mirror of https://github.com/koreader/koreader
add manual page crop for pdf/djvu documents
chrox
11 years ago
parent
ddfe5ca3a9
commit
a1aa41136c
@ -0,0 +1,198 @@
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--[[
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BBoxWidget shows a bbox for page cropping
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]]
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BBoxWidget = InputContainer:new{
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page_bbox = nil,
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screen_bbox = nil,
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linesize = 2,
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}
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function BBoxWidget:getSize()
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return Geom:new{
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x = 0, y = 0,
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w = Screen:getWidth(),
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h = Screen:getHeight()
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}
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end
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function BBoxWidget:paintTo(bb, x, y)
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self.screen_bbox = self.screen_bbox or self:page_to_screen()
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local bbox = self.screen_bbox
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-- upper_left
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bb:invertRect(bbox.x0 + self.linesize, bbox.y0, bbox.x1 - bbox.x0, self.linesize)
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bb:invertRect(bbox.x0, bbox.y0, self.linesize, bbox.y1 - bbox.y0 + self.linesize)
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-- bottom_right
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bb:invertRect(bbox.x0 + self.linesize, bbox.y1, bbox.x1 - bbox.x0 - self.linesize, self.linesize)
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bb:invertRect(bbox.x1, bbox.y0 + self.linesize, self.linesize, bbox.y1 - bbox.y0)
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end
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-- transform page bbox to screen bbox
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function BBoxWidget:page_to_screen()
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local bbox = {}
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local scale = self.crop.zoom
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local screen_offset = self.crop.screen_offset
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DEBUG("screen offset in page_to_screen", screen_offset)
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bbox.x0 = self.page_bbox.x0 * scale + screen_offset.x
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bbox.y0 = self.page_bbox.y0 * scale + screen_offset.y
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bbox.x1 = self.page_bbox.x1 * scale + screen_offset.x
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bbox.y1 = self.page_bbox.y1 * scale + screen_offset.y
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return bbox
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end
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-- transform screen bbox to page bbox
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function BBoxWidget:screen_to_page()
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local bbox = {}
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local scale = self.crop.zoom
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local screen_offset = self.crop.screen_offset
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DEBUG("screen offset in screen_to_page", screen_offset)
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bbox.x0 = self.screen_bbox.x0 / scale - screen_offset.x
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bbox.y0 = self.screen_bbox.y0 / scale - screen_offset.y
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bbox.x1 = self.screen_bbox.x1 / scale - screen_offset.x
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bbox.y1 = self.screen_bbox.y1 / scale - screen_offset.y
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return bbox
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end
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function BBoxWidget:oddEven(number)
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if number % 2 == 1 then
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return "odd"
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else
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return "even"
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end
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end
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function BBoxWidget:init()
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if Device:isTouchDevice() then
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self.ges_events = {
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AdjustCrop = {
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GestureRange:new{
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ges = "tap",
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range = Geom:new{
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x = 0, y = 0,
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w = Screen:getWidth(),
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h = Screen:getHeight()
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}
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}
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},
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ConfirmCrop = {
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GestureRange:new{
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ges = "double_tap",
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range = Geom:new{
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x = 0, y = 0,
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w = Screen:getWidth(),
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h = Screen:getHeight()
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}
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}
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},
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CancelCrop = {
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GestureRange:new{
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ges = "hold_release",
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range = Geom:new{
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x = 0, y = 0,
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w = Screen:getWidth(),
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h = Screen:getHeight()
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}
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}
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},
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}
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end
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end
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function BBoxWidget:onGesture(ev)
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for name, gsseq in pairs(self.ges_events) do
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for _, gs_range in ipairs(gsseq) do
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--DEBUG("gs_range", gs_range)
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if gs_range:match(ev) then
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local eventname = gsseq.event or name
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return self:handleEvent(Event:new(eventname, ev.pos))
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end
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end
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end
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end
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function BBoxWidget:onAdjustCrop(pos)
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DEBUG("adjusting crop bbox with pos", pos)
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local bbox = self.screen_bbox
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local upper_left = Geom:new{ x = bbox.x0, y = bbox.y0}
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local bottom_right = Geom:new{ x = bbox.x1, y = bbox.y1}
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if upper_left:distance(pos) < bottom_right:distance(pos) then
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upper_left.x = pos.x
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upper_left.y = pos.y
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else
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bottom_right.x = pos.x
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bottom_right.y = pos.y
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end
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self.screen_bbox = {
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x0 = upper_left.x,
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y0 = upper_left.y,
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x1 = bottom_right.x,
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y1 = bottom_right.y
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}
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UIManager.repaint_all = true
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end
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function BBoxWidget:onConfirmCrop()
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self.page_bbox = self:screen_to_page()
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--DEBUG("new bbox", self.page_bbox)
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UIManager:close(self)
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self.ui:handleEvent(Event:new("BBoxUpdate"), self.page_bbox)
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self.document.bbox[self.pageno] = self.page_bbox
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self.document.bbox[self:oddEven(self.pageno)] = self.page_bbox
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self.ui:handleEvent(Event:new("SetZoomMode", self.orig_zoom_mode))
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self.document.configurable.text_wrap = self.orig_reflow_mode
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UIManager.repaint_all = true
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end
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ReaderCropping = InputContainer:new{}
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function ReaderCropping:onPageCrop(mode)
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if mode == "auto" then return end
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local orig_reflow_mode = self.document.configurable.text_wrap
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self.document.configurable.text_wrap = 0
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self.ui:handleEvent(Event:new("CloseConfig"))
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self.ui:handleEvent(Event:new("SetZoomMode", "page"))
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local ubbox = self.document:getPageBBox(self.current_page)
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--DEBUG("used page bbox", ubbox)
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self.crop_bbox = BBoxWidget:new{
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page_bbox = ubbox,
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ui = self.ui,
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crop = self,
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document = self.document,
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pageno = self.current_page,
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orig_zoom_mode = self.orig_zoom_mode,
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orig_reflow_mode = orig_reflow_mode,
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}
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UIManager:show(self.crop_bbox)
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return true
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end
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function ReaderCropping:onPageUpdate(page_no)
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--DEBUG("page updated to", page_no)
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self.current_page = page_no
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end
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function ReaderCropping:onZoomUpdate(zoom)
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--DEBUG("zoom updated to", zoom)
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self.zoom = zoom
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end
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function ReaderCropping:onScreenOffsetUpdate(screen_offset)
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--DEBUG("offset updated to", screen_offset)
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self.screen_offset = screen_offset
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end
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function ReaderCropping:onSetZoomMode(mode)
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if self.orig_zoom_mode == nil then
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--DEBUG("backup zoom mode", mode)
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self.orig_zoom_mode = mode
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end
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end
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function ReaderCropping:onReadSettings(config)
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local bbox = config:readSetting("bbox")
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self.document.bbox = bbox
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DEBUG("read document bbox", self.document.bbox)
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end
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function ReaderCropping:onCloseDocument()
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self.ui.doc_settings:saveSetting("bbox", self.document.bbox)
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end
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