VB.NET中使用GDI画图具体应用。

下面的例子通过重载Form1窗体的OnPaint()方法绘制GDI图形
Protected Overrides Sub onpaint(ByVal e As System.Windows.Forms.PaintEventArgs)
        '/////////////绘制任意直线
        Dim g As Graphics = e.Graphics
        Dim mypen As Pen = New Pen(Color.Red, 2)
        g.DrawLine(mypen, 100, 100, 10, 10)
        '/////////////绘制矩形(任意直线构成的封闭图形)
        Dim point1 As PointF = New PointF(100F, 100F)
        Dim point2 As PointF = New PointF(200F, 100F)
        Dim point3 As PointF = New PointF(200F, 200F)
        Dim point4 As PointF = New PointF(100F, 200F)
        Dim curvepoints As PointF() = {point1, point2, point3, point4}
        g.DrawPolygon(New Pen(Color.Blue, 2), curvepoints)
        '////////////文本表示
        Dim FFamily As FontFamily = New FontFamily("Arial")
        Dim font As Font = New Font(FFamily, "20", FontStyle.Bold, FontStyle.Italic, GraphicsUnit.Pixel)
        Dim text As String = "I love you!"