C言語で画面がおかしくなる
最近C言語でプログラムを書き始めました。
二次関数を作るスクリプトなんですが、一定時間がたつと画面がおかしくなります。
どこが問題なのか探しても見つからないので、わかる方教えてください。
WinMainの部分は省いてます
#include<windows.h>
#include<stdio.h>
#include <stdlib.h>
#include<time.h>
#define TIMER_ID 1
#define spy(num) (wy-num)
int rnd(int r);
void bset(HDC hdc, int x, int y);
LRESULT CALLBACK WndProc(HWND hwnd , UINT msg , WPARAM wp , LPARAM lp) {
HDC hDC;
static int DesktopX ,DesktopY;
static HDC hdc;
static HDC Mhdc;
static HBITMAP BMPhdc;
PAINTSTRUCT paint;
RECT Rect;
LOGPEN lopnPen;
POINT CursorP, ScreenP;
char str[250];
int i;
static int wx, wy ,ky;
static double a ,b ,c ,x ,y ,n ,m ,s ,t;
switch (msg) {
case WM_DESTROY:
DeleteObject( BMPhdc );
DeleteDC( Mhdc );
PostQuitMessage(0);
return 0;
case WM_CREATE:
SetTimer(hwnd, TIMER_ID, 10, NULL);
hDC = GetDC(hwnd);
hdc = CreateCompatibleDC( hDC );
GetClientRect(GetDesktopWindow() ,&Rect);
DesktopX = Rect.right ;DesktopY = Rect.bottom;
BMPhdc = CreateCompatibleBitmap( hDC, DesktopX, DesktopY );
SelectObject( hdc, BMPhdc );
ReleaseDC( hwnd, hDC );
GetClientRect(hwnd, &Rect);
wx = Rect.right ;wy = Rect.bottom;
x = rnd(wx); y = rnd(wy);
n = rnd(wx); m = rnd(wy);
return 0;
case WM_TIMER:
ScreenP.x = LOWORD(lp);
ScreenP.y = HIWORD(lp);
GetClientRect(hwnd, &Rect);
wx = Rect.right ;wy = Rect.bottom;
if( ky == 1 ){
x = rnd(wx); y = rnd(wy);
n = rnd(wx); m = rnd(wy);
}
ClientToScreen(hwnd ,&ScreenP);
GetCursorPos(&CursorP);
s = CursorP.x-ScreenP.x;
t = wy-(CursorP.y-ScreenP.y);
InvalidateRect(hwnd, NULL, FALSE);
return 0;
case WM_RBUTTONDOWN:
ky = 1;
return 0;
case WM_RBUTTONUP:
ky = 0;
return 0;
case WM_PAINT:
Mhdc = BeginPaint(hwnd, &paint);
SelectObject(hdc , CreateSolidBrush(RGB(255,255,255)));
lopnPen.lopnStyle = PS_NULL;
SelectObject(hdc , CreatePenIndirect(&lopnPen));
Rectangle(hdc , 0 , 0 , wx+1 , wy+1);
SelectObject(hdc , CreateSolidBrush(RGB(255,0,0)));
if ((s-n) != 0 && (n-x) != 0 && (s-x) != 0){
a = ((t-m)/(s-n) - (m-y)/(n-x)) / (s-x);
b = (m-y)/(n-x) - a*(n+x);
c = y - a*x*x -b*x;
}
bset(hdc, x,spy(y));
bset(hdc, n,spy(m));
bset(hdc, s,spy(t));
lopnPen.lopnStyle = PS_SOLID;
lopnPen.lopnColor = RGB(0,0,255);
SelectObject(hdc , CreatePenIndirect(&lopnPen));
MoveToEx(hdc , -1 , spy( a + b - c) , NULL);
for(i = 0 ; i <= wx ;i++){
LineTo(hdc , i , spy( a*i*i - b*i - c));
}
BitBlt(Mhdc, 0, 0, DesktopX, DesktopY, hdc, 0, 0, SRCCOPY );
EndPaint(hwnd, &paint);
return 0;
}
return DefWindowProc(hwnd , msg , wp , lp);
}
int rnd(int r){
static int flag;
if (flag == 0) {
srand((unsigned int)time(NULL));
flag = 1;
}
return (int)(rand()*(r+1.0)/(1.0+RAND_MAX));
}
void bset(HDC hdc, int x, int y){
static LOGPEN lopnPen;
lopnPen.lopnStyle = PS_NULL;
SelectObject(hdc , CreatePenIndirect(&lopnPen));
Rectangle(hdc , x-3 , y-3 , x+3 , y+3);
return;
}
お礼
ありがとうございました 以下のようにしたらほとんどクライアントからはずれなくなりました case WM_MOUSEMOVE: if(wP==MK_LBUTTON) { if(0<=i_x && 0<=i_y) { GetWindowRect(hW,&rt); MoveWindow (hW, rt.left+LOWORD(lP)-i_x, rt.top+HIWORD(lP)-i_y, rt.right-rt.left,rt.bottom-rt.top,1); } } else i_x=i_y=-1; return 0; case WM_LBUTTONDOWN: ReleaseCapture(); SendMessage(hW,WM_SYSCOMMAND,SC_MOVE+2,0); i_x=LOWORD(lP);i_y=HIWORD(lP); return 0;