VB.NET编程语言在对图形的操作上可以体现出其全面和灵活性。我们可以通过VB.NET操作GDI图形的相关操作方法和实现的功能来对这一方面的知识进行一个系统的认识,了解VB.NET在操作中的简便灵活性。#t#
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)
注释://///////////VB.NET操作GDI图形绘制任意直线
- Dim g As Graphics =
e.Graphics - Dim mypen As Pen =
New Pen(Color.Red, 2) - g.DrawLine(mypen,
100, 100, 10, 10)
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)
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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)
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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)
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注释:///////////封闭图形,0.7应该是个圆
g.DrawClosedCurve(mypen,
curvepoints, 0.7, Drawing.
Drawing2D.FillMode.Alternate)
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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)
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注释://////////这可是一个圆
Dim rec1 As RectangleF =
New RectangleF(10, 10, 100, 100)
g.DrawEllipse(mypen, rec1)
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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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VB.NET操作GDI图形的各种操作技巧就为大家介绍到这里。