--- return a table of names associated with decorator symbols
-function decorator_names(model)
- local sheets = model.doc:sheets()
- local symbols = sheets:allNames("symbol")
- local res = {}
- for _, name in pairs(symbols) do
- if name:find("deco/") == 1 then
- res[#res + 1] = name
- end
+-- Helper for compatibility with different ipe-versions.
+function mainWindow(model)
+ if model.ui.win == nil then
+ return model.ui
+ else
+ return model.ui:win()
end
- return res
end
--- Decorate something given by its bounding box with a given deco
--- object, which needs to be a path.
-function decorate(model, bbox, deco)
- if (deco:type() ~= "path") then
- model.ui:explain("The decoration needs to be a path.")
- return
- end
+-- Changes the transformation matrix of a path object to the identitiy
+-- matrix without canging the appearance of the object (i.e., the
+-- transformation matrix is applied to the objects shape)
+function cleanup_matrix(path_obj)
+ local matrix = path_obj:matrix()
+ local matrix_func = function (point) return matrix end
+ local shape = path_obj:shape()
+ transform_shape(shape, matrix_func)
+ path_obj:setShape(shape)
+ path_obj:setMatrix(ipe.Matrix())
+end
- local shape = deco:shape()
+-- Transform a shape by transforming every point using a matrix
+-- returend by matrix_func. The function matrix_func should take a
+-- point and return a matrix (that is then used to transform this
+-- point).
+--
+-- Arcs are also transformed.
+function transform_shape(shape, matrix_func)
for _,path in pairs(shape) do
- for _,subpath in ipairs(path) do
- -- move all points
+ for _,subpath in ipairs(path) do
+ -- apply to every point
for i,point in ipairs(subpath) do
- subpath[i] = translation(bbox, point) * point
+ subpath[i] = matrix_func(point) * point
end
- -- for acs, the center must be translated separately
+ -- apply to arcs
if (subpath["type"] == "arc") then
local arc = subpath["arc"]
- local arc_pos = arc:matrix():translation()
- subpath["arc"] = translation(bbox, arc_pos) * arc
+ local center = arc:matrix():translation()
+ subpath["arc"] = matrix_func(center) * arc
end
end
end
- -- update model
- deco:setShape(shape)
- model:creation("create", deco)
end
--- The translation matrix that should be applied to a given point when
--- doing the decoration.
-function translation(bbox, point)
- local dx = 0
- local dy = 0
- if (point.x > 0) then
- dx = dx + bbox:width()
+-- Resizes a given shape such that the same transformation also
+-- transforms bbox_source to bbox_target. The transformation is done
+-- by translating points of the shape such that all points in the same
+-- quadrant with respect to center are translated in the same way.
+--
+-- Clearly, the center has to lie inside bbox_source.
+function resize_shape(shape, center, bbox_source, bbox_target)
+ -- assert that the center lies inside bbox_source
+ assert(bbox_source:left() < center.x)
+ assert(center.x < bbox_source:left() + bbox_source:width())
+ assert(bbox_source:bottom() < center.y)
+ assert(center.y < bbox_source:bottom() + bbox_source:height())
+
+ -- translation of points to the left/right/top/bottom of the center
+ local dx_left = bbox_target:left() - bbox_source:left()
+ local dy_bottom = bbox_target:bottom() - bbox_source:bottom()
+ local dx_right = bbox_target:width() - bbox_source:width()
+ local dy_top = bbox_target:height() - bbox_source:height()
+
+ -- transformation
+ local matrix_func = function (point)
+ local dx = dx_left
+ local dy = dy_bottom
+ if (center.x < point.x) then dx = dx + dx_right end
+ if (center.y < point.y) then dy = dy + dy_top end
+ return ipe.Translation(dx, dy)
end
- if (point.y > 0) then
- dy = dy + bbox:height()
+ transform_shape(shape, matrix_func)
+end
+
+-- Bounding box of a given object that is not currently contained in
+-- the page. If the object is already part of the page, simply use
+-- p:bbox(obj).
+function bbox(obj, page)
+ local objno = #page + 1
+ page:insert(objno, obj, nil, page:layers()[1])
+ local bbox = page:bbox(objno)
+ page:remove(objno)
+ return bbox
+end
+
+-- The bounding box of all selected objects.
+function bbox_of_selected_objects(page)
+ local bbox = page:bbox(page:primarySelection())
+ for obj = 1, #page, 1 do
+ if page:select(obj) then
+ bbox:add(page:bbox(obj))
+ end
end
- dx = dx + bbox:left()
- dy = dy + bbox:bottom()
- return ipe.Translation(dx, dy)
+ return bbox
end
-function mainWindow(model)
- if model.ui.win == nil then
- return model.ui
- else
- return model.ui:win()
+-- Show a warning to the user.
+function report_problem(model, text)
+ ipeui.messageBox(mainWindow(model), "warning", text, nil, nil)
+end
+
+-- Return a table of names associated with decorator symbols.
+function decorator_names(model)
+ local sheets = model.doc:sheets()
+ local symbols = sheets:allNames("symbol")
+ local res = {}
+ for _, name in pairs(symbols) do
+ if name:find("deco/") == 1 then
+ res[#res + 1] = name
+ end
end
+ return res
end
-function run_decorator(model)
- -- get bbox of primary selection
+-- Ask the user for a decorator and run the decoration.
+function run_decorator (model)
local p = model:page()
local prim = p:primarySelection()
- if not prim then
- model.ui:explain("An object must be selected.")
+ if (not prim) then
+ report_problem(model, "You must select somethings.")
return
end
- local bbox = p:bbox(prim)
+ -- local bbox_target = p:bbox(prim)
+ local bbox_target = bbox_of_selected_objects(p)
- -- create decorator object
+ local deco_obj_group = ask_for_decorator(model)
+ if (not deco_obj_group) then return end
+ if (deco_obj_group:type() ~= "group") then
+ report_problem(model, "The decoration must be a group.")
+ return
+ end
+
+ local objects = deco_obj_group:elements()
+ local last_obj = table.remove(objects, #objects)
+ local bbox_source = bbox(last_obj, p)
+ local center = ipe.Vector(bbox_source:left() + 0.5 * bbox_source:width(),
+ bbox_source:bottom() + 0.5 * bbox_source:height())
+
+ if (#objects == 0) then
+ report_problem(model, "The decoration must be a group of at least two elements.")
+ return
+ end
+ for i,deco_obj in ipairs(objects) do
+ if (deco_obj:type() ~= "path") then
+ report_problem(model, "Each decoration object needs to be a path.")
+ return
+ end
+
+ cleanup_matrix(deco_obj)
+ local deco_shape = deco_obj:shape()
+
+ resize_shape(deco_shape, center, bbox_source, bbox_target)
+
+ deco_obj:setShape(deco_shape)
+ end
+
+ local group = ipe.Group(objects)
+
+ model:creation("decoration created", group)
+end
+
+-- Asks the user for a decorator and returns the chosen decorator
+-- object or nil.
+function ask_for_decorator(model)
local dialog = ipeui.Dialog(mainWindow(model), "Select a decorator.")
local decorators = decorator_names(model)
dialog:add("deco", "combo", decorators, 1, 1, 1, 2)
if not r then return end
local deco_name = decorators[dialog:get("deco")]
local symbol = model.doc:sheets():find("symbol", deco_name)
- local deco = symbol:clone()
-
- -- run the decoration
- decorate(model, bbox, deco)
+ return symbol:clone()
end
label = "Decorator"
methods = {
- { label = "Decorate", run=run_decorator},
+ { label = "decorate", run=run_decorator},
}
projects / Misc / ipe.git / blobdiff