贝塞尔曲线
#include <Windows.h>#include <strsafe.h>
#include "SysMets.h"
#include <math.h>
#define NUM 1000
#define TWOPI (2 * 3.14159)
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nShowCmd) {
static TCHAR szAppName[] = TEXT("Bill");
HWND hwnd;
WNDCLASS wndclass;
MSG msg;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszClassName = szAppName;
wndclass.lpszMenuName = NULL;
wndclass.lpfnWndProc = WndProc;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
RegisterClass(&wndclass);
hwnd = CreateWindow(TEXT("Bill"), TEXT("Tip"), WS_OVERLAPPEDWINDOW | WS_HSCROLL | WS_VSCROLL,
CW_USEDEFAULT, 40, CW_USEDEFAULT, 100,
NULL, NULL, hInstance, NULL);
ShowWindow(hwnd, nShowCmd);
UpdateWindow(hwnd);
while (GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
WPARAM wParam, LPARAM lParam) {
HDC hdc;
static int cxClient, cyClient;
int i;
PAINTSTRUCT ps;
static POINT apt;
switch (message) {
case WM_CREATE:
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
PolyBezier(hdc, apt, 4);
EndPaint(hwnd, &ps);
return 0;
case WM_LBUTTONDOWN:
hdc = GetDC(hwnd);
SelectObject(hdc, GetStockObject(WHITE_PEN));
PolyBezier(hdc, apt, 4);
apt.x = LOWORD(lParam);
apt.y = HIWORD(lParam);
SelectObject(hdc, GetStockObject(BLACK_PEN));
PolyBezier(hdc, apt, 4);
ReleaseDC(hwnd, hdc);
return 0;
case WM_RBUTTONDOWN:
hdc = GetDC(hwnd);
SelectObject(hdc, GetStockObject(WHITE_PEN));
PolyBezier(hdc, apt, 4);
apt.x = LOWORD(lParam);
apt.y = HIWORD(lParam);
SelectObject(hdc, GetStockObject(BLACK_PEN));
PolyBezier(hdc, apt, 4);
ReleaseDC(hwnd, hdc);
return 0;
case WM_SIZE:
cxClient = LOWORD(lParam);
cyClient = HIWORD(lParam);
apt.x = cxClient / 4;
apt.y = cyClient / 2;
apt.x = cxClient / 2;
apt.y = cyClient / 4;
apt.x = cxClient / 2;
apt.y = cyClient * 3 / 4;
apt.x = cxClient * 3 / 4;
apt.y = cyClient / 2;
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
default:
return DefWindowProc(hwnd, message, wParam, lParam);
}
}
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