Pentagram: Difference between revisions

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 * [http://proofsfromthebook.com/2013/08/04/angle-sum-of-a-pentagram/ Angle sum of a pentagram]
 <br><br>
+=={{header|AutoHotkey}}==
+[[File:Pentagram Java.png|300px|thumb|right]]
+<lang AutoHotkey>
+#Include Gdip.ahk	; https://autohotkey.com/boards/viewtopic.php?f=6&t=6517
+Width :=A_ScreenWidth, Height := A_ScreenHeight
+Gui, 1: +E0x20 +Caption +E0x80000 +LastFound +AlwaysOnTop +ToolWindow +OwnDialogs
+Gui, 1: Show, NA
+hwnd1 := WinExist()
+OnExit, Exit
+If !pToken := Gdip_Startup()
+{
+	MsgBox, 48, gdiplus error!, Gdiplus failed to start.
+	. Please ensure you have gdiplus on your system
+	ExitApp
+}
+hbm := CreateDIBSection(Width, Height)
+hdc := CreateCompatibleDC()
+obm := SelectObject(hdc, hbm)
+G := Gdip_GraphicsFromHDC(hdc)
+Gdip_SetSmoothingMode(G, 4)
+pBrush 	:= Gdip_BrushCreateSolid(0xFF6495ED)
+pPen 	:= Gdip_CreatePen(0xff000000, 3)
+;---------------------------------
+LL := 165
+Cx := Floor(A_ScreenWidth/2)
+Cy := Floor(A_ScreenHeight/2)
+phi := 54
+;---------------------------------
+loop, 5
+{
+	theta := abs(180-144-phi)
+	p1x := Floor(Cx + LL * Cos(phi * 0.01745329252))
+	p1y := Floor(Cy + LL * Sin(phi * 0.01745329252))
+	p2x := Floor(Cx - LL * Cos(theta * 0.01745329252))
+	p2y := Floor(Cy - LL * Sin(theta * 0.01745329252))
+	phi+= 72
+	Gdip_FillPolygon(G, pBrush, p1x "," p1y "|" Cx "," Cy "|" p2x "," p2y)
+}
+loop, 5
+{
+	theta := abs(180-144-phi)
+	p1x := Floor(Cx + LL * Cos(phi * 0.01745329252))
+	p1y := Floor(Cy + LL * Sin(phi * 0.01745329252))
+	p2x := Floor(Cx - LL * Cos(theta * 0.01745329252))
+	p2y := Floor(Cy - LL * Sin(theta * 0.01745329252))
+	phi+= 72
+	Gdip_DrawLines(G, pPen, p1x "," p1y "|" p2x "," p2y ) ; "|" Cx "," Cy )
+}
+UpdateLayeredWindow(hwnd1, hdc, 0, 0, Width, Height)
+Gdip_DeleteBrush(pBrush)
+SelectObject(hdc, obm)
+DeleteObject(hbm)
+DeleteDC(hdc)
+Gdip_DeleteGraphics(G)
+return
+;----------------------------------------------------------------------
+Esc::
+Exit:
+Gdip_Shutdown(pToken)
+ExitApp
+Return</lang>
 =={{header|Haskell}}==