Main.cpp

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// MIT License
//
// Copyright (c) 2020 Ian Parberry
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.

#include "CMain.h"

static CMain* g_pMain = nullptr; 


LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){
  UINT nMenuId = 0; //menu identifier for menu command messages
  static bool bResizing = false;

  switch(message){
    case WM_CREATE: //window has been created
      g_pMain = new CMain(hWnd); //create the main class
      return 0;

    case WM_DESTROY: //window has been removed from the screen
      delete g_pMain; //delete the main class
      PostQuitMessage(0); //ready to shut down
      return 0;
      
    case WM_SIZING: //user is resizing the window
      MinDragRect(hWnd, wParam, (RECT*)lParam, 320); //enforce minimum size
      return 0;

    case WM_PAINT: //window needs to be redrawn
      g_pMain->OnPaint();
      return 0;
 
    case WM_COMMAND: //user has selected a command from the menu
      nMenuId = LOWORD(wParam); //menu id

      //first the L-system types 

      if(IDM_LSYS_BRANCHING <= nMenuId && nMenuId <= IDM_LSYS_HEXGOSPER)
        g_pMain->SetType(nMenuId);

      else switch(nMenuId){  //now the other manu entries
        case IDM_FILE_GENERATE: //generate a stochastic L-system
          if(g_pMain->IsStochastic()){
            g_pMain->Generate();
            g_pMain->Draw();
          } //if
          break;         

        case IDM_FILE_SAVE: //save bitmap to image file       
          SaveBitmap(hWnd, g_pMain->GetBitmap());
          break;

        case IDM_VIEW_THICKLINES: //draw with thick lines
          g_pMain->ToggleLineThickness();
          break;

        case IDM_VIEW_RULES: //draw or hide the rule string
          g_pMain->ToggleShowRules();
          break;

        case IDM_FILE_QUIT: //so long, farewell, auf weidersehn, goodbye!
          SendMessage(hWnd, WM_CLOSE, 0, 0);
          break;
      } //switch

      return 0; //all is good

    default: return DefWindowProc(hWnd, message, wParam, lParam); //not my message
  } //switch
} //WndProc


int WINAPI wWinMain(HINSTANCE hInst, HINSTANCE hPrev, LPWSTR lpStr, int nShow){
  UNREFERENCED_PARAMETER(hPrev); //nope
  UNREFERENCED_PARAMETER(lpStr); //nope nope

  InitWindow(hInst, nShow, WndProc); //create and show a window

  MSG msg; //current message

  while(GetMessage(&msg, nullptr, 0, 0)){ //message pump
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  } //while

  return (int)msg.wParam;
} //wWinMain