C# 无法引用System.Drawing.Drawing2D
在用C#编写Windows Mobile程序时，需要调用GraphicsPath()方法绘图，已经引用了System.Drawing.Drawing2D（using System.Drawing.Drawing2D）,但是当编译GraphicsPath gx = new GraphicsPath();时仍然报错，显示“找不到类型或命名空间名称“GraphicsPath“（是否缺少using指令或程序及引用）”在两台电脑上都试验过了，C#初学者，希望给出具体的解决方案，谢谢 --------------------编程问答-------------------- GraphicsPath这个类在Windows Mobile当中不支持。 --------------------编程问答-------------------- 那在Windows Mobile中如何绘制圆角矩形啊，想做个按钮 --------------------编程问答-------------------- 下面的DrawRoundedRect方法，LZ自己参考下。C# code
//画圆角
public static void DrawRoundedRect(Graphics g, Pen p, Color backColor, Rectangle rc, Size size)
{
Point[] points = new Point[8];
//圆角的八个点
points[0].X = rc.Left + size.Width / 2;
points[0].Y = rc.Top + 1;
points[1].X = rc.Right - size.Width / 2;
points[1].Y = rc.Top + 1;
points[2].X = rc.Right;
points[2].Y = rc.Top + size.Height / 2;
points[3].X = rc.Right;
points[3].Y = rc.Bottom - size.Height / 2;
points[4].X = rc.Right - size.Width / 2;
points[4].Y = rc.Bottom;
points[5].X = rc.Left + size.Width / 2;
points[5].Y = rc.Bottom;
points[6].X = rc.Left + 1;
points[6].Y = rc.Bottom - size.Height / 2;
points[7].X = rc.Left + 1;
points[7].Y = rc.Top + size.Height / 2;
//圆角矩形的填充背景色
Brush fillBrush = new SolidBrush(backColor);
//画转角的线
g.DrawLine(p, rc.Left + size.Width / 2, rc.Top,
rc.Right - size.Width / 2, rc.Top);
g.FillEllipse(fillBrush, rc.Right - size.Width, rc.Top,
size.Width, size.Height);
g.DrawEllipse(p, rc.Right - size.Width, rc.Top,
size.Width, size.Height);
g.DrawLine(p, rc.Right, rc.Top + size.Height / 2,
rc.Right, rc.Bottom - size.Height / 2);
g.FillEllipse(fillBrush, rc.Right - size.Width, rc.Bottom - size.Height,
size.Width, size.Height);
g.DrawEllipse(p, rc.Right - size.Width, rc.Bottom - size.Height,
size.Width, size.Height);
g.DrawLine(p, rc.Right - size.Width / 2, rc.Bottom,
rc.Left + size.Width / 2, rc.Bottom);
g.FillEllipse(fillBrush, rc.Left, rc.Bottom - size.Height,
size.Width, size.Height);
g.DrawEllipse(p, rc.Left, rc.Bottom - size.Height,
size.Width, size.Height);
g.DrawLine(p, rc.Left, rc.Bottom - size.Height / 2,
rc.Left, rc.Top + size.Height / 2);
g.FillEllipse(fillBrush, rc.Left, rc.Top,
size.Width, size.Height);
g.DrawEllipse(p, rc.Left, rc.Top,
size.Width, size.Height);
//填充多边形，以消去不连续区
g.FillPolygon(fillBrush, points);
//Dispose 资源
fillBrush.Dispose();
}
--------------------编程问答-------------------- 你说的是在手机上不支持吧。有这个可能 --------------------编程问答-------------------- 手机不支持GraphicsPath。。。。。 --------------------编程问答-------------------- 这个看msdn, 里面很清楚标识哪些API是wm下开发所支持的 --------------------编程问答-------------------- 用于Windows Mobile平台免费的图形开发包
.Net Framework提供了 System.Drawing ,System.Drawing.Drawing2D 用于二维图形开发，但有相当一部分没有在 Windows Compact Framework 得到支持。
如 Pen的 .LineJoin .LineCap 已及 各种二维图形类。如 Arc, Area, Polyline, Polygon, Path.
这里提供一个免费的 用于Windows Mobile平台图形开发包。基本提供了 Desktop 平台 System.Drawing.Drawing2D 功能。
下面是一个简单的实例，用各种几何图形拼出一个Pear.(来源于经典Java示例），其他例子 Colors, Polys, Pahts, LineJoin,LineCap 见附件 http://download.csdn.net/source/2736333 --------------------编程问答--------------------
Ellipse circle, oval, leaf, stem;
Area circ, ov, leaf1, leaf2, st1, st2;
circle = new Ellipse();
oval = new Ellipse();
leaf = new Ellipse();
stem = new Ellipse();
circ = new Area(circle);
ov = new Area(oval);
leaf1 = new Area(leaf);
leaf2 = new Area(leaf);
st1 = new Area(stem);
st2 = new Area(stem);
graphics2D.Reset();
graphics2D.Clear(Color.White);
int w = screenWidth;
int h = screenHeight;
int ew = w / 2;
int eh = h / 2;
SolidBrush brush = new SolidBrush(Color.Green);
graphics2D.DefaultBrush = brush;
// Creates the first leaf by filling the intersection of two Area
//objects created from an ellipse.
leaf.SetFrame(ew - 16, eh - 29, 15, 15);
leaf1 = new Area(leaf);
leaf.SetFrame(ew - 14, eh - 47, 30, 30);
leaf2 = new Area(leaf);
leaf1.Intersect(leaf2);
graphics2D.Fill(null, leaf1);
// Creates the second leaf.
leaf.SetFrame(ew + 1, eh - 29, 15, 15);
leaf1 = new Area(leaf);
leaf2.Intersect(leaf1);
graphics2D.Fill(null, leaf2);
brush = new SolidBrush(Color.Black);
graphics2D.DefaultBrush = brush;
// Creates the stem by filling the Area resulting from the
//subtraction of two Area objects created from an ellipse.
stem.SetFrame(ew, eh - 42, 40, 40);
st1 = new Area(stem);
stem.SetFrame(ew + 3, eh - 47, 50, 50);
st2 = new Area(stem);
st1.Subtract(st2);
graphics2D.Fill(null, st1);
brush = new SolidBrush(Color.Yellow);
graphics2D.DefaultBrush = brush;
// Creates the pear itself by filling the Area resulting from the
//union of two Area objects created by two different ellipses.
circle.SetFrame(ew - 25, eh, 50, 50);
oval.SetFrame(ew - 19, eh - 20, 40, 70);
circ = new Area(circle);
ov = new Area(oval);
circ.Add(ov);
graphics2D.Fill(null, circ);
Invalidate();
--------------------编程问答--------------------
补充：移动开发 , Windows Phone
