I have 4 CToolbars in MyCFrame. They are docked on MyCFrame. How can I calculate free CFrame client area? I need to find some CRect with value (CFrameClientRect without size of docked bars).
From seeing your snapshot I conclude you are using some windows displaying image.
Get this windows rectangle: call GetWindowRectangle(ptrToRect)
and convert it to frame window’s client coordinates, passing rect as follows:
pMyFrame->ScreenToClient(ptrToRect)
Related
I am trying to get the color of a pixel on my screen using node.js. I want it to be returned in RGB format, e.g. (255, 0, 0). My current solution is to use screenshot-desktop to screenshot my entire screen in JPG format, decode it to get the raw pixel data, and get the color of a given pixel. However, this lags out my entire computer for 1-2 seconds as it is taking the screenshot. This is unusable as I would like to do this multiple times per second. So my question is: How can I get the color of a given pixel on the screen, without taking a full screenshot?
I am using Linux with X11. There is an X11 library for node.js, so I asssume I should use that to get the pixel color, I'm just not sure how. If you could show me how to do it in C then I can easily use node.js to do the same thing.
Thanks!
Oh my gosh I just figured it out after posting this. I was using robotjs for reading the mouse position and I totally forgot it can do screen stuff too! So, the solution would be to do
var robot = require('robotjs');
var color = robot.getPixelColor(x, y);
X11 solution using x11 node library ( I am the author ):
query windows tree with QueryTree starting at the root window
get every child geometry using GetGeometry request
if your point is not inside any child, use current window id and get 1x1 pixmap from the current image: GetImage(format, currentWindow, x, y, 1, 1, planeMask) ( 2 for format and 0xffffffff for plane mask should work ). Make sure you calculate relative x y position as you travers windows tree.
if child window covers your point query children for that window and repeat again. Note that QueryTree returns windows in bottom to top stacking order so make sure you pick last one covering your point
Once you have 1x1 pixmap from the topmost window under your point - the buffer should contain only color bytes for your image, RGB order and bit mask might depend on red_mask, green_mask, blue_mask from display.screen[0].depths[visual].
If you cache "topmost window" between requests and only start from root when no match anymore the above solution might be much more performant then the one using robotjs ( although much more low level and complicated ) Good luck!
We have an application that draws a colored border around specific application windows and dialogs.
We use GetWindowRect to get the rectangle of an application window. But on Windows 10 this function includes the shadowing border resulting in a large gap between our colored border and the application window. So we need to compensate for the shadowing border.
Which API can we use to determine the width of the shadowing border around application windows and dialogs in Windows 10?
I found the solution. Use DwmGetWindowAttribute with DWMWA_EXTENDED_FRAME_BOUNDS to get the correct size:
DwmGetWindowAttribute(hWnd, DWMWA_EXTENDED_FRAME_BOUNDS, &rect, sizeof(rect));
I have a chart show info of apps, but when run it on devices android. The position of text on chart not consistently.
These images illustrate the problem: https://drive.google.com/folderview?id=0B7-CxJHQ5ZnjYjVlTlFQdElWRGM&usp=sharing
I use TextLabelWidget in AndroidPlot. How to keep position of TextLabelWidget on chart with the same image1 in link above on devices?
The problem appears to be that your plot area is set to fill the width of the screen and since the bars are evenly distributed in that space, their x positions are essentially fractions of the screen width.
At the same time you have labels that appear to be positioned using absolute positioning. As an example, this code will position 4 labels at 0%, 25%, 50% and 75% screen width, 80 pixels down from the top of the screen:
txtWidget1.position(0, XLayoutStyle.RELATIVE_TO_LEFT, PixelUtils.dpToPix(80), YLayoutStyle.ABSOLUTE_FROM_TOP, AnchorPosition.LEFT_TOP);
txtWidget2.position(0.25f, XLayoutStyle.RELATIVE_TO_LEFT, PixelUtils.dpToPix(80), YLayoutStyle.ABSOLUTE_FROM_TOP, AnchorPosition.LEFT_TOP);
txtWidget3.position(0.50f, XLayoutStyle.RELATIVE_TO_LEFT, PixelUtils.dpToPix(80), YLayoutStyle.ABSOLUTE_FROM_TOP, AnchorPosition.LEFT_TOP);
txtWidget4.position(0.75f, XLayoutStyle.RELATIVE_TO_LEFT, PixelUtils.dpToPix(80), YLayoutStyle.ABSOLUTE_FROM_TOP, AnchorPosition.LEFT_TOP);
There are some other factors that you are also probably going to need to deal with such as bar width but this should get you closer. You may find this doc useful as far as a guide for the different positioning methods.
Another tool to consider using if you aren't using it already is the Configurator. This will let you set your positions etc. inside xml and override values based on screen size, orientation, etc.
I have a question in corona sdk. I need to fade top part of an object (like 60px of 250px) when moving the object to top before it goes out of the screen.
In another word, I need to set a display area for an image or object which its height is more than screen height. Like a top padding space which image will be faded when moving out of the display area (not the screen area)
Any tutorial or suggestion?
Sounds like image masks are exactly what you need.
In your case you would need to set the mask when moving the object to top, unset it when it comes back.
You can check the documentation for masks here:
http://docs.coronalabs.com/guide/media/imageMask/index.html
I have an image of size 480x800 pixels and there is a icon on one corner which I need to place. What I want is that to ignore all touches on the transparent areas and detect only the area where the icon is.
I found a solution in SO to this problem but it just tells the code to be used. I need to know exactly where to put that code since I am a beginner and don't know much about cocos2d so I expect a step by step solution.
Cocos2d 2.0 - Ignoring touches to transparent areas of layers/sprites
Do not use glReadPixels because it affected by bugs in android drivers. You can translate CCTouch to CCPoint in image coordinates using convertTouchToNodeSpace, and read image pixel at given point.
Create CCImage from file that contains semi-transparent picture, and read one pixel at tap point; it should be {0,0,0,0} for transparent area.
Don't forget to check that tap is not outside picture, and create pixel index in CCImage::getData() array with formulae unsigned index = x * imageWidth + y.