I am attempting to display a very large graphical representation of some data. I am using a bitmap for persistent storage of the image and e.Graphics.DrawImage(myBitmap, new Point(0,0)) in the onPaint of a PictureBox control on my form. I have noticed (and heard mentioned on other sites) that if my image has a height or width greater t...
I have 3 data graphs that are painted via the their paint events. When I have data that I need to insert into the graph I call the controls invalidate() command. The first control's paint event actually creates a bitmap buffer for the other 2 graphs to avoid repeating a long loop. So the invalidate commands are in a specific order (1,...
hello everybody, I am making a simple form with two semi-transparent texts and i put it in a paint event. only, when I wider the form, the texts turn darker and grainy. actualy I want the darker color but not the grainy effect. here is my code snippet: private void sbfToolBox_Paint(object sender, PaintEventArgs e) { System.Drawing...
I whant to draw a table in C# Windows Forms using GDI+. When the number of rectangles is too large for all rectangles to be displayed on the form, it does not scroll. And can not access those who did not fit the form. What I need to do to see everything I drawing on the form? Thanks. ...
I am developing in C# and .Net 2.0. I have a user control that draws cells (columnar) depending upon the maximum number of cells. There are some drawing routines that generate the necessary cells. There is a property NumberOfCells that adjust the height of this control; CELLHEIGHT_CONSTANT * NumberOfCells. The OnPaint() method is overr...
Imagine the following scenario: this.SetStyle(ControlStyles.UserPaint, true); //this doesn’t change anything … void OpenSomeForm() { SomeForm sf = new SomeForm(); sf.SomeEvent += new … (SomeEventOcurred); sf.ShowDialog(); } private void SomeEventOcurred(…) { OnePanelInThisForm.Invalidate(); } private void OnePanelInT...
After executing some new code, my C++ application started to behave strange (incorrect or incomplete screen updates, sometimes no screen updates at all). After a while we found out that the new code is causing an Access Violation. Strange enough, the application simply keeps on running (but with the incorrect screen updates). At first ...
I want to draw directly on the desktop in C#. From searching a bit, I ended up using a Graphics object from the Desktop HDC (null). Then, I painted normally using this Graphics object. The problem is that my shapes get lost when any part of the screen is redrawn. I tried a While loop, but it actually ends up drawing as fast as the appli...
I'm trying to figure out why I've been getting an empty update rectangle when I call InvalidateRect on a transparent window. The idea is that I've drawn something on the window (it gets temporarily switched to have an alpha of 1/255 for the drawing), and then I switch it to full transparent mode (i.e. alpha of 0) in order to interact wi...
Hi Guys, I want to ask for suggestions on how to optimize a repaint in Compact Framework? GetHashCode() didn't help because it always return a different hash code. Anyway, I have a program which you can drag and resize an object in run time. This object is a transparent object and it has a PNG image which also dynamically resize relati...
I have an existing OnPaint method which draws some shapes: protected override void OnPaintBackground(PaintEventArgs e) { Graphics g = e.Graphics; g.CompositingQuality = CompositingQuality.HighQuality; Brush greenBrush = new SolidBrush(Color.FromArgb(73,172,113)); Brush blueBrush = new SolidBrush...
I need to write some text to a paintbox, and I do it in the OnPaint event. When I set the fontsize twice in the method, the OnPaint-event is called repeatedly. To see for yourself, try this: Create a new VCL Forms application Place a paintbox on the form Put the following code in the OnPaint-event: procedure TForm1.PaintBox1Paint(S...
Hi, I am not sure what is the best way of using graphics - should I attach my classes to main form Paint event and then do the drawing, or it is better to call it from overidden OnPaint void like this? I mean, is it OK to do that like this: protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e) //what is this good for?...
I have created a custom control which derives from Panel. I use it to display an Image using BackgroundImage property. I override the OnClick method and set isSelected to true then call Invalidate method and draw a rectangle in overrided OnPaint. Everything goes just fine until I set DoubleBuffered to true. The rectangle is drawn and the...
Hello, comrades) I've found some interesting behavior of Invalidate method in multithreaded applications. I hope you could help me with a problem... I experience troubles while trying to invalidate different controls at one time: while they're identical, one succesfully repaints itself, but another - not. Here is an example: I have a f...
I'm new to c#, and trying to learn by writing some simple apps to get familiar with the syntax and .NET library. The most recent miniproject I took on is a polar clock like the one found here. One of the problems I noticed early on was that the app would constantly "flicker", which really took away from the presentation, so I read onli...
I use ToolStripProgressBar.Paint event handler to do custom drawing on tspb control. As the code below: private void tsPB_Paint(object sender, PaintEventArgs e) { var pb = sender as ToolStripProgressBar; var g = e.Graphics; var r = e.ClipRectangle; ; var f = SystemFonts.DefaultFont; var text = string.Format("...
how to make a tmemo and Tedit with a transparent background? or add image background on it's canvas. that workable in both Delphi7 up ...
Consider the following overriden OnPaint method for a .NET Control: protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); e.Graphics.RotateTransform(180); // lots of drawing code } Is it a problem that I do not restore the state of the e.Graphics object when I am finished? In Java this is often done by making...
Given the following code. Is there any potential for the first DrawString method to draw in Arial rather than Times New Roman? protected override void OnPaint(PaintEventArgs pe) { Font f = new Font("Times New Roman", this.TextSize); pe.Graphics.DrawString("Test 1", f, Brushes.Black, loc); f = new Font("Arial", this.TextSiz...