run smooth

[jawadh90]

Graphics guru's, i need your help here. this is a copy of my project and i was wondering how i could make this needle move smooth.

and make needle stop at a certain point when a user clicks on the form. thankx

 

Imports System.Drawing.Drawing2D

Imports System.Math

Public Class Form1

Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

Public Sub New()

MyBase.New()

setstyle(ControlStyles.ResizeRedraw, True)

End Sub

Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)

If disposing Then

If Not (components Is Nothing) Then

components.Dispose()

End If

End If

MyBase.Dispose(disposing)

End Sub

Private components As System.ComponentModel.IContainer

Form Designer

Friend WithEvents PictureBox1 As System.Windows.Forms.PictureBox

Friend WithEvents tmrRotate As System.Windows.Forms.Timer

Friend WithEvents Button1 As System.Windows.Forms.Button

<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

Me.components = New System.ComponentModel.Container()

Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(Form1))

Me.PictureBox1 = New System.Windows.Forms.PictureBox()

Me.tmrRotate = New System.Windows.Forms.Timer(Me.components)

Me.Button1 = New System.Windows.Forms.Button()

Me.SuspendLayout()

Me.PictureBox1.Image = CType(resources.GetObject("PictureBox1.Image"), System.Drawing.Bitmap)

Me.PictureBox1.Location = New System.Drawing.Point(8, 40)

Me.PictureBox1.Name = "PictureBox1"

Me.PictureBox1.Size = New System.Drawing.Size(80, 16)

Me.PictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage

Me.PictureBox1.TabIndex = 0

Me.PictureBox1.TabStop = False

Me.tmrRotate.Interval = 20

Me.Button1.Location = New System.Drawing.Point(8, 8)

Me.Button1.Name = "Button1"

Me.Button1.TabIndex = 1

Me.Button1.Text = "Stop Timer"

Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)

Me.ClientSize = New System.Drawing.Size(592, 573)

Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button1, Me.PictureBox1})

Me.Name = "Form1"

Me.Text = "Form1"

Me.ResumeLayout(False)

End Sub

#End Region

Dim g As Graphics

Dim theta As Single = -1

'Dim angle As Double

Dim sections(4) As Rectangle

Dim bmpNeedle As Bitmap

Private m_SourceBm As Bitmap

Private m_SourceWid As Integer

Private m_SourceHgt As Integer

Private m_SourceCx As Single

Private m_SourceCy As Single

Private m_SourceCorners As PointF()

Private m_DestWid As Integer

Private m_DestHgt As Integer

Private m_DestCx As Single

Private m_DestCy As Single

Private m_DestBm As Bitmap

Private m_DestBackColor As Color

Private Sub tmrRotate_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tmrRotate.Tick

Static angle As Single = 0

Dim AngStep As Single = 5

If theta > 2 * PI Then

theta -= 2 * PI

End If

If theta = angle Then

tmrRotate.Enabled = False

ElseIf angle > theta Then

angle = angle - (AngStep * PI / 180.0)

ElseIf angle < theta Then

angle = angle + (AngStep * PI / 180.0)

End If

Dim corners() As PointF = m_SourceCorners

ReDim Preserve corners(2)

Dim sin_theta As Single = Sin(angle)

Dim cos_theta As Single = Cos(angle)

Dim CorX As Single

Dim CorY As Single

Dim i As Long

For i = 0 To 2

CorX = corners(i).X

CorY = corners(i).Y

corners(i).X = CorX * cos_theta + CorY * sin_theta

corners(i).Y = -CorX * sin_theta + CorY * cos_theta

Next i

For i = 0 To 2

corners(i).X += m_DestCx

corners(i).Y += m_DestCy

Next i

Dim gr_out As Graphics = Graphics.FromImage(m_DestBm)

gr_out.Clear(m_DestBackColor)

gr_out.DrawImage(m_SourceBm, corners)

g = Me.CreateGraphics

Me.Invalidate()

End Sub

Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseDown

Dim a As Double

Dim b As Double

Dim c As Double

Dim myPen As New Pen(Color.Red, 2)

Dim flip As Integer

Dim point1, point2, point3 As Point

point1 = New Point(Me.Width / 2, Me.Height / 2)

point3 = New Point(point1.X + m_SourceBm.Width, point1.Y)

If e.X >= Me.Width / 2 And e.X <= Me.Width And e.Y >= 0 And e.Y <= Me.Height / 2 Then

point2 = New Point(e.X - point1.X, point1.Y - e.Y)

flip = +1

ElseIf e.X >= 0 And e.X <= Me.Width / 2 And e.Y >= 0 And e.Y <= Me.Height / 2 Then

point2 = New Point(e.X - point1.X, point1.Y - e.Y)

flip = +1

ElseIf e.X >= 0 And e.X <= Me.Width / 2 And e.Y >= Me.Height / 2 And e.Y <= Me.Height Then

point2 = New Point(e.X - point1.X, point1.Y - e.Y)

flip = -1

ElseIf e.X >= Me.Width / 2 And e.X <= Me.Width And e.Y >= Me.Height / 2 And e.Y <= Me.Height Then

point2 = New Point(e.X - point1.X, point1.Y - e.Y)

flip = -1

End If

a = Math.Sqrt(Math.Pow(point3.X - point1.X, 2) + Math.Pow(point3.Y - point1.Y, 2))

b = Math.Sqrt(Math.Pow(e.X - point1.X, 2) + Math.Pow(e.Y - point1.Y, 2))

c = Math.Sqrt(Math.Pow(e.X - point3.X, 2) + Math.Pow(e.Y - point3.Y, 2))

theta = Math.Acos((Math.Pow(a, 2) + Math.Pow(b, 2) - Math.Pow(c, 2)) / (2 * a * b))

theta = (theta / Math.PI) * 180

theta += 180

theta = flip * theta

theta = theta * PI / 180.0

'MessageBox.Show(theta.ToString)

tmrRotate.Enabled = True

End Sub

Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint

Dim myPen As New Pen(Color.Red, 2)

e.Graphics.DrawImage(New Bitmap("gauge1.gif"), 0, 0, Me.Width, Me.Height)

e.Graphics.DrawImage(m_DestBm, CInt((Me.Width / 2) - (m_DestBm.Width / 2)), CInt((Me.Height / 2) - (m_DestBm.Height / 2)))

setStyle(ControlStyles.DoubleBuffer, True)

setStyle(ControlStyles.AllPaintingInWmPaint, True)

End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

m_SourceBm = New Bitmap(PictureBox1.Image)

m_SourceWid = m_SourceBm.Width

m_SourceHgt = m_SourceBm.Height

m_SourceCx = m_SourceWid '/ 2

m_SourceCy = m_SourceHgt / 2

m_SourceCorners = New PointF() { _

New PointF(0, 0), _

New PointF(m_SourceWid, 0), _

New PointF(0, m_SourceHgt), _

New PointF(m_SourceWid, m_SourceHgt)}

m_DestWid = Sqrt(m_SourceWid * m_SourceWid + m_SourceHgt * m_SourceHgt)

m_DestHgt = m_DestWid

m_DestCx = m_DestWid

m_DestCy = m_DestHgt

m_DestBm = New Bitmap(m_DestWid * 2, m_DestHgt * 2)

Dim i As Long

For i = 0 To 3

m_SourceCorners(i).X -= m_SourceCx

m_SourceCorners(i).Y -= m_SourceCy

Next i

End Sub

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

tmrRotate.Enabled = False

End Sub

End Class

[starcraft]

I'm not a graph guru but one thing alot of ppl say to do is add this

SetStyle(ControlStyles.DoubleBuffer, True) 'to reduce flicker if there will be any

i dont know if it will help u or not but i thought i'd let u see

[Nerseus]

Can you post your project via a zip file? Don't include the EXE please.

 

The code won't run as you didn't include any of the graphics and some are (apparently) embedded and some are loaded from disk. Having the whole project is essential to debugging in this case.

 

-ner