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VB.net与VB不同。
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VB.net已经有专门绘图的类。
可以定义笔刷然后用Drawing类中的方法绘制。
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
继承（Inherits）控件就可以重写它的属性和方法，图标可以在paint中重绘，用gdi，工具主要在drawing和drawing2d中。
combobox弹出的框增加图标吗？个人看法可能需要得到那个句柄，才可以重绘，但那个好像是一体的，不知道能不能弄到句柄。
textbox可以自定义高度。只是以行高度为单位，改变字体大小即可，没必要重写吧。
我也自学，感觉基础容易学，进阶资料少。循序渐进也没序可循，基本是在摸索。
都是想到什么问题，就立下一个目标，然后攻破他，结果可能是尝试几天后，发现目标超出能力范围。
晦涩是相对的，实践出真知，多动手，基础就好了。
Imports System
Imports System.IO
Public Class Form2
Private mBmpBuffer As Bitmap
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
mBmpBuffer = New Bitmap(Me.PictureBox1.Width, Me.PictureBox1.Height, Me.PictureBox1.CreateGraphics) Dim g As Graphics = Graphics.FromImage(mBmpBuffer)
Dim i As Integer
Dim aa(3, 1) As Single
Dim stra() As String
Try
Dim sr As StreamReader = New StreamReader("D:\模型相关\modeldesign\modelpaint\data.csv")
Dim line As String
Do
line = sr.ReadLine() i = i + 1
If i 1 Then
stra = Split(line, ";")
aa(i - 2, 0) = Val(stra(0))
aa(i - 2, 1) = Val(stra(1))
End If Loop Until line Is Nothing
sr.Close()
Catch ex As Exception End Try Dim ix As Single
Dim iy As Single
Dim temp As Single temp = aa(0, 0)
For i = 0 To 3
If aa(i, 0) temp Then
temp = aa(i, 0)
End If
Next
ix = temp temp = aa(0, 1)
For i = 0 To 3
If aa(i, 1) temp Then
temp = aa(i, 1)
End If
Next
iy = temp
'变换坐标
Dim bx As Single
Dim by As Single bx = PictureBox1.Width / ix
by = PictureBox1.Height / iy 'Dim g As Graphics = Me.PictureBox1.CreateGraphics
g.Clear(Color.White)
Dim mypoint(3) As Point
Dim n As Integer = 3
'变换坐标原点
g.TranslateTransform(PictureBox1.Width / 15, PictureBox1.Height * 14 / 15)
'g.ScaleTransform(PictureBox1.Width / ix, PictureBox1.Height / iy) '绘制坐标轴
Dim mypen As New Pen(Color.Black)
Dim sb As New SolidBrush(Color.Black)
'Dim sb1 As Brush = Brushes.Red
Dim mypen1 As New Pen(Color.Blue, 6)
g.DrawLine(mypen, 0, 0, PictureBox1.Width - 40, 0)
g.DrawLine(mypen, 0, 0, 0, 20 - PictureBox1.Height)
For i = 0 To PictureBox1.Width - 40 Step 40
g.DrawLine(mypen, i, 0, i, -10)
g.DrawString(Int(i / 0.9 / bx), New Font("宋体", 8), sb, i - 10, 0)
Next
g.DrawString("C", New Font("宋体", 8), sb, PictureBox1.Width - 50, 0) For i = 40 To PictureBox1.Height - 40 Step 40
g.DrawLine(mypen, 0, -i, 10, -i)
g.DrawString(Int(i / 0.9 / by), New Font("宋体", 8), sb, -20, -i - 10)
Next
g.DrawString("x", New Font("宋体", 8), sb, -10, 20 - PictureBox1.Height)
'mypen.Width = 1
g.SmoothingMode = Drawing2D.SmoothingMode.AntiAlias
For i = 0 To n
mypoint(i).X = aa(i, 0) * bx * 0.9
mypoint(i).Y = -aa(i, 1) * by * 0.9
'g.FillRectangle(sb1, mypoint(i).X, mypoint(i).Y, 3, mypoint(i).Y)
g.DrawLine(mypen1, mypoint(i).X, 0, mypoint(i).X, mypoint(i).Y)
Next '开始画线
'g.DrawCurve(mypen, mypoint)
Me.PictureBox1.Refresh()
End Sub Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim strFilter As String = "BMP文件(*.bmp)|*.bmp"
Dim pdlg As SaveFileDialog = New SaveFileDialog
pdlg.Title = "地图另存为"
pdlg.Filter = strFilter
pdlg.OverwritePrompt = True
pdlg.ShowDialog() If Not pdlg.FileName.Equals("") Then
If Not (mBmpBuffer Is Nothing) Then
'mBmpBuffer.Save("c:\a.bmp")
mBmpBuffer.Save(pdlg.FileName)
End If End If
End Sub Private Sub PictureBox1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PictureBox1.Click End Sub Private Sub PictureBox1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles PictureBox1.Paint
If Not (mBmpBuffer Is Nothing) Then
e.Graphics.DrawImage(mBmpBuffer, 0, 0)
End If
End Sub Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
ComboBox1.Items.Clear()
ComboBox1.Items.Add("模型一")
ComboBox1.Items.Add("模型二")
ComboBox1.Items.Add("模型三")
ComboBox1.Text = "模型一"
End Sub
End Class
发表于 @ 2007年10月31日 11:53:00 | 评论( 0 ) | 编辑| 举报| 收藏 旧一篇:SharpMap AjaxMapControl 中 Zoomin/Zoomout 操作时冻结问题 | 新一篇:Windows 窗体控件进行线程安全调用
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项目中要用图形来显示一个阀门的开度，以及控制阀的开度。本来是要用什么公司买的控件中的饼图之类的实现，不过我觉得也是麻烦，就想，还是自己画吧。
首先添加一个TrackBar，名字是“TrackBar1”，一个label，名字是“L_A_SHANG”，一个GroupBox，名字是“GB_RIGHT”,，然后添加拉动滚动条时的处理函数
'上位机控制
Dim m_start As Integer
Dim RcDraw As System.Drawing.Rectangle
Private Sub TrackBar1_Scroll(ByVal sender As Object, ByVal e As System.EventArgs) Handles TrackBar1.Scroll
m_start = (100 - TrackBar1.Value)
Me.L_A_SHANG.Text = Me.TrackBar1.Value.ToString
GB_RIGHT.Invalidate() '重画GB_RIGHT
End Sub
添加GB_RIGHT重画时的处理函数
Private Sub GB_RIGHT_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles GB_RIGHT.Paint
RcDraw.X = TrackBar1.Location.X - 40
RcDraw.Y = 20
RcDraw.Height = 100
RcDraw.Width = 20
e.Graphics.DrawRectangle(New Pen(Color.Blue, 5), RcDraw)
Dim i = TrackBar1.Location.X - 40
For i = TrackBar1.Location.X - 40 To TrackBar1.Location.X - 20
e.Graphics.DrawLine(New Pen(Color.Blue, 5), i, m_start + 20, i, 120)
Next
Me.L_A_SHANG.Text = Me.TrackBar1.Value.ToString + "%"
End Sub
到此以及可以实现拉动条的时候，图像跟着变化，并显示百分比。