VB.Net Tutorial/2D Graphics/Coordinate
Содержание
Draw Coordinate
<source lang="vbnet">Imports System Imports System.Drawing Imports System.Collections Imports System.ruponentModel Imports System.Windows.Forms Imports System.Data Imports System.Drawing.Drawing2D public class DrawCoordinate
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class Public Class Form1
Inherits System.Windows.Forms.Form
Private startPoint As New Point(50, 217)
Private endPoint As New Point(50, 217)
Public Sub New()
MyBase.New()
InitializeComponent()
End Sub
Private components As System.ruponentModel.IContainer
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents CheckBox1 As System.Windows.Forms.CheckBox
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.Button1 = New System.Windows.Forms.Button
Me.CheckBox1 = New System.Windows.Forms.CheckBox
Me.SuspendLayout()
"
"Button1
"
Me.Button1.BackColor = System.Drawing.SystemColors.Desktop
Me.Button1.Location = New System.Drawing.Point(352, 16)
Me.Button1.Name = "Button1"
Me.Button1.Size = New System.Drawing.Size(96, 24)
Me.Button1.TabIndex = 0
Me.Button1.Text = "Clear All"
"
"CheckBox1
"
Me.CheckBox1.Location = New System.Drawing.Point(352, 56)
Me.CheckBox1.Name = "CheckBox1"
Me.CheckBox1.TabIndex = 1
Me.CheckBox1.Text = "Rectangle"
"
"Form1
"
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.BackColor = System.Drawing.SystemColors.ActiveCaptionText
Me.ClientSize = New System.Drawing.Size(480, 317)
Me.Controls.Add(Me.CheckBox1)
Me.Controls.Add(Me.Button1)
Me.Text = ""
Me.ResumeLayout(False)
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
startPoint.X = 50
startPoint.Y = 217
endPoint.X = 50
endPoint.Y = 217
Me.Invalidate(Me.ClientRectangle)
End Sub
Protected Overrides Sub OnMouseDown(ByVal e As MouseEventArgs)
If e.Button = MouseButtons.Left Then
Dim g1 As Graphics = Me.CreateGraphics()
Dim linePen As New Pen(Color.Green, 1)
Dim ellipsePen As New Pen(Color.Red, 1)
startPoint = endPoint
endPoint = New Point(e.X, e.Y)
g1.DrawLine(linePen, startPoint, endPoint)
If checkBox1.Checked Then
g1.DrawRectangle(ellipsePen, e.X - 2, e.Y - 2, 4, 4)
Else
g1.DrawEllipse(ellipsePen, e.X - 2, e.Y - 2, 4, 4)
End If
linePen.Dispose()
ellipsePen.Dispose()
g1.Dispose()
End If
End Sub
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
Dim g As Graphics = e.Graphics
Dim vertFont As New Font("Verdana", 10, FontStyle.Bold)
Dim horzFont As New Font("Verdana", 10, FontStyle.Bold)
Dim vertBrush As New SolidBrush(Color.Black)
Dim horzBrush As New SolidBrush(Color.Blue)
Dim blackPen As New Pen(Color.Black, 2)
Dim bluePen As New Pen(Color.Blue, 2)
" Drawing a vertical and a horizontal line
g.DrawLine(blackPen, 50, 220, 50, 25)
g.DrawLine(bluePen, 50, 220, 250, 220)
"X axis drawing
g.DrawString("0", horzFont, horzBrush, 30, 220)
g.DrawString("1", horzFont, horzBrush, 50, 220)
g.DrawString("2", horzFont, horzBrush, 70, 220)
g.DrawString("3", horzFont, horzBrush, 90, 220)
g.DrawString("4", horzFont, horzBrush, 110, 220)
g.DrawString("5", horzFont, horzBrush, 130, 220)
g.DrawString("6", horzFont, horzBrush, 150, 220)
g.DrawString("7", horzFont, horzBrush, 170, 220)
g.DrawString("8", horzFont, horzBrush, 190, 220)
g.DrawString("9", horzFont, horzBrush, 210, 220)
g.DrawString("10", horzFont, horzBrush, 230, 220)
" Drawing vertical strings
Dim vertStrFormat As New StringFormat
vertStrFormat.FormatFlags = StringFormatFlags.DirectionVertical
g.DrawString("-", horzFont, horzBrush, 50, 212, vertStrFormat)
g.DrawString("-", horzFont, horzBrush, 70, 212, vertStrFormat)
g.DrawString("-", horzFont, horzBrush, 90, 212, vertStrFormat)
g.DrawString("-", horzFont, horzBrush, 110, 212, vertStrFormat)
g.DrawString("-", horzFont, horzBrush, 130, 212, vertStrFormat)
g.DrawString("-", horzFont, horzBrush, 150, 212, vertStrFormat)
g.DrawString("-", horzFont, horzBrush, 170, 212, vertStrFormat)
g.DrawString("-", horzFont, horzBrush, 190, 212, vertStrFormat)
g.DrawString("-", horzFont, horzBrush, 210, 212, vertStrFormat)
g.DrawString("-", horzFont, horzBrush, 230, 212, vertStrFormat)
"Y axis drawing
g.DrawString("100-", vertFont, vertBrush, 20, 20)
g.DrawString("90 -", vertFont, vertBrush, 25, 40)
g.DrawString("80 -", vertFont, vertBrush, 25, 60)
g.DrawString("70 -", vertFont, vertBrush, 25, 80)
g.DrawString("60 -", vertFont, vertBrush, 25, 100)
g.DrawString("50 -", vertFont, vertBrush, 25, 120)
g.DrawString("40 -", vertFont, vertBrush, 25, 140)
g.DrawString("30 -", vertFont, vertBrush, 25, 160)
g.DrawString("20 -", vertFont, vertBrush, 25, 180)
g.DrawString("10 -", vertFont, vertBrush, 25, 200)
" Dispose
vertFont.Dispose()
horzFont.Dispose()
vertBrush.Dispose()
horzBrush.Dispose()
blackPen.Dispose()
bluePen.Dispose()
End Sub
End Class</source>
Draw line using float coordinates
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class DrawLineUsingFloatCoordinates
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class public class Form1
Inherits System.Windows.Forms.Form
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
Dim blackPen As New Pen(Color.Black, 4)
"
Dim x1 As Single = 20.0F
Dim y1 As Single = 20.0F
Dim x2 As Single = 200.0F
Dim y2 As Single = 20.0F
e.Graphics.DrawLine(blackPen, x1, y1, x2, y2)
End Sub
Public Sub New()
MyBase.New()
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 273)
Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
End Sub
End Class</source>
Draw line using integer coordinates
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class DrawLineUsingIntegerCoordinates
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class public class Form1
Inherits System.Windows.Forms.Form
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
Dim blackPen As New Pen(Color.Black, 4)
"
Dim X3 As Integer = 60
Dim Y3 As Integer = 40
Dim X4 As Integer = 250
Dim Y4 As Integer = 100
e.Graphics.DrawLine(blackPen, X3, Y3, X4, Y4)
End Sub
Public Sub New()
MyBase.New()
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 273)
Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
End Sub
End Class</source>
GDI+ Coordinate System
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class GDICoordinateSystem
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class public class Form1
Inherits System.Windows.Forms.Form
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
Dim g As Graphics = e.Graphics
g.TranslateTransform(50, 40)
Dim vertFont As New Font("Verdana", 10, FontStyle.Regular)
Dim horzFont As New Font("Verdana", 10, FontStyle.Regular)
Dim blackBrush As New SolidBrush(Color.Black)
Dim blackPen As New Pen(Color.Black, 1)
Dim bluePen As New Pen(Color.Blue, 1)
" Page Coordinate *****
"X axis drawing
g.DrawString("200", horzFont, blackBrush, 200, 5)
g.DrawString("100", horzFont, blackBrush, 100, 5)
g.DrawString("X", horzFont, blackBrush, 250, 0)
" Drawing vertical strings
Dim vertStrFormat As New StringFormat
vertStrFormat.FormatFlags = StringFormatFlags.DirectionVertical
"Y axis drawing
g.DrawString("100", vertFont, blackBrush, 0, 100)
g.DrawString("200", vertFont, blackBrush, 0, 200)
g.DrawString("Y", vertFont, blackBrush, 0, 250)
" Drawing a vertical and a horizontal line
g.DrawLine(blackPen, 0, 0, 0, 250)
g.DrawLine(blackPen, 0, 0, 250, 0)
Dim A As New Point(0, 0)
Dim B As New Point(120, 80)
g.DrawLine(Pens.Black, A, B)
End Sub
Public Sub New()
MyBase.New()
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 273)
Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
End Sub
End Class</source>
