mirror of
https://github.com/reactos/reactos.git
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271 lines
7.4 KiB
C++
271 lines
7.4 KiB
C++
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// ------------------------------------------------------------------
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// Windows 2000 Graphics API Black Book
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// Chapter 2 - Listing 2.1 (PatBlt Tracking Rect Demo)
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//
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// Created by Damon Chandler <dmc27@ee.cornell.edu>
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// Updates can be downloaded at: <www.coriolis.com>
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//
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// Please do not hesistate to e-mail me at dmc27@ee.cornell.edu
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// if you have any questions about this code.
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// ------------------------------------------------------------------
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//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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#include <windows.h>
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//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
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HINSTANCE HInst;
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const char* WndClassName = "GMainWnd";
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LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
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LPARAM LParam);
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int APIENTRY WinMain(HINSTANCE HInstance, HINSTANCE, LPTSTR,
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int nCmdShow)
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{
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HInst = HInstance;
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WNDCLASS wc;
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memset(&wc, 0, sizeof(WNDCLASS));
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wc.style = CS_VREDRAW | CS_HREDRAW;
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wc.lpszClassName = WndClassName;
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wc.lpfnWndProc = MainWndProc;
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wc.hInstance = HInstance;
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wc.hCursor = LoadCursor(NULL, IDC_ARROW);
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wc.hbrBackground = static_cast<HBRUSH>(
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GetStockObject(BLACK_BRUSH)
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);
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if (RegisterClass(&wc))
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{
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HWND HWnd =
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CreateWindow(WndClassName,
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TEXT("PatBlt Tracking Rect Demo"),
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WS_OVERLAPPEDWINDOW | WS_CAPTION |
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WS_VISIBLE | WS_CLIPCHILDREN,
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CW_USEDEFAULT, CW_USEDEFAULT, 640, 480,
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NULL, NULL, HInst, NULL);
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if (HWnd)
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{
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ShowWindow(HWnd, nCmdShow);
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UpdateWindow(HWnd);
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MSG msg;
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while (GetMessage(&msg, NULL, 0, 0))
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{
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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}
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}
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}
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return 0;
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}
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//------------------------------------------------------------------
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// image related
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HDC HMemDC = NULL;
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HBITMAP HOldBmp = NULL;
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const char* filename = "PENGUIN.BMP";
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RECT RImage = {225, 110, 225, 110};
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// tracking related
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bool is_tracking = false;
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HDC HScreenDC = NULL;
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POINT PMouse = {0, 0};
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RECT RTrack = {0, 0, 0, 0};
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const int line_width = 5;
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// utility function to map to/from window coordinates
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void MapRect(IN HWND HWndFrom, IN HWND HWndTo, IN OUT RECT& RMap)
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{
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MapWindowPoints(
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HWndFrom, HWndTo,
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reinterpret_cast<LPPOINT>(&RMap), 2
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);
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}
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//------------------------------------------------------------------
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// utility function that uses the PatBlt function to
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// render a tracking rectangle
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void RenderTrackingRect(IN HDC HDestDC, IN const RECT& RRender)
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{
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const int width = RRender.right - RRender.left;
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const int height = RRender.bottom - RRender.top;
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const DWORD dwROP3 = DSTINVERT; // experiment with others
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// render top bar
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PatBlt(HDestDC,
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RRender.left, RRender.top,
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width, line_width,
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dwROP3);
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// render bottom bar
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PatBlt(HDestDC,
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RRender.left, RRender.bottom - line_width,
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width, line_width,
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dwROP3);
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// render left bar
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PatBlt(HDestDC,
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RRender.left, RRender.top + line_width,
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line_width, height - (2 * line_width),
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dwROP3);
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// render right bar
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PatBlt(HDestDC,
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RRender.right - line_width, RRender.top + line_width,
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line_width, height - (2 * line_width),
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dwROP3);
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}
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//------------------------------------------------------------------
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LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
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LPARAM LParam)
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{
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switch (Msg)
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{
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case WM_CREATE:
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{
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// create a memory DC
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HMemDC = CreateCompatibleDC(NULL);
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if (HMemDC)
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{
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// load the penguin bitmap
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HBITMAP HBmp = static_cast<HBITMAP>(
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LoadImage(HInst, filename, IMAGE_BITMAP, 0, 0,
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LR_LOADFROMFILE | LR_DEFAULTSIZE)
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);
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if (HBmp)
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{
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// get the bitmap's dimensions
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BITMAP bmp;
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if (GetObject(HBmp, sizeof(BITMAP), &bmp))
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{
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RImage.right += bmp.bmWidth;
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RImage.bottom += bmp.bmHeight;
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// realize the bitmap
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HOldBmp = static_cast<HBITMAP>(
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SelectObject(HMemDC, HBmp)
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);
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}
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else DeleteObject(HBmp);
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}
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}
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break;
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}
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case WM_LBUTTONDOWN:
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{
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PMouse.x = LOWORD(LParam);
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PMouse.y = HIWORD(LParam);
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RECT RClient;
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if (PtInRect(&RImage, PMouse) &&
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GetClientRect(HWnd, &RClient))
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{
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MapRect(HWnd, HWND_DESKTOP, RClient);
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ClipCursor(&RClient);
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// grab a handle to the screen DC and clip
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// all output to the client area of our window
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HScreenDC = GetDC(NULL);
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HRGN HClipRgn = CreateRectRgnIndirect(&RClient);
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SelectClipRgn(HScreenDC, HClipRgn);
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DeleteObject(HClipRgn);
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CopyRect(&RTrack, &RImage);
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MapRect(HWnd, HWND_DESKTOP, RTrack);
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// render the first tracking rect
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RenderTrackingRect(HScreenDC, RTrack);
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is_tracking = true;
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}
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break;
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}
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case WM_MOUSEMOVE:
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{
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if (HScreenDC && is_tracking)
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{
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POINT PCurrent = {LOWORD(LParam), HIWORD(LParam)};
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const int dX = PCurrent.x - PMouse.x;
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const int dY = PCurrent.y - PMouse.y;
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// erase the previous rectangle
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RenderTrackingRect(HScreenDC, RTrack);
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// update the postion
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OffsetRect(&RTrack, dX, dY);
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// render the new tracking rectangle
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RenderTrackingRect(HScreenDC, RTrack);
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// update the mouse position
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memcpy(&PMouse, &PCurrent, sizeof(POINT));
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}
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break;
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}
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case WM_LBUTTONUP:
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{
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// clean up
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if (is_tracking)
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{
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is_tracking = false;
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SelectClipRgn(HScreenDC, NULL);
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ReleaseDC(NULL, HScreenDC);
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InvalidateRect(HWnd, &RImage, true);
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CopyRect(&RImage, &RTrack);
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MapRect(HWND_DESKTOP, HWnd, RImage);
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InvalidateRect(HWnd, &RImage, true);
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ClipCursor(NULL);
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}
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break;
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}
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case WM_PAINT:
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{
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PAINTSTRUCT ps;
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HDC Hdc = BeginPaint(HWnd, &ps);
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try
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{
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//
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// TODO: Add palette support...
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//
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// render the penguin
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BitBlt(Hdc, RImage.left, RImage.top,
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RImage.right - RImage.left,
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RImage.bottom - RImage.top,
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HMemDC, 0, 0,
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SRCCOPY);
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}
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catch (...)
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{
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EndPaint(HWnd, &ps);
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}
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EndPaint(HWnd, &ps);
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break;
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}
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case WM_DESTROY:
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{
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// clean up
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if (HOldBmp)
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{
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DeleteObject(SelectObject(HMemDC, HOldBmp));
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}
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if (HMemDC)
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{
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DeleteDC(HMemDC);
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}
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PostQuitMessage(0);
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return 0;
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}
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}
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return DefWindowProc(HWnd, Msg, WParam, LParam);
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}
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//------------------------------------------------------------------
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