Circle Collision v2.0

#include <WindowsConstants.au3>
#include <GUIConstants.au3>
#include <GDIPlus.au3>
#include <WinAPI.au3>
#include <Misc.au3>

; - Author: name22 (www.autoit.de)

Opt("GUIOnEventMode", 1)

;###-v-SETTINGS-v-###

$iGUIWidth = 600
$iGUIHeight = 400
$iARGB_BG = 0xFFFFFFFF
$nFPS = 60

$nGravity = 0
$nAirFriction = 1
$nGroundFriction = 1
$nBounciness = 1

$iCircles = 10
$nSlowMotion = 10

;###-^-SETTINGS-^-###

$nSleepTime = 1000 / $nFPS

$nTimeMod = 1
$nFPS_Display = 0

$vNTdll = DllOpen("ntdll.dll")
$vUser32Dll = DllOpen("User32.dll")

$tPrecSleep = DllStructCreate("int64 time;")
$pPrecSleep = DllStructGetPtr($tPrecSleep)

$hMain = GUICreate("Physics Engine", $iGUIWidth, $iGUIHeight)
GUISetState()

$hDC_Main = _WinAPI_GetDC($hMain)
$hDC_Buffer = _WinAPI_CreateCompatibleDC($hDC_Main)
$hBitmap_Buffer = _WinAPI_CreateCompatibleBitmap($hDC_Main, $iGUIWidth, $iGUIHeight)
_WinAPI_SelectObject($hDC_Buffer, $hBitmap_Buffer)

_GDIPlus_Startup()

$hGraphics = _GDIPlus_GraphicsCreateFromHDC($hDC_Buffer)
_GDIPlus_GraphicsSetSmoothingMode($hGraphics, 2)

$hBrush_Black = _GDIPlus_BrushCreateSolid(0xFF000000)

$hStringFormat = _GDIPlus_StringFormatCreate()
$hFamily_FPS = _GDIPlus_FontFamilyCreate("Arial")
$hFont_FPS = _GDIPlus_FontCreate($hFamily_FPS, 6)
$hFont_Copyright = _GDIPlus_FontCreate($hFamily_FPS, 8)
$hFont_Number = _GDIPlus_FontCreate($hFamily_FPS, 10)

$aMeasure = _GDIPlus_GraphicsMeasureString($hGraphics, "FPS: 000", $hFont_FPS, _GDIPlus_RectFCreate(), $hStringFormat)
$tLayout_FPS = $aMeasure[0]
$aMeasure = ""
DllStructSetData($tLayout_FPS, "X", $iGUIWidth - DllStructGetData($tLayout_FPS, "Width") - 3)
DllStructSetData($tLayout_FPS, "Y", $iGUIHeight - DllStructGetData($tLayout_FPS, "Height"))
DllStructSetData($tLayout_FPS, "Width", 0)

$tLayout_Copyright = _GDIPlus_RectFCreate(0, $iGUIHeight - 15)

Global $aCircles[$iCircles + 1][6] = [[$iCircles]]

For $i = 1 To $aCircles[0][0]
    $aCircles[$i][4] = Random(10, 20, 1) ;Circle Radius/Mass
    $aCircles[$i][0] = Random($aCircles[$i][4], $iGUIWidth - $aCircles[$i][4], 1) ;X-Position of Circle Center
    $aCircles[$i][1] = Random($aCircles[$i][4], $iGUIHeight - $aCircles[$i][4], 1) ;Y-Position of Circle Center
    $aCircles[$i][2] = Random(-1, 1) ;X-Velocity
    $aCircles[$i][3] = Random(-1, 1) ;Y-Velocity
    $nRandomSpeed = Random(200, 400, 1) * - 1 ^ Random(1, 2, 1)
    $aCircles[$i][2] = $aCircles[$i][2] * $nRandomSpeed
    $aCircles[$i][3] = $aCircles[$i][3] * $nRandomSpeed
    $aCircles[$i][5] = _GDIPlus_BrushCreateSolid("0xFF" & Hex(Random(0x000000, 0xFFFFFF, 1), 6)) ;Brush
Next

GUISetOnEvent($GUI_EVENT_CLOSE, "_Close", $hMain)
OnAutoItExitRegister("_Shutdown")

$nT_Sleep = TimerInit() + $nSleepTime
$nT_UpdateFPS = TimerInit()
While True
    DllStructSetData($tPrecSleep, "time", -10000 * ($nSleepTime - TimerDiff($nT_Sleep)))
    DllCall($vNTdll, "dword", "ZwDelayExecution", "int", 0, "ptr", $pPrecSleep)
    $nFrameTime = TimerDiff($nT_Sleep)
    $nT_Sleep = TimerInit()

    $nFPS_Cur = 1000 / $nFrameTime
    If TimerDiff($nT_UpdateFPS) >= 500 Then
        $nFPS_Display = $nFPS_Cur
        $nT_UpdateFPS = TimerInit()
    EndIf

    Switch _IsPressed("20", $vUser32Dll)
        Case True
            $nTimeMod = $nSlowMotion
        Case False
            If $nTimeMod <> 1 Then $nTimeMod = 1
    EndSwitch

    $nFPS_Cur *= $nTimeMod

    _GDIPlus_GraphicsClear($hGraphics, $iARGB_BG)

    For $i1 = 1 To $aCircles[0][0]

        $aCircles[$i1][3] += $nGravity
        $aCircles[$i1][2] *= $nAirFriction
        $aCircles[$i1][3] *= $nAirFriction

        Switch True
            Case $aCircles[$i1][0] + $aCircles[$i1][2] / $nFPS_Cur <= $aCircles[$i1][4]
                $aCircles[$i1][2] *= -$nBounciness
                $aCircles[$i1][3] *= $nGroundFriction
                $aCircles[$i1][0] = $aCircles[$i1][4]
            Case $aCircles[$i1][0] + $aCircles[$i1][2] / $nFPS_Cur >= $iGUIWidth - $aCircles[$i1][4]
                $aCircles[$i1][2] *= -$nBounciness
                $aCircles[$i1][3] *= $nGroundFriction
                $aCircles[$i1][0] = $iGUIWidth - $aCircles[$i1][4]
        EndSwitch
        Switch True
            Case $aCircles[$i1][1] + $aCircles[$i1][3] / $nFPS_Cur <= $aCircles[$i1][4]
                $aCircles[$i1][3] *= -$nBounciness
                $aCircles[$i1][2] *= $nGroundFriction
                $aCircles[$i1][1] = $aCircles[$i1][4]
            Case $aCircles[$i1][1] + $aCircles[$i1][3] / $nFPS_Cur >= $iGUIHeight - $aCircles[$i1][4]
                $aCircles[$i1][3] *= -$nBounciness
                $aCircles[$i1][2] *= $nGroundFriction
                $aCircles[$i1][1] = $iGUIHeight - $aCircles[$i1][4]
        EndSwitch

        For $i2 = $i1 + 1 To $aCircles[0][0]
            $nX_V = ($aCircles[$i1][2] - $aCircles[$i2][2]) / $nFPS_Cur
            $nY_V = ($aCircles[$i1][3] - $aCircles[$i2][3]) / $nFPS_Cur
            $nL_V = Sqrt($nX_V ^ 2 + $nY_V ^ 2)

            $nX_N = $nX_V / $nL_V
            $nY_N = $nY_V / $nL_V

            $nX_C = $aCircles[$i2][0] - $aCircles[$i1][0]
            $nY_C = $aCircles[$i2][1] - $aCircles[$i1][1]
            $nL_C = Sqrt($nX_C ^ 2 + $nY_C ^ 2)

            Switch $nL_V > 0
                Case True
                    Switch $nL_C - ($aCircles[$i1][4] + $aCircles[$i2][4]) <= $nL_V
                        Case True
                            $nD = $nX_N * $nX_C + $nY_N * $nY_C
                            Switch $nD >= 0
                                Case True
                                    $nF = $nL_C ^ 2 - $nD ^ 2
                                    Switch $nF <= ($aCircles[$i1][4] + $aCircles[$i2][4]) ^ 2
                                        Case True
                                            $nDistance = $nD - Sqrt(($aCircles[$i1][4] + $aCircles[$i2][4]) ^ 2 - $nF)
                                            Switch $nDistance <= $nL_V
                                                Case True
                                                    $nQ = $nDistance / $nL_V

                                                    $aCircles[$i1][0] += $aCircles[$i1][2] / $nFPS_Cur * $nQ
                                                    $aCircles[$i1][1] += $aCircles[$i1][3] / $nFPS_Cur * $nQ
                                                    $aCircles[$i2][0] += $aCircles[$i2][2] / $nFPS_Cur * $nQ
                                                    $aCircles[$i2][1] += $aCircles[$i2][3] / $nFPS_Cur * $nQ

                                                    $nX_C = $aCircles[$i2][0] - $aCircles[$i1][0]
                                                    $nY_C = $aCircles[$i2][1] - $aCircles[$i1][1]
                                                    $nL_C = Sqrt($nX_C ^ 2 + $nY_C ^ 2)

                                                    $nX_UN = $nX_C / $nL_C
                                                    $nY_UN = $nY_C / $nL_C

                                                    $nVel1_N = ($nX_UN * $aCircles[$i1][2] + $nY_UN * $aCircles[$i1][3]) * $nBounciness
                                                    $nVel2_N = ($nX_UN * $aCircles[$i2][2] + $nY_UN * $aCircles[$i2][3]) * $nBounciness
                                                    $nVel1_T = (-$nY_UN * $aCircles[$i1][2] + $nX_UN * $aCircles[$i1][3]) * $nGroundFriction
                                                    $nVel2_T = (-$nY_UN * $aCircles[$i2][2] + $nX_UN * $aCircles[$i2][3]) * $nGroundFriction

                                                    $nVel1_N_New = ($nVel1_N * ($aCircles[$i1][4] - $aCircles[$i2][4]) + 2 * $aCircles[$i2][4] * $nVel2_N) / ($aCircles[$i1][4] + $aCircles[$i2][4])
                                                    $nVel2_N_New = ($nVel2_N * ($aCircles[$i2][4] - $aCircles[$i1][4]) + 2 * $aCircles[$i1][4] * $nVel1_N) / ($aCircles[$i1][4] + $aCircles[$i2][4])

                                                    $aCircles[$i1][2] = $nVel1_N_New * $nX_UN + $nVel1_T * - $nY_UN
                                                    $aCircles[$i1][3] = $nVel1_N_New * $nY_UN + $nVel1_T * $nX_UN
                                                    $aCircles[$i2][2] = $nVel2_N_New * $nX_UN + $nVel2_T * - $nY_UN
                                                    $aCircles[$i2][3] = $nVel2_N_New * $nY_UN + $nVel2_T * $nX_UN
                                            EndSwitch
                                    EndSwitch
                            EndSwitch
                    EndSwitch
            EndSwitch
        Next

        $aCircles[$i1][0] += $aCircles[$i1][2] / $nFPS_Cur
        $aCircles[$i1][1] += $aCircles[$i1][3] / $nFPS_Cur

        _GDIPlus_GraphicsFillEllipse($hGraphics, $aCircles[$i1][0] - $aCircles[$i1][4], $aCircles[$i1][1] - $aCircles[$i1][4], $aCircles[$i1][4] * 2, $aCircles[$i1][4] * 2, $aCircles[$i1][5])
    Next

    _GDIPlus_GraphicsDrawStringEx($hGraphics, "FPS: " & Round($nFPS_Display, 1), $hFont_FPS, $tLayout_FPS, $hStringFormat, $hBrush_Black)
    _GDIPlus_GraphicsDrawStringEx($hGraphics, "© name22", $hFont_Copyright, $tLayout_Copyright, $hStringFormat, $hBrush_Black)
    _WinAPI_BitBlt($hDC_Main, 0, 0, $iGUIWidth, $iGUIHeight, $hDC_Buffer, 0, 0, $SRCCOPY)
WEnd

Func _Close()
    Exit
EndFunc   ;==>_Close

Func _Shutdown()
    _WinAPI_ReleaseDC($hMain, $hDC_Main)
    _WinAPI_DeleteDC($hDC_Buffer)
    _WinAPI_DeleteObject($hBitmap_Buffer)

    _GDIPlus_GraphicsDispose($hGraphics)
    _GDIPlus_BrushDispose($hBrush_Black)
    For $i = 1 To $aCircles[0][0]
        _GDIPlus_BrushDispose($aCircles[$i][5])
    Next
    _GDIPlus_StringFormatDispose($hStringFormat)
    _GDIPlus_FontFamilyDispose($hFamily_FPS)
    _GDIPlus_FontDispose($hFont_FPS)
    _GDIPlus_Shutdown()

    DllClose($vNTdll)
    DllClose($vUser32Dll)
EndFunc   ;==>_Shutdown

;- Copyright: name22, Donnerstag 12. Mai 2011


; #FUNCTION#;===============================================================================
;
; Name...........: _HighPrecisionSleep()
; Description ...: Sleeps down to 0.1 microseconds
; Syntax.........: _HighPrecisionSleep( $iMicroSeconds, $hDll=False)
; Parameters ....:  $iMicroSeconds      - Amount of microseconds to sleep
;                  $hDll  - Can be supplied so the UDF doesn't have to re-open the dll all the time.
; Return values .: None
; Author ........: Andreas Karlsson (monoceres)
; Modified.......:
; Remarks .......: Even though this has high precision you need to take into consideration that it will take some time for autoit to call the function.
; Related .......:
; Link ..........;
; Example .......; No
;
;;==========================================================================================
Func _HighPrecisionSleep($iMicroSeconds, $hDll = False)
    Local $hStruct, $bLoaded
    If Not $hDll Then
        $hDll = DllOpen("ntdll.dll")
        $bLoaded = True
    EndIf
    $hStruct = DllStructCreate("int64 time;")
    DllStructSetData($hStruct, "time", -1 * ($iMicroSeconds * 10))
    DllCall($hDll, "dword", "ZwDelayExecution", "int", 0, "ptr", DllStructGetPtr($hStruct))
    If $bLoaded Then DllClose($hDll)
EndFunc   ;==>_HighPrecisionSleep