Hi there. I have written a small procedure to draw various shapes on
things. A bit of it is shown below.
Private Sub drawShape(ByVal shapeType As Integer, ByRef g As Graphics)
Select Case shapeType
Case 1 : g.DrawRectangle(New Pen(Color.Black), 0, 0, 50, 10)
Case 2 'draw a circle
Case 3 'draw a triangle
Case 4 'draw other shape
Case 5 'draw other shape
Case 6 'draw other shape
Case Else 'etc. draw other shapes
End Select
End Sub
If on Form1, I override the OnPaint method with
Protected Overrides Sub OnPaint(ByVal e As
System.Windows.Forms.PaintEventArgs)
MyBase.OnPaint(e)
drawShape(1, e.Graphics)
End Sub
it paints my rectangle as I would expect drawing it on Form1 at 0,0
with width 50 and height 10.
I have lots of other controls on the form, such as buttons, labels,
groupboxes etc. My question is how do I get 'g' (a valid Graphics
instance) for the buttons, labels, groupboxes and other things.
The obvious thing I tried below doesn't work (I see no rectangle on
the GroupBox, called GroupBox1) but still see the rectangle on the
form. I want to see both.
Protected Overrides Sub OnPaint(ByVal e As
System.Windows.Forms.PaintEventArgs)
MyBase.OnPaint(e)
drawShape(1, e.Graphics)
drawShape(1, Me.GroupBox1.Creategraphics())
End Sub
Thank you in advance for all your help and sorry to post more of these
verbose and tricky questions.
Colin 3 10295
Colin - you have come a long way judging by the type of questions you are
now asking.
I'm not going to answer your question directly but provide you with some
information that should enable you to work out the answer to your question
yourself.
If Panel1 is a Panel on your form, TabControl1 is a TabControl on your form,
and Button1 is a Button on your form, when OnPaint is executed
Protected Overrides Sub OnPaint(ByVal e As
System.Windows.Forms.PaintEventArgs)
MyBase.OnPaint(e)
Dim g As Graphics = Panel1.CreateGraphics()
drawShape(1, g)
g.Dispose()
g=TabControl1.CreateGraphics()
drawShape(1,g)
g.Dispose()
g=Button1.Creategraphics()
drawShape(1,g)
g.Dispose()
End Sub
you will see your blue rectangle on both Panel1 and TabControl1, but not
Button1. Ask yourself why the rectangle draws on some form objects but not
others - what is different about them and how would/could you change the
observed behaviour.
Regards
Hexathioorthooxalate
PS: Here's an excerpt from the on-line (VB.NET 2003) docs for
CreateGraphics. Quote: "The returned Graphics object must be disposed
through a call to its Dispose method when it is no longer needed.". Your use
of drawShape(1, Me.GroupBox1.Creategraphics()) doesn't and can't dispose of
the graphics object as written.
"Colin McGuire" <co***********@lycos.co.uk> wrote in message
news:ab**************************@posting.google.c om... Hi there. I have written a small procedure to draw various shapes on things. A bit of it is shown below.
Private Sub drawShape(ByVal shapeType As Integer, ByRef g As Graphics) Select Case shapeType Case 1 : g.DrawRectangle(New Pen(Color.Black), 0, 0, 50, 10) Case 2 'draw a circle Case 3 'draw a triangle Case 4 'draw other shape Case 5 'draw other shape Case 6 'draw other shape Case Else 'etc. draw other shapes End Select End Sub
If on Form1, I override the OnPaint method with
Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs) MyBase.OnPaint(e) drawShape(1, e.Graphics) End Sub
it paints my rectangle as I would expect drawing it on Form1 at 0,0 with width 50 and height 10.
I have lots of other controls on the form, such as buttons, labels, groupboxes etc. My question is how do I get 'g' (a valid Graphics instance) for the buttons, labels, groupboxes and other things.
The obvious thing I tried below doesn't work (I see no rectangle on the GroupBox, called GroupBox1) but still see the rectangle on the form. I want to see both.
Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs) MyBase.OnPaint(e) drawShape(1, e.Graphics) drawShape(1, Me.GroupBox1.Creategraphics()) End Sub
Thank you in advance for all your help and sorry to post more of these verbose and tricky questions. Colin
Hex - thanks for your help.
The Panel etc are .Net controls, and the Button is a Windows control?
But I still want to draw on the Button too. How?
Thank you
Colin.
Hex isnt online today. Could someone else help me out here please.
I can see that rectangles are only drawn on objects that are not
Windows controls (such as buttons and textboxes).
How can I tell as a general rule whether the object is drawn by the
framework and not by Windows? Currently a "GroupBox" is drawn by the
framework but what if Microsoft modify Windows so that it is drawn
there - then my code won't work. So what I think I want it a
subroutine to pass a object (like a button, or a panel, or a
groupbox), and the subroutine print out whether the object is drawn by
Windows or the framework (and therefore whether my blue rectangle,
code below, will be drawn).
Thank you
Colin
"Hexathioorthooxalate" <ru***@spameremove.clara.co.uk> wrote in message news:<10****************@damia.uk.clara.net>... Colin - you have come a long way judging by the type of questions you are now asking.
I'm not going to answer your question directly but provide you with some information that should enable you to work out the answer to your question yourself.
If Panel1 is a Panel on your form, TabControl1 is a TabControl on your form, and Button1 is a Button on your form, when OnPaint is executed
Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs) MyBase.OnPaint(e) Dim g As Graphics = Panel1.CreateGraphics() drawShape(1, g) g.Dispose() g=TabControl1.CreateGraphics() drawShape(1,g) g.Dispose() g=Button1.Creategraphics() drawShape(1,g) g.Dispose() End Sub
you will see your blue rectangle on both Panel1 and TabControl1, but not Button1. Ask yourself why the rectangle draws on some form objects but not others - what is different about them and how would/could you change the observed behaviour.
Regards Hexathioorthooxalate
PS: Here's an excerpt from the on-line (VB.NET 2003) docs for CreateGraphics. Quote: "The returned Graphics object must be disposed through a call to its Dispose method when it is no longer needed.". Your use of drawShape(1, Me.GroupBox1.Creategraphics()) doesn't and can't dispose of the graphics object as written.
"Colin McGuire" <co***********@lycos.co.uk> wrote in message news:ab**************************@posting.google.c om... Hi there. I have written a small procedure to draw various shapes on things. A bit of it is shown below.
Private Sub drawShape(ByVal shapeType As Integer, ByRef g As Graphics) Select Case shapeType Case 1 : g.DrawRectangle(New Pen(Color.Black), 0, 0, 50, 10) Case 2 'draw a circle Case 3 'draw a triangle Case 4 'draw other shape Case 5 'draw other shape Case 6 'draw other shape Case Else 'etc. draw other shapes End Select End Sub
If on Form1, I override the OnPaint method with
Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs) MyBase.OnPaint(e) drawShape(1, e.Graphics) End Sub
it paints my rectangle as I would expect drawing it on Form1 at 0,0 with width 50 and height 10.
I have lots of other controls on the form, such as buttons, labels, groupboxes etc. My question is how do I get 'g' (a valid Graphics instance) for the buttons, labels, groupboxes and other things.
The obvious thing I tried below doesn't work (I see no rectangle on the GroupBox, called GroupBox1) but still see the rectangle on the form. I want to see both.
Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs) MyBase.OnPaint(e) drawShape(1, e.Graphics) drawShape(1, Me.GroupBox1.Creategraphics()) End Sub
Thank you in advance for all your help and sorry to post more of these verbose and tricky questions. Colin This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
by: Joe Kelsey |
last post by:
When you use addEventListener (or addEvent in IE) to call an object
method, does it call it with the correct this parameter?
The ECMAScript reference has a lot to say about the caller using...
|
by: William Apple |
last post by:
Despite the fact this deals with webservices I believe it is a VB question.
I am working on a test application that passes data to a webservice.
The webservices takes a variable type that is...
|
by: Ram |
last post by:
Hi All,
I am using Object Data Source to bind data in the gridview. I have
set the property AllowSorting=true. While running the application, I
could sort the data only in ascending order. Is...
|
by: burningodzilla |
last post by:
Hi all - I'm preparing to dive in to more complex application
development using javascript, and among other things, I'm having a hard
time wrapping my head around an issues regarding "inheritance"...
|
by: sajithamol |
last post by:
I have a dll of a VB application which performs image manipulations. I want to build this dll file into a .cab file to embed this in the Object tag in client side. Also how to generate the classid...
|
by: Veloz |
last post by:
Hiya
My question is whether or not you should associated related objects in
your software using a scheme of id's and lookups, or wether objects
should actually hold actual object references to...
|
by: busiswa |
last post by:
Hi All,
I am just new in PHP, i am asked to draw a combobox using the draw() method. Can someone help me on how to go about that.
Thank you,
Busi
|
by: Duggi |
last post by:
I used to wonder why MS implemented C# to accept the following code
using (Font f = new Font())
{
// some code here.
}
While the same can be achieved through
{
|
by: Duggi |
last post by:
I used to wonder why MS implemented C# to accept the following code
using (Font f = new Font())
{
// some code here.
}
While the same can be achieved through
{
|
by: Charles Arthur |
last post by:
How do i turn on java script on a villaon, callus and itel keypad mobile phone
|
by: ryjfgjl |
last post by:
If we have dozens or hundreds of excel to import into the database, if we use the excel import function provided by database editors such as navicat, it will be extremely tedious and time-consuming...
|
by: ryjfgjl |
last post by:
In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...
|
by: BarryA |
last post by:
What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...
|
by: Sonnysonu |
last post by:
This is the data of csv file
1 2 3
1 2 3
1 2 3
1 2 3
2 3
2 3
3
the lengths should be different i have to store the data by column-wise with in the specific length.
suppose the i have to...
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However,...
|
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers,...
|
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven...
|
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each...
| | |