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267 lines
7.6 KiB
C++
267 lines
7.6 KiB
C++
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// ------------------------------------------------------------------
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// Windows 2000 Graphics API Black Book
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// Chapter 8 - Listing 8.1 (Scaled Text 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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#include <commctrl.h>
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#include <cassert>
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// for the MakeFont() function...
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#include "mk_font.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_HREDRAW | CS_VREDRAW;
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wc.lpszClassName = WndClassName;
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wc.lpfnWndProc = MainWndProc;
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wc.hInstance = hInst;
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wc.hCursor = LoadCursor(NULL, IDC_ARROW);
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wc.hbrBackground = reinterpret_cast<HBRUSH>(
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COLOR_BTNFACE + 1
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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(
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WndClassName, TEXT("Scaled Text 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, 800, 300,
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NULL, NULL, hInst, NULL
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);
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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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HWND hTrackBar = NULL;
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HFONT hTTFont = NULL;
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double scale = 0.0;
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LPCSTR pText = TEXT("The Scaled Text!");
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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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INITCOMMONCONTROLSEX icx;
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icx.dwSize = sizeof(INITCOMMONCONTROLSEX);
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icx.dwICC = ICC_BAR_CLASSES;
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InitCommonControlsEx(&icx);
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hTrackBar =
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CreateWindow(
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TRACKBAR_CLASS, "",
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TBS_HORZ | TBS_BOTH | TBS_AUTOTICKS |
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TBS_FIXEDLENGTH | TBS_ENABLESELRANGE |
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WS_CHILD | WS_VISIBLE,
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10, 260, 375, 40,
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hWnd, NULL, hInst, NULL
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);
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assert(hTrackBar != NULL);
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SNDMSG(hTrackBar, TBM_SETTHUMBLENGTH, 20, 0);
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SNDMSG(hTrackBar, TBM_SETRANGEMAX, TRUE, 100);
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// create the TrueType (scalable) font
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HDC hDC = GetDC(hWnd);
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try
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{
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// see Chapter 4 for the definition of MakeFont
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hTTFont = font::MakeFont(hDC, "Impact", 72);
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if (!hTTFont) throw;
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}
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catch (...)
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{
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ReleaseDC(hWnd, hDC);
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}
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ReleaseDC(hWnd, hDC);
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break;
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}
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case WM_HSCROLL:
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{
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if (reinterpret_cast<HWND>(lParam) == hTrackBar)
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{
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//
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// adjust the scaling factor according to
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// the position of the trackbar's slider
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//
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scale = static_cast<double>(
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(SNDMSG(hTrackBar, TBM_GETPOS, 0, 0) + 1) / 50.0
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);
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InvalidateRect(hWnd, NULL, true);
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}
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break;
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}
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case WM_ERASEBKGND:
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{
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LRESULT res = DefWindowProc(hWnd, msg, wParam, lParam);
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HDC hDC = reinterpret_cast<HDC>(wParam);
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HFONT hOldFont = static_cast<HFONT>(
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SelectObject(hDC, hTTFont)
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);
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try
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{
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SetBkMode(hDC, TRANSPARENT);
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// open a path bracket
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if (!BeginPath(hDC)) throw;
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// record the text to the path
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TextOut(hDC, 10, 10, pText, lstrlen(pText));
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// close the path bracket and
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// select the path into hDC
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EndPath(hDC);
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// determine the number of endpoints in the path
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const int num_points = GetPath(hDC, NULL, NULL, 0);
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if (num_points > 0)
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{
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// make room for the POINTs and vertex types
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POINT* pPEnds = new POINT[num_points];
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unsigned char* pTypes = new unsigned char[num_points];
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try
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{
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// get the path's description
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int num_got = GetPath(hDC, pPEnds, pTypes, num_points);
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if (num_got > 0)
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{
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// start a new path bracket
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if (!BeginPath(hDC)) throw;
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// scale each point in the description
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int iPoint;
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for (iPoint = 0; iPoint < num_got; ++iPoint)
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{
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pPEnds[iPoint].x = static_cast<LONG>(
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scale * pPEnds[iPoint].x + 0.5
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);
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pPEnds[iPoint].y = static_cast<LONG>(
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scale * pPEnds[iPoint].y + 0.5
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);
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}
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for (iPoint = 0; iPoint < num_points; ++iPoint)
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{
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// handle the MoveToEx case
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if (pTypes[iPoint] == PT_MOVETO)
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{
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MoveToEx(
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hDC, pPEnds[iPoint].x, pPEnds[iPoint].y, NULL
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);
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}
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// handle the LineTo case
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else if (
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pTypes[iPoint] == PT_LINETO ||
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pTypes[iPoint] == (PT_LINETO | PT_CLOSEFIGURE)
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)
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{
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LineTo(hDC, pPEnds[iPoint].x, pPEnds[iPoint].y);
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}
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// handle the PolyBezierTo case
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else if (
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pTypes[iPoint] == PT_BEZIERTO ||
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pTypes[iPoint] == (PT_BEZIERTO | PT_CLOSEFIGURE)
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)
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{
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PolyBezierTo(hDC, pPEnds + iPoint, 3);
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iPoint += 2;
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}
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}
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// close the new path bracket
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EndPath(hDC);
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// stroke and fill the new path
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StrokeAndFillPath(hDC);
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}
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}
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catch (...)
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{
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// clean up
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delete [] pTypes;
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delete [] pPEnds;
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throw;
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}
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// clean up
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delete [] pTypes;
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delete [] pPEnds;
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}
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// ...
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}
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catch (...)
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{
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SelectObject(hDC, hOldFont);
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}
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SelectObject(hDC, hOldFont);
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return res;
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}
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case WM_SIZE:
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{
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MoveWindow(
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hTrackBar,
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0, HIWORD(lParam) - 40, LOWORD(lParam), 40,
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false
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);
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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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DeleteObject(hTTFont);
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PostQuitMessage(0);
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break;
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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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