Module: Tabula::Render

Defined in:
lib/tabula/pdf_render.rb

Defined Under Namespace

Classes: PageDrawerNoText

Constant Summary collapse

TRANSPARENT_WHITE =

ugh jruby; suppresses “ambiguous method” warning that arises due to Java’s overloaded constructor.

java.awt.Color.java_class.constructor(Java::int, Java::int, Java::int, Java::int).new_instance(255, 255, 255, 0)

Class Method Summary collapse

Class Method Details

.pageToBufferedImage(page, width = 2048, pageDrawerClass = PageDrawerNoText) ⇒ Object

2048 width is important, if this is too small, thin lines won’t be drawn.



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# File 'lib/tabula/pdf_render.rb', line 25

def self.pageToBufferedImage(page, width=2048, pageDrawerClass=PageDrawerNoText)
  cropbox = page.findCropBox
  widthPt, heightPt = cropbox.getWidth, cropbox.getHeight
  pageDimension = Dimension.new(widthPt, heightPt)
  rotation = java.lang.Math.toRadians(page.findRotation)

  scaling = width / (rotation == 0 ? widthPt : heightPt)
  widthPx, heightPx = (java.lang.Math.java_send :round, [Java::float], widthPt * scaling ), (java.lang.Math.java_send :round, [Java::float], heightPt * scaling)


  retval = if rotation != 0
             BufferedImage.new(heightPx, widthPx, BufferedImage::TYPE_BYTE_GRAY)
           else
             BufferedImage.new(widthPx, heightPx, BufferedImage::TYPE_BYTE_GRAY)
           end
  graphics = retval.getGraphics()
  graphics.setBackground(TRANSPARENT_WHITE)
  graphics.clearRect(0, 0, retval.getWidth, retval.getHeight)
  if rotation != 0
    graphics.java_send :translate, [Java::int, Java::int], retval.getWidth, 0.0
    graphics.rotate(rotation)
  end
  graphics.scale(scaling, scaling)
  drawer = pageDrawerClass.new()
  drawer.drawPage(graphics,  page, pageDimension)
  graphics.dispose

  return retval
end