Created
October 19, 2018 06:14
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#include <Windows.h> | |
#include <string> | |
#include <sstream> | |
float g_angle = 0; | |
LRESULT CALLBACK WndProc ( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam ) | |
{ | |
switch ( uMsg ) | |
{ | |
case WM_PAINT: | |
{ | |
PAINTSTRUCT ps; | |
HDC hDC = BeginPaint ( hWnd, &ps ); | |
RECT rect; | |
GetClientRect ( hWnd, &rect ); | |
HBITMAP compBitmap = CreateCompatibleBitmap ( hDC, rect.right - rect.left, rect.bottom - rect.top ); | |
HDC compDC = CreateCompatibleDC ( hDC ); | |
HBITMAP oldBitmap = ( HBITMAP ) SelectObject ( compDC, compBitmap ); | |
FillRect ( compDC, &rect, ( HBRUSH ) GetStockObject ( WHITE_BRUSH ) ); | |
const int XOffset = 50, YOffset = 50; | |
Ellipse ( compDC, XOffset, YOffset, 100 + XOffset, 100 + YOffset ); | |
float rad = g_angle / 180 * 3.141592f; | |
float xr = cos ( rad ), yr = sin ( rad ); | |
MoveToEx ( compDC, 50 + XOffset, 50 + YOffset, nullptr ); | |
LineTo ( compDC, XOffset + ( 1 + xr ) * 50, YOffset + ( 1 + yr ) * 50 ); | |
std::wstringstream wss; | |
wss << g_angle << L"˚(" << rad << "RAD), xr: " << xr << ", yr: " << yr; | |
std::wstring wsss = wss.str (); | |
TextOut ( compDC, 0, 0, wsss.c_str (), wsss.size () ); | |
BitBlt ( hDC, 0, 0, rect.right - rect.left, rect.bottom - rect.top, compDC, 0, 0, SRCCOPY ); | |
SelectObject ( compDC, oldBitmap ); | |
DeleteObject ( compDC ); | |
DeleteObject ( compBitmap ); | |
EndPaint ( hWnd, &ps ); | |
} | |
break; | |
case WM_CLOSE: | |
PostQuitMessage ( 0 ); | |
break; | |
default: return DefWindowProc ( hWnd, uMsg, wParam, lParam ); | |
} | |
return 0; | |
} | |
int WINAPI WinMain ( HINSTANCE hInstance, HINSTANCE, LPSTR, int ) | |
{ | |
WNDCLASS wndClass = { | |
CS_VREDRAW | CS_HREDRAW, WndProc, | |
0, 0, | |
hInstance, | |
0, 0, | |
( HBRUSH ) GetStockObject ( WHITE_BRUSH ), | |
NULL, | |
L"AngleTest" | |
}; | |
if ( INVALID_ATOM == RegisterClass ( &wndClass ) ) | |
return -1; | |
HWND hWnd = CreateWindow ( L"AngleTest", L"Angle Test", WS_OVERLAPPEDWINDOW, | |
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, | |
NULL, NULL, hInstance, nullptr ); | |
if ( 0 == hWnd ) | |
return -2; | |
ShowWindow ( hWnd, SW_SHOW ); | |
UpdateWindow ( hWnd ); | |
DWORD lastTickCount = GetTickCount (), currentTickCount; | |
MSG msg; | |
while ( true ) | |
{ | |
if ( PeekMessage ( &msg, 0, 0, 0, PM_NOREMOVE ) ) | |
{ | |
if ( !GetMessage ( &msg, 0, 0, 0 ) ) | |
break; | |
TranslateMessage ( &msg ); | |
DispatchMessage ( &msg ); | |
} | |
else | |
{ | |
currentTickCount = GetTickCount (); | |
if ( currentTickCount - lastTickCount > 1 / 60.0f * 1000 ) | |
{ | |
g_angle += 5.f * ( ( currentTickCount - lastTickCount ) / 1000.0f ); | |
InvalidateRect ( hWnd, nullptr, false ); | |
lastTickCount = currentTickCount; | |
} | |
Sleep ( 1 ); | |
} | |
} | |
return msg.wParam; | |
} |
Author
daramkun
commented
Oct 19, 2018
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