c#绘制点，线，多边形 - 黑马程序员技术交流社区

<p>private void button1_Click(object sender, EventArgs e)
{
using (Graphics x = Graphics.FromImage(flag))
{
x.Clear(Color.White);
//Brush brush = new SolidBrush(Color.Red);
Pen pen = new Pen(Color.Black, 1);
#region//这里有26个控制点的坐标是通过Calu方法计算得来的，所以看着有些怪异
Point ptA = new Point(Calu(0.00), picbox1.Width - Calu(0.00) - 10);//A
Point ptB = new Point(Calu(50.00), picbox1.Width - Calu(86.60) - 10);//B
Point ptC = new Point(Calu(100.00), picbox1.Width - Calu(0.00) - 10);//C
Point ptD = new Point(Calu(15.00), picbox1.Width - Calu(0.00) - 10);//D
....删减一部分...
#endregion
Point[] pt1 = new Point[5];
pt1[0] = ptL; pt1[1] = ptQ; pt1[2] = ptR; pt1[3] = ptM; pt1[4] = ptB;
x.DrawPolygon(pen, pt1);//绘制多边形区块1；（绘制一个多边形，他的顶点时pt1里边的五个点）
Rectangle rect = new Rectangle(drawPoint.X, drawPoint.Y, 3, 3);//定义矩形,参数为起点横纵坐标以及其长和宽</p><p> //单色填充
SolidBrush b1 = new SolidBrush(Color.Blue;//定义单色画刷
x.FillRectangle(b1, rect);//填充这个矩形(绘制一个点，并用一个3*3的矩形来表示它的位置)
x.DrawLine(pen,ptA ,ptB);(绘制一条线)
}
}
</p>

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