How to get the total number of pixels of a window? | Forex Factory

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How to get the total number of pixels of a window?

  • #1
  • First Post: Sep 2, 2009 7:06pm Sep 2, 2009 7:06pm
Hi,
I need to place some lable in proportion to the total number of pixels of x-axis and y-axis of the window. But how can I get the total number of pixels?
Cheers.
xecret
  • #2
  • Sep 2, 2009 8:12pm Sep 2, 2009 8:12pm
Like:
int WindowBarsPerChart()Function returns the amount of bars visible on the chart.
Sample:
// work with visible bars.int bars_count=WindowBarsPerChart();int bar=WindowFirstVisibleBar();for(int i=0; i<bars_count; i++,bar--) { // ... }... etc ... might not give pixel count, but can probably be used to place your objects
  • #3
  • Sep 3, 2009 12:35am Sep 3, 2009 12:35am
Quoting Kenz987
Like:
int WindowBarsPerChart()Function returns the amount of bars visible on the chart.
Sample:
// work with visible bars.int bars_count=WindowBarsPerChart();int bar=WindowFirstVisibleBar();for(int i=0; i<bars_count; i++,bar--) { // ... }... etc ... might not give pixel count, but can probably be used to place your objects
It's not difficult to get the price range and bar range, but what I need is the exact pixel range, especially for the y-axis. Thanks for the help anyway.
  • #4
  • Edited 1:52am Sep 3, 2009 12:46am | Edited 1:52am
Quoting xecret
how can I get the total number of pixels?
WinAPI call GetWindowRect() does what you need.

#import "user32.dll"
int GetWindowRect(int hWnd, int rect[4]);
#import

...
int r[4];

GetWindowRect(WindowHandle(Symbol(), Period()), r);
  • #5
  • Sep 3, 2009 1:13am Sep 3, 2009 1:13am
Quoting Irtron
WinAPI call GetWindowRect() does what you need.

#import "user32.dll"
int GetWindowRect(int hWnd, int rect[4]);
#import

...
int r[4];

GetWindowRect(WindowHandle(NULL, 0), r);
Thanks a lot. But I got nothing. Need further help.

Inserted Code
#property indicator_chart_window
#import "user32.dll"
int GetWindowRect(int hWnd, int rect[4]); 
#import
int init()   {return(0);}
int deinit() {return(0);}
int start(){
   int r[4];
   GetWindowRect(WindowHandle(NULL, 0), r);
   Comment(r[0],"  ",r[1],"  ",r[2],"  ",r[3],"  ",r[4]);
   return(0);
}

http://clip2net.com/clip/m14233/thum...-clip-12kb.png
  • #6
  • Sep 3, 2009 1:50am Sep 3, 2009 1:50am
My bad, sorry.

WindowHandle() doesn't take default parameters.

Use WindowHandle(Symbol(), Period()) instead.
  • #7
  • Sep 3, 2009 1:58am Sep 3, 2009 1:58am
btw, please remove ', " ", r[4]' from Comment() call. There is no item #4 in four element array.
  • #8
  • Sep 3, 2009 3:00am Sep 3, 2009 3:00am
Quoting Irtron
My bad, sorry.

WindowHandle() doesn't take default parameters.

Use WindowHandle(Symbol(), Period()) instead.
Great! You are really an expert!
See the below pic. With this function, range X1 and Y1 can be calculated. However, what I need is Y2. Is there a way to go?
Thank you very much.

http://clip2net.com/clip/m14233/thum...-clip-14kb.png
  • #9
  • Sep 3, 2009 6:21am Sep 3, 2009 6:21am
Quoting xecret
See the below pic. With this function, range X1 and Y1 can be calculated. However, what I need is Y2. Is there a way to go?
There is no a straightforward one I'm afraid.
The heights of chart subwindows are stored in profile chart files *.chr and templates *.tpl. The problem is that if the height is adjusted in the terminal the change doesn't get applied to the file until the terminal exits.

Although there are some other approaches to consider.
Retrieving the value from the terminal process memory is quite possible but rather tricky.
Another way is to use WinAPI GetPixel call to pick the actual pixels on the left boundary line from the bottom of the chart and count them until the gap between the subwindows is encountered.
  • #10
  • Sep 3, 2009 6:49am Sep 3, 2009 6:49am
Quoting Irtron
There is no a straightforward one I'm afraid.
The heights of chart subwindows are stored in profile chart files *.chr and templates *.tpl. The problem is that if the height is adjusted in the terminal the change doesn't get applied to the file until the terminal exits.

Although there are some other approaches to consider.
Retrieving the value from the terminal process memory is quite possible but rather tricky.
Another way is to use WinAPI GetPixel call to pick the actual pixels on the left boundary line from the bottom of the chart and count...
Thanks for the hints. Too compicated for me, I think I'd better give up.
  • #11
  • Sep 3, 2009 8:17am Sep 3, 2009 8:17am
API. Great idea. The sub-window is window 2. Maybe the same logic will work if you get the handle to sub-2..??
  • #12
  • Sep 3, 2009 5:35pm Sep 3, 2009 5:35pm
Quoting Kenz987
API. Great idea. The sub-window is window 2. Maybe the same logic will work if you get the handle to sub-2..??
I tried using "GetWindowRect(WindowHandle(Symbol(), Period())-2, r)" and got nothing. I think the main chart window and the indicator subwindows are treated as one whole object by Windows OS. I guess it is impossible to get the subwindow size calling external functions unless using some visual recognition technique.
Thanks.
  • #13
  • Sep 3, 2009 8:12pm Sep 3, 2009 8:12pm
Can you tell us what you are trying to do? How are you going to place these labels on the sub-window - with ObjectCreate? It takes a time and price (or indicator % - I guess). So to get the top most limit you just loop thru the price index incrementing it until you get an error - that's as high as you can go like for RSI it would be 100. Likewise downward, if the scale is below 0.
  • #14
  • Sep 3, 2009 9:31pm Sep 3, 2009 9:31pm
I wrote and MTF indicator showing information in some small squares. The subwindow is limited from 0 to 100. Each line is of one timeframe. I need a lable for each line. The squares are output using buffers at a predefined level. Let's name this level as Line_ht. The lable on the right is created by ObjectCreate(lable_name, OBJ_TEXT, ...). I set the level of the lable using ObjectSet(lable_name,OBJPROP_PRICE1,Line_ht+yShift). I put an offset yShift=10 otherwise the lable will be a little lower than the squares.
It's OK when I have small windows. But if I maximize the window, the lable and the squares do not line up any longer. Some lable is even missing. I just want to solve this problem. The lable lines up with a level, no matter how you adjust the window size.
I hope I described clear. Thanks.
Attached Image(s) (click to enlarge)
Click to Enlarge Name: align1.png Size: 45 KB
Click to Enlarge Name: align2.png Size: 23 KB
  • #15
  • Edited 5:01am Sep 4, 2009 4:25am | Edited 5:01am
Quoting xecret
I wrote and MTF indicator showing information in some small squares. The subwindow is limited from...
Hullo xecret,

I wanted to do exactly the same thing, and used the same solution that you have. Just now, reading the MQ4 documentation (as you do..), there is an example of code under WindowPriceMax, where a rectangle is drawn in a subwindow with ObjectCreate, using WindowPriceMax to set the upper limit to get the top boundary of the box. If this is possible, then a percentage (say line_ht %) of WindowPriceMax might give a value of the height of the line of squares, suitable to use with ObjectSet.............. Maybe......... What do you think?

http://docs.mql4.com/windows/WindowPriceMax

PS. I like your programming, it is very clean, like Chinese calligraphy, especially compared to mine, which is full of rumpled paper, ink smudges and crossings out, like a small schoolboy's exercise book, .
PPS. The example places the rectangle in the Main Window, but ObjectCreate and WindowPriceMax have a parameter for placing the rectangle in a subwindow also using the same values
  • #16
  • Sep 4, 2009 1:51pm Sep 4, 2009 1:51pm
To test:
Open a chart, place a RSI on chart, set a level at 100% yellow, do not set any more levels.
Run this SCRIPT.
It finds the yellow line relative to the client area (ie your screen area).
So, in your app, get the highest price and place a yellow line there with create object.
Attached File(s)
File Type: mq4 zTestWinRect.mq4   2 KB | 623 downloads
  • #17
  • Sep 4, 2009 10:07pm Sep 4, 2009 10:07pm
Quoting Royston
Hullo xecret,

I wanted to do exactly the same thing, and used the same solution that you have. Just now, reading the MQ4 documentation (as you do..), there is an example of code under WindowPriceMax, where a rectangle is drawn in a subwindow with ObjectCreate, using WindowPriceMax to set the upper limit to get the top boundary of the box. If this is possible, then a percentage (say line_ht %) of WindowPriceMax might give a value of the height of the line of squares, suitable to use with ObjectSet.............. Maybe......... What do you think?...
In the indicator the max and min prices are already limited as 100 and 0, so there is no need to use WindowPriceMax or WindowPriceMin. What I needed to know is "price per pixel". Price range in fact is 100-0=100, so the remaining work is to find the pixel number.
Your indicator is also very good. It's very clean. A lot of people like it better than mine. Mine looks a bit complecated.
  • #18
  • Sep 4, 2009 10:19pm Sep 4, 2009 10:19pm
Quoting Kenz987
To test:
Open a chart, place a RSI on chart, set a level at 100% yellow, do not set any more levels.
Run this SCRIPT.
It finds the yellow line relative to the client area (ie your screen area).
So, in your app, get the highest price and place a yellow line there with create object.
Brilliant!
I followed your method and it is working! Thank you veryyyy much.
Quoting Irtron
Another way is to use WinAPI GetPixel call to pick the actual pixels on the left boundary line from the bottom of the chart and count them until the gap between the subwindows is encountered.
Can we follow Irtron's idea without place a yellow line, just to recognize the gap? The thing is how we can get the foreground and background color of the window.
  • #19
  • Sep 4, 2009 10:49pm Sep 4, 2009 10:49pm
I tried to get the white line on the border, but could not do it. Even on the yellow line, it finds x = 6 first, don't know why the first 5 are missed. Maybe there's something I missed. You now have something to work with.
  • #20
  • Sep 5, 2009 1:07am Sep 5, 2009 1:07am
There are some pixels on the left to the beggining of the yellow line. So 6 is correcrect position of the first yellow pixel.
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