CreateGraphics logic

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  • vijay_3491@rediffmail.com
    #1

    CreateGraphics logic

    Hi,

    How to write a CreateGraphics method for a class similar to
    form.CreateGrap hics()?

    Pls help. Thanks in Advance.



    Tags: None
    • Nicholas Paldino [.NET/C# MVP]
      #2
      Re: CreateGraphics logic

      Well, what kind of class do you want to generate a device context for
      (which the Graphics class is really a wrapper for).

      What exactly are you trying to do? The device context is something that
      is typically generated for you. Unless you have some sort of output device
      which windows doesn't handle (which would be wrong, since you should go
      through the hardware abstraction layer to get a device context to output on
      anyways), you really shouldn't be creating a Graphics instance yourself.

      --
      - Nicholas Paldino [.NET/C# MVP]
      - mvp@spam.guard. caspershouse.co m

      <vijay_3491@red iffmail.comwrot e in message
      news:346b0164-c5c0-417f-b8ff-b05b92e522e2@e2 5g2000prg.googl egroups.com...
      Hi,
      >
      How to write a CreateGraphics method for a class similar to
      form.CreateGrap hics()?
      >
      Pls help. Thanks in Advance.
      >
      >
      >

        Comment

        • Ben Voigt [C++ MVP]
          #3
          Re: CreateGraphics logic


          "Nicholas Paldino [.NET/C# MVP]" <mvp@spam.guard .caspershouse.c omwrote in
          message news:OOIrou9RIH A.4476@TK2MSFTN GP06.phx.gbl...
          Well, what kind of class do you want to generate a device context for
          (which the Graphics class is really a wrapper for).
          >
          What exactly are you trying to do? The device context is something
          that is typically generated for you. Unless you have some sort of output
          device which windows doesn't handle (which would be wrong, since you
          should go through the hardware abstraction layer to get a device context
          to output on anyways), you really shouldn't be creating a Graphics
          instance yourself.
          Most likely Graphics.FromIm age is appropriate, see
          http://msdn2.microsoft.com/en-us/lib...fromimage.aspx
          >
          --
          - Nicholas Paldino [.NET/C# MVP]
          - mvp@spam.guard. caspershouse.co m
          >
          <vijay_3491@red iffmail.comwrot e in message
          news:346b0164-c5c0-417f-b8ff-b05b92e522e2@e2 5g2000prg.googl egroups.com...
          >Hi,
          >>
          >How to write a CreateGraphics method for a class similar to
          >form.CreateGra phics()?
          >>
          >Pls help. Thanks in Advance.
          >>
          >>
          >>
          >
          >

            Comment

            • vijay_3491@rediffmail.com
              #4
              Re: CreateGraphics logic

              Hi Nicholas/Ben,

              Thanks for your reply.

              I too used the Graphics.FromIm age() but I am facing some problems
              using it in my control. Is there any other way to get the graphics?




              On Dec 26, 9:28 pm, "Nicholas Paldino [.NET/C# MVP]"
              <m...@spam.guar d.caspershouse. comwrote:
                  Well, what kind of class do you want to generate a device context for
              (which the Graphics class is really a wrapper for).
              >
                  What exactly are you trying to do?  The device context is something that
              is typically generated for you.  Unless you have some sort of output device
              which windows doesn't handle (which would be wrong, since you should go
              through the hardware abstraction layer to get a device context to output on
              anyways), you really shouldn't be creating a Graphics instance yourself.
              >
              --
                        - Nicholas Paldino [.NET/C# MVP]
                        - m...@spam.guard .caspershouse.c om
              >
              <vijay_3...@red iffmail.comwrot e in message
              >
              news:346b0164-c5c0-417f-b8ff-b05b92e522e2@e2 5g2000prg.googl egroups.com...
              >
              >
              >
              Hi,
              >
              How to write a CreateGraphics method for a class similar to
              form.CreateGrap hics()?
              >
              Pls help. Thanks in Advance.- Hide quoted text -
              >
              - Show quoted text -

                Comment

                • Nicholas Paldino [.NET/C# MVP]
                  #5
                  Re: CreateGraphics logic

                  You still haven't answered the question. What are you trying to get the
                  graphics instance of? Are you trying to manipulate an image? Or are you
                  trying to custom paint your control?

                  If you are trying to custom paint your control, and you are in a class
                  that derives from that control, then you can override the OnPaint method and
                  get the Graphics instance from the PaintEventArgs that is passed in to the
                  method.

                  If you want to do this outside of the control, you will have to
                  subscribe to the Paint event and then get the Graphics instance from the
                  PaintEventArgs passed to the event.


                  --
                  - Nicholas Paldino [.NET/C# MVP]
                  - mvp@spam.guard. caspershouse.co m


                  <vijay_3491@red iffmail.comwrot e in message
                  news:c0a2af5b-27d5-4394-9101-7eaf4e567872@l6 g2000prm.google groups.com...
                  Hi Nicholas/Ben,

                  Thanks for your reply.

                  I too used the Graphics.FromIm age() but I am facing some problems
                  using it in my control. Is there any other way to get the graphics?




                  On Dec 26, 9:28 pm, "Nicholas Paldino [.NET/C# MVP]"
                  <m...@spam.guar d.caspershouse. comwrote:
                  Well, what kind of class do you want to generate a device context for
                  (which the Graphics class is really a wrapper for).
                  >
                  What exactly are you trying to do? The device context is something that
                  is typically generated for you. Unless you have some sort of output device
                  which windows doesn't handle (which would be wrong, since you should go
                  through the hardware abstraction layer to get a device context to output
                  on
                  anyways), you really shouldn't be creating a Graphics instance yourself.
                  >
                  --
                  - Nicholas Paldino [.NET/C# MVP]
                  - m...@spam.guard .caspershouse.c om
                  >
                  <vijay_3...@red iffmail.comwrot e in message
                  >
                  news:346b0164-c5c0-417f-b8ff-b05b92e522e2@e2 5g2000prg.googl egroups.com...
                  >
                  >
                  >
                  Hi,
                  >
                  How to write a CreateGraphics method for a class similar to
                  form.CreateGrap hics()?
                  >
                  Pls help. Thanks in Advance.- Hide quoted text -
                  >
                  - Show quoted text -

                    Comment

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