onpaint

I have added an OnPaint() function to my dialog class but its not getting called after dlg.DoModal()

由 纵饮孤独 提交于 2019-12-12 18:17:46
问题 Can anyone please help me understand how to override OnPaint() for a dialog class derived from CDialog . Here is the code: ColorImageDlg *pDlg = NULL; pDlg = new ColorImageDlg; pDlg->DoModal(); delete pDlg; I'm overriding OnInitDialog() and it's getting called. But while overriding OnPaint() it is not getting called. Can any one please help me fixing it? 回答1: First of all what is the point of creating the instance of the dialog on heap? You can simply do: ColorImageDlg dlg; dlg.DoModal(); You

How to add icons to TreeView control in c# using OnPaint args

由 爷，独闯天下 提交于 2019-12-12 17:24:13
问题 How to add icons to TreeView control in c# WITHOUT the ImageList control? I think you need tp call the OnPaint event args but no idea how to do it. 回答1: Yo have to code OwnerDraw control. Unless you have not really serious reasons, avoid this, as this can turn out into very complicated scenarios, if you want to do it in a good way. Have a look on this example. DrawNode event 回答2: You can override OnDrawNode() and set DrawMode to TreeViewDrawMode.OwnerDrawAll . However, you will soon realise

MemDC in OnPaint()-function

由 孤者浪人 提交于 2019-12-10 12:08:16
问题 My OnPaint() function calls several other drawing functions. void CGraph::OnPaint () { CPaintDC dc(this); // CMemDC DC(&dc); dc.SetViewportOrg (0, 400); dc.SetMapMode(MM_ISOTROPIC); dc.SetWindowExt(1000, 800); dc.SetViewportExt(1000, -800); ProcessData (); DrawCoordinateSystem (&dc); DrawGrid (&dc); DrawGraph (&dc); } Example of DrawCoordianteSystem: void CGraph::DrawCoordinateSystem (CDC* pDC) { CPen PenBlack (PS_SOLID, 1, RGB(0, 0, 0)); pDC->SelectObject (PenBlack); // Rectangle round the

Create custom ComboBox with rounded corners in Windows Forms

由 与世无争的帅哥 提交于 2019-12-09 23:35:57
问题 I want to create a custom combo-box with rounded corners and gradient color. I have implemented the same feature in Button by overriding the OnPaint method. But it is not working for ComboBox . Any help will be appreciated. The code I am using for overriding OnPaint is given below: protected override void OnPaint(PaintEventArgs paintEvent) { Graphics graphics = paintEvent.Graphics; SolidBrush backgroundBrush = new SolidBrush(this.BackColor); graphics.FillRectangle(backgroundBrush,

How do I draw a transparent rectangle?

由 一世执手 提交于 2019-12-08 13:35:32
问题 I am nearly there with this ... :) I have implemented my own double buffer ... So I create a bitmap: if (_Bitmap != null) _Bitmap.Dispose(); if (_Graphics != null) _Graphics.Dispose(); _Bitmap = new Bitmap(Bounds.Width, Bounds.Height); _Bitmap.MakeTransparent(Color.Transparent); _Graphics = Graphics.FromImage(_Bitmap); _Graphics.FillRectangle(Brushes.Transparent, Bounds); I thought that I might have to manually set the bitmap as transparent. In my handlers OnPaint method it does this:

Onpaint events (invalidated) changing execution order after a period normal operation (runtime)

由 China☆狼群 提交于 2019-12-07 17:38:40
问题 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 (1,2,3). This works well, however when the graphed data reaches the end of the graph window (PictureBox) where the data would normally start scrolling, the paint

Why is my c# paint method running out of memory?

由 依然范特西╮ 提交于 2019-12-07 11:43:42
问题 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 online about how to implement a double buffer, which eliminated this problem, but may or may not have something to do with the problem. Here is my onPaint method;

Exceptions and Access Violations in Paint events in Windows

由 主宰稳场 提交于 2019-12-06 05:38:25
问题 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 we thought the problem was caused by a "try-catch(...)" construction (put there by an overactive ex-colleague), but several hours later (carefully inspecting

Why is my c# paint method running out of memory?

由 只谈情不闲聊 提交于 2019-12-05 12:18:36
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 online about how to implement a double buffer, which eliminated this problem, but may or may not have something to do with the problem. Here is my onPaint method; it is called every 33ms (~30 FPS) by a timer control. Most of the rest of the app is simply handlers

Graphics DrawString to Exactly Place Text on a System.Label

由 雨燕双飞 提交于 2019-12-05 02:54:35
问题 I have overridden the OnPaint method of my Label control in VS2008: void Label_OnPaint(object sender, PaintEventArgs e) { base.OnPaint(e); dim lbl = sender as Label; if (lbl != null) { string Text = lbl.Text; e.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; if (myShowShadow) { // draw the shadow first! e.Graphics.DrawString(Text, lbl.Font, new SolidBrush(myShadowColor), myShadowOffset, StringFormat.GenericDefault); } e.Graphics.DrawString(Text, lbl.Font, new
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