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vb.net 畫圖 如何保持圖形
不用PictureBoxTest.Image屬性，直接把圖形繪制到PictureBoxTest上面就可以了。
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Dim?button?As?Integer?=?0
Private?Sub?Button1_Click(ByVal?sender?As?Object,?ByVal?e?As?EventArgs)?_
Handles?Button1.Click
Using?g?As?Graphics?=?Graphics.FromHwnd(PictureBoxTest.Handle)
Dim?penRed?As?Pen?=?New?Pen(Color.Red,?1)?????'定義紅色畫筆??
Dim?penblue?As?Pen?=?New?Pen(Color.Blue,?1)?'定義藍(lán)色畫筆?
If?button?=?0?Then
g.DrawLine(penRed,?0,?0,?100,?100)
button?=?1
ElseIf?button?=?1?Then
g.DrawLine(penblue,?100,?100,?200,?200)
button?=?0
End?If
End?Using
End?Sub
vb.net繪制曲線圖
。net ?其實(shí)還是很好繪制圖形的
你可以看下?Graphics ?類
Dim d As New Bitmap(Me.Width, Me.Height) ?‘一個(gè)圖片吧
? Dim g As Graphics = Graphics.FromImage(d)’繪制 ?準(zhǔn)備在這個(gè)圖片是進(jìn)行
然后 ?就是你繪制的東西了
線 就是 ??g.DrawLine()
圓 弧度 ?就用 ?g.DrawArc(Pens.Black, New Rectangle(0, 0, 400, 200), 0, 360)
復(fù)雜的就是 ? ? ?g.DrawBezier()
等 ?如果你用的是 VS的 ?編譯 ?上面都有詳細(xì)的參數(shù)說(shuō)明
Dim?d?As?New?Bitmap(Me.Width,?Me.Height)
Dim?g?As?Graphics?=?Graphics.FromImage(d)
g.DrawArc(Pens.Black,?New?Rectangle(0,?0,?200,?200),?0,?360)
g.DrawLine(Pens.Red,?New?Point(0,?0),?New?Point(200,?200))
g.DrawLines(Pens.Green,?New?Point()?{New?Point(0,?0),?New?Point(50,?40),?New?Point(50,?80),?New?Point(90,?70),?New?Point(100,?400)})
g.DrawBezier(Pens.Yellow,?New?Point(0,?100),?New?Point(0,?0),?New?Point(200,?0），?New?Point(200,?200))
g.Dispose()
Me.BackgroundImage?=?d
VB.net中如何畫圖？
分類: 電腦/網(wǎng)絡(luò) 程序設(shè)計(jì) 其他編程語(yǔ)言
問(wèn)題描述:
VB6中的form1.circle (100,200),rgb(0,255,0)的語(yǔ)句如何在VB中使用??？
急用?。。。。。。。?！
解析:
VB與VB不同。
VB已經(jīng)有專門繪圖的類。
可以定義筆刷然后用Drawing類中的方法繪制。
Private Sub DrawEllipse()
Dim myPen As New System.Drawing.Pen(System.Drawing.Color.Red)
Dim formGraphics as System.Drawing.Graphics
formGraphics = Me.CreateGraphics()
formGraphics.DrawEllipse(myPen, New Rectangle(0,0,200,300))
myPen.Dispose()
formGraphics.Dispose()
End Sub
Private Sub DrawRectangle()
Dim myPen As New System.Drawing.Pen(System.Drawing.Color.Red)
Dim formGraphics as System.Drawing.Graphics
formGraphics = Me.CreateGraphics()
formGraphics.DrawRectangle(myPen, New Rectangle(0,0,200,300))
myPen.Dispose()
formGraphics.Dispose()
End Sub
關(guān)于vb.net中繪圖并保存圖片的問(wèn)題
Imports System.Drawing.Imaging
Public Class Form1
Dim imageName As String = "C:\Documents and Settings\...\1126.jpg "
Dim i As Image = Image.FromFile(imageName)
Dim g As Graphics = Graphics.FromImage(i) '此處從背景圖創(chuàng)建Greaphics
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'劃線
Dim BluePen As New Pen(Color.Blue, 5)
BluePen.DashStyle = Drawing2D.DashStyle.Solid
g.DrawLine(BluePen, 100.0F, 170, 500.0F, 170)
g.Dispose()
PictureBox1.Image = i
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
'退出
Me.Close()
End Sub
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
'存盤
i.Save( "C:\testimage.jpg ", ImageFormat.Jpeg)
i.Dispose()
End Sub
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
PictureBox1.Image = i
End Sub
End Class
名稱欄目：vbnet畫圖 vbnet圖像處理
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