.webcontrols;
using system.io;
using system.drawing;
using system.drawing.drawing2d;
using system.drawing.imaging;
 
public partial class _default : system.web.ui.page
{
  int h = 1000;
  int w = 1000;
  protected void page_load(object sender, eventargs e)
  {
    bitmap img = new bitmap(h, w);//创建bitmap对象
    memorystream stream = draw();
 
    img.save(stream, imageformat.jpeg);     //保存绘制的图片
    response.clear();
    response.contenttype = "image/jpeg";
    response.binarywrite(stream.toarray());
  }
 
  public memorystream draw()
  {
    string[] words = {"壹","贰","叁","肆","伍","陆"};
    bitmap img = new bitmap(h, w);//创建bitmap对象
    graphics g = graphics.fromimage(img);//创建graphics对象
    g.drawrectangle(new pen(color.white, img.height), 2, 2, img.width - 2, img.height - 2); //矩形 底色
 
 
    arraylist coordinate = getxy(words.length,img.height,img.width);
    arraylist radius = new arraylist();
 
    var r = new random();
    color mycolor = color.fromargb(r.next(100, 150), r.next(255), r.next(255), r.next(255));
 
    font font = new font("arial", 20);// 字体
    lineargradientbrush font_brush = new lineargradientbrush(new rectangle(0, 0, img.width, img.height), color.black, color.black, 1.2f, true);
 
    int j = 0;
    //画圆 写字
    foreach (point p in coordinate)
    {
      int r = r.next(20, 40);
      radius.add(r);
      solidbrush bush = new solidbrush(mycolor);
      g.fillellipse(bush, p.x - r, p.y - r, 2*r, 2*r);//画填充椭圆的方法，x坐标、y坐标、宽、高：
 
      g.drawstring(words[j++], font, font_brush, p); // 标记
    }
 
    //连线
    var pencolor = color.fromargb(140, r.next(255), r.next(255), r.next(255));
    for (int i = 1; i < coordinate.count; i++) 
    {
      pen pen = new pen(pencolor, 2);
      g.drawline(pen, (point)coordinate[0], (point)coordinate[i]);
    }
    
    memorystream stream = new memorystream();  //保存绘制的图片
    img.save(stream, imageformat.jpeg);     //保存绘制的图片
    return stream;
  }
 
  private arraylist getxy(int len, int h, int w) 
  {
    arraylist al = new arraylist();
    double d = 50.0;
    var r = new random();
    int h1 = (int)(0.1 * h);
    int h2 = (int)(0.9 * h);
    int w1 = (int)(0.1 * w);
    int w2 = (int)(0.9 * w);
 
    while (al.count < len) 
    {
      point p = new point(r.next(h1,h2), r.next(w1,w2));
      bool add = true;
      foreach (point q in al) 
      {
        if (dist(p, q) < d)
        {
          add = false;
          break;
        }
      }
      if (add)
        al.add(p);
 
    }
 
    return al;
  }
 
  private double dist(point p1,point p2) 
  {
    return math.sqrt(math.abs(p1.x - p2.x) * math.abs(p1.x - p2.x) + math.abs(p1.y - p2.y) * math.abs(p1.y - p2.y));
  }
}

效果如下

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。