涉及函数(后续在函数板块补充)：

  1. SetPixel
  2. MoveToEx
  3. LineTo
  4. GetCurrentPositionEx
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LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	HDC hdc;
	PAINTSTRUCT ps;
	RECT rect;
	int i, j;
	POINT current_pos;
	TCHAR szBuffer[128];

	switch (message)
	{
	case WM_PAINT:
		hdc = BeginPaint(hwnd, &ps);
		GetClientRect(hwnd, &rect);

		/*	第一种：靠循环在每个点位画点
		for (i = rect.left; i < rect.right; ++i)
			SetPixel(hdc, i, 100, RGB(255, 0, 0));*/

		/*	第二种：使用API函数 
		MoveToEx(hdc, 100, 100, NULL);
		LineTo(hdc, 600, 100);
		GetCurrentPositionEx(hdc, &current_pos);	// 获取当前绘点位置
		StringCchPrintf(szBuffer, 128, TEXT("当前绘点位置为: (%d, %d)"), current_pos.x, current_pos.y);
		DrawText(hdc, szBuffer, -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);*/

		/* 利用API函数设计网格
		// 画横线
		for (i = 0; i <= rect.bottom; i += 50)
		{
			MoveToEx(hdc, rect.left, i, NULL);
			LineTo(hdc, rect.right, i);
		}
		// 画竖线
		for (j = 0; j <= rect.right; j += 50)
		{
			MoveToEx(hdc, j, rect.top, NULL);
			LineTo(hdc, j, rect.bottom);
		}*/

		// 画五角星, emm有点丑陋
		MoveToEx(hdc, 300, 100, NULL);
		LineTo(hdc, 200, 500);
		LineTo(hdc, 500, 200);
		LineTo(hdc, 100, 200);
		LineTo(hdc, 400, 500);
		LineTo(hdc, 300, 100);
		
		EndPaint(hwnd, &ps);
		return 0;
	case WM_DESTROY:
		PostQuitMessage(0); // 正式关闭窗口
		return 0;
	}

	return DefWindowProc(hwnd, message, wParam, lParam);
}