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PDF free zoom mode revisit

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this should implement feature request of zoom mode for multi-columns
page in #501
This PR depends on koreader/koreader-base#435

How to use?
1. Tap the top left corner of a PDF/Djvu page to get into the flipping
mode
2. Double-tap on text block will zoom in to that column
3. Double-tap on any area will zoom out to an overview of the page
4. repeat step 2 to focus to another page block

How does it work?
1. We first find the mask of text blocks in the page. (Pic 1)
2. Then we intersect page boxes with user tap to form a page block. (Pic 2)
3. Finally we zoom the page to the page block and center current view to
that block. (Pic 3)
This commit is contained in:
chrox
2016-06-15 01:50:59 +08:00
parent 22d0dbfb4f
commit 5983050d79
9 changed files with 47 additions and 45 deletions
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4
frontend/document/djvudocument.lua
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@@ -69,8 +69,8 @@ function DjvuDocument:getOCRText(pageno, tboxes)
return self.koptinterface:getOCRText(self, pageno, tboxes)
end
function DjvuDocument:getPageRegions(pageno)
return self.koptinterface:getPageRegions(self, pageno)
function DjvuDocument:getPageBlock(pageno, x, y)
return self.koptinterface:getPageBlock(self, pageno, x, y)
end
function DjvuDocument:getUsedBBox(pageno)