Create pixels.c

graphics/pixels.c

@@ -0,0 +1,77 @@
+#include <windows.h>
+#include <time.h>
+
+LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
+void DrawPixels(HWND hwnd);
+
+int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
+    PWSTR lpCmdLine, int nCmdShow) {
+
+    MSG  msg;
+    WNDCLASSW wc = {0};
+
+    wc.style = CS_HREDRAW | CS_VREDRAW;
+    wc.lpszClassName = L"Pixels";
+    wc.hInstance     = hInstance;
+    wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
+    wc.lpfnWndProc   = WndProc;
+    wc.hCursor       = LoadCursor(0, IDC_ARROW);
+
+    RegisterClassW(&wc);
+    CreateWindowW(wc.lpszClassName, L"Pixels",
+                WS_OVERLAPPEDWINDOW | WS_VISIBLE,
+                100, 100, 300, 250, NULL, NULL, hInstance, NULL);
+
+    while (GetMessage(&msg, NULL, 0, 0)) {
+    
+        TranslateMessage(&msg);
+        DispatchMessage(&msg);
+    }
+
+    srand(time(NULL));
+
+    return (int) msg.wParam;
+}
+
+LRESULT CALLBACK WndProc(HWND hwnd, UINT msg,
+    WPARAM wParam, LPARAM lParam) {
+
+    switch(msg) {
+
+        case WM_PAINT:
+
+            DrawPixels(hwnd);
+            break;
+
+        case WM_DESTROY:
+
+            PostQuitMessage(0);
+            return 0;
+    }
+
+    return DefWindowProcW(hwnd, msg, wParam, lParam);
+}
+
+void DrawPixels(HWND hwnd) {
+
+    PAINTSTRUCT ps;
+    RECT r;
+
+    GetClientRect(hwnd, &r);
+
+    if (r.bottom == 0) {
+    
+        return;
+    }
+
+    HDC hdc = BeginPaint(hwnd, &ps);
+
+    for (int i=0; i<1000; i++) {
+
+        int x = rand() % r.right;
+        int y = rand() % r.bottom;
+        SetPixel(hdc, x, y, RGB(255, 0, 0));
+    }
+
+    EndPaint(hwnd, &ps);
+}