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1. #Win32 transparent rectangle update
2. #Win32 transparent rectangle code
3. #Win32 transparent rectangle free
4. #Win32 transparent rectangle windows

#bind this mouse callback function to OpenCV windowĬv2.setMouseCallback('image',draw_circle) If you use OpenCV then it can be done like this #draw either rectangles or circles by dragging the mouse like we do in Paint applicationĭrawing = False # true if mouse is pressed Hopefully this saves some people from searching before finding a good example.

#Win32 transparent rectangle update

The only reference I could find on the "clearing the old drawings" was this post: win32 content changed but doesn't show update unless window is moved tagged c++ win winapi. This causes the positioning issue to go away, perhaps take this to account by querying the OS for the scale and compensate.

#Win32 transparent rectangle windows

Or changing the Windows display scale to 100%: And I haven't found many ways around this other than going over to a OpenGL solution or using frameworks such as wxPython or OpenCV other than this post: Marking Your Python Program as High DPI Aware Seamlessly Windows Issues with positions and resolution? Be aware that high DPI systems tend to cause a bunch of issues. Win32gui.RedrawWindow(hwnd, past_coordinates, rect, win32con.RDW_INVALIDATE) Rect = win32gui.CreateRoundRectRgn(*past_coordinates, 2, 2) import win32gui, win32ui, win32api, win32con

#Win32 transparent rectangle code

An example to this is, hide the desktop icons and the below code won't work. But I haven't found a way more agressive than RedrawWindow, even tho that is still quite gentle.

#Win32 transparent rectangle free

InvalidateRect is a bit nicer on performance as it asks the event handler to clear the rect when there's free time to do so. Or for more control, even use win32gui.PatBltĪnd apparently setPixel is the fastest, so here's my final example with color and speed, altho it's not perfect as the RedrawWindow doesn't force a redraw, it simply asks windows to do it, then it's up to windows to honor it or not. But this is the basic concept :)Īnd to create a rectangle without the infill, you could swap Rectangle for DrawFocusRect for instance. Win32gui.InvalidateRect(hwnd, monitor, True) # Refresh the entire monitorįurther optimizations could be done here, like not update the entire monitor, only the parts where you've drawn on and so on. You'll need to invalidate the entire region of your monitor in order to tell windows to re-draw anything on it (or so I understand it).Īnd to overcome the slowness, instead of using for loops to create the boundary which will take X cycles to iterate over before completing the rectangle, you could use win32ui.Rectangle to draw it in one go: import win32gui, win32ui In order to refresh the old drawn area, you need to either call win32gui.UpdateWindow or something similar to update your specific window, but since you're not technically drawing on a surface, but the entire monitor. Not difficult to improve it to accept any secondary position. This will only work if you remain bellow and to the right from your initial position, but it is just what I needed. The division and multiplication by four is necessary to avoid flickering, but is visually the same as using DrawFocusRect. Win32gui.InvalidateRect(hwnd, (m, m, GetSystemMetrics(0), GetSystemMetrics(1)), True)

At the end, the code that worked the best for me is: import win32gui The first solution renders quite clean, while the second remains a little glitchy. However, I found that setting only the color of the points I need to be set is cheaper than asking for a rectangle.

Is there an easy way to update the screen faster to prevent this?Īs suggested by using win32gui.InvalidateRect solved the updating problem. The only solution I've came with is to take the pixel values i will paint before set them black, and redraw them every time, but this makes my code pretty slow. I came with this code: import win32guiĪs you can see, the code will draw the rectangle, but the previous ones will remain until the screen updates. I am not an expert and I am trying to show a rectangle on screen which follows mouse movements from a settle starting point, just as when you select something in word or paint.