在emacs doc-view-mode中旋轉文檔

Question

我有一個文檔顯示在文檔視圖緩衝區中。但是，文檔左旋90度。我可以在emacs doc-view中旋轉文檔嗎？

Answer 1

我也有這個要求。可悲doc-view不提供此功能。

此外，emacs使用的圖像代碼無法旋轉圖像。所以，我創建了利用ImageMagick變換存儲在緩存目錄的PNG文件並重新顯示當前頁面的函數：

(defun doc-view-rotate-current-page() 
    "Rotate the current page by 90 degrees. Requires ImageMagick installation" 
    (interactive) 
    (when (eq major-mode 'doc-view-mode) 
    ;; we are assuming current doc-view internals about cache-names 
    (let ((file-name (expand-file-name (format "page-%d.png" (doc-view-current-page)) (doc-view--current-cache-dir)))) 
     ;; assume imagemagick is installed and rotate file in-place and redisplay buffer 
     (call-process-shell-command "convert" nil nil nil "-rotate" "90" (concat "\"" file-name "\"") (concat "\"" file-name "\"")) 
     (clear-image-cache) 
     (doc-view-goto-page (doc-view-current-page))))))