I have developed coding in vb.net to insert media player and also i am able to add all features to media player like time, seek bar but for my project, it is mandatory to show flexible grid over the playing video which requires advanced level of programming.I learned to add lines grids on a form but forming grids over playing video and transform it size graphically is difficult,i would be glad if you help me...thank you in advance
the following code help in forming grids but it cannot be transformed and also it cannot be placed over media player
Option Strict On
Option Explicit On
Option Infer Off
Public Class Form1
Sub DrawGrid(g As Graphics, origin As Point, rows As Integer, columns As Integer, cellSize As Size)
Dim gridWidth As Integer = columns * cellSize.Width
Dim gridHeight As Integer = rows * cellSize.Height
Dim left As Integer = origin.X - (gridWidth \ 2)
Dim right As Integer = origin.X + (gridWidth \ 2)
Dim top As Integer = origin.Y - (gridHeight \ 2)
Dim bottom As Integer = origin.Y + (gridHeight \ 2)
For y As Integer = top To bottom + 1 Step cellSize.Height
Dim pt1 As New Point(left, y)
Dim pt2 As New Point(right, y)
g.DrawLine(Pens.Black, pt1, pt2)
Next
For x As Integer = left To right + 1 Step cellSize.Width
Dim pt1 As New Point(x, top)
Dim pt2 As New Point(x, bottom)
g.DrawLine(Pens.Black, pt1, pt2)
Next
g.DrawEllipse(Pens.Red, New Rectangle(origin.X - 5, origin.Y - 5, 10, 10))
End Sub
Private Sub Form1_Paint(sender As Object, e As PaintEventArgs) Handles Me.Paint
Dim origin As New Point(Me.ClientRectangle.Width \ 2, Me.ClientRectangle.Height \ 2)
Dim cellSize As New Size(10, 10)
Dim rowCount As Integer = 10
Dim columnCount As Integer = 10
DrawGrid(e.Graphics, origin, rowCount, columnCount, cellSize)
End Sub
End Class
Related
I'm designing a hexagon grid and I need to be able to name each hexagon, so I can refer to them later. Below is my class, it generates the hexagon grid, and I've labeled the code throughout so you can understand what's happening.
I've been searching for a while now reading a lot about Graphics, but I can't get a working design with the answers I've seen offered. Perhaps, I'm going about this wrong by using Graphics, but my plan is to be able to click on each hexagon and do something with it.
Note: If you see a way to improve my code let me know. It's appreciated!
' Generate Hexagon Grid
Private Sub Form1_Paint(sender As Object, e As PaintEventArgs) Handles Me.Paint
' Hexagon Grid Parameters
Dim HexagonRadius As Integer = 20 ' Fix "Position Hexagon Grid Columns" Before Changing Hexagon Radius
Dim GridSize As Integer = 10
' Generate Hexagon Grid
Dim HexagonX As Integer = HexagonRadius
Dim HexagonY As Integer = HexagonRadius
For i As Integer = 1 To GridSize
For j As Integer = 1 To GridSize
' Hexagon Vertex Coordinates
Dim point1 As New Point((HexagonX - HexagonRadius), (HexagonY))
Dim point2 As New Point((HexagonX - (HexagonRadius / 2)), (HexagonY + ((HexagonRadius / 2) * Math.Sqrt(3))))
Dim point3 As New Point((HexagonX + (HexagonRadius / 2)), (HexagonY + ((HexagonRadius / 2) * Math.Sqrt(3))))
Dim point4 As New Point((HexagonX + HexagonRadius), (HexagonY))
Dim point5 As New Point((HexagonX + (HexagonRadius / 2)), (HexagonY - ((HexagonRadius / 2) * Math.Sqrt(3))))
Dim point6 As New Point((HexagonX - (HexagonRadius / 2)), (HexagonY - ((HexagonRadius / 2) * Math.Sqrt(3))))
Dim hexagonPoints As Point() = {point1, point2, point3, point4, point5, point6}
' Create Hexagon
e.Graphics.FillPolygon(Brushes.Green, hexagonPoints)
' Hexagon Outline
e.Graphics.DrawLine(Pens.Black, point1, point2)
e.Graphics.DrawLine(Pens.Black, point2, point3)
e.Graphics.DrawLine(Pens.Black, point3, point4)
e.Graphics.DrawLine(Pens.Black, point4, point5)
e.Graphics.DrawLine(Pens.Black, point5, point6)
e.Graphics.DrawLine(Pens.Black, point6, point1)
' Position Hexagon Grid Columns
HexagonY += 34 ' Specific to Hexagon Radius: 20
Next
If i Mod 2 > 0 Then
HexagonY = 36.75 ' Specific to Hexagon Radius: 20
Else
HexagonY = 20 ' Specific to Hexagon Radius: 20
End If
HexagonX += 30 ' Specific to Hexagon Radius: 20
Next
End Sub
You'll need to create some Hexagon class with it's coordinates and (maybe name, if really needed). And save them to some suitable collection (2-dimensional array maybe?)
This should happen somewhere outside your Paint event and might be recalculated on grid SizeChanged event.
Inside your Paint event you'll just iterate throught existing collection and render according to pre-computed coordinates.
OnClick event will loop throught the same collection to find specific Hexagon for updating (changing background color for example) and forcing form to repaint to take effect.
For large rendering you should consider rendering to bitmap first and drawing that final bitmap to e.Graphics for faster work. Your bitmap could be cached as well to speed up even more.
EDIT: Code sample added
Turn Option Strict On in your project properties to avoid many problems in your code that you're not aware of.
Public Class frmTest
Private Const HexagonRadius As Integer = 20
Private Const GridSize As Integer = 10
Private fHexagons As New List(Of Hexagon)
Private fCache As Bitmap
Private fGraphics As Graphics
Private Sub ResetHexagons() 'Call when some parameter changes (Radius/GridSize)
fHexagons.Clear()
Invalidate()
End Sub
Private Function EnsureHexagons() As List(Of Hexagon)
Dim X, Y As Single, xi, yi As Integer
If fHexagons.Count = 0 Then
X = HexagonRadius : Y = HexagonRadius
For xi = 1 To GridSize
For yi = 1 To GridSize
fHexagons.Add(New Hexagon(HexagonRadius, X, Y))
Y += 34
Next
'Do your math to get theese values from HexagonRadius value
If xi Mod 2 > 0 Then
Y = 36.75
Else
Y = 20
End If
X += 30
Next
fCache?.Dispose()
fGraphics?.Dispose()
fCache = New Bitmap(GridSize * HexagonRadius * 2, GridSize * HexagonRadius * 2)
fGraphics = Graphics.FromImage(fCache)
For Each H As Hexagon In fHexagons
H.Render(fGraphics)
Next
End If
Return fHexagons
End Function
Private Sub frmTest_Paint(sender As Object, e As PaintEventArgs) Handles Me.Paint
EnsureHexagons()
e.Graphics.DrawImageUnscaled(fCache, Point.Empty)
End Sub
Private Sub frmTest_MouseClick(sender As Object, e As MouseEventArgs) Handles Me.MouseClick
Dim H As Hexagon = EnsureHexagons.FirstOrDefault(Function(X) X.Contains(e.Location))
If H IsNot Nothing Then
H.Checked = Not H.Checked
H.Render(fGraphics) 'Update cache without repainting all
Invalidate()
End If
End Sub
End Class
Public Class Hexagon
Public ReadOnly Radius, X, Y As Single
Public ReadOnly Points() As PointF
Public Property Checked As Boolean
Public Sub New(Radius As Single, X As Single, Y As Single)
Me.Radius = Radius : Me.X = X : Me.Y = Y
Points = {New PointF((X - Radius), (Y)),
New PointF((X - (Radius / 2)), CSng(Y + ((Radius / 2) * Math.Sqrt(3)))),
New PointF((X + (Radius / 2)), CSng(Y + ((Radius / 2) * Math.Sqrt(3)))),
New PointF((X + Radius), (Y)),
New PointF((X + (Radius / 2)), CSng(Y - ((Radius / 2) * Math.Sqrt(3)))),
New PointF((X - (Radius / 2)), CSng(Y - ((Radius / 2) * Math.Sqrt(3.0!))))}
End Sub
Public Sub Render(G As Graphics)
' Create Hexagon
G.FillPolygon(If(Checked, Brushes.Blue, Brushes.Green), Points)
' Hexagon Outline
For i As Integer = 0 To Points.Length - 1
G.DrawLine(Pens.Black, Points(i), Points((i + 1) Mod Points.Length))
Next
End Sub
Public Function Contains(P As Point) As Boolean
'Do your math here, this is just simplified estimation
Return X - Radius <= P.X AndAlso P.X <= X + Radius AndAlso Y - Radius <= P.Y AndAlso P.Y <= Y + Radius
End Function
End Class
Afternoon, I have a maths-formula type query in VB.NET
I have a screen, it can be resized and the only input I get from the user, is the quantity of "balls" that go inside the screen.
I know I need to square root the width and height, to get my "quantity" of balls for a best-as equal rows and columns - but Im a bit stuffed on calculating:
The size of the balls.
The distance between the balls (if need-be, the balls need to be smaller)
and as per not-my example below, I need the ball start position to be at the top left corner of the form.
So, open up a copy of VS, add a new winforms project, paste the code below into the Paint event of the form and run it.
So what I need is: A indeterminate amount of balls to generate (fed by a user) to fill up the form, as equally best on the X and Y axis to fill up the form staying the same size and if possible, a little distance between them, say, a quarter of the size of the ball itself.
Feel free to resize the screen or change the _BallsInTotal variable for it to auto-generate the amount of balls.
Dim _BallsInTotal As Integer
_BallsInTotal = 100
Dim TotalColumns As Integer
Dim TotalRows As Integer
TotalColumns = Math.Sqrt(_BallsInTotal)
TotalRows = Math.Sqrt(_BallsInTotal)
Dim BallWidth As Single = 20
Dim BallHeight As Single = 20
Dim BallPositionX As Long = BallWidth * 2
Dim BallPositionY As Long = BallHeight * 2
Dim solidBrush As New SolidBrush(Color.FromArgb(255, 255, 0, 0))
Dim rows As Single
Dim columns As Single
For columns = 1 To TotalColumns
For rows = 1 To TotalRows
e.Graphics.FillEllipse(solidBrush, BallPositionX * columns, BallPositionY * rows, BallWidth , BallHeight )
Next
Next
Ive been scratching my head for the last two hour where Im at the point where its going to bleed! (seriously, its doing my head in).
What I've added is an InputBox that allows the user to specify the total number of balls. I placed the code in the OnPaint event for drawing the graphics. I've calculated the width of the columns and rows based on the form width/height. I'm using variables for the column/row in the For loops to track which column and row I'm drawing in, then using the column/row width/height to find my x and y (plus an additional .1 of the column/row width/height for spacing). And finally using .8 of the column/row width/height for how much space I want the ball to take up in the column/row.
Public Class Form1
Dim _total As Int32 = 120
Private Sub Form1_Paint(sender As Object, e As PaintEventArgs) Handles Me.Paint
Dim columns As Int32 = Math.Ceiling(Math.Sqrt(_total))
Dim rows As Int32 = Math.Ceiling(Math.Sqrt(_total))
Dim width As Int32 = Me.ClientSize.Width
Dim height As Int32 = Me.ClientSize.Height
Dim columnWidth As Int32 = width / columns
Dim rowHeight As Int32 = height / rows
Dim brush As Brush = New SolidBrush(Color.FromArgb(255, 255, 0, 0))
Me.SuspendLayout()
Dim painted As Int32 = 0
For r As Int32 = 0 To rows - 1
For c As Int32 = 0 To columns - 1
Dim x As Int32 = (c * columnWidth) + (columnWidth * 0.1)
Dim y As Int32 = (r * rowHeight) + (rowHeight * 0.1)
e.Graphics.FillEllipse(brush, New Rectangle(x, y, columnWidth * 0.8, rowHeight * 0.8))
painted += 1
If painted = _total Then
Me.ResumeLayout()
Exit Sub
End If
Next
Next
End Sub
Private Sub Form1_SizeChanged(sender As Object, e As EventArgs) Handles Me.SizeChanged
Me.Invalidate()
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim input As String = InputBox("Enter a total.")
Dim number As Int32 = 0
If Int32.TryParse(input, number) Then
_total = number
Me.Invalidate()
End If
End Sub
End Class
I'm using Logo right now and i'm making a project and basically i want to turn your recorded voice into something visual, only problem is when i go to find code it re that works it requires 1: A picture box and 2: to manually grab the sound .wav file and place it. I already made code to record my voice and to make it into a .Wav file and i already have code to visualize it, just when i run it it appears as a thick square of lines rather than the example i shown. Note: I'm not drawing into a picturebox, i'm drawing directly into the Form by using g.drawline(bleh,bleh,bleh,bleh).
(Example: http://static1.1.sqspcdn.com/static/f/335152/16812948/1330286658510/76_dsc3616.jpeg?token=R1zPNnr9PAoB3WvnDxfFFFvzkMw%3D )
The code im trying to run:
Public Sub DrawSound(x As Integer, y As Integer)
Dim samplez As New List(Of Short)
Dim maxamount As Short
Dim pic As New Bitmap(x, y)
Dim ratio As Integer = (samplez.Count - 1) / (y - 1) 'If there are 10000 samples and 200 pixels, this would be every 50th sample is shown
Dim halfpic As Integer = (x / 2) 'Simply half the height of the picturebox
GC.Collect()
Dim wavefile() As Byte = IO.File.ReadAllBytes("C:\Users\" & Environ$("Username") & "\Documents\Sounds\Mic.wav")
GC.Collect()
Dim memstream As New IO.MemoryStream(wavefile)
Dim binreader As New IO.BinaryReader(memstream)
Dim ChunkID As Integer = binreader.ReadInt32()
Dim filesize As Integer = binreader.ReadInt32()
Dim rifftype As Integer = binreader.ReadInt32()
Dim fmtID As Integer = binreader.ReadInt32()
Dim fmtsize As Integer = binreader.ReadInt32()
Dim fmtcode As Integer = binreader.ReadInt16()
Dim channels As Integer = binreader.ReadInt16()
Dim samplerate As Integer = binreader.ReadInt32()
Dim fmtAvgBPS As Integer = binreader.ReadInt32()
Dim fmtblockalign As Integer = binreader.ReadInt16()
Dim bitdepth As Integer = binreader.ReadInt16()
If fmtsize = 18 Then
Dim fmtextrasize As Integer = binreader.ReadInt16()
binreader.ReadBytes(fmtextrasize)
End If
Dim DataID As Integer = binreader.ReadInt32()
Dim DataSize As Integer = binreader.ReadInt32()
samplez.Clear()
For i = 0 To (DataSize - 3) / 2
samplez.Add(binreader.ReadInt16())
If samplez(samplez.Count - 1) > maxamount Then 'Using this for the pic
maxamount = samplez(samplez.Count - 1)
End If
Next
For i = 1 To x - 10 Step 2 'Steping 2 because in one go, we do 2 samples
Dim leftdata As Integer = Math.Abs(samplez(i * ratio)) 'Grabbing that N-th sample to display. Using Absolute to show them one direction
Dim leftpercent As Single = leftdata / (maxamount * 2) 'This breaks it down to something like 0.0 to 1.0. Multiplying by 2 to make it half.
Dim leftpicheight As Integer = leftpercent * x 'So when the percent is tied to the height, its only a percent of the height
g.DrawLine(Pens.LimeGreen, i, halfpic, i, leftpicheight + halfpic) 'Draw dat! The half pic puts it in the center
Dim rightdata As Integer = Math.Abs(samplez((i + 1) * ratio)) 'Same thing except we're grabbing i + 1 because we'd skip it because of the 'step 2' on the for statement
Dim rightpercent As Single = -rightdata / (maxamount * 2) 'put a negative infront of data so it goes down.
Dim rightpicheight As Integer = rightpercent * x
g.DrawLine(Pens.Blue, i, halfpic, i, rightpicheight + halfpic)
Next
End Sub
X and Y is the middle of the form. And i also would link where i got the code but i forgot where and also, i modified it in attempt to run it directly into he form rather than a picturebox. It worked sorta haha (And there is so many unused dims but all i know is, once i remove one none of the code works haha) So could anyone help?
I am making a lunar lander game, and want the spaceship to rotate when the left and right arrow keys are pressed.
I know how to move an image using a picture box and the keydown event, but there isn't anyway to directly rotate a picture box. Do i need to use the image a different way to be able to achieve what I want? Any help is much appreciated.
Make a new class inheriting from picturebox. Use that. You can edit the designer.vb to change the type.
This is pseudocode, untested, so it certainly won't run.
class RotateablePictureBox
inherits picturebox
public property RotationAngle as single
overrides onpaint(e as ...)
e.graphics.rotatetransform(rotationangle)
mybase.onpaint(e)
That's the idea that Hans Passant is talking about (might have to do the DrawImage yourself too and skip the mybase.onpaint - it's done like e.graphics.onpaint(TheImage,dimensions etc...))
This is my first time posting code so let me know how I can improve it for the group. I developed this class using code from http://www.devasp.net/net/articles/display/391.htmlenter code here
I hope this helps. This is the button code
Private Sub btnRotateLeft_Click(sender As Object, e As EventArgs) Handles btnRotateLeft.Click
' IMAGE IS THE NEW OBJECT FROM THE CLASS. PASS THE PICTUREBOX CONTROL(pbItems)
image.RotateLeft(pbItems)
End Sub
This is the class
Imports System.Math
Public Class clsImage
Private wid As Single
Private hgt As Single
Public Function RotateLeft(ByVal picSource As PictureBox) As PictureBox
'ROTATES THE IMAGE LEFT
Dim bm_in = New Bitmap(picSource.Image)
wid = bm_in.Width
hgt = bm_in.Height
Dim corners As Point() = {New Point(0, 0), New Point(wid, 0), New Point(0, hgt), New Point(wid, hgt)}
Dim cx As Single = wid / 2
Dim cy As Single = hgt / 2
Dim i As Long
'ROTATES LEFT
For i = 0 To 3
corners(i).X -= cx
corners(i).Y -= cy
Next i
'THE ROTATION ANGLE IS HARD CODED HERE BUT COULD BE PASS TO THE CLASS
Dim theta As Single = Single.Parse(90) * PI / 180.0
Dim sin_theta As Single = Sin(theta)
Dim cos_theta As Single = Cos(theta)
Dim X As Single
Dim Y As Single
For i = 0 To 3
X = corners(i).X
Y = corners(i).Y
corners(i).X = X * cos_theta + Y * sin_theta
corners(i).Y = -X * sin_theta + Y * cos_theta
Next i
Dim xmin As Single = corners(0).X
Dim ymin As Single = corners(0).Y
For i = 1 To 3
If xmin > corners(i).X Then xmin = corners(i).X
If ymin > corners(i).Y Then ymin = corners(i).Y
Next i
For i = 0 To 3
corners(i).X -= xmin
corners(i).Y -= ymin
Next i
Dim bm_out As New Bitmap(CInt(-2 * xmin), CInt(-2 * ymin))
Dim gr_out As Graphics = Graphics.FromImage(bm_out)
ReDim Preserve corners(2)
gr_out.DrawImage(bm_in, corners)
picSource.Image = bm_out
Return picSource
End Function
Public Function RotateRight(ByVal picSource As PictureBox) As PictureBox
'ROTATES THE IMAGE RIGHT
Dim bm_in = New Bitmap(picSource.Image)
wid = bm_in.Width
hgt = bm_in.Height
Dim corners As Point() = {New Point(0, 0), New Point(wid, 0), New Point(0, hgt), New Point(wid, hgt)}
Dim cx As Single = wid / 2
Dim cy As Single = hgt / 2
Dim i As Long
'ROTATES RIGHT
For i = 0 To 3
corners(i).X -= cx
corners(i).Y -= cy
Next i
'THE ROTATION ANGLE IS HARD CODED HERE BUT COULD BE PASS TO THE CLASS
Dim theta As Single = Single.Parse(-90) * PI / 180.0
Dim sin_theta As Single = Sin(theta)
Dim cos_theta As Single = Cos(theta)
Dim X As Single
Dim Y As Single
For i = 0 To 3
X = corners(i).X
Y = corners(i).Y
corners(i).X = X * cos_theta + Y * sin_theta
corners(i).Y = -X * sin_theta + Y * cos_theta
Next i
Dim xmin As Single = corners(0).X
Dim ymin As Single = corners(0).Y
For i = 1 To 3
If xmin > corners(i).X Then xmin = corners(i).X
If ymin > corners(i).Y Then ymin = corners(i).Y
Next i
For i = 0 To 3
corners(i).X -= xmin
corners(i).Y -= ymin
Next i
Dim bm_out As New Bitmap(CInt(-2 * xmin), CInt(-2 * ymin))
Dim gr_out As Graphics = Graphics.FromImage(bm_out)
ReDim Preserve corners(2)
gr_out.DrawImage(bm_in, corners)
picSource.Image = bm_out
Return picSource
End Function
End Class
I have to generate the following figure according to user fed values. How do I go about drawing the arcs (B-C-F as in figure, circular in nature) given their start point & end point (B & F respectively) & the height from the segment BF? I can do some geometric calculations & get the radius & all, but how do I draw the arc?
I have tried using the Graphics.DrawCurve() method, but it doesn't work as expected. How can I make this method work for circular arcs? Any other workaround is also welcome.
From my comment:
If you have computed the necessary radius to generate the curve, then
simply draw the entire circle with Graphics.DrawEllipse(), but use
Graphics.SetClip() and pass a rectangle using the points B and F as a
side and computing the other two points using the height C. This will
clip the entire circle to just the part visible within that rectangle.
Then call Graphics.ResetClip() and draw the rest of the lines. Repeat
the SetClip() trick to draw the curve at the bottom as well.
Here's a proof of concept for the top curve thru B, C, and F.
I used the formulas provided by Donna Roberts at Investigative Circle Activity Using Three Points.
Here's a screenshot:
...and the code that produced it:
Public Class Form1
Private B As New Point(50, 100)
Private F As New Point(250, 100)
Private DistanceFromBF As Integer = 50
Private Sub Form1_Paint(sender As System.Object, e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
If B.Y = F.Y Then
Dim C As New Point(B.X + (F.X - B.X) / 2, B.Y - DistanceFromBF)
Dim ctr As Point
Dim rad As Double
CircleFromPointsOnCircumference(B, C, F, ctr, rad)
Dim rc As New Rectangle(ctr, New Size(1, 1))
rc.Inflate(rad, rad)
e.Graphics.DrawRectangle(Pens.Black, rc)
Dim clip As New Rectangle(New Point(B.X, B.Y - DistanceFromBF), New Size(F.X - B.X, DistanceFromBF))
e.Graphics.SetClip(clip)
e.Graphics.DrawEllipse(Pens.Green, rc)
e.Graphics.ResetClip()
DrawPoint(B, e.Graphics, Color.Red)
DrawPoint(C, e.Graphics, Color.Red)
DrawPoint(F, e.Graphics, Color.Red)
DrawPoint(ctr, e.Graphics, Color.Green)
End If
End Sub
Private Sub DrawPoint(ByVal pt As Point, ByVal G As Graphics, ByVal clr As Color)
Dim rc As New Rectangle(pt, New Size(1, 1))
rc.Inflate(3, 3)
Using brsh As New SolidBrush(clr)
G.FillEllipse(brsh, rc)
End Using
End Sub
Private Sub CircleFromPointsOnCircumference(ByVal ptA As Point, ByVal ptB As Point, ByVal ptC As Point, ByRef Center As Point, ByRef Radius As Double)
Dim mR As Double = CDbl(ptA.Y - ptB.Y) / CDbl(ptA.X - ptB.X)
Dim mT As Double = CDbl(ptC.Y - ptB.Y) / CDbl(ptC.X - ptB.X)
Dim X As Double = (mR * mT * (ptC.Y - ptA.Y) + mR * (ptB.X + ptC.X) - mT * (ptA.X + ptB.X)) / CDbl(2) * (mR - mT)
Dim Y As Double = CDbl(-1) / mR * (X - CDbl(ptA.X + ptB.X) / CDbl(2)) + (CDbl(ptA.Y + ptB.Y) / CDbl(2))
Center = New Point(X, Y)
Radius = Math.Sqrt(Math.Pow(ptA.X - Center.X, 2) + Math.Pow(ptA.Y - Center.Y, 2))
End Sub
End Class
Got it! Thanks #Mitch & #Idle_Mind
Using the builtin DrawArc method of Graphics
Friend Function draw_tank() As Boolean
' Create pen.
Dim blackPen As New Pen(Color.Black, 3)
' Create rectangle to bound ellipse.
Dim rect As New Rectangle(100, 100, 200, 200)
' Keeping the width & length same (200) we get a circle
' Create start and sweep angles on ellipse.
Dim startAngle As Single = 225.0F
Dim sweepAngle As Single = 90.0F
' Draw arc to screen.
Dim myarc As Graphics = Me.CreateGraphics
myarc.DrawArc(blackPen, rect, startAngle, sweepAngle)
Return True
End Function
Suggestions/Improvements welcome.
Note - This isn't the actual function from my code.