使用 GDI 将文本旋转 90 度

发布于 2024-09-15 23:04:41 字数 1217 浏览 6 评论 0原文

我想将文本绘制到 GDI 表面并将该文本逆时针旋转 90 度。我更喜欢使用 DrawText 来绘制文本，因为它支持回车。我尝试使用带有 lfEscapement 的字体（请参阅下面的代码），但该线没有旋转 - 一条线渲染在另一条线之上。是否有可能旋转文本？或者在不旋转的情况下渲染并旋转整个设备上下文？

普通文本布局：

alt text

旋转（所需结果）：

替代文字

    case WM_PAINT:
    {
        hdc = BeginPaint(hWnd, &ps);

        LOGFONT lf = {0};
        HANDLE hFont;
        ZeroMemory(&lf, sizeof(LOGFONT));

        lf.lfWeight = FW_NORMAL;
        lstrcpy(lf.lfFaceName, _T("Tahoma"));
        lf.lfEscapement = 90;
        lf.lfHeight = 30;
        hFont = CreateFontIndirect (&lf);
        hFont = (HFONT)SelectObject (ps.hdc, hFont);

        RECT RectBody = {10,lf.lfHeight+10,::GetSystemMetrics(SM_CXSCREEN)-10,::GetSystemMetrics(SM_CYSCREEN)-lf.lfHeight-20};
        {
            ScopedLock lock(me->m_mutex);
            DrawText (ps.hdc, me->GetMessageString().c_str(), (int)me->GetMessageString().length(), &RectBody, 0);
        }

        hFont = (HFONT)SelectObject (ps.hdc, hFont);
        DeleteObject (hFont);

        EndPaint(hWnd, &ps);
        break;
    }

原文

I want to draw text to a GDI Surface and rotate this text by 90 degrees counter clockwise. I would prefer to use DrawText to draw the text because it supports carriage return. I tried to use a font with lfEscapement (see the code below) but the line is not rotated - one line gets rendered over the other. Is there any possibility to rotate the text? Or to render without rotation and rotate the whole device context?

Normal text layout:

alt text

Rotated (desired result):

alt text

    case WM_PAINT:
    {
        hdc = BeginPaint(hWnd, &ps);

        LOGFONT lf = {0};
        HANDLE hFont;
        ZeroMemory(&lf, sizeof(LOGFONT));

        lf.lfWeight = FW_NORMAL;
        lstrcpy(lf.lfFaceName, _T("Tahoma"));
        lf.lfEscapement = 90;
        lf.lfHeight = 30;
        hFont = CreateFontIndirect (&lf);
        hFont = (HFONT)SelectObject (ps.hdc, hFont);

        RECT RectBody = {10,lf.lfHeight+10,::GetSystemMetrics(SM_CXSCREEN)-10,::GetSystemMetrics(SM_CYSCREEN)-lf.lfHeight-20};
        {
            ScopedLock lock(me->m_mutex);
            DrawText (ps.hdc, me->GetMessageString().c_str(), (int)me->GetMessageString().length(), &RectBody, 0);
        }

        hFont = (HFONT)SelectObject (ps.hdc, hFont);
        DeleteObject (hFont);

        EndPaint(hWnd, &ps);
        break;
    }

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窗影残 2024-09-22 23:04:41

   lf.lfEscapement = 90;

文本垂直应为 900，单位为 0.1 度。

恐怕您让 DrawText 处理换行符的计划会失败。我无法说服它正确对齐文本。它对齐在最后一行，而不是第一行。一些可以使用的代码：

    wchar_t* msg = L"Hello\r\nworld";
    RECT rcMeasure = {0, 0, 400, 0};
    DrawTextEx(hdc, msg, -1, &rcMeasure, DT_CALCRECT, 0);
    RECT rcDraw = {10, 30, 10 + rcMeasure.bottom - rcMeasure.top, 30 + rcMeasure.right - rcMeasure.left };
    FillRect(hdc, &rcDraw, (HBRUSH) (COLOR_WINDOW+2));
    SetTextAlign(hdc, TA_TOP | TA_CENTER);
    DrawTextEx(hdc, msg, -1, &rcDraw, DT_BOTTOM, 0);

我想我尝试了所有对齐选项。

   lf.lfEscapement = 90;

That should be 900 to get the text vertical, units are 0.1 degrees.

Your plan to let DrawText take care of the line breaks is going to fall flat I'm afraid. I could not convince it to align the text properly. It aligns on the last line, not the first. Some code to play with:

    wchar_t* msg = L"Hello\r\nworld";
    RECT rcMeasure = {0, 0, 400, 0};
    DrawTextEx(hdc, msg, -1, &rcMeasure, DT_CALCRECT, 0);
    RECT rcDraw = {10, 30, 10 + rcMeasure.bottom - rcMeasure.top, 30 + rcMeasure.right - rcMeasure.left };
    FillRect(hdc, &rcDraw, (HBRUSH) (COLOR_WINDOW+2));
    SetTextAlign(hdc, TA_TOP | TA_CENTER);
    DrawTextEx(hdc, msg, -1, &rcDraw, DT_BOTTOM, 0);

I think I tried all alignment options.

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