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TOPIC: Eraser of PDF Ink

Eraser of PDF Ink 4 years 10 months ago #4865

  • el3ony
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Hi,

Is there a way how to make an eraser? After I painted any color on PDF I don't know how to paint the transparency color to erase the ink that I painted before.

I already tried with these snippet code but it doesn't work

paint.setColor(Color.TRANSPARENT);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));


any reply would be appreciate

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Eraser of PDF Ink 4 years 10 months ago #4866

  • radaee
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delete the Ink object.
if Ink object not added to page by Page.AddAnnotInk().
just invoke Ink.destroy(), and set Ink object to null.

if Ink objecy was added to page.
then invoke Annotation.RemoveFromPage() or Annotation.SetHide()

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Eraser of PDF Ink 4 years 10 months ago #4867

  • el3ony
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Thanks but this is not what I want

Ink.destroy(), and set Ink object to null
Annotation.RemoveFromPage(), Annotation.SetHide()

These code uses for remove all of the Ink object but I want to remove some part of the ink object,
in this case the rubber to rub some part of the Ink.

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Eraser of PDF Ink 4 years 10 months ago #4868

  • radaee
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i think, in this case.
you can create your owner Ink class to descript editable cache.

and the Ink class(you defined) can translate to Ink(com.radaee.pdf.Ink).
then add translated Ink object to Page, if needed.

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Eraser of PDF Ink 4 years 10 months ago #4869

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an other way is:
create a Bitmap object over page, when Ink drawn.
and eraser write transparent color to Bitmap object for coordinate(not draw, but set pixels value).

after all, then clip bonding box to all object, and get a smaller bitmap object.
then add the bitmap object to page by Page.AddAnnotBitmap or Page.AddContent

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Eraser of PDF Ink 4 years 10 months ago #4870

  • el3ony
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Thank I'll try and get back to you.

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