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77 lines
1.5 KiB
77 lines
1.5 KiB
#include <windows.h>
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#include <time.h>
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LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
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void DrawPixels(HWND hwnd);
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int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
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PWSTR lpCmdLine, int nCmdShow) {
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MSG msg;
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WNDCLASSW wc = {0};
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wc.style = CS_HREDRAW | CS_VREDRAW;
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wc.lpszClassName = L"Pixels";
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wc.hInstance = hInstance;
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wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
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wc.lpfnWndProc = WndProc;
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wc.hCursor = LoadCursor(0, IDC_ARROW);
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RegisterClassW(&wc);
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CreateWindowW(wc.lpszClassName, L"Pixels",
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WS_OVERLAPPEDWINDOW | WS_VISIBLE,
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100, 100, 300, 250, NULL, NULL, hInstance, NULL);
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while (GetMessage(&msg, NULL, 0, 0)) {
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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}
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srand(time(NULL));
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return (int) msg.wParam;
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}
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LRESULT CALLBACK WndProc(HWND hwnd, UINT msg,
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WPARAM wParam, LPARAM lParam) {
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switch(msg) {
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case WM_PAINT:
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DrawPixels(hwnd);
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break;
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case WM_DESTROY:
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PostQuitMessage(0);
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return 0;
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}
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return DefWindowProcW(hwnd, msg, wParam, lParam);
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}
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void DrawPixels(HWND hwnd) {
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PAINTSTRUCT ps;
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RECT r;
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GetClientRect(hwnd, &r);
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if (r.bottom == 0) {
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return;
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}
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HDC hdc = BeginPaint(hwnd, &ps);
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for (int i=0; i<1000; i++) {
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int x = rand() % r.right;
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int y = rand() % r.bottom;
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SetPixel(hdc, x, y, RGB(255, 0, 0));
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}
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EndPaint(hwnd, &ps);
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}
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