Populate ComboBox with line styles .NET
How could I populate a ComboBox (or a ToolStripComboBox like in the image) with line styles .NET? ...
gdi+
How do I Convert ARGB value from string to colour?
I am trying to use the MakeColor method in the GDIPAPI unit but the conversion from int to byte is not returning me the correct value. Example var argbStr: string; A, R, G, B: Byte; begin argbStr := 'ffffcc88'; A := StrToInt('$' + Copy(AValue, 1, 2)); R := StrToInt('$' + Copy(AValue, 3, 2)); G := StrToInt('$' + ...
Hiding Mouse Pointer on window Screen using GDI in c++
How to hide the mouse pointer on the window screen of GDI, kindly give me some hints. ...
Can we move shape (Diamond) in C#
I want to move a Diamond Shape in the form(for example 2 pixels every 200ms) horizantally. I used the following code in From_Paint Event. private void Form1_Paint(object sender, PaintEventArgs e) { Graphics g = e.Graphics; Point p1 = new Point(5,0); Point p2 = new Point(10, 5); Point p3 = new Point(5, 10); Point p4 =...
Squigglly line under a word (Win32)
I want to implement basic spell checking in a Notepad clone project I'm doing. I want to underline misspelled words with a squiggly like like Word does. I think I need to use GDI and draw on the text field, but I'm not sure how to draw on controls. Thanks ...
Using gdi+ with InteropBitmap
Is it possible to use WPF's InteropBitmap together with gdi+ ? Any examples ? (I need it for 2D drawing, many small objects; I know how to use gdi+ with WriteableBitmap => (see post by Danko) , but after all I've read InteropBitmap should be faster) fritz ...
Drawing with GDI+ under IIS
I'm running a web application under IIS that we draw graphs with that are sent to the clients. We were previously running under iis6, while migrating to 2008 ( iis7 ) we have encountered some very weird issues with the graphing. I stumbled across the msdn docs for GDI+ stating that "GDI+ functions and classes are not supported for use ...
Dynamically Rendering in a Scrollable Area
What is the generic algorithm or process that is commonly used to dynamically render portions of a scrolling area? For example, in Google Maps, when the user scrolls past the bounds of the currently rendered area, a grey checkerboard pattern is displayed within the not-yet-rendered portions while the application loads and renders those ...
What does the GDI+ background thread do?
Upon initialization, GDI+ (non .NET) creates a background thread, which can optionally be suppressed subject to calling some hook functions. MSDN, however, doesn't say what this thread actually does. Google doesn't seem to know either. What is it for? ...
How can I create an Image in GDI+ from a Base64-Encoded string in C++?
I have an application, currently written in C#, which can take a Base64-encoded string and turn it into an Image (a TIFF image in this case), and vice versa. In C# this is actually pretty simple. private byte[] ImageToByteArray(Image img) { MemoryStream ms = new MemoryStream(); img.Save(ms, System.Drawing.Imaging...
Layers with GDI+
I'm thinking of creating a drawing program with layers, and using GDI+ to display them. I want to use GDI+ because it supports transparency. The thing is, drawing lines to the DC is very fast, but drawing directly to a bitmap is very slow. It is only fast if you lock the bits and start setting pixels. Can I draw to multiple DC's in my W...
Having trouble compiling with GDI+ (VC++ 2008)
I just simply include gdiplus.h and get all these errors: Warning 32 warning C4229: anachronism used : modifiers on data are ignored c:\program files\microsoft sdks\windows\v7.0\include\gdiplusflat.h 1133 Warning 38 warning C4229: anachronism used : modifiers on data are ignored c:\program files\microsoft sdks\windows\v7.0\include\gd...
Optimizing GDI+ drawing?
I'm using C++ and GDI+ I'm going to be making a vector drawing application and want to use GDI+ for the drawing. I'v created a simple test to get familiar with it: case WM_PAINT: GetCursorPos(&mouse); GetClientRect(hWnd,&rct); hdc = BeginPaint(hWnd, &ps); MemDC = CreateCompatibleDC(hdc); bmp = C...
Why would GDI+ colours vary based off whether a tooltip is visible?
I'm displaying a bitmap using GDI+. After loading the bitmap from a DLL resource I set the background colour (blue - #0000FF) to transparent using TransparentBlt. On Windows Vista and later this works as expected. However, on a Windows XP system we're testing on this only works when any tooltip (e.g. the "title" property in IE, or Win...
I have having trouble with my c# gdi code
Hello, I have been trying to create a generic list of graphic objects. the code works fine for the first object but all subsequent objects are not working properly. I have included an image to show the desired effect. any help would be appreciated public partial class Form1 : Form { private GraphicList graphicCollection = new Graph...
Can we use png instead bitmap in GDI for bitblt ?
HDC hdcMem = CreateCompatibleDC(hdc); HBITMAP hbmOld = SelectObject(hdcMem, g_hbmBall); GetObject(g_hbmBall, sizeof(bm), &bm); BitBlt(hdc, 0, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY); I've found that many games use bitmap for displaying animation . But can we use png instead ? Because bitmap is quite big when i convert fron ...
How do you scale a CBitmap object?
I've loaded a CBitmap object from a resource ID, and I'm now wanting to scale it to 50% its size in each dimension. How might I go about this? ...
Setting the pixel format of an existing Bitmap in GDI+
How do I set the PixelFormat property in a GDI+ Bitmap if I can't use one of the constructors that allow me to specify it? It looks like the PixelFormat property itself is read-only. ...
How to implement Chord function using GDIplus?
Here are the GDI functions Chord() provided by MFC: BOOL Chord( int x1, int y1, int x2, int y2, int x3, int y3, int x4, int y4 ); BOOL Chord( LPCRECT lpRect, POINT ptStart, POINT ptEnd ); It seems to me that no such method is privided by GDI+ (the Graphics class), so how do I implement my own Chord function (with the exact same proto...
How does GDI+ support floating point values?
Given that GDI+ is a wrapper around GDI, how does it handle floating point values? I don't see any support for floating point co-ordinates in the GDI documentation. ...