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Question

Answer 1

+1 A:

PictureBox1.Image = Nothing

adatapost 2009-09-10 06:20:58

i already used this code .but there have an issue that when i click the clearbutton the image will cleared.but the mouse over on the picturebox the last drawn image will appear.

2009-09-10 06:33:58

Can I see the code of MouseHover event? You may also add/remove event handler programatically. **RemoveHandler PictureBox1.MouseHover, AddressOf PictureBox1_MouseHover**

adatapost 2009-09-10 07:00:24

'i using this code in the piicturebox1_paintmyusercolor=(sysytem.drawing.color.black)myalpha=100using g as graphics=graphics.fromimage(picturebox1.image)g.clear(color.white)dim currentpen as object=new pen(color.fromargb(myalpha,myusercolor),mypenwidth)g.drawpath(ctype(currentpen,pen),mousepath)end using'using in the form_loadpicturebox1.image=new bitmap(.....)'in the clearbutton_clickpicturebox1.image=nothing

2009-09-10 09:28:34

Answer 2

A:

bool clearImage;
clearButton_Click(...)
{
  clearImage = true;
  img.Invalidate();
}

img_Paint(...)
{
  if (clearImage)
  {
    clearImage = false;
    e.Graphics.Clear(Color.White);
  }
}

VB.NET

Private clearImage As Boolean 
Private Sub button_click(ByVal sender As Object, ByVal e As eventargs) Handels....
    clearImage = True
    img.Invalidate()
End Sub
Private Sub img_Paint(ByVal sender As Object, ByVal e As ...) Handels ....
    If clearImage Then
        clearImage = False
        e.Graphics.Clear(Color.White)
    End If
End Sub

Petoj 2009-09-10 06:24:19

how can i use this code

2009-09-10 11:14:21

declare a bool clearImage in the form. then double click the button so that you get the _Click event and add the code i wrote in the event. click on the image and find the paint event and add the code in the paint event?

Petoj 2009-09-10 11:33:44

img is your picturebox and clearButton is your button.

Petoj 2009-09-10 11:41:33

is this vb code?

2009-09-10 11:49:16

using this code in the piicturebox1_paint myusercolor=(sysytem.drawing.color.black) myalpha=100 using g as graphics=graphics.fromimage(picturebox1.image) g.clear(color.white) dim currentpen as object=new pen(color.fromargb(myalpha,myusercolor),mypenwidth) g.drawpath(ctype(currentpen,pen),mousepath) end using 'using in the form_load picturebox1.image=new bitmap(.....) 'in the clearbutton_click picturebox1.image=nothing

2009-09-10 11:50:26

no this is c# code wait 2 seconds and ill edit it and add vb.net code

Petoj 2009-09-10 12:17:25

than you.but i used this code.but no chage.the image tha i drawn last will display on the mouseover.

2009-09-11 06:25:02

Then you have some thing else that is doing this it should be cleared!

Petoj 2009-09-11 12:03:56

Answer 3

A:

There might be some logic error in your code. Check the mousemove or mousehover event and make sure it is not assigning an image to the picturebox.

Instead of assigning nothing to the new image with the button, you could clear the the existing image. This might be better because you won't have to create a new image before you can draw on it again.

g = Graphics.FromImage(PictureBox1.Image)
g.Clear(PictureBox1.BackColor)

xpda 2009-09-10 07:33:08

'i using this code in the piicturebox1_paintmyusercolor=(sysytem.drawing.color.black)myalpha=100using g as graphics=graphics.fromimage(picturebox1.image)g.clear(color.white)dim currentpen as object=new pen(color.fromargb(myalpha,myusercolor),mypenwidth)g.drawpath(ctype(currentpen,pen),mousepath)end using'using in the form_loadpicturebox1.image=new bitmap(.....)'in the clearbutton_clickpicturebox1.image=nothing

2009-09-10 09:24:30

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clearing the image in a picturebox

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