使用GDI将文字旋转90度 [英] Rotate Text by 90 degrees with GDI

问题描述

我想将文本绘制到GDI曲面上，并将此文本逆时针旋转90度.我更喜欢使用DrawText绘制文本，因为它支持回车.我尝试将字体与lfEscapement一起使用(请参见下面的代码)，但是该行没有旋转-一条线被另一条线渲染.是否有可能旋转文本?还是不旋转而进行渲染并旋转整个设备上下文?

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?

常规文本布局:

旋转(期望的结果):

    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;
    }

推荐答案

   lf.lfEscapement = 90;

要使文字垂直，应该为900，单位为0.1度.

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

恐怕您打算让DrawText处理换行符的计划会陷入僵局.我无法说服它正确对齐文本.它在最后一行而不是第一行对齐.一些可玩的代码:

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);

我想我尝试了所有对齐方式.

I think I tried all alignment options.

这篇关于使用GDI将文字旋转90度的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！