win32 - 如何圍繞文本字符串繪製矩形？

Question

我是新來的Win32並試圖獲得在C基於GDI ++編寫代碼（由於技術原因不希望使用GDI +）

編輯：簡單求的問題：

我需要周圍繪製一個矩形在窗口中間繪製的文本。 - 如何填充矩形座標？ - 任何人可以幫助行 - 矩形（x1，y1，x2，y2）？ - 如何計算這些（x1，y1）&（x2，y2）的值？

謝謝。

 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

你實際上並不需要自己居中文本。如果您傳遞適當的標誌，GDI文本輸出功能可以爲您做到這一點。

例如，如果您調用DrawText並通過DT_CENTER標誌，它將自動在指定的矩形（水平居中）中間繪製文本。

假設你只有文本（這聽起來像你這樣做）的單行線，你可以讓它自動垂直中心通過傳遞DT_SINGLELINE和DT_VCENTER標誌的文本。

所以你所要做的就是編寫代碼將your window's client area分成4等份，然後將這些矩形傳遞給DrawText函數。這並不困難。如果你不能在頭腦中想象它，請將鉛筆和紙放在它上面。

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); 
} 

 

Answer 2

RECT rect={0,0,0,0}; 
const char *str="Test Text"; 
DrawText(hDC, str, strlen(str), &rect, DT_CALCRECT | DT_NOCLIP); 
Rectangle(hDC,rect.left,rect.top,rect.right,rect.bottom); 
DrawText(hDC, str, strlen(str), &rect, DT_CENTER | DT_VCENTER | DT_SINGLELINE|DT_NOCLIP); 

Answer 3

得到它終於:)非常感謝科迪灰色指着我在正確的方向這個:)

GetTextExtentPoint32(hDC, str, strlen(str), &sz2); 
rect2.top=rect2.bottom+sz2.cy; 
rect2.right=rect2.top+sz2.cx; 
Rectangle(hDC,rect2.left,rect2.top,rect2.right,rect2.bottom); 
DrawText(hDC, str, -1, &rect2, DT_CENTER | DT_VCENTER | DT_SINGLELINE|DT_NOCLIP);