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Colour bars/Display: Difference between revisions
Added AutoHotkey example
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{{task}}
The task is to display a series of vertical color bars across the width of the display. The color bars should either use the system palette, or the sequence of colors: Black, Red, Green, Blue, Magenta, Cyan, Yellow, White.
=={{header|AutoHotkey}}==
{{libheader|GDI+}} (available at http://www.autohotkey.net/~tic/Gdip.ahk)
<lang AutoHotkey>#SingleInstance, Force
#NoEnv
SetBatchLines, -1
; Uncomment if Gdip.ahk is not in your standard library
;#Include, Gdip.ahk
; Start gdi+
If !pToken := Gdip_Startup()
{
MsgBox, 48, gdiplus error!, Gdiplus failed to start. Please ensure you have gdiplus on your system
ExitApp
}
OnExit, Exit
; Set the width and height we want as our drawing area, to draw everything in. This will be the dimensions of our bitmap
Width := A_ScreenWidth, Height := A_ScreenHeight
; Create a layered window (+E0x80000 : must be used for UpdateLayeredWindow to work!) that is always on top (+AlwaysOnTop), has no taskbar entry or caption
Gui, 1: -Caption +E0x80000 +LastFound +OwnDialogs +Owner +AlwaysOnTop
; Show the window
Gui, 1: Show, NA
; Get a handle to this window we have created in order to update it later
hwnd1 := WinExist()
; Create a gdi bitmap with width and height of what we are going to draw into it. This is the entire drawing area for everything
hbm := CreateDIBSection(Width, Height)
; Get a device context compatible with the screen
hdc := CreateCompatibleDC()
; Select the bitmap into the device context
obm := SelectObject(hdc, hbm)
; Get a pointer to the graphics of the bitmap, for use with drawing functions
G := Gdip_GraphicsFromHDC(hdc)
Colors := "0xFF000000,0xFFFF0000,0xFF00FF00,0xFF0000FF,0xFFFF00FF,0xFF00FFFF,0xFFFFFF00,0xFFFFFFFF" ; ARGB = Transparency, Red, Green, Blue
; This list ^ is Black, Red, Green, Blue, Magenta, Cyan, Yellow, White
StringSplit Colors, Colors, `,
w := Width // Colors0
Loop % Colors0
{
; Create a brush to draw a rectangle
pBrush := Gdip_BrushCreateSolid(Colors%A_Index%)
; Fill the graphics of the bitmap with a rectangle using the brush created
Gdip_FillRectangle(G, pBrush, w*(A_Index-1), 0, w, height)
; Delete the brush as it is no longer needed and wastes memory
Gdip_DeleteBrush(pBrush)
}
; Update the specified window we have created (hwnd1) with a handle to our bitmap (hdc), specifying the x,y,w,h we want it positioned on our screen
; So this will position our gui at (0,0) with the Width and Height specified earlier
UpdateLayeredWindow(hwnd1, hdc, 0, 0, Width, Height)
; Select the object back into the hdc
SelectObject(hdc, obm)
; Now the bitmap may be deleted
DeleteObject(hbm)
; Also the device context related to the bitmap may be deleted
DeleteDC(hdc)
; The graphics may now be deleted
Gdip_DeleteGraphics(G)
Return
;#######################################################################
GuiEscape:
Exit:
; gdi+ may now be shutdown on exiting the program
Gdip_Shutdown(pToken)
ExitApp
Return</lang>
=={{header|Icon}} and {{header|Unicon}}==
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