如下所述，请问在C#中Draw（）函数应该怎么用？

Question

Iam a LineIam a CircleIam a Square

Answer 1

　　用DrawCurve方法和DrawClosedCurve方法一样，用来绘制经过Point结构数组中每个点的闭合基数样条，但最后两个点之间不连线。常用的两个画线函数定义如下：
l void DrawPolygon(Pen pen,Point[] points);
l void DrawPolygon(Pen pen,PointF[] points);
例子5_7_9：使用DrawCurve方法，绘制有4个元素的Point结构数组定义的闭合基数样条闭合曲线如下图，为主窗体Paint事件增加事件处理函数如下：

　　private void Form1_Paint(object sender,System.Windows.Forms.PaintEventArgs e)
{  Graphics g=this.CreateGraphics();
Pen pen1=new Pen(Color.Red,3);
Point[] p1=new Point[]
{  new Point(10,10),
new Point(60,40),
new Point(100,80),
new Point(60,100)
};
g.DrawCurve(pen1,p1);
}

Answer 2

private void Form1_Paint(object sender, PaintEventArgs e)
{
e.Graphics.DrawLine(System.Drawing.Pens.Red, 1, 1,
50, 50);
}
你可以在form的paint事件中在form上绘制图形。上面是个例子。

Answer 3

你看看是不是这样子？
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics gh = this.CreateGraphics();
Pen pen1 = new Pen(Color.Red, 10);
Pen pen2 = new Pen(Color.Blue, 8);
SolidBrush brush1 = new SolidBrush(Color.Yellow);
gh.DrawLine(pen1, 100, 100, 400, 400);
gh.DrawEllipse(pen2, 300, 300, 600, 600);
gh.FillEllipse(brush1, 300, 300, 600, 600);
Rectangle rect=new Rectangle(600,600,200,200);
gh.DrawRectangle(pen1,rect);
}