VB.Net Tutorial/2D Graphics/Coordinate

Draw Coordinate

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

Draw line using float coordinates

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

Draw line using integer coordinates

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

GDI+ Coordinate System

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