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- Committer: Josh C
- Date: 2013-03-02 20:40:57 UTC
- Revision ID: josh@9ix.org-20130302204057-yrra0a51zgtpq2v2
zoetrope 1.3.1
- files added:
- zoetrope
- zoetrope/core
- zoetrope/sprites
- zoetrope/ui
- zoetrope/utils
added
removed
zoetrope/core/view.lua
1
-- Class: View
2
-- A view is a group that packages several useful objects with it.
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-- It's helpful to use, but not required. When a view is created, it
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-- automatically sets the.view for itself. the.view should be considered
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-- a read-only reference. If you want to switch views, you *must* set
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-- the app's view property instead.
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--
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-- Extends:
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-- <Group>
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View = Group:extend{
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-- Property: timer
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-- A built-in <Timer> object for use as needed.
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-- Property: tween
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-- A built-in <Tween> object for use as needed.
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-- Property: factory
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-- A built-in <Factory> object for use as needed.
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-- Property: focus
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-- A <Sprite> to keep centered onscreen.
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-- Property: focusOffset
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-- This shifts the view of the focus, if one is set. If both
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-- x and y properties are set to 0, then the view keeps the focus
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-- centered onscreen.
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focusOffset = { x = 0, y = 0 },
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-- Property: minVisible
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-- The view clamps its scrolling so that nothing above or to the left
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-- of these x and y coordinates is visible.
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minVisible = { x = -math.huge, y = -math.huge },
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-- Property: maxVisible
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-- This view clamps its scrolling so that nothing below or to the right
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-- of these x and y coordinates is visible.
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maxVisible = { x = math.huge, y = math.huge },
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-- private property: _tint
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-- used to implement tints.
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-- private property: _fx
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-- used to perform fades and flashes.
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new = function (self, obj)
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obj = self:extend(obj)
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obj.timer = Timer:new()
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obj:add(obj.timer)
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obj.tween = Tween:new()
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obj:add(obj.tween)
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obj.factory = Factory:new()
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-- set the.view briefly, so that during the onNew() handler
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-- we appear to be the current view
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local oldView = the.view
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the.view = obj
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if obj.onNew then obj:onNew() end
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-- then reset it so that nothing breaks for the remainder
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-- of the frame for the old, outgoing view members.
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-- our parent app will restore us into the.view at the top of the next frame
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-- exception: there was no old view.
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if oldView then the.view = oldView end
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return obj
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end,
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-- Method: loadLayers
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-- Loads layers from a Lua source file (as generated by Tiled -- http://mapeditor.org).
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-- Each layer is created as a <Group> and added to preserve its ordering. Tile layers
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-- are created as <Map> instances; object layers will try to create instances of a class
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-- named by the object's name property. If no class exists by this name, or the object
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-- has no name property, a gray fill will be created instead, as a placeholder. If the
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-- object has a property named _the, then this will set the.[whatever] to it.
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--
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-- Arguments:
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-- file - filename to load
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--
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-- Returns:
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-- nothing
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loadLayers = function (self, file)
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local ok, data = pcall(loadstring(Cached:text(file)))
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local _, _, directory = string.find(file, '^(.*[/\\])')
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directory = directory or ''
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if ok then
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-- store tile properties by gid
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local tileProtos = {}
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for _, tileset in pairs(data.tilesets) do
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for _, tile in pairs(tileset.tiles) do
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local id = tileset.firstgid + tile.id
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for key, value in pairs(tile.properties) do
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tile.properties[key] = tovalue(value)
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end
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tileProtos[id] = tile
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tileProtos[id].width = tileset.tilewidth
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tileProtos[id].height = tileset.tileheight
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end
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end
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for _, layer in pairs(data.layers) do
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if View[layer.name] then
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error('the View class reserves the ' .. layer.name .. ' property for its own use; you cannot load a layer with that name')
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end
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if STRICT and self[layer.name] then
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local info = debug.getinfo(2, 'Sl')
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print('Warning: a property named ' .. layer.name .. ' already exists in the current view (' ..
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info.short_src .. ', line ' .. info.currentline .. ')')
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end
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if layer.type == 'tilelayer' then
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local map = Map:new{ spriteWidth = data.tilewidth, spriteHeight = data.tileheight }
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map:empty(layer.width, layer.height)
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-- load tiles
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for _, tiles in pairs(data.tilesets) do
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map:loadTiles(directory .. tiles.image, Tile, tiles.firstgid)
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-- and mix in properties where applicable
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for id, tile in pairs(tileProtos) do
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if map.sprites[id] then
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map.sprites[id]:mixin(tile.properties)
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end
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end
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end
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-- load tile data
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local x = 1
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local y = 1
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for _, val in ipairs(layer.data) do
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map.map[x][y] = val
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x = x + 1
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if x > layer.width then
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x = 1
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y = y + 1
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end
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end
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self[layer.name] = map
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self:add(map)
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elseif layer.type == 'objectgroup' then
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local group = Group:new()
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for _, obj in pairs(layer.objects) do
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-- roll in tile properties if based on a tile
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if obj.gid and tileProtos[obj.gid] then
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local tile = tileProtos[obj.gid]
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obj.name = tile.properties.name
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obj.width = tile.width
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obj.height = tile.height
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for key, value in pairs(tile.properties) do
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obj.properties[key] = tovalue(value)
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end
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-- Tiled tile-based objects measure their y
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-- position at their lower-left corner, instead
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-- of their upper-left corner as usual
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obj.y = obj.y - obj.height
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end
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-- create a new object if the class does exist
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local spr
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if _G[obj.name] then
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obj.properties.x = obj.x
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obj.properties.y = obj.y
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obj.properties.width = obj.width
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obj.properties.height = obj.height
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spr = _G[obj.name]:new(obj.properties)
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else
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spr = Fill:new{ x = obj.x, y = obj.y, width = obj.width, height = obj.height, fill = { 128, 128, 128 } }
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end
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if obj.properties._the then
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the[obj.properties._the] = spr
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end
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group:add(spr)
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end
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self[layer.name] = group
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self:add(group)
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else
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error("don't know how to create a " .. layer.type .. " layer from file data")
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end
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end
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else
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error('could not load view data from file: ' .. data)
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end
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end,
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-- Method: clampTo
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-- Clamps the view so that it never scrolls past a sprite's boundaries.
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-- This only looks at the sprite's position at this instant in time,
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-- not afterwards.
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--
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-- Arguments:
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-- sprite - sprite to clamp to
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--
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-- Returns:
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-- nothing
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clampTo = function (self, sprite)
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self.minVisible.x = sprite.x
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if sprite.x + sprite.width > the.app.width then
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self.maxVisible.x = sprite.x + sprite.width
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else
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self.maxVisible.x = the.app.width
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end
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self.minVisible.y = sprite.y
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if sprite.y + sprite.height > the.app.height then
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self.maxVisible.y = sprite.y + sprite.height
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else
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self.maxVisible.y = the.app.height
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end
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end,
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-- Method: panTo
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-- Pans the view so that the target sprite or position is centered
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-- onscreen. This sets the view's focus to nil.
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--
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-- Arguments:
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-- target - sprite or coordinate pair to pan to
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-- duration - how long the pan will take, in seconds
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-- ease - what easing to apply, see <Tween> for details, defaults to 'quadInOut'
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--
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-- Returns:
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-- A <Promise> that is fulfilled when the pan completes.
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panTo = function (self, target, duration, ease)
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ease = ease or 'quadInOut'
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local targetX, targetY
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if STRICT then
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assert((target.x and target.y and target.width and target.height) or (#target == 2),
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'pan target does not appear to be a sprite or coordinate pair')
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assert(type(duration) == 'number', 'pan duration is not a number')
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assert(self.tween.easers[ease], 'pan easing method ' .. ease .. ' is not defined')
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end
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if target.x and target.y and target.width and target.height then
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targetX = target.x + target.width / 2
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targetY = target.y + target.height / 2
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else
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targetX = target[1]
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targetY = target[2]
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end
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-- calculate translation to center these coordinates
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local tranX = math.floor(-targetX + the.app.width / 2)
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local tranY = math.floor(-targetY + the.app.height / 2)
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-- clamp translation to min and max visible
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if tranX > - self.minVisible.x then tranX = - self.minVisible.x end
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if tranY > - self.minVisible.y then tranY = - self.minVisible.y end
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if tranX < the.app.width - self.maxVisible.x then
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tranX = the.app.width - self.maxVisible.x
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end
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if tranY < the.app.height - self.maxVisible.y then
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tranY = the.app.height - self.maxVisible.y
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end
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-- tween the appropriate properties
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-- some care has to be taken to avoid fulfilling the promise twice
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self.focus = nil
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local promise = Promise:new()
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if tranX ~= self.translate.x then
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self.tween:start(self.translate, 'x', tranX, duration, ease)
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:andThen(function() promise:fulfill() end)
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if tranY ~= self.translate.y then
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self.tween:start(self.translate, 'y', tranY, duration, ease)
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end
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elseif tranY ~= self.translate.y then
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self.tween:start(self.translate, 'y', tranY, duration, ease)
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:andThen(function() promise:fulfill() end)
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else
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promise:fulfill()
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end
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return promise
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end,
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-- Method: fade
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-- Fades out to a specified color over a period of time.
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--
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-- Arguments:
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-- color - color table to fade to, e.g. { 0, 0, 0 }
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-- duration - how long to fade out in seconds, default 1
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--
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-- Returns:
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-- A <Promise> that is fulfilled when the effect completes.
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fade = function (self, color, duration)
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assert(type(color) == 'table', 'color to fade to is ' .. type(color) .. ', not a table')
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local alpha = color[4] or 255
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self._fx = color
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self._fx[4] = 0
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return self.tween:start(self._fx, 4, alpha, duration or 1, 'quadOut')
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end,
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-- Method: flash
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-- Immediately flashes the screen to a specific color, then fades out.
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--
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-- Arguments:
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-- color - color table to flash, e.g. { 0, 0, 0 }
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-- duration - how long to restore normal view in seconds, default 1
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--
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-- Returns:
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-- A <Promise> that is fulfilled when the effect completes.
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flash = function (self, color, duration)
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assert(type(color) == 'table', 'color to flash is ' .. type(color) .. ', not a table')
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color[4] = color[4] or 255
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self._fx = color
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return self.tween:start(self._fx, 4, 0, duration or 1, 'quadOut')
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end,
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-- Method: tint
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-- Immediately tints the screen a color. To restore normal viewing,
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-- call this method again with no arguments.
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--
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-- Arguments:
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-- red - red component, 0-255
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-- green - green component, 0-255
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-- blue - blue component, 0-255
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-- alpha - alpha, 0-255, default 255
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--
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-- Returns:
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-- nothing
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tint = function (self, red, green, blue, alpha)
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alpha = alpha or 255
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if red and green and blue and alpha > 0 then
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self._tint = { red, green, blue, alpha }
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else
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self._tint = nil
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end
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end,
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update = function (self, elapsed)
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local screenWidth = the.app.width
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local screenHeight = the.app.height
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-- follow the focused sprite
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if self.focus and self.focus.width < screenWidth
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and self.focus.height < screenHeight then
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self.translate.x = math.floor(- (self.focus.x + self.focusOffset.x) +
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(screenWidth - self.focus.width) / 2)
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self.translate.y = math.floor(- (self.focus.y + self.focusOffset.y) +
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(screenHeight - self.focus.height) / 2)
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end
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-- clamp translation to min and max visible
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if self.translate.x > - self.minVisible.x then
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self.translate.x = - self.minVisible.x
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end
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if self.translate.y > - self.minVisible.y then
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self.translate.y = - self.minVisible.y
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end
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if self.translate.x < screenWidth - self.maxVisible.x then
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self.translate.x = screenWidth - self.maxVisible.x
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end
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if self.translate.y < screenHeight - self.maxVisible.y then
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self.translate.y = screenHeight - self.maxVisible.y
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end
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Group.update(self, elapsed)
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end,
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draw = function (self, x, y)
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Group.draw(self, x, y)
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-- draw our fx and tint on top of everything
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if self._tint then
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love.graphics.setColor(self._tint)
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love.graphics.rectangle('fill', 0, 0, the.app.width, the.app.height)
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love.graphics.setColor(255, 255, 255, 255)
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end
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if self._fx then
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love.graphics.setColor(self._fx)
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love.graphics.rectangle('fill', 0, 0, the.app.width, the.app.height)
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love.graphics.setColor(255, 255, 255, 255)
422
end
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end,
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__tostring = function (self)
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local result = 'View ('
427
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if self.active then
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result = result .. 'active'
430
else
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result = result .. 'inactive'
432
end
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if self.visible then
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result = result .. ', visible'
436
else
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result = result .. ', invisible'
438
end
439
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if self.solid then
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result = result .. ', solid'
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else
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result = result .. ', not solid'
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end
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return result .. ', ' .. self:count(true) .. ' sprites)'
447
end
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}
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