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--!A cross-platform build utility based on Lua
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
-- Copyright (C) 2015-present, Xmake Open Source Community.
--
-- @author ruki
-- @file rect.lua
--
-- load modules
local point = require("ui/point")
local object = require("ui/object")
-- define module
local rect = rect or object { _init = {"sx", "sy", "ex", "ey"} }
-- make rect
function rect:new(x, y, w, h)
return rect { x, y, x + w, y + h }
end
-- get rect size
function rect:size()
return point { self.ex - self.sx, self.ey - self.sy }
end
-- get width
function rect:width()
return self.ex - self.sx
end
-- get height
function rect:height()
return self.ey - self.sy
end
-- resize rect
function rect:resize(w, h)
self.ex = self.sx + w
self.ey = self.sy + h
end
-- move rect
function rect:move(dx, dy)
self.sx = self.sx + dx
self.sy = self.sy + dy
self.ex = self.ex + dx
self.ey = self.ey + dy
return self
end
-- move rect to the given position
function rect:move2(x, y)
local w = self.ex - self.sx
local h = self.ey - self.sy
self.sx = x
self.sy = y
self.ex = x + w
self.ey = y + h
return self
end
-- move top right corner of the rect
function rect:moves(dx, dy)
self.sx = self.sx + dx
self.sy = self.sy + dy
return self
end
-- move bottom left corner of the rect
function rect:movee(dx, dy)
self.ex = self.ex + dx
self.ey = self.ey + dy
return self
end
-- expand rect area
function rect:grow(dx, dy)
self.sx = self.sx - dx
self.sy = self.sy - dy
self.ex = self.ex + dx
self.ey = self.ey + dy
return self
end
-- is intersect?
function rect:is_intersect(r)
return not self():intersect(r):empty()
end
-- set rect with shared area between this rect and a given rect
function rect:intersect(r)
self.sx = math.max(self.sx, r.sx)
self.sy = math.max(self.sy, r.sy)
self.ex = math.min(self.ex, r.ex)
self.ey = math.min(self.ey, r.ey)
return self
end
-- get rect with shared area between two rects: local rect_new = r1 / r2
function rect:__div(r)
return self():intersect(r)
end
-- set union rect
function rect:union(r)
self.sx = math.min(self.sx, r.sx)
self.sy = math.min(self.sy, r.sy)
self.ex = math.max(self.ex, r.ex)
self.ey = math.max(self.ey, r.ey)
return self
end
-- get union rect: local rect_new = r1 + r2
function rect:__add(r)
return self():union(r)
end
-- r1 == r1?
function rect:__eq(r)
return
self.sx == r.sx and
self.sy == r.sy and
self.ex == r.ex and
self.ey == r.ey
end
-- contains the given point in rect?
function rect:contains(x, y)
return x >= self.sx and x < self.ex and y >= self.sy and y < self.ey
end
-- empty rect?
function rect:empty()
return self.sx >= self.ex or self.sy >= self.ey
end
-- tostring(r)
function rect:__tostring()
if self:empty() then
return '[]'
end
return string.format("[%d, %d, %d, %d]", self.sx, self.sy, self.ex, self.ey)
end
-- r1 .. r2
function rect.__concat(op1, op2)
if type(op1) == 'string' then
return op1 .. op2:__tostring()
elseif type(op2) == 'string' then
return op1:__tostring() .. op2
else
return op1:__tostring() .. op2:__tostring()
end
end
-- return module
return rect
|
