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
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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
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