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Questions about Android development and PDF
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Added JPEG not appearing 3 weeks 6 hours ago #15533

  • arlomedia
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Great, now the JPEG appears! And I can use this matrix to show it full-page:
Matrix(pageWidth.toFloat(), pageHeight.toFloat(), 0f, 0f)

Can I also use the matrix to rotate the image? I'm using this matrix to rotate annotations 90 degrees:
Matrix(0f, 1f, -1f, 0f, pageHeight.toFloat(), 0f)

But when I use that in the content.GSSetMatrix function above, the image doesn't appear. Even with this default matrix that doesn't do any rotation, the image doesn't appear:
Matrix(1f, 0f, 0f, 1f, 0f, 0f)

How do you recommend adding rotation to the code above?

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Added JPEG not appearing 2 weeks 6 days ago #15534

  • radaee
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the code:
Matrix(0f, 1f, -1f, 0f, pageHeight.toFloat(), 0f)
can only display 1 pixel on PDF page, you shall passs
Matrix(0f, height, -width, 0f, pageHeight.toFloat(), 0f)
 

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Added JPEG not appearing 2 weeks 6 days ago #15535

  • arlomedia
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Oh, got it. For the record, this rotated the image 90 degrees counterclockwise:
Matrix(0f, height, -width, 0f, width, 0f)

And this rotated 90 degrees clockwise:
Matrix(0f, -height, width, 0f, 0f, height)

I have everything working as intended now. Thanks!

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