载波:如果尺寸大于(按条件创建版本),则缩放图像 [英] Carrierwave: Scale image if the size is larger than (conditionally create versions)
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问题描述
仅当图像大于版本大小时,才可以使用carrierwave创建一个版本(例如,拇指)?
Is possible with carrierwave create a version (for example thumb) only if the image is larger than the size of the version??
示例:
version :thumb, :if => :is_thumbnable? do
process :resize_to_fit => [32,nil]
end
protected
def is_thumbnable?(file)
image ||= MiniMagick::Image.open(file.path)
if image.nil?
if image['width'] >= 32 || image['height'] >= 32
true
else
false
end
else
false
end
end
推荐答案
我定义了一种方法,如果图像超出给定宽度,则在这种情况下,请将其调整为您的32像素大小。将此代码放在ImageUploader中:
I defined method in which if image exceed given width then manipulate it to your size the 32 pixels in this case. Put this code in your ImageUploader:
version :thumb do
process :resize_to_width => [32, nil]
end
def resize_to_width(width, height)
manipulate! do |img|
if img[:width] >= width
img.resize "#{width}x#{img[:height]}"
end
img = yield(img) if block_given?
img
end
end
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