Question

我用Rmagick裁剪图片然后用Prawn显示

以下是代码：

首先使用RMagick实例化图像的方法：

def build_magick_image(path)
    if path.instance_of?(StringIO)
      Magick::Image.from_blob(path.read)
    else
      Magick::Image.read(path)
    end.first
end

在我的情况下，我有一个StringIO实例。然后我裁剪图片：

img = build_magick_image(picture_path)
cropped_img = img.resize_to_fill(1735, 1560)

但现在我无法找到如何在我的Prawn pdf中显示它。我的最后一次尝试是：

pdf.image cropped_img, at: [image_x, image_y], height: image_height.mm , width: inner_page_width.mm

但显然它不起作用。

有人可以帮助我吗？

谢谢：）

Answer 1

当我试图弄清楚同一件事时，我发现了您的问题?这是我想出的解决方案：

将图像斑点包装在pgloader -D ./ -L load.log scripts/load-channel-tags.load 2020-03-06T19:24:27.015000Z LOG pgloader version "3.6.1" 2020-03-06T19:24:27.024000Z LOG Data errors in '/tmp/' 2020-03-06T19:24:27.024000Z LOG Parsing commands from file #P"/tmp/load-identifer-table.load" ; in: LAMBDA (PGLOADER.SOURCES::ROW) ; (VECTOR PGLOADER.USER-SYMBOLS::CREATED PGLOADER.USER-SYMBOLS::UPDATED ; PGLOADER.USER-SYMBOLS::ID PGLOADER.USER-SYMBOLS::GEO_ID ; PGLOADER.USER-SYMBOLS::REFERENCE_ID PGLOADER.USER-SYMBOLS::TAGGED_BY) ; --> MAKE-ARRAY MAKE-ARRAY LOCALLY ; ==> ; (VECTOR PGLOADER.USER-SYMBOLS::CREATED PGLOADER.USER-SYMBOLS::UPDATED ; PGLOADER.USER-SYMBOLS::ID PGLOADER.USER-SYMBOLS::GEO_ID ; PGLOADER.USER-SYMBOLS::REFERENCE_ID PGLOADER.USER-SYMBOLS::TAGGED_BY) ; ; caught WARNING: ; undefined variable: PGLOADER.USER-SYMBOLS::ID ; ; caught WARNING: ; undefined variable: PGLOADER.USER-SYMBOLS::TAGGED_BY ; ; compilation unit finished ; Undefined variables: ; PGLOADER.USER-SYMBOLS::ID PGLOADER.USER-SYMBOLS::TAGGED_BY ; caught 2 WARNING conditions 2020-03-06T19:24:27.398000Z WARNING Target table "\"public\".\"identifier_reference\"" has 2 indexes defined against it. 2020-03-06T19:24:27.398000Z WARNING That could impact loading performance badly. 2020-03-06T19:24:27.398000Z WARNING Consider the option 'drop indexes'. 2020-03-06T19:24:27.446000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.447000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.447000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.447000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.447000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.447000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.447000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.447000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.447000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.447000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.447000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.447000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.448000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.448000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.448000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.448000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.448000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.448000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.448000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.449000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.449000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.449000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.449000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.450000Z ERROR Could not read input: The variable PGLOADER.USER-SYMBOLS::ID is unbound. 2020-03-06T19:24:27.468000Z LOG report summary reset table name errors rows bytes total time ----------------------- --------- --------- --------- -------------- fetch 0 0 0.008s ----------------------- --------- --------- --------- -------------- "public"."channel_tag" 24 0 0.066s ----------------------- --------- --------- --------- -------------- Files Processed 0 1 0.023s COPY Threads Completion 0 2 0.102s ----------------------- --------- --------- --------- -------------- Total import time 24 0 0.125s对象中，这将为Prawn提供所需的接口。在您的特定情况下：

                                        Table "public.identifier_reference"
    Column    |           Type           | Collation | Nullable |                 Default                 
--------------+--------------------------+-----------+----------+-----------------------------------------
 created      | timestamp with time zone |           |          | 
 updated      | timestamp with time zone |           |          | 
 id           | integer                  |           | not null | nextval('identifier_reference_id_seq'::regclass)
 geo_id       | character varying        |           | not null | 
 reference_id | integer                  |           | not null | 
 tagged_by    | character varying        |           |          | 
Indexes:
    "identifier_reference_pkey" PRIMARY KEY, btree (id)
    "identifier_reference_ids_unique_cons" UNIQUE CONSTRAINT, btree (string_identifier, reference_id)
Foreign-key constraints:
    "identifier_reference_geo_id_fkey" FOREIGN KEY (geo_id) REFERENCES geo(id)
    "identifier_reference_reference_id_fkey" FOREIGN KEY (reference_id) REFERENCES reference(id)

Prawn pdf 2和Rmagick

1 个答案: