winapi - win32-如何在文本字符串周围绘制矩形？

Question

我是Win32的新手，并尝试在C++中获取基于GDI的代码(出于技术原因，不想使用GDI +)

编辑:简化问题:

我需要在窗口中间绘制的文本周围绘制一个矩形。
-如何填充矩形坐标？
-有人可以帮忙吗-Rectangle(x1，y1，x2，y2)？ -如何计算这些(x1，y1)和(x2，y2)值？

谢谢..

        hdc = BeginPaint(hWnd, &ps);
    GetClientRect(hWnd, &rcClient);
    SelectObject(hdc, GetStockObject(DEFAULT_GUI_FONT));
    SetTextColor(hdc, RGB(255, 0, 0));

    DrawText(hdc, wstring(s.begin(),s.end()).c_str(), -1, &rectResult, DT_SINGLELINE | DT_CALCRECT);

    DrawText(hdc, wstring(s.begin(),s.end()).c_str(), -1, &rcClient, DT_SINGLELINE | DT_CENTER | DT_VCENTER);

    // Here I need help - How to I place the rectangle around the Text - which is drawn in the middle of the window?
    // It looks like need to use - rectResult.bottom/top/left/right - but don't know how.. 
    Rectangle(hdc, 0,0,100,100);   

Answer 1

您实际上不必自己将文本居中。如果传递适当的标志，则GDI文本输出功能可以为您完成此操作。

例如，如果调用 DrawText 并传递DT_CENTER标志，它将自动在指定矩形的中间(水平居中)绘制文本。

假设您只有一行文本(听起来像您这样)，则可以通过传递DT_SINGLELINE和DT_VCENTER标志来使其自动垂直居中。

因此，您真正要做的就是编写代码将your window's client area分成4个相等的部分，然后将这些矩形传递给DrawText函数。这并不困难。如果无法在头上看到铅笔和纸，可以在上面放铅笔和纸。

void PaintWindow(HWND hWnd)
{
   // Set up the device context for drawing.
   PAINTSTRUCT ps;
   HDC hDC = BeginPaint(hWnd, &ps);
   HPEN hpenOld = static_cast<HPEN>(SelectObject(hDC, GetStockObject(DC_PEN)));
   HBRUSH hbrushOld = static_cast<HBRUSH>(SelectObject(hDC, GetStockObject(NULL_BRUSH)));

   // Calculate the dimensions of the 4 equal rectangles.
   RECT rcWindow;
   GetClientRect(hWnd, &rcWindow);

   RECT rc1, rc2, rc3, rc4;
   rc1 = rc2 = rc3 = rc4 = rcWindow;

   rc1.right  -= (rcWindow.right - rcWindow.left) / 2;
   rc1.bottom -= (rcWindow.bottom - rcWindow.top) / 2;

   rc2.left   = rc1.right;
   rc2.bottom = rc1.bottom;

   rc3.top   = rc1.bottom;
   rc3.right = rc1.right;

   rc4.top  = rc1.bottom;
   rc4.left = rc1.right;

   // Optionally, deflate each of the rectangles by an arbitrary amount so that
   // they don't butt up right next to each other and we can distinguish them.
   InflateRect(&rc1, -5, -5);
   InflateRect(&rc2, -5, -5);
   InflateRect(&rc3, -5, -5);
   InflateRect(&rc4, -5, -5);

   // Draw (differently-colored) borders around these rectangles.
   SetDCPenColor(hDC, RGB(255, 0, 0));    // red
   Rectangle(hDC, rc1.left, rc1.top, rc1.right, rc1.bottom);
   SetDCPenColor(hDC, RGB(0, 255, 0));    // green
   Rectangle(hDC, rc2.left, rc2.top, rc2.right, rc2.bottom);
   SetDCPenColor(hDC, RGB(0, 0, 255));    // blue
   Rectangle(hDC, rc3.left, rc3.top, rc3.right, rc3.bottom);
   SetDCPenColor(hDC, RGB(255, 128, 0));  // orange
   Rectangle(hDC, rc4.left, rc4.top, rc4.right, rc4.bottom);

   // Draw the text into the center of each of the rectangles.
   SetBkMode(hDC, TRANSPARENT);
   SetBkColor(hDC, RGB(0, 0, 0));   // black
   // TODO: Optionally, set a nicer font than the default.
   DrawText(hDC, TEXT("Hello World!"), -1, &rc1, DT_CENTER | DT_SINGLELINE | DT_VCENTER);
   DrawText(hDC, TEXT("Hello World!"), -1, &rc2, DT_CENTER | DT_SINGLELINE | DT_VCENTER);
   DrawText(hDC, TEXT("Hello World!"), -1, &rc3, DT_CENTER | DT_SINGLELINE | DT_VCENTER);
   DrawText(hDC, TEXT("Hello World!"), -1, &rc4, DT_CENTER | DT_SINGLELINE | DT_VCENTER);

   // Clean up after ourselves.
   SelectObject(hDC, hpenOld);
   SelectObject(hDC, hbrushOld);
   EndPaint(hWnd, &ps);
}