Crop selected document area into a Bitmap

alecrugar
Topic Author
Offline
New Member

IP: 192.168.0.71 8 years 2 months ago #13112 by alecrugar

Crop selected document area into a Bitmap was created by alecrugar

I want to draw a Rect (as a Rect Annotation) and crop the selected area of the PDF Document into a Bitmap.

for that I'm using this function that I got from this link:
www.radaeepdf.com/forum/Android-developm...f-a-page-to-a-bitmap

Code:

public Bitmap getBitmapForRect(Rect rect) {
        int width = rect.right - rect.left;
        int height = rect.bottom - rect.top;
        float pageWidth = m_doc.GetPageWidth(m_pageno);
        float pageHeight = m_doc.GetPageHeight(m_pageno);

        float scaleX = (float)pageWidth / (float)m_doc.GetPageWidth(m_pageno);
        float scaleY = -scaleX;
        float originX = -rect.left;
        float originY = pageHeight - rect.top;

        Matrix matrix = new Matrix(scaleX, scaleY, originX, originY);
        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        m_view.vGetPage(m_pageno).GetPage().RenderToBmp(bitmap, matrix);
        matrix.Destroy();

        return bitmap;
    }

But how do I get the Rect contained in the selected area of the Annotation?
Thanks.

nermeen
Offline
Platinum Member

IP: 192.168.0.71 8 years 2 months ago #13117 by nermeen

Replied by nermeen on topic Crop selected document area into a Bitmap

To get the rect of the annotation (type rectangle), you need to use:

Code:

Annotation.GetRect:
/**
		 * get annotation's box rectangle.<br/>
		 * this method require professional or premium license
		 * @return 4 elements: left, top, right, bottom in PDF coordinate system
		 */
        final public float[] GetRect()

And then pass the rect to the above method.
If this is not what you are asking for, can you please explain with details?

radaee
Offline
Platinum Member

IP: 192.168.0.71 8 years 2 months ago #13120 by radaee

Replied by radaee on topic Crop selected document area into a Bitmap

Hi, if you want get bitmap of annotation, you can try Annotation.Render

alecrugar
Topic Author
Offline
New Member

IP: 192.168.0.71 8 years 2 months ago #13121 by alecrugar

Replied by alecrugar on topic Crop selected document area into a Bitmap

Hi,
thanks a lot for your answers.
The problem I have is that I don't know which one is the right Annotation I have to select.
For example after I add a Rect annotation, the OnPageDisplayed(Canvas canvas, PDFVPage vpage) method is called, returning the PDFVPage. I can access the annotation via vpage.GetPage().GetAnnot() but there are always more than one. If I do --> vpage.GetPage().GetAnnot(index).GetRect(), the coordinates returned are not right because the cropped area is different to the selected area with the Rect Annotation.

Thanks a lot for your time.

Alejandro.

nermeen
Offline
Platinum Member

IP: 192.168.0.71 8 years 2 months ago #13122 by nermeen

Replied by nermeen on topic Crop selected document area into a Bitmap

You can get the last added annotation using:

Code:

Page.GetAnnot(page.GetAnnotCount() - 1)

You can also validate the annotation type:

Code:

Annotation.GetType == 5 //for rectangle annotation

Note that: the GetRect returns the values into PDF coordinates, you need to convert them to view coordinates

Code:

m_annot_rect = m_annot.GetRect();
float tmp = m_annot_rect[1];
m_annot_rect[0] = m_annot_page.GetVX(m_annot_rect[0]) - m_layout.vGetX();
m_annot_rect[1] = m_annot_page.GetVY(m_annot_rect[3]) - m_layout.vGetY();
m_annot_rect[2] = m_annot_page.GetVX(m_annot_rect[2]) - m_layout.vGetX();
m_annot_rect[3] = m_annot_page.GetVY(tmp) - m_layout.vGetY();

alecrugar
Topic Author
Offline
New Member

IP: 192.168.0.71 8 years 2 months ago #13125 by alecrugar

Replied by alecrugar on topic Crop selected document area into a Bitmap

That's it!

Thanks a lot

Time to create page: 0.467 seconds