我已经搜索过并且尝试自己解决问题,但未能找到解决方案。当用户上传照片时,如果其超出了我的最小和最大尺寸,则希望将其调整大小。但是我想要两个条件。拍摄横向(东/西)的照片应保持在我设置的尺寸范围内,竖向(北/南)拍摄的照片也是如此。
例如,如果用户上传一张长边呈现的照片,其尺寸为3264x1840。则应将其调整为584x329以适应上传。如果上传文件小于584x329,则不会调整其大小。
另一个例子是,如果用户上传了一张竖着拍摄的照片,其尺寸为2448 x 3264。则应将其调整为247x329。
我试图使用MiniMagick实现这一点,因为我相信那是必需品。如果只能使用CarrierWave那就太好了,但我认为MiniMagick是用于调整图片大小的。
我收到的错误是“undefined method resize' for #<ImageUploader:0x007f8606feb9b8>'”,并指向控制器中的
@photo = Photo.new(params[:photo])
的def create。
顺便说一下,这些尺寸很高,因为这些通常是您上传照片时手机的默认尺寸。
image_uploader.rb:
class ImageUploader < CarrierWave::Uploader::Base
include CarrierWave::MiniMagick
storage :file
# storage :fog
# Override the directory where uploaded files will be stored.
# This is a sensible default for uploaders that are meant to be mounted:
def store_dir
"uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
end
process :resize => [584, 329]
def resize_to_limit(width, height)
manipulate! do |img|
img.resize "#{width}x#{height}>"
img = yield(img) if block_given?
img
end
end
# Create different versions of your uploaded files:
version :thumb do
process :resize_to_limit => [200, 200]
end
end
照片控制器:
def create
@photo = Photo.new(params[:photo])
@photo.user = current_user
if @photo.save
flash[:notice] = "Successfully created photos."
redirect_to :back
else
render :action => 'new'
end
end
def resize(width, height, gravity = 'Center')
manipulate! do |img|
img.combine_options do |cmd|
cmd.resize "#{width}"
if img[:width] < img[:height]
cmd.gravity gravity
cmd.background "rgba(255,255,255,0.0)"
cmd.extent "#{width}x#{height}"
end
end
img = yield(img) if block_given?
img
end
end