How does pixelsearch work?

[Bamse]

Can someone explain how the pixelsearch works with left,top,right and bottom. 
Please use an image to explain it with.

[Jos]

Which part from the helpfile is unclear for you?

Jos

[careca]

Trying to answer the OP question i came up with a question myself..

the remarks in the pixelsearch func say:

The search direction varies as follows:
    Left-to-Right - left < right
    Right-to-Left - right < left
    Top-to-Bottom - top < bottom
    Bottom-to-Top - bottom < top
Changing the search direction can be a useful optimization if the color being searched for frequently appears in in a specific quadrat of the search area since less searching is done if the search starts in the most common quadrant.

My doubt is, how can i change the direction of the search? i don't see any parameter to define that, is it auto? I assume it is, and that should answer the OP.

[Jos]

OK lets see you can figure this out by studying left-right as an example

Quote

 Left-to-Right - left < right
 Right-to-Left - right < left

So what exactly does this say ?

Jos

[PunkoHead]

Hi again,

This example actually shows everything for it.

As my example script I will show you what it does.

I will open this webpage in the browser and will leave my SCITE windows on the right of it.

On the webpage, I want it to move my cursor on the Facebook button. So what I will do first is start autoit window info and get the rectangle position.

In order to do so:

1. Move the pointer to the top left of the button and check the X result - in my case 445 - this will be your left for the function
2. The top will be the Y result - in my case 754
3. Now move the pointer to the bottom right of the button and check the X result - in my case 527 - this will be your right for the function
4. The bottom will be the Y result - in my case 787

To find the color, use the same program (autoit window info) and move the pointer to the color itself. I got result - 0x428BCA

And now the function:

;~ Search for color 0x428BCA between these coords:
$result = PixelSearch(445, 754, 527, 787, 0x428BCA)
;~ Move the mouse to the coords of the found color:
MouseMove($result[0], $result[1])

 

[careca]

@PunkoHead: I think the op knows how it works, seems he asked specifically the way it works

@Jos: Ah! you are of course correct, i overlooked the '<'

I just need to switch the values to search in the other direction.

So in order to search from left to right i need to set the left value as the smaller one, and the right as the bigger.

And in searching from right to left, the opposite, is that it?

Edited January 8, 2018 by careca

[Somerset]

27 minutes ago, Jos said:

Which part from the helpfile is unclear for you?

Jos

There is a help file?

[Bamse]

The specific thing that i am having problems with is that i don’t really understand how it is searching for the pixels. I don’t get how left,top,bottom and right is working.
That's why i am asking one of you too draw a square and point out where left,top,bottom and right is I think that would help out!  

[Jos]

Just now, Bamse said:

That's why i am asking one of you too draw a square and point out where left,top,bottom and right is I think that would help out!  

Why draw something when it is described?
So did you actually look at the description in the helfile .... and .... also read this whole thread as it has more info in it now about your question?

Jos

[Bamse]

I understand everything else then left,top,right and bottom.
Yes i have been reading the help file.

Edited January 8, 2018 by Bamse

[Jos]

Just now, Bamse said:

Yes i have been reading the help file.

there where 2 parts in that last question.  

[Bamse]

I have read the whole thread.

[Jos]

So the helpfile description states:

Quote

The search direction varies as follows:
    Left-to-Right - left < right
    Right-to-Left - right < left
    Top-to-Bottom - top < bottom
    Bottom-to-Top - bottom < top

To translate the first line: It will scan from left-to-right when the Left parameter is smaller than the Right parameter. 
(I leave the rest for you to fill in)
Does that make it any clearer for you?

Jos
 

Edited January 8, 2018 by Jos

[careca]

10 minutes ago, Bamse said:

The specific thing that i am having problems with is that i don’t really understand how it is searching for the pixels. I don’t get how left,top,bottom and right is working.
 

In terms of coordinates, top left is zero. Meaning top = 0 left = 0 and bottom right is the max resolution, say you have a resolution of 800x600. right is 800 and bottom is 600.

So in a search from left to right , top to bottom, it starts from 0 to 800, onto de next line.. so all pixels in line 0 then all pixels in line 1 etc

Edited January 8, 2018 by careca

[Bamse]

I am getting an error and i don’t know why

WinActivate("Discord")
;~ Search for color 0x44D723 between these coords:
$pix = PixelSearch(967, 0, 1919, 39, 0x44D723)
;~ Move the mouse to the coords of the found color:
MouseMove($pix[0], $pix[1])

 

[Jos]

1 minute ago, Bamse said:

I am getting an error

.. and you want us to guess what that error is?

My guess would be that you haven't looked at the example in the Helpfile!!!!

Edited January 8, 2018 by Jos

[Bamse]

I am LOOKING AT THE EXAMPLE CODE!

[Bamse]

I am guessing that the error has todo with the coordinates.

[Jos]

So what is there YOU DO NOT HAVE USED? (guess you want to have a shouting match?)

Edited January 8, 2018 by Jos

[careca]

My guess is

Subscript used on non-accessible variable.:
MouseMove($pix[0], $pix[1])
MouseMove($pix^ ERROR

Because the script didnt find the pixel. Add some tolerance.

$pix = PixelSearch(967, 0, 1919, 39, 0x44D723, 10)