VB.NET我要用鼠標(biāo)軌跡畫一個(gè)矩形框 然后選中控件。就像星際和魔獸爭(zhēng)霸里對(duì)部隊(duì)單位的選中一樣~等大神回答

這個(gè)類繼承自Panel，把它加到你的項(xiàng)目里面，先運(yùn)行一下，然后從工具箱里把它拖到窗體上，然后再向里面添加其它控件就可以了，支持Shift加選，Alt減選

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Imports?System.Linq

Imports?System.Collections

Public?Class?MyPanel

Inherits?Panel

'?選擇模式，相交還是包含

Enum?SelectMode

Intersects

Contains

End?Enum

Dim?down?As?New?Point(-1,?-1)

Dim?rect?As?Rectangle

Dim?selected?As?New?List(Of?Control)

Dim?editting?As?IEnumerable(Of?Control)

Dim?mode?As?SelectMode?=?SelectMode.Contains

Dim?shift,?alt?As?Boolean

Public?Sub?New()

Me.DoubleBuffered?=?True

End?Sub

Protected?Overrides?Sub?OnMouseDown(e?As?MouseEventArgs)

MyBase.OnMouseDown(e)

down?=?e.Location

editting?=?selected.ToArray().ToList()

OnMouseMove(e)

End?Sub

Protected?Overrides?Sub?OnMouseMove(e?As?MouseEventArgs)

MyBase.OnMouseMove(e)

If?e.Button?=?Windows.Forms.MouseButtons.Left?Then

Dim?loc?As?New?Point(Math.Min(down.X,?e.X),?Math.Min(down.Y,?e.Y))

Dim?size?As?New?Size(Math.Abs(down.X?-?e.X),?Math.Abs(down.Y?-?e.Y))

rect?=?New?Rectangle(loc,?size)

Dim?cs?As?New?List(Of?Control)

For?Each?c?In?Controls

cs.Add(c)

Next

Dim?a?=?cs.Where(Function(n?As?Control)?(mode?=?SelectMode.Contains?And?rect.Contains(n.Bounds))?Or?(mode?=?SelectMode.Intersects?And?rect.IntersectsWith(n.Bounds)))

If?shift?Then?editting?=?a.Union(selected)?Else?If?alt?Then?editting?=?selected.Except(a)?Else?editting?=?a

Invalidate()

End?If

End?Sub

Protected?Overrides?Sub?OnMouseUp(e?As?MouseEventArgs)

MyBase.OnMouseUp(e)

down?=?New?Point(-1,?-1)

selected?=?editting.ToList()

editting?=?Nothing

Invalidate()

End?Sub

Protected?Overrides?Function?ProcessKeyPreview(ByRef?m?As?Message)?As?Boolean

Dim?KeyCode?As?Keys?=?CInt(m.WParam)?And?CInt(Keys.KeyCode)

Dim?d?As?Boolean

If?m.Msg?=?H100?Or?m.Msg?=?H104?Then?d?=?True?Else?If?m.Msg?=?H101?Or?m.Msg?=?H105?Then?d?=?False?Else?Return?MyBase.ProcessKeyPreview(m)

If?KeyCode?=?Keys.ShiftKey?Then

shift?=?d

ElseIf?KeyCode?=?Keys.Menu?Then

alt?=?d

End?If

Return?MyBase.ProcessKeyPreview(m)

End?Function

Protected?Overrides?Sub?OnPaint(e?As?PaintEventArgs)

MyBase.OnPaint(e)

For?Each?c?As?Control?In?IIf(editting?Is?Nothing,?selected,?editting)

e.Graphics.DrawRectangle(New?Pen(Color.Gray)?With?{.DashStyle?=?Drawing2D.DashStyle.DashDot},?c.Left?-?1,?c.Top?-?1,?c.Width?+?1,?c.Height?+?1)

Next

If?(down.X??0)?Then?e.Graphics.DrawRectangle(New?Pen(Color.Gray)?With?{.DashStyle?=?Drawing2D.DashStyle.DashDot},?rect)

End?Sub

End?Class

Vb.net怎么實(shí)現(xiàn)圖像的處理

這問(wèn)題有點(diǎn)籠統(tǒng)，軟糖來(lái)說(shuō)說(shuō)把：

圖像處理由System.Drawing命名空間負(fù)責(zé)。

主要是Bitmap類和Graphics類。

Bitmap表示一個(gè)位圖，可以是BMP,JPG,PNG等文件。

裝載位圖

Dim?位圖?As?Bitmap?=?Bitmap.FromFile("C:\Image1.PNG")

Graphics表示一張畫紙，能夠進(jìn)行繪制操作。

它可以被窗體、控件、位圖調(diào)用CreateGraphics()方法來(lái)創(chuàng)建。

然后調(diào)用Graphics.Draw開(kāi)頭的一系列函數(shù)來(lái)繪制圖像和圖形，F(xiàn)ill開(kāi)頭的填充圖形。

創(chuàng)建畫紙并繪制位圖

Dim?畫紙?As?Graphics?=?Me.CreateGraphics()

畫紙.DrawImage(位圖,?100,?100,?256,?256)

可以將上面三行放到Form1_Load中測(cè)試，把路徑改一下，

還可以把Me改為能在上面繪圖的控件的名稱。

更多內(nèi)容請(qǐng)看MSDN的System.Drawing命名空間。

如滿意，請(qǐng)采納，謝謝。

用VB.NET繪制GDI圖形

下面的例子通過(guò)重載Form 窗體的OnPaint()方法繪制GDI圖形Protected Overrides Sub onpaint(ByVal e As System Windows Forms PaintEventArgs)注釋 /////////////繪制任意直線Dim g As Graphics = e GraphicsDim mypen As Pen = New Pen(Color Red )g DrawLine(mypen )注釋 /////////////繪制矩形(任意直線構(gòu)成的封閉圖形)Dim point As PointF = New PointF( F F)Dim point As PointF = New PointF( F F)Dim point As PointF = New PointF( F F)Dim point As PointF = New PointF( F F)Dim curvepoints As PointF() = {point point point point }g DrawPolygon(New Pen(Color Blue ) curvepoints)注釋 ////////////文本表示Dim FFamily As FontFamily = New FontFamily( Arial )Dim font As Font = New Font(FFamily 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( )e Graphics DrawString(text font solidbrush pr)注釋 ////////////平面繪制Dim rec As RectangleF = New RectangleF( )g DrawPie(mypen rec )注釋 ///////////封閉圖形 應(yīng)該是個(gè)圓g DrawClosedCurve(mypen curvepoints Drawing Drawing D FillMode Alternate)注釋 ///////////大家自己試試看吧g DrawArc(mypen )g DrawCurve(mypen curvepoints)g DrawBezier(mypen )g DrawBeziers(mypen curvepoints)注釋 //////////這可是一個(gè)圓Dim rec As RectangleF = New RectangleF( )g DrawEllipse(mypen rec )注釋 //////////這是一個(gè)橢圓Dim rec As RectangleF = New RectangleF( )g DrawEllipse(mypen rec )End Sub 這些是我自己試驗(yàn)出來(lái)的 當(dāng)然了 還有好多 我只是開(kāi)了一個(gè)頭 大家要是發(fā)現(xiàn)什么好東東 別忘了通知一下 ） lishixinzhi/Article/program/net/201311/11800

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。

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中,如何點(diǎn)擊按鈕調(diào)出選擇文件窗口選中圖片并在picturebox中顯示出來(lái)?

button , OpenFileDialog , PictureBox , textbox 控件，我把圖片顯示在 picturebox 中，而路

徑存放在 textbox 中，不知道這樣行不行。

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim filename As String

OpenFileDialog1.Filter = "jpg files (*.jpg)|*.jpg"

OpenFileDialog1.FilterIndex = 1

If OpenFileDialog1.ShowDialog() = Windows.Forms.DialogResult.OK Then

filename = OpenFileDialog1.FileName

Else

End

End If

If Not (PictureBox1.Image Is Nothing) Then

PictureBox1.Image.Dispose()

PictureBox1.Image = Nothing

End If

'PictureBox1.Image = System.Drawing.Image.FromFile(filename)

去掉注釋后就顯示圖片

TextBox1.Text = filename

End Sub

picturebox中只記錄文件存放的路徑，我找了一個(gè) ImageLocation 函數(shù)

PictureBox1.ImageLocation = filename 不過(guò)還是會(huì)顯示圖片

VB.net 圖形編程

你好哦樓主~

很高興看到你的問(wèn)題。

但是又很遺憾到現(xiàn)在還沒(méi)有人回答你的問(wèn)題。也可能你現(xiàn)在已經(jīng)在別的地方找到了答案，那就得恭喜你啦。

可能是你問(wèn)的問(wèn)題有些專業(yè)了，沒(méi)人會(huì)?；蛘邉e人沒(méi)有遇到或者接觸過(guò)你的問(wèn)題，所以幫不了你。建議你去問(wèn)題的相關(guān)論壇去求助，那里的人通常比較多，也會(huì)比較熱心，能快點(diǎn)幫你解決問(wèn)題。

希望我的回答能夠幫到你！

祝你好運(yùn)。。

標(biāo)題名稱：vb.net選中圖形 vbs編寫圖形窗口
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