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.NET Forum / .NET Framework / Performance / October 2004background images slow
Hi all, I'm working on an application and want to use background images for forms and controls. Using the images itself is not a problem, but when I run my application it becomes really slow and my CPU usage goes up to 100% for a time... Is there a better way of setting background images? It's just 3 images I think, all pretty small, and I already created the objects for the images and set them to the controls at runtime so that it uses only 3 objects and not new instances for every control. But still... It can't be that hard just to show a couple of images...? Many thanks for your help... Andreas > It can't be that hard just to show a couple of images...? I think it is.... GDI is pretty prehistoric in some ways.... It's why background image are so uncommon, prefer tghe background color property... or wait for longhorn ;-) > Many thanks for your help... > Andreas > It's why background image are so uncommon, prefer tghe background color > property... Well it looks like this is my only option, because I don't want my program to look so slow, just because of a simple background image... wanted to have a simple multi colour bg as in office 2003... do you happen to know if there's a way to have multiple colours with a transition as background? Thanks, Andreas use the gdi drawing gradient. If thats not good enough in performance, drop .net and write MFC c++ code > > It's why background image are so uncommon, prefer tghe background color > > property... [quoted text clipped - 6 lines] > Thanks, > Andreas Andreas, I've used the following In my Forms in both VS.NET 2002 & VS.NET 2003 without any real performance problems... Protected Overrides Sub OnResize(ByVal e As System.EventArgs) MyBase.OnResize(e) If Not Me.BackgroundImage Is Nothing Then Me.BackgroundImage.Dispose() Me.BackgroundImage = Nothing End If Dim image As New Bitmap(Me.ClientSize.Width, Me.ClientSize.Height) Dim gr As Graphics = Graphics.FromImage(image) Dim rect As New Rectangle(New Point(0, 0), Me.ClientSize) Dim brush As New LinearGradientBrush(rect, _ Color.RosyBrown, ControlPaint.LightLight(Color.RosyBrown), _ LinearGradientMode.Vertical) brush.SetBlendTriangularShape(0.33) gr.FillRectangle(brush, rect) gr.Dispose() Me.BackgroundImage = image End Sub The image is always the same size as the form, so there is no tiling going on. Just set the BackColor of controls that support it to Transparent, they will then pick up the colors from the above Image. Hope this helps Jay >> It's why background image are so uncommon, prefer tghe background color >> property... [quoted text clipped - 6 lines] > Thanks, > Andreas > I've used the following In my Forms in both VS.NET 2002 & VS.NET 2003 > without any real performance problems... Thanks Jay, tried this, and at least it's better. Still slow, but not as bad as with an image. Thanks very much for your help everyone! Andreas Andreas, Only the form itself should have the background image. All your controls should have BackColor = Transparent. Can you define "slow", when is it "slow" specifically. Can you post a 20-25 line program (or email me) that accurately shows that it is slow? As using the above routine, the only time it is even close to "slow" is when you resize the form itself. Even then on a 866 PIII, I don't really notice it as being slower then normal (it flickers slightly, but that's about it). Hope this helps Jay >> I've used the following In my Forms in both VS.NET 2002 & VS.NET 2003 >> without any real performance problems... [quoted text clipped - 3 lines] > Thanks very much for your help everyone! > Andreas Jay, > Only the form itself should have the background image. > > All your controls should have BackColor = Transparent. yes, that's what it is. > Can you define "slow", when is it "slow" specifically. it's slow when I'm showing a panel which contains 3 listBox controls with splitters in between and another (transparent) panel. I'm setting the DockingState of the panel to Fill at runtime and change the visibility of the panel to visible. And that's what takes time... not the backgroundimage itself, just the (automatic) resizing of the controls (according to their Fill state). You see them appearing and resizing, one by one. But it's really better now than before with an image from a file. So again, many thanks! Andreas Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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