Running Graphics Effect In Paint Event Of Form (Screensaver)
Mar 18, 2011
Running a graphics effect in the Paint event of a Form. I am thinking of something like a screensaver effect, not necessarily full-screen either. Would a background worker be better suited to this idea or using another thread? I wouldn't want something that is very demanding on a computer processor. In fact, what I was originally thinking, is it possible to put a Windows screensaver program inside a Form?
Installing VB6 on Windows 7
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Mar 22, 2012
This is a working example which draws a rectangle on different location every timer_tick and I fully understand now how it's working:
Code:
Dim i, timercount As Integer
Private Sub PictureBox1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles PictureBox1.Paint
[code]....
Now I'm looking for a way to draw this rectangles without refreshing them every single tick. I've just started using Visual Basic and I really don't know how to call/raise PictureBox1_Paint event every timer_tick or how to store drawing data in member variables?
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Apr 2, 2009
This one is killing me. I don't think this would be so difficult if M$ documentation was to the point and talked in normal speak (I guess they don't understand KISS).it seems unnecessarily difficult to raise a paint event without a picturebox getting redrawn (all existing graphics erased). Invalidate, Refresh and Update all erase the picturebox. All I want to do is get the procedure ( with Handles Picturebox1.paint) to fire so I can draw to it without erasing what is already there. I looked into the RaiseEvent statement but there are a zillion errors that pop up for one reason or another telling me I can't do it. So: 1. How the heck can I get this to work? 2. Does anyone know of a great book on vb.NET that doesn't try to impress anyone with it's command of the English language, but instead teaches. As far as I can tell, M$ is full of themselves in a major way?
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Nov 20, 2009
I've got this code which draws a line and it moves down to a point then two curves are drawn coming off of it. I need to get it to repeat itself after a short period, so there's a constant flow of lines moving down then becoming curves.[code]
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Apr 17, 2010
I have tried to realign the image by down and right one pixel, but still only part of the first row and column are visible when zoomed.I can't find exactly what I'm looking for online.
My computer is an HP-Pavillion dv9600 Notebook PC.
OS: Windows Vista SP2 32-bit
The following code reproduces the problem:
Public Class PictureBug
Dim pxlColor As Color
Dim img As Bitmap = New System.Drawing.Bitmap(My.Resources.TestBug[code]......
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Oct 23, 2010
I was able to search this code : [URL] but i need a help in modifying this code so that i can re-size the form from bottom left corner the code block below is resizing the from from bottom right corner i need that to be modified to convert it to bottom left corner
[Code]...
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Sep 10, 2009
Weird issue: I have application that I fire some code in the Form_Paint event for the main form, it works fine on my machine, but on other machines is not working at all.
I tried to debug the code on the other machine, and Form_Paint event is not triggered at all!
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Nov 12, 2011
i've an owned form that never raise the paint event, and so i can't make it rounded...
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Nov 11, 2011
during the development of my project, i've the need to raise the paint event of a form, to make it with rounded angle.The strange thing is that, when i use the invalidate comand on it, the repaint event (that sometimes doesn't go and i don't know why), doesn't make it like i need, that is, the dimension of the side is one instead of six pixel, and the angle are rounded, but the border is not visible.
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Sep 3, 2009
I have the following code for a gradient form below. When I step through my code it seems to fire constantly. Does this mean that it fires constantly at run-time? If so, is there a way to stop it from firing constantly
Private Sub Form1_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
Dim Mybrush As New System.Drawing.Drawing2D.LinearGradientBrush(Me.ClientRectangle, Color.LightSkyBlue, _
Color.Snow, Drawing2D.LinearGradientMode.Vertical)
e.Graphics.FillRectangle(Mybrush, Me.ClientRectangle)
End Sub
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Apr 17, 2009
[Code]....
I add a button to a form each time the user clicks a menu option as:
[Code]....
This draws a small blue line at the bottom of the button to show it is highlighted. Just like the mouseoverbackcolor property on a button except this will draw the line. It works fine until you slide the mouse very fast between the buttons. It is as if the mouseleave event doesnt always fire.
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Feb 7, 2011
The following zipped up Visual Studio Solution on Skydrive is immediately buildable and runnable; a usercontrol on a Form. Problem? If you click on any of the Edit Buttons and move the Horizontal Scroll, the values as they change in the Label_Values are off by one when you release the slider button. I think this is a timing problem between the Paint handler and the Horizontal Scroll event handler at the very bottom of the User Control code. Sorry I didn't eliminate
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Feb 21, 2009
What language is the best if you want to make a large paint program (such as photoshop)? And how can I paint the best way, so I have much possibillities?
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May 29, 2009
This little experiment was a test prompted by a previous thread to learn to work in a graphics object, then paint everything later to a picturebox (later, will be looking at building own custom control for the display), and save out the bitmap to a file on the HD.But weird things happen here. Nothing will display in the picturebox, and the saved bitmap is just a black box.The only partial success I had was replacing: e.Graphics.DrawImage(MyBitmap, 0, 0)
with,
PictureBox1.image = MyBitmap
inside the paint event handler, but that caused infinite recursion of the paint event. But at least I could see parts of the graphic for a fraction of a second before it was wiped clean, every time I clicked the "Go_cmd" button. But what is weird is that this partial success showed that the graphics object was copying successfully over to the bitmap image (because I could briefly see parts of it in the picturebox, but the saved file would still come out black, even though it was based on the same bitmap!The code is as follows.Above the form1 class
Imports System.Drawing.Imaging
The single declaration:
Public MyBitmap As Bitmap
The form_load procedure:[ code].....
The code in the version shown above would not even show a brief moment of the graphics in the picturebox, and the saved .bmp file is just a filled black box.
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Aug 26, 2009
I've got a basic idea of what i'm wanting to do, just been out of it too long to remember how to do it. I'm wanting to load an image, not display it. Get all the pixel data, then redraw the image pixel for pixel in mspaint.
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Jul 9, 2010
First forms project. My textbook [wrox VB 2880 Programmer's Reference, Rod Stephens] gives snippet that starts with [which intnellisense completes, except for variable names, including trailing 'paint' which seems to be the problem]
Public Class Form1
Private Sub form1_paint(ByVal sender As Object, ByVal e As System.Windows.Forms.TableLayoutCellPaintEventArgs) Handles MyBase.Paint
End Sub
End Class
which generates error :
Error 1 Method 'Private Sub form1_paint(sender As Object, e As System.Windows.Forms.TableLayoutCellPaintEventArgs)' cannot handle event
'Public Event Paint(sender As Object,
e As System.Windows.Forms.PaintEventArgs)' because they do not have a compatible signature
.
Changing 'Private' to 'Public' does not fix the error.
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Nov 4, 2009
Back in the VB6 days, I could count on frmWhatever_Resize() to be fired when a form is loaded. That doesn't still seem to be the case. Since my resize event is filled with all the code I want that adjusts the size and placement of things, I decided to just call it from the end of the form's load event. That has no affect. I'm guessing that the form isn't actually shown until form_load is finished?
is there some other event that is fired when a form is shown, so I can call my resize code there?
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Feb 15, 2012
How can I cause the Paint event to fire from a Form_Click() event? This is what I'm trying to do...
Public Class StrTests01
Private Sub StrTests01_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Click
Dim ps As Graphics = Me.CreateGraphics()
[code]....
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May 11, 2012
I tried to make a menu for my game, but when I placed the code into the form loading event, it wouldn't show. Then I placed a button and moved the code into the button click event and it worked. Thus, I know the code shouldn't be wrong. How can you make the graphics( as in lines, rectangle,etc) show up when it starts up?
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Oct 3, 2009
The only way I know to force a paint event in my pictureboxes is to do a 'Picturebox1.invalidate'. I read that this isn't the best way to do it though, so what's the best way to make my picture boxes repaint?
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Nov 28, 2009
I was wondering how i would go about threading a paint event. I know the basic multithreading but i cant figure out how i would go about applying this on a paint event. This is the way i know how to go about multithreading.
[Code]...
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Mar 27, 2011
so im making a projectile motione simulator for physics project got it all working and im drawing the path of the object with this code
e.Graphics.DrawRectangle(Pens.Red, 25 + xcord(counter1), 600 - ycord(counter1), 1, 1)
however it will draw it behind objects for example if i have a groupbox it will draw(i assume its still drawing at leaste) behind the group box and i cant see it
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Dec 29, 2010
[url]... I managed to figure out how to paint a bitmap on a form. With some slight modification, I managed to make it so that the position of the bitmap can change based on key strokes.However, for some reason, it only does this once. It can't be that the xPosition and yPosition aren't responding since I rigged two labels to tell me their values and they are changing. So how can I make the bitmap respond.[code]...
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May 19, 2012
I want to create a track bar using paint event, but the problem is on mouse move event<Me.Invalidate()> is very slow since the graphic become unvisible for milli seconds and then return back, is there a way to make it faster?(doesn't become invisible)
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Jul 23, 2007
correct way to draw rectangles onto a picturebox, and also to explain the paint event more clearly.Basically I have an application where a picturebox contains an image, this image is a small computer monitor as such:
The idea of this part of my application is that the user can draw small window size rectangles which represent windows later on. I have already used some excellent code on this forum to be able to draw the rectangles on the picturebox (As pictured above), the rectangle outline is drawn from MouseDown and MouseUp respectivley.
The problem I am encountering is with the 'repainting' of this rectangle. I have included code to repaint the rectangle in the Paint event of the picturebox. This works when you move the picturebox 'off screen' and bring it back. However when the form is re-sized or other various things occur the rectangle is not re-drawn? even though the picturebox 'appears' to be clean and always there!
My code is below, it is not full and complete, but the few main subs listed should give an indication as to how I am currently creating the rectangle:
Private Sub picboxAdvDisplay_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles picboxAdvDisplay.MouseDown
'Set the flag for Drawing enabled
[code]....
1. What is the CORRECT way to draw a rectangle onto a Picturebox?
2. How do you code so that the rectangle is ALWAYS visible/drawn on a form re-size, minimise, window overlap etc etc.
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Aug 18, 2009
the code below doesn't works...
[Code]...
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Oct 14, 2009
I've got a bug in my program that I can't work out, during a paint event. The only way I can think to solve it is to watch the screen being updated one thing at a time. Problem is, I've put a break in and then I try stepping through the program one line at a time, but when I go to look at the screen it's blank - probably because I'm in the middle of a paint event? Is there some way that I can get my screen to update after each command?
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Mar 31, 2009
I am trying to use the key's W and S to change the Y cordinate of a rectangle. The key's work, but the graphic doesnt update [code]...
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Aug 26, 2009
From jmchillihiney's most excellent code bank sumission on Drawing:Quote:The way GDI+ works, controls get repainted on screen over and over again, sometimes many times in quick succession. On each of these occasions the control's Paint event is raised. You need to use the Paint event of the control to perform your own drawing or else, the next time the control is repainted, your drawing will just disappear as the control paints over it.
When you're creating a custom control you should override the OnPaint method and perform your drawing there. When you're designing a form or user control and you want to add custom drawing to a child control you handle that control's Paint event, then perform your drawing in the event handler.
You may have seen, or heard people talk about, controls flickering on screen. That's caused by repainting large areas of the control repeatedly and happens because painting on screen is actually quite a slow process. As such, you should try to do as little of it as possible.So, I am attempting to draw part of a custom control. I have placed a SplitContainer on a UserControl, and oriented it vertically. I then shrunk to top panel to 15 pixels in height. I have two Methods which each draw a different type of Path + fill into the panel, and then draw a border around it (One is a gradient fill, and the other is just a plain color). The idea is that when the user clicks on this panel, it switches from one to the other (a "Selected State" and "Not-Selected" state).
I have also created an icon which looks like the +/- widget on a treeview (or more specifically, on the vs2008 Toolbox, which is essentially what I am trying to emulate here . . .) which toggles as the control is selected/unselected. Not that ultimately, the selected state will change when the user selects OTHER controls, but the Expand/Collapse gizmo will toggle when the user clicks on the panel in question.
Again, check out the vs2008 toolbox. The Group "headers" are what I am after here. Believe it or not, all of this now WORKS (gee me, look what I did!) EXCEPT the initialization. If I "Handle" the paint event of the SplitCOntainer.Panel1 object in any way which prevents the flickering jmc alludes to above, any redrawing required by either initialization OR hiding/unhiding of the host form is prevented. And it seems like the SplitContainer panel is constantly redraing (probably checking to see if the splitter has been moved).
I can post some code, but it is a little confusing, since I am dealing with some semi-complex interaction here. Also, It is not necssecarily structured well ()yet). AFTER I figured out the drawing bits, THEN I was going to try to do some refactoring and restructuring. Code Follows in next post.
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Jul 19, 2009
When I use the code below, I can't get any (copy)effect as I drag things onto the picture box(img). Therefore, I can't dragdrop files. How can I make dragdrop event possible?
[Code]....
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