Hello,
A happy new year to all!
I was wondering if there was some kind of way to select a null brush of some kind that simply draws nothing instead of some color. The same like in the CreatePen function we are able to select an option PS_NULL to make the borders of a shape invisible.
I am asking this because I wrote a small program with waves (download in zip). one spawning in the left upper corner and one in the bottom right corner of the screen. if they touch each other i still want both waves to be visible instead of them overlapping. (it will be clear if you take a look at the program).
Does anyone know how to ?
Thanks in advance
Jannes
when you register the window class, use WNDCLASSEX.hbrBackground = NULL
or, if you need a brush handle (type HBRUSH)...
INVOKE GetStockObject,NULL_BRUSH
mov hbrNull,eaxHOLLOW_BRUSH is the same thing
QuoteIt is not necessary (but it is not harmful) to delete stock objects by calling DeleteObject.
Thanks! I had not heard of the getStockObject function.
a little document i use to as reference...
;************************************************************************************************
;WNDCLASSEX Background Brush Colors
;---------------------------------------
;Created Brush Colors
;---------------------------------------
;Stock Object Brush Colors
;
; Stock objects also exist that may be used for a few "standardized" brush colors.
;Handles to stock objects need not be destroyed, however there is no harm in doing so.
;There are numerous other stock objects that are not brushes.
;
;GetStockObject brush colors
;
;WHITE_BRUSH EQU 0
;LTGRAY_BRUSH EQU 1
;GRAY_BRUSH EQU 2
;DKGRAY_BRUSH EQU 3
;BLACK_BRUSH EQU 4
;NULL_BRUSH EQU 5
;
;Stock Object Color Alias
;
;HOLLOW_BRUSH EQU NULL_BRUSH
;---------------------------------------
;WNDCLASSEX System Colors
;
; To use a system color in class registration, add one to the
;system color value to derive the WNDCLASSEX.hbrBackground value.
;Only the first 19 system colors (0-18) are allowed for WNDCLASSEX.
;NULL is also acceptable, which indicates that the caller must erase the background.
;NULL is, therefore, equivalent to using GetStockObject(NULL_BRUSH).
;
;COLOR_SCROLLBAR EQU 0
;COLOR_BACKGROUND EQU 1
;COLOR_ACTIVECAPTION EQU 2
;COLOR_INACTIVECAPTION EQU 3
;COLOR_MENU EQU 4
;COLOR_WINDOW EQU 5
;COLOR_WINDOWFRAME EQU 6
;COLOR_MENUTEXT EQU 7
;COLOR_WINDOWTEXT EQU 8
;COLOR_CAPTIONTEXT EQU 9
;COLOR_ACTIVEBORDER EQU 10
;COLOR_INACTIVEBORDER EQU 11
;COLOR_APPWORKSPACE EQU 12
;COLOR_HIGHLIGHT EQU 13
;COLOR_HIGHLIGHTTEXT EQU 14
;COLOR_BTNFACE EQU 15
;COLOR_BTNSHADOW EQU 16
;COLOR_GRAYTEXT EQU 17
;COLOR_BTNTEXT EQU 18
;
;WNDCLASSEX System Color Aliases
;
;COLOR_DESKTOP EQU COLOR_BACKGROUND ;1
;COLOR_3DFACE EQU COLOR_BTNFACE ;15
;COLOR_3DSHADOW EQU COLOR_BTNSHADOW ;16
;---------------------------------------
;Additional System Colors
;
; Additional system colors are defined that may not be directly used in WNDCLASSEX.
;A handle for these objects may be obtained by using CreateSolidBrush(GetSysColor(nIndex)).
;Handles obtained in this manner should be destroyed when you are done using them.
;
; A handle to these brushes may also be obtained by using GetSysColorBrush(nIndex).
;The documentation states that these handles should not be used in class registration,
;but they may be used in a WM_PAINT handler and should not be destroyed.
;
;COLOR_INACTIVECAPTIONTEXT EQU 19
;COLOR_BTNHIGHLIGHT EQU 20
;COLOR_3DDKSHADOW EQU 21
;COLOR_3DLIGHT EQU 22
;COLOR_INFOTEXT EQU 23 ;tooltip text
;COLOR_INFOBK EQU 24 ;tooltip background
; ;wonder what happened to 25 ;)
;COLOR_HOTLIGHT EQU 26
;COLOR_GRADIENTACTIVECAPTION EQU 27
;COLOR_GRADIENTINACTIVECAPTION EQU 28
;COLOR_MENUHILIGHT EQU 29 ;not supported under Win 2000
;COLOR_MENUBAR EQU 30 ;not supported under Win 2000
;
;Additional System Color Aliases
;
;COLOR_3DHIGHLIGHT EQU COLOR_BTNHIGHLIGHT ;20
;COLOR_3DHILIGHT EQU COLOR_BTNHIGHLIGHT ;20
;COLOR_BTNHILIGHT EQU COLOR_BTNHIGHLIGHT ;20
;************************************************************************************************
I think that this is a common place.