Win32 draw line

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Might not be the most efficient drawing algorithm, but you're now in complete control of dot spacing as well. I went with this approach because there were other non-native pen styles I was using for line rendering which used a bit pattern. I then walked the bit and used setpixel for the 'on' bits.

It worked well and increased the useful linestyles.

win32 draw line

A pen width of zero causes GDI to always make the pen one pixel wide, regardless of the scaling associated with the device context. This may be enough to get the dots you want.

Learn more. WinAPI - how to draw dotted line? Ask Question. Asked 11 years, 8 months ago. Active 1 year, 11 months ago. Viewed 7k times.

In fact drawn line is dashed. How to draw dotten line using WinAPI? Active Oldest Votes.

win32 draw line

I too had this problem in the past. I resorted to using LineDDA and a callback proc. DavidK DavidK 3, 1 1 gold badge 16 16 silver badges 25 25 bronze badges.

win32 draw line

Drat, I hoped that that would be a quick fix. I suspect you'll need to go with SAMills answer, in that case. Kalles Fraktaler Kalles Fraktaler 1. Sign up or log in Sign up using Google. Sign up using Facebook.Shop now.

Created by Atari, Asteroids was one of the first vector graphics games, which means that it relied solely on lines to draw graphics, as opposed to little square pixels. Asteroids demonstrated that a very simple concept, with even simpler graphics and a soundtrack that gradually builds tension, creates a mix for success.

A computer game consists of many different pieces, all of which must come together to form a unique entertainment experience for the player.

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By far, the most important pieces of any game are the graphics. Graphics are used to represent the characters and creatures in a game, as well as background worlds and other interesting objects that factor into the overall game design. Granted, games have certainly done well because of factors outside of graphics, such as game play and sound quality, but those games are very rare.

Besides, nowadays game players expect to see high-quality graphics just as we all expect to see high-quality visual effects in Hollywood movies. So, it's important to develop a solid understanding of graphics programming and how to use graphics wisely in your games. Before jumping into the details of how graphics work in Windows and how they are applied to games, it's important to establish some ground rules and gain an understanding of how computer graphics work in general.

More specifically, you need to have a solid grasp on what a graphics coordinate system is, as well as how color is represented in computer graphics.

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The next couple of sections provide you with this knowledge, which you'll put to practical use a little later in the chapter. All graphical computing systems use some sort of graphics coordinate system to specify how points are arranged in a window or on the screen. Graphics coordinate systems typically spell out the origin 0, 0 of the system, as well as the axes and directions of increasing value for each of the axes. If you're not a big math person, this simply means that a coordinate system describes how to pinpoint any location on the screen as an XY value.

The traditional mathematical coordinate system familiar to most of us is shown in Figure 3. Figure 3. Windows graphics relies on a similar coordinate system to specify how and where drawing operations take place. Because all drawing in Windows takes place within the confines of a window, the Windows coordinate system is applied relative to a particular window.

The Windows coordinate system has an origin that is located in the upper-left corner of the window, with positive X values increasing to the right and positive Y values increasing down.

All values in the Windows coordinate system are positive integers. When I talk about drawing graphics in a window, I'm actually referring to the client area of a window, which doesn't include the title bar, menus, scrollbars, and so on. In the case of games, you can think of the client area of the main game window as the game screen.We explain how to draw lines and ellipses, which we will make use of in future lessons.

The basis for drawing graphics in GDI is the notion of a device context, which is given here by the hdc. A device context object abstracts the notion of a drawing surface so that we can use the same drawing commands whether we are drawing to a monitor screen, a printer, or any other device. The variable, hdc, is a handle to a device context. The code above can be broken into two sections: drawing a line and drawing an ellipse. In the first section, we draw a line by using the Commands MoveToEx and LineTo to designate the start and end points, respectively.

In the second section, we draw an ellipse by making a call to the Arc function. The parameters,specify the upper-left hand corner of the bounding rectangle with the first two coordinatesand the lower-right hand corner with the last two coordinates The remaining zeros that are passed in are not important for drawing an ellipse, but will be used when we draw arcs.

Most of the remaining code is set-up code for the drawing routines. The calls to CreatePen set the drawing style, width, and color, respectively. However, the pen is not active until we select it into our device context by calling SelectObject.

Notice that when we call SelectObjectthe currently selected pen is returned and we store it in hOldPen so that we can restore it when we are done drawing.

When we are done drawing with our pens, we must always call DeleteObject on them, since CreatePen performs dynamic allocation. Computer Science. Web Programming.The Graphics object provides the DrawLine method, and the Pen object holds attributes of the line, such as color and width.

The address of the Pen object is passed as an argument to the DrawLine method. The following program, which draws a line from 0, 0 to, consists of three functions: WinMainWndProcand OnPaint. The OnPaint function receives a handle to a device context and passes that handle to a Graphics constructor.

The argument passed to the Pen constructor is a reference to a Color object. The four numbers passed to the color constructor represent the alpha, red, green, and blue components of the color.

The alpha component determines the transparency of the color; 0 is fully transparent and is fully opaque. The four numbers passed to the DrawLine method represent the starting point 0, 0 and the ending pointof the line. Note the call to GdiplusStartup in the WinMain function. GdiplusStartup fills that variable with a token that is later passed to the GdiplusShutdown function.

SDL C++ tutorial with Visual Studio (Draw Line) p1

The second parameter of the GdiplusStartup function is the address of a GdiplusStartupInput structure. The preceding code relies on the default GdiplusStartupInput constructor to set the structure members appropriately. Skip to main content. Contents Exit focus mode. Is this page helpful? Yes No. Any additional feedback? Skip Submit.Skip to main content. Contents Exit focus mode. Function Description BeginPaint Prepares a window for painting.

DrawAnimatedRects Draws a rectangle and animates it to indicate icon or window activity. DrawCaption Draws a window caption. DrawEdge Draws one or more edges of rectangle. DrawFocusRect Draws a rectangle in the style that indicates the rectangle has the focus. DrawFrameControl Draws a frame control.

DrawState Displays an image and applies a visual effect to indicate a state. EndPaint Marks the end of painting in a window. ExcludeUpdateRgn Prevents drawing within invalid areas of a window. GdiFlush Flushes the calling thread's current batch.

GdiGetBatchLimit Returns the maximum number of function calls that can be accumulated in the calling thread's current batch. GdiSetBatchLimit Sets the maximum number of function calls that can be accumulated in the calling thread's current batch. GetBkColor Returns the background color for a device context. GetBkMode Returns the background mix mode for a device context.

GetBoundsRect Gets the accumulated bounding rectangle for a device context. GetROP2 Gets the foreground mix mode of a device context. GetUpdateRect Gets the coordinates of the smallest rectangle that encloses the update region of a window.

GetUpdateRgn Gets the update region of a window. GetWindowDC Gets the device context for a window, including title bar, menus, and scroll bars. GetWindowRgn Gets a copy of the window region of a window. GetWindowRgnBox Gets the dimensions of the tightest bounding rectangle for the window region of a window.

Using a Pen to Draw Lines and Shapes

GrayString Draws gray text at a location. InvalidateRect Adds a rectangle to a window's update region. InvalidateRgn Invalidates the client area within a region. LockWindowUpdate Disables or enables drawing in a window.

OutputProc A callback function used with the GrayString function. It is used to draw a string. PaintDesktop Fills the clipping region in a device context with a pattern.

RedrawWindow Updates a region in a window's client area.

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SetBkColor Sets the background to a color value. SetBkMode Sets the background mix mode of a device context.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I want to draw lines on desktop.

I know that the drawing functions are available in GDI Learn more. Asked 8 years, 10 months ago. Active 3 years ago. Viewed 12k times. This is way more related to win32 and gdi than OpenCV. I suggest you tag it appropriately. On your OpenCV project you just need to add the appropriate library paths, headers and link with the right GDI libraries for it to work. There's no magic, really. I am not using Win32 APi. Are you having a problem doing so, or do you have an external requirement that forbids it?

You should never draw directly on the desktop. Like we all learned in kindergarten, if something is not yours, you shouldn't draw on it. The desktop is not yours; it belongs to Windows. Active Oldest Votes. The code below draws a blue rectangle on the desktop. A Mandelbrot fractal drawn directly on the desktop. What in the world is the Sleep 10 function call doing in there? Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.

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Win32: Drawing Lines and Ellipses with GDI

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