用C#画圆与矩形

Graphics

晕 MSDN就有
myGraphics.DrawRectangle(myPen, 100, 50, 80, 40);
http://blog.csdn.net/stone0419/archive/2007/10/04/1811412.aspx

private void button1_Click(object sender, EventArgs e)
  {  Graphics _Graphics = Graphics.FromHwnd(pictureBox1.Handle);  _Graphics.DrawEllipse(new Pen(Brushes.Yellow, 2), GetEllopse(new Point(50, 50), 10));
  _Graphics.Dispose();  }
  /// <summary>
  /// 根据圆心和半径获取图形坐标
  /// </summary>
  /// <param name="p_CenterPoint">圆心</param>
  /// <param name="p_Radius">半径</param>
  /// <returns>坐标</returns>
  public Rectangle GetEllopse(Point p_CenterPoint, int p_Radius)
  {
  int _X = p_CenterPoint.X - p_Radius;
  int _Y = p_CenterPoint.Y - p_Radius;
  return new Rectangle(_X, _Y, p_Radius * 2, p_Radius * 2);
  }

Graphics g = e.Graphics; //创建画板
Pen p = new Pen(Color.Blue, 2);
g.DrawRectangle(p, 10, 10, 100, 100);//在画板上画矩形,起始坐标为(10,10),宽为,高为
g.DrawEllipse(p, 10, 10, 100, 100);//在画板上画椭圆,起始坐标为(10,10)

完全不是一个概念，你的地图不会是google或者其他网页上的吧？不然一个图你怎么会有经纬度信息？

把这个话与你八楼的话对比看一下，有些矛盾吧，逻辑或者表达
画圆->在圆上画经纬度？
有了经纬度（这个么可以自己定义的咯？）->画圆？

google上画？google上有自己的API呀

Graphics g = e.Graphics; //创建画板
Pen p = new Pen(Color.Blue, 2);
g.DrawRectangle(p, 10, 10, 100, 100);//在画板上画矩形,起始坐标为(10,10),宽为,高为
g.DrawEllipse(p, 10, 10, 100, 100);//在画板上画椭圆,起始坐标为(10,10)

#region GoogleMap
        /// <summary>
        /// GoogleMap
        /// </summary>
        ///点，线坐标
        public void GoogleMap(string allPoint, string allLine)
        {
            //webBrowser1.Navigate("http://localhost:2865/Default.aspx");            wbMap.ObjectForScripting = this;            string szWebBrowserText = @"
        <html>
        <head>
        <title></title>        <script src='http://maps.google.com/maps?file=api&v=2&sensor=true_or_false&key=ABQIAAAAuLMCs813ETPzKnClYiBwuhT2yXp_ZAY8_ufC3CFXhHIE1NvwkxRogqzInHtHXDyDOAQDeSX3MxNWbg'
        type='text/javascript'></script>

        <script type='text/javascript'>        function initialize()
        {
          if (GBrowserIsCompatible())
            {
              var map = new GMap2(document.getElementById('map'));
              map.setCenter(new GLatLng(26.157042, 111.269531), 6);
              map.setUIToDefault();              function createMarker(point, prompt)
              {
                  var baseIcon = new GIcon(G_DEFAULT_ICON);
                  baseIcon.shadow = 'http://www.google.com/mapfiles/shadow50.png';
                  baseIcon.iconSize = new GSize(20, 34);
                  baseIcon.shadowSize = new GSize(37, 34);
                  baseIcon.iconAnchor = new GPoint(9, 34);
                  baseIcon.infoWindowAnchor = new GPoint(9, 2);                   var redIcon = new GIcon(baseIcon);
                  redIcon.image = 'http://labs.google.com/ridefinder/images/mm_20_red.png';
                  erOptions = { icon:redIcon };
                  var er = new GMarker(point, erOptions);
                  GEvent.addListener(er, 'mouseover', function() {
                  er.openInfoWindowHtml(prompt);
                     });                  GEvent.addListener(er, 'click', function(){
                  var xlatlng = er.getLatLng();
                  window.external.ClickPoint(xlatlng.lat().toString(),xlatlng.lng().toString());
                     });                  return er;
              }              function createMarker02(point, prompt)
              {
                  var baseIcon = new GIcon(G_DEFAULT_ICON);
                  baseIcon.shadow = 'http://maps.google.com/mapfiles/arrowshadow.png';
                  baseIcon.iconSize = new GSize(20, 34);
                  baseIcon.shadowSize = new GSize(37, 34);
                  baseIcon.iconAnchor = new GPoint(9, 34);
                  baseIcon.infoWindowAnchor = new GPoint(9, 2);                   var redIcon = new GIcon(baseIcon);
                  redIcon.image = 'http://maps.google.com/mapfiles/arrow.png';
                  erOptions = { icon:redIcon };
                  var er = new GMarker(point, erOptions);
                  GEvent.addListener(er, 'mouseover', function() {
                  er.openInfoWindowHtml(prompt);
                     });                  GEvent.addListener(er, 'click', function(){
                  window.external.ClickMidPoint(prompt.toString());
                     });                  return er;
              }              " + allPoint + @"              " + allLine + @"
            }
        }         </script>

        </head>
        <body onload='initialize();' oncontextmenu='event.returnValue=false'>        <div id='map' style='width: 950px; height: 525px;'>
        </div>        </body>
        </html>";            wbMap.DocumentText = szWebBrowserText;
        }
        #endregion这个是C#利用google地图的一小段代码，

不是GOOGLE的，是用的我们自己的地图引擎。

在form paint 事件里
Graphics g = e.Grahpics
具体方法上面给出了。
或者在load事件里
Grahpics g = this.CreateGraphics();
或者在某个控件里
Grahpics g = button1.CreateGraphics();
在图片里
Bitmap mybit = new Bitmap(""e:/1.jpg);
graphics g = pictureBox1.CreateGraphics();

是桌面应用程序了，不是GOOGLE的API,只是用的他们的图片而已，就是要在图片上画圆啊

private void pictureBox1_Paint(object sender, PaintEventArgs e)
  {
  Rectangle r=new Rectangle(10,10,10,10); //圆
  e.Graphics.DrawEllipse(new Pen(Color.Red),r); //Graphics.DrawEllipse画椭圆
  }

画圆就是上面的代码
e.Graphics.DrawEllipse(new Pen(Color.Red),r); 关键就是得到这个e，看你的图片放在什么地方了，放在picturebox的话，就是paint里话，还要用个变量保存你这些点的信息

调试易

用C#画圆与矩形

解决方案 »