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/*~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=
**** FILE: POV.CPP** DATE: 3/31/97** PROJ: ATLAS** PROG: JKH** COMMENTS: **** DESCRIPTION: Window class for a 360 degree Point Of View control** ** **** NOTE: There are some issues with using extern "C" in this file.** If you don't understand why they are there, you're not** alone. For now, and probably for a while they will be** here though, because I can't get this file and others** that use these services to compile without them.** Unfortunately the dynamics of this project don't really** afford me the time at present to figure this out.** TODO: figure this out**** HISTORY:** DATE WHO WHAT** ---- --- ----** 3/31/97 a-kirkh Wrote it.** ******** Copyright (C) Microsoft 1997. All Rights Reserved.****~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=*/#pragma pack (8)
#include "POV.H" //This module's stuff.
#include "resource.h"
extern HWND hPOVWnd = NULL;
static HINSTANCE ghResInst;static LPRECT prctOldRegionBox;static LPRECT prctNewRegionBox;double degrees = -1;
void SetDegrees(int dDegrees){ degrees = (double)dDegrees; PostMessage(hPOVWnd, PM_MYJOYPOSCHANGED, 0, 0);}
extern "C"{
void SetResourceInstance(HINSTANCE hInstance) { ghResInst = hInstance; }
HINSTANCE GetResourceInstance() { return(ghResInst); }
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// FUNCTION : POVWndProc
// REMARKS : The callback function for the POVHat Window.
//
// PARAMS : The usual callback funcs for message handling
//
// RETURNS : LRESULT - Depends on the message
// CALLS :
// NOTES :
// WM_PAINT - Just calls DrawControl
//
// PM_MYJOYPOSCHANGED - This is a private (WM_USER) message that is
// called whenever a change in the POV hat occurs.
//
RECT rClient; HDC hDC; PAINTSTRUCT ps; LONG cxClient, cyClient; HRGN hRegion; HBITMAP hPOVHubBitmap = NULL;
LRESULT CALLBACK POVWndProc(HWND hWnd, UINT iMsg, WPARAM wParam, LPARAM lParam) { switch( iMsg ) { case WM_CREATE: hPOVWnd = hWnd; return(0);
case WM_PAINT: { hDC = BeginPaint(hWnd, &ps); DrawControl(hWnd, hDC); EndPaint(hWnd, &ps); } return(0);
case PM_MYJOYPOSCHANGED: { degrees /= 100; // if angle == 180, degrees comes in as 18000
GetCurrentArrowRegion(&hRegion);
if( hRegion ) { GetRgnBox(hRegion, prctNewRegionBox); InvalidateRect(hWnd, prctOldRegionBox, TRUE); InvalidateRect(hWnd, prctNewRegionBox, TRUE); DeleteObject(hRegion); } }
default: return(DefWindowProc(hWnd, iMsg,wParam, lParam)); } }
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// FUNCTION : DrawControl
// REMARKS : Function called by WM_PAINT that draws the POV hat control
// PARAMS : HWND - Control's window handle
// HDC - Control's dc created with BeginPaint
// RETURNS : void
// CALLS : GetCurrentArrowRegion
// NOTES :
// 1) So that stuff can be centered.
// 2) Bitblt that hub thingy in the middle.
// 3) Disallow any problems with aspect ratio.
// 4) Draw the circle, should be round because of 3.
// 5) a.Get the coordinates of the rotated arrow.
// b.Paint the region.
// c.Get the bounding rectangle of the region so we
// can invalidate it next time around.
void DrawControl(HWND hWnd, HDC hDC) { assert(hWnd); assert(hDC);
// 1) Get client size information
SetMapMode(hDC, MM_TEXT); GetClientRect(hWnd, &rClient); cxClient = rClient.right - rClient.left; cyClient = -(rClient.bottom - rClient.top);
// 2) Load the hub bitmap and display it
hPOVHubBitmap = LoadBitmap((HMODULE)ghResInst, MAKEINTRESOURCE(IDB_POVHUB)); assert(hPOVHubBitmap);
DrawBitmap(hDC, hPOVHubBitmap, cxClient/2 - 8, -cyClient/2 - 8); DeleteObject(hPOVHubBitmap);
// 3) Setup the window to use symmetrical units on a 1000 X 1000 cartesian grid
SetMapMode(hDC, MM_ISOTROPIC); SetWindowExtEx(hDC, 1000, 1000, NULL); SetViewportExtEx(hDC, cxClient / 2, cyClient / 2, NULL); SetViewportOrgEx(hDC, cxClient / 2, -cyClient / 2, NULL);
// 4) Draw the circle upon which the arrow seems to rotate
SelectObject(hDC, (HBRUSH)GetStockObject(NULL_BRUSH)); HPEN hPen = CreatePen( PS_SOLID, 1, CIRCLECOLOR); //PREFIX: dereferencing NULL pointer 'hPen'
//Millen Bug#129156, manbug 29347
if( hPen != NULL ) { HPEN hPenOld = (HPEN)SelectObject(hDC, hPen); Ellipse(hDC, -CIRCLERADIUS, CIRCLERADIUS, CIRCLERADIUS, -CIRCLERADIUS); SelectObject(hDC, hPenOld); DeleteObject(hPen); }
// 5) Paint the Arrow at the correct angle if POV active
if( degrees >= 0 ) { HBRUSH hBrush = CreateSolidBrush( CIRCLECOLOR ); if( !hBrush ) { return; }
HBRUSH hBrushOld = (HBRUSH)SelectObject(hDC, hBrush); assert(hBrushOld);
GetCurrentArrowRegion(&hRegion); if( !hRegion ) { return; }
PaintRgn(hDC, hRegion);
// GetRgnBox returns zero if it fails...
GetRgnBox(hRegion, prctOldRegionBox); SelectObject(hDC, hBrushOld);
DeleteObject(hBrush); DeleteObject(hRegion); } }
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// FUNCTION : RegisterPOVClass
// REMARKS : Registers the POV Hat window.
//
// PARAMS : hInstance - Used for the call to RegisterClassEx
//
// RETURNS : TRUE - if successfully registered
// FALSE - failed to register
// CALLS : RegisterClassEx
// NOTES :
//
extern BOOL RegisterPOVClass(HINSTANCE hInstance) {
WNDCLASSEX POVWndClass;
POVWndClass.cbSize = sizeof(POVWndClass); POVWndClass.style = CS_HREDRAW | CS_VREDRAW; POVWndClass.lpfnWndProc = POVWndProc; POVWndClass.cbClsExtra = 0; POVWndClass.cbWndExtra = 0; POVWndClass.hInstance = hInstance; POVWndClass.hIcon = NULL; POVWndClass.hCursor = LoadCursor(NULL, IDC_ARROW); POVWndClass.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1); POVWndClass.lpszMenuName = NULL; POVWndClass.lpszClassName = "POVHAT"; POVWndClass.hIconSm = NULL;
if( RegisterClassEx( &POVWndClass ) == 0 ) return(FALSE);
return(TRUE); }
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// FUNCTION : DrawBitmap
// REMARKS : Copied verbatim from Petzold (WIN95 pg 190)
// PARAMS : HDC - dc for drawing
// HBITMAP - bitmap to draw
// int xstart, ystart - where to place the bitmap
//
// RETURNS : void
// CALLS :
// NOTES :
//
void DrawBitmap(HDC hDC, HBITMAP hBitmap, int xStart, int yStart) { BITMAP bm; HDC hdcMem; POINT ptSize, ptOrg;
hdcMem = CreateCompatibleDC(hDC); // Found by prefix: Millen Bug129155. manbugs 29339
// If CreateCompatibleDC fails, we should'nt proceed.
if( hdcMem == NULL ) return;
SelectObject(hdcMem, hBitmap); SetMapMode(hdcMem,GetMapMode(hDC));
GetObject(hBitmap, sizeof(BITMAP), (LPVOID)&bm); ptSize.x = bm.bmWidth; ptSize.y = bm.bmHeight; DPtoLP(hDC, &ptSize, 1); ptOrg.x = 0; ptOrg.y = 0; DPtoLP(hdcMem, &ptOrg, 1);
BitBlt(hDC, xStart, yStart, ptSize.x, ptSize.y, hdcMem, ptOrg.x, ptOrg.y, SRCAND);
DeleteDC(hdcMem); }
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// FUNCTION : GetCurrentArrowRegion
// REMARKS : Rotates and translate a set of vertices that represents
// the POV hat arrow
//
// PARAMS : HRGN - The region to be rotated
//
// RETURNS : BOOL
// CALLS : GETXCOORD, GETYCOORD (POV.H)
// NOTES :
//
void GetCurrentArrowRegion(HRGN* hRegion) { POINT aptPoints[8];
VERTICEINFO aptVInfo[8] = { XARROWPOINT ,YARROWPOINT , XARROWRIGHTOUT ,YARROWRIGHTOUT , XARROWRIGHTIN ,YARROWRIGHTIN , XARROWRIGHTBOTTOM,YARROWRIGHTBOTTOM, XARROWLEFTBOTTOM ,YARROWLEFTBOTTOM , XARROWLEFTIN ,YARROWLEFTIN , XARROWLEFTOUT ,YARROWLEFTOUT , XARROWPOINT ,YARROWPOINT};
aptPoints[0].x = GETXCOORD(aptVInfo[0].y, aptVInfo[0].x, degrees); aptPoints[0].y = GETYCOORD(aptVInfo[0].y, aptVInfo[0].x, degrees); aptPoints[1].x = GETXCOORD(aptVInfo[1].y, aptVInfo[1].x, degrees); aptPoints[1].y = GETYCOORD(aptVInfo[1].y, aptVInfo[1].x, degrees); aptPoints[2].x = GETXCOORD(aptVInfo[2].y, aptVInfo[2].x, degrees); aptPoints[2].y = GETYCOORD(aptVInfo[2].y, aptVInfo[2].x, degrees); aptPoints[3].x = GETXCOORD(aptVInfo[3].y, aptVInfo[3].x, degrees); aptPoints[3].y = GETYCOORD(aptVInfo[3].y, aptVInfo[3].x, degrees); aptPoints[4].x = GETXCOORD(aptVInfo[4].y, aptVInfo[4].x, degrees); aptPoints[4].y = GETYCOORD(aptVInfo[4].y, aptVInfo[4].x, degrees); aptPoints[5].x = GETXCOORD(aptVInfo[5].y, aptVInfo[5].x, degrees); aptPoints[5].y = GETYCOORD(aptVInfo[5].y, aptVInfo[5].x, degrees); aptPoints[6].x = GETXCOORD(aptVInfo[6].y, aptVInfo[6].x, degrees); aptPoints[6].y = GETYCOORD(aptVInfo[6].y, aptVInfo[6].x, degrees); aptPoints[7].x = GETXCOORD(aptVInfo[7].y, aptVInfo[7].x, degrees); aptPoints[7].y = GETYCOORD(aptVInfo[7].y, aptVInfo[7].x, degrees);
*hRegion = CreatePolygonRgn(aptPoints, 8, WINDING); }
}
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