#include <windows.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
HINSTANCE g_hInst;
LPSTR lpszClass="Radio";
struct dot{
 POINT p;
 int color;
 int size1;
}; dot P[100];
int curcol=0;

int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance
    ,LPSTR lpszCmdParam,int nCmdShow)
{
 HWND hWnd;
 MSG Message;
 WNDCLASS WndClass;
 g_hInst=hInstance;
 
 WndClass.cbClsExtra=0;
 WndClass.cbWndExtra=0;
 WndClass.hbrBackground=(HBRUSH)(COLOR_BTNFACE+1);
 WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);
 WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
 WndClass.hInstance=hInstance;
 WndClass.lpfnWndProc=(WNDPROC)WndProc;
 WndClass.lpszClassName=lpszClass;
 WndClass.lpszMenuName=NULL;
 WndClass.style=CS_HREDRAW | CS_VREDRAW;
 RegisterClass(&WndClass);

 hWnd=CreateWindow(lpszClass,lpszClass,WS_OVERLAPPEDWINDOW,
  CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
  NULL,(HMENU)NULL,hInstance,NULL);
 ShowWindow(hWnd,nCmdShow);
 
 while(GetMessage(&Message,0,0,0)) {
  TranslateMessage(&Message);
  DispatchMessage(&Message);
 }
 return Message.wParam;
}

#define ID_R1 101
#define ID_R2 102
#define ID_R3 103
#define ID_R4 104
#define ID_R5 105
#define ID_R6 106
HWND r1,r2,r3,r4,r5,r6;
LRESULT CALLBACK WndProc(HWND hWnd,UINT iMessage,WPARAM wParam,LPARAM lParam)
{
 HDC hdc;
 PAINTSTRUCT ps;
 HBRUSH hBrush, oldBrush;
 int x,y,i;
 static int counta=0;
 switch(iMessage) {
 case WM_CREATE:
  CreateWindow("button","Graph",WS_CHILD | WS_VISIBLE |
   BS_GROUPBOX,5,5,120,110,hWnd,(HMENU)0,g_hInst,NULL);
  CreateWindow("button","Color",WS_CHILD | WS_VISIBLE |
   BS_GROUPBOX,145,5,120,110,hWnd,(HMENU)1,g_hInst,NULL);
  r1=CreateWindow("button","size 10px",WS_CHILD | WS_VISIBLE |
   BS_AUTORADIOBUTTON | WS_GROUP,
   10,20,100,30,hWnd,(HMENU)ID_R1,g_hInst,NULL);
  r2=CreateWindow("button","size 20px",WS_CHILD | WS_VISIBLE |
   BS_AUTORADIOBUTTON,
   10,50,100,30,hWnd,(HMENU)ID_R2,g_hInst,NULL);
  r3=CreateWindow("button","size 30px",WS_CHILD | WS_VISIBLE |
   BS_AUTORADIOBUTTON,
   10,80,100,30,hWnd,(HMENU)ID_R3,g_hInst,NULL);
  r4=CreateWindow("button","Red",WS_CHILD | WS_VISIBLE |
   BS_AUTORADIOBUTTON | WS_GROUP,
   150,20,100,30,hWnd,(HMENU)ID_R4,g_hInst,NULL);
  r5=CreateWindow("button","Blue",WS_CHILD | WS_VISIBLE |
   BS_AUTORADIOBUTTON,
   150,50,100,30,hWnd,(HMENU)ID_R5,g_hInst,NULL);
  r6=CreateWindow("button","Green",WS_CHILD | WS_VISIBLE |
   BS_AUTORADIOBUTTON,
   150,80,100,30,hWnd,(HMENU)ID_R6,g_hInst,NULL);
  CheckRadioButton(hWnd, ID_R1, ID_R3, ID_R1);
  CheckRadioButton(hWnd, ID_R4, ID_R6, ID_R4);
  
  break;
 case WM_LBUTTONDOWN:
 hdc= GetDC(hWnd);
  x = LOWORD (lParam) ;
  y = HIWORD (lParam) ;
  
  P[counta].p.x = x;          ///클릭한거 x좌표받기
  P[counta].p.y = y;    ///클릭한거 y좌표받기

  P[counta].color = curcol;  //현재색상
  counta++;
 
  InvalidateRect(hWnd,NULL,TRUE);   //WM_PAINT에서 그림그리기
  
  return 0 ;
 case WM_COMMAND:
  if (HIWORD(wParam) == BN_CLICKED) {
   switch (LOWORD(wParam)) {
   case ID_R1:
    P[counta].size1=5;   //라디오 버튼 1번선택시 사이즈 5
    break;
   case ID_R2:
    P[counta].size1=15;//라디오 버튼 2번선택시 사이즈 15

    break;
   case ID_R3:
    P[counta].size1=25; //라디오 버튼 3번선택시 사이즈 25

    break;
   case ID_R4: //라디오 버튼 4번선택시 색상 0

    curcol=0;
    break;
   case ID_R5: //라디오 버튼 4번선택시 색상 1
    curcol = 1;
   
    break;
   case ID_R6: //라디오 버튼 4번선택시 색상 2
    curcol=2;
    break;
   }
  }
  return 0;

 case WM_PAINT:
  hdc=BeginPaint(hWnd,&ps);
 
  for(i=0;i<counta;i++){
 
  switch (P[counta].color) {
   case 0:
   hBrush=CreateSolidBrush(RGB(255,0,0));    //컬러가 0일때 브러시 빨간색
   oldBrush=(HBRUSH)SelectObject(hdc, hBrush);
   break;
   case 1:
   hBrush=CreateSolidBrush(RGB(0,0,255)); //컬러가 1일때 브러시 파란색
   oldBrush=(HBRUSH)SelectObject(hdc, hBrush);
   break;
   case 2:
   hBrush=CreateSolidBrush(RGB(0,255,0)); //컬러가 2일때 브러시 초록색
   oldBrush=(HBRUSH)SelectObject(hdc, hBrush);
   break;}
  
 
  
  Ellipse(hdc,P[i].p.x-P[i].size1,P[i].p.y-P[i].size1, P[i].p.x+P[i].size1, P[i].p.y+P[i].size1); //점그리기
  }
  break;
  
  EndPaint(hWnd,&ps);
  return 0;
 case WM_DESTROY:
  PostQuitMessage(0);
  return 0;
 }
 return(DefWindowProc(hWnd,iMessage,wParam,lParam));
}

점찍기 문제인데
라디오버튼 그룹이 2개가있음
하나는 사이즈 고르는거 하나는 컬러설정
////////
LBUTTONDOWN 까지는 잘먹히는거같음
근데 이게 라디오버튼을 한번 클릭할때만 점이찍어짐
색깔을 바꾸는 라디오버튼은 아예 안먹힘
어디가 잘못된걸까요.. 저는 뚤어져라 쳐다봐도 잘모르겟네욤