VB.NET中怎么操作GDI图形
VB.NET中怎么操作GDI图形，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
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)
注释：/////////////VB.NET操作GDI图形绘制任意直线
Dim g As Graphics =
e.GraphicsDim mypen As Pen =
New Pen(Color.Red, 2)g.DrawLine(mypen,
100, 100, 10, 10)
注释：/////////////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)
注释：////////////VB.NET操作GDI图形文本表示
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!"
Dim solidbrush As SolidBrush
= New SolidBrush(Color.Red)
Dim pr As PointF =
New PointF(100, 10)
e.Graphics.DrawString
(text, font, solidbrush, pr)
注释：////////////VB.NET操作GDI图形平面绘制
Dim rec As RectangleF =
New RectangleF(10, 10,
200, 100)
g.DrawPie(mypen, rec,
150, 150)
注释：///////////封闭图形，0.7应该是个圆
g.DrawClosedCurve(mypen,
curvepoints, 0.7, Drawing.
Drawing2D.FillMode.Alternate)
注释：///////////大家自己试试看吧
g.DrawArc(mypen, 300, 300,
200, 200, 100, 100)
g.DrawCurve(mypen, curvepoints)
g.DrawBezier(mypen, 50, 50,
100, 50, 100, 100, 50, 100)
g.DrawBeziers(mypen, curvepoints)
注释：//////////这可是一个圆
Dim rec1 As RectangleF =
New RectangleF(10, 10, 100, 100)
g.DrawEllipse(mypen, rec1)
注释：//////////这是一个椭圆
Dim rec2 As RectangleF =
New RectangleF(10, 10, 200, 100)
g.DrawEllipse(mypen, rec2)
End Sub
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