Object.lua

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-- -= Object =-
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-- Setup
local Object = {class = "Object"}
Object.__index = Object

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-- Returns a new Object
function Object:new(layer, name, type, x, y, width, height, gid, prop)

    -- Public:
    local obj = setmetatable({}, Object)
    obj.layer = layer           -- The layer that the object belongs to
    obj.name = name or ""       -- Name of the object
    obj.type = type or ""       -- Type of the object
    obj.x = x or 0              -- X location on the map
    obj.y = y  or 0             -- Y location on the map
    obj.width = width or 0      -- Object width in tiles
    obj.height = height or 0    -- Object height in tiles
    obj.gid = gid               -- The object's associated tile. If false an outline will be drawn.
    obj.visible = true          -- If false then the object will not be drawn
    obj.properties = prop or {} -- Properties set by tiled.
    obj.polygon = nil           -- Polygon points. Set by the Loader if defined in Tiled.
    obj.polyline = nil          -- Polyline points. Set by the Loader if defined in Tiled.
    
    -- drawInfo stores values needed to actually draw the object. You can either set these yourself
    -- or use updateDrawInfo to do it automatically.
    obj.drawInfo = {
    
        -- x and y are the drawing location of the object. This is different than the object's x and
        -- y value which is the object's placement on the map.
        x = 0,      -- The x draw location
        y = 0,      -- The y draw location
        
        -- These limit the drawing of the object. If the object falls out of the bounds of
        -- the map's drawRange then the object will not be drawn. 
        left = 0,   -- The leftmost point on the object
        right = 0,  -- The rightmost point on the object
        top = 0,    -- The highest point on the object
        bottom = 0, -- The lowest point on the object
        
        -- The order to draw the object in relation to other objects. Usually equal to bottom.
        order = 0,
        
        -- In addition to this, other drawing information can be stored in the numerical 
        -- indicies which is context sensitive to the map's orientation, if the object has a gid, or
        -- of the object is a polygon or polyline object.
    } 
    
    -- Update the draw info
    Object.updateDrawInfo(obj)
    
    -- Return our object
    return obj
end

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-- Updates the draw information. Call this every time the object moves or changes size.
function Object:updateDrawInfo()
    local di = self.drawInfo
    local map = self.layer.map
        
    if self.polygon or self.polyline then
        -- Reset the draw info
        self.drawInfo = {}
        di = self.drawInfo
        -- Set the box to the first vertex
        local vertexes = self.polygon or self.polyline
        -- Create the draw information for each vertex
        for k,v in ipairs(vertexes) do
            if k%2 == 1 then
                if map.orientation == "isometric" then 
                    di[k], di[k+1] = map:fromIso(self.x+vertexes[k], self.y+vertexes[k+1])
                else
                    di[k], di[k+1] = self.x+vertexes[k], self.y+vertexes[k+1]
                end
                di[k], di[k+1] = di[k] - map.offsetX, di[k+1] - map.offsetY
            end
        end
        -- Set the start draw location
        di.x, di.y = di[1], di[2]
        -- Prime the bounds
        di.left, di.right, di.top, di.bottom = di.x, di.x, di.y, di.y
        -- Go through each vertex and find the highest and lowest values for the bounds.
        for k,v in ipairs(di) do
            -- if it's odd then it's an x value
            if k%2 == 1 then
                if v < di.left then di.left = v end
                if v > di.right then di.right = v end
            -- if it's even it's a y value
            else
                if v < di.top then di.top = v end
                if v > di.bottom then di.bottom = v end
            end
        end
        di.order = di.bottom
    
    -- Isometric map
    elseif map.orientation == "isometric" then
        -- Is a tile object
        if self.gid then
            local t = map.tiles[self.gid]
            local tw, th = t.width, t.height
            di.x, di.y  = map:fromIso(self.x, self.y)
            di.x, di.y = di.x - map.offsetX, di.y - map.offsetY
            di.order = di.y
            di.x = di.x - map.tileWidth/2
            di.left, di.right, di.top, di.bottom = di.x, di.x+tw, di.y , di.y +th
        -- Is not a tile object
        else
            di[1], di[2] = map:fromIso(self.x, self.y)
            di[3], di[4] = map:fromIso(self.x + self.width, self.y)
            di[5], di[6] = map:fromIso(self.x + self.width, self.y + self.height)
            di[7], di[8] = map:fromIso(self.x, self.y + self.height)
            for i =1,7,2 do
                di[i] = di[i] - map.offsetX
                di[i+1] = di[i+1] - map.offsetY
            end
            di.left, di.right, di.top, di.bottom = di[7], di[3], di[2], di[6]
            di.order = 1
        end
        
    -- Orthogonal map
    else
        -- Is a tile object
        if self.gid then
            local t = map.tiles[self.gid]
            local tw, th = t.width, t.height
            di.x, di.y = self.x - map.offsetX, self.y - map.offsetY
            di.order = di.y
            di.left, di.top, di.right, di.bottom = di.x, di.y, di.x+tw, di.y+th
        -- Is not a tile object
        else
            di.x, di.y = self.x - map.offsetX, self.y - map.offsetY
            di[1], di[2] = di.x, di.y
            di[3], di[4] = self.width > 20 and self.width or 20, self.height > 20 and self.height or 20
            di.left, di.top, di.right, di.bottom = di.x, di.y , di.x+di[3], di.y +di[4]
            di.order = 1
        end
    end
end

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-- Draw the object. The passed color is the color of the object layer the object belongs to.
function Object:draw(x, y, r, g, b, a)

    if not self.visible then return end
    
    local di = self.drawInfo
    love.graphics.setLineWidth(2)

    -- The object is a polyline.
    if self.polyline then
        love.graphics.push()
        love.graphics.translate(0,1)
        love.graphics.setColor(0, 0, 0, a)
        love.graphics.line( unpack(di) )
        love.graphics.pop()
        love.graphics.setColor(r, g, b, a)
        love.graphics.line( unpack(di) )
        
    -- The object is a polygon.
    elseif self.polygon then
        love.graphics.push()
        love.graphics.translate(0,1)
        love.graphics.setColor(0, 0, 0, a)
        love.graphics.polygon( "line", unpack(di) )
        love.graphics.pop()
        love.graphics.setColor(r,g,b,a)
        love.graphics.polygon( "line", unpack(di) ) 
        
    -- The object is a tile object. Draw the tile.
    elseif self.gid then
        local tile = self.layer.map.tiles[self.gid]
        tile:draw(di.x, di.y - tile.height)
        
    -- Map is isometric. Draw a parallelogram.
    elseif self.layer.map.orientation == "isometric" then
        love.graphics.setColor(r, g, b, a/5)
        love.graphics.polygon("fill", unpack(di))
        
        love.graphics.push()
        love.graphics.translate(0,1)
        love.graphics.setColor(0, 0, 0, a)
        love.graphics.polygon("line", unpack(di))
        love.graphics.pop()
            
        love.graphics.setColor(r,g,b,a)
        love.graphics.polygon("line", unpack(di))

    -- Map is orthogonal. Draw a rectangle.
    else
        love.graphics.setColor(r, g, b, a/5)
        love.graphics.rectangle("fill", unpack(di))
            
        love.graphics.setColor(0, 0, 0, a)
        love.graphics.push()
        love.graphics.translate(1,1)
        love.graphics.rectangle("line", unpack(di))
        love.graphics.print(self.name, di.x, di.y-20)
        love.graphics.pop()
            
        love.graphics.setColor(r,g,b,a)
        love.graphics.rectangle("line", unpack(di))
        love.graphics.print(self.name, di.x, di.y-20)
    end
end

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-- Returns the Object class
return Object


--[[Copyright (c) 2011-2012 Casey Baxter

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

Except as contained in this notice, the name(s) of the above copyright holders
shall not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.--]]