library-mirrors/light_world.lua
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scaling and rotation now works

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Tim Anema 2015-02-18 10:23:17 -05:00
parent 115d64f51f
commit 9b5765e0ed
2 changed files with 33 additions and 46 deletions
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59
lib/body.lua
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@ -117,30 +117,22 @@ end
-- refresh
function body:refresh()
if self.shadowType == 'polygon' and self:has_changed() then
local dx, dy, dr, dsx, dsy = self:changes()
if self:position_changed() then
for i = 1, #self.data, 2 do
self.data[i], self.data[i+1] = self.data[i] + dx, self.data[i+1] + dy
end
end
if self:rotation_changed() then
local center = vector(self.x, self.y)
for i = 1, #self.data, 2 do
self.data[i], self.data[i+1] = vector(self.data[i], self.data[i+1]):rotateAround(center, dr):unpack()
end
end
if self:scale_changed() then
for i = 1, #self.data, 2 do
self.data[i] = self.x + (self.data[i] - self.x) + ((self.data[i] - self.x) * dsx)
self.data[i+1] = self.y + (self.data[i+1] - self.y) + ((self.data[i+1] - self.y) * dsy)
end
self.data = {unpack(self.unit_data)}
local center = vector(self.x, self.y)
for i = 1, #self.data, 2 do
local point = vector(self.data[i], self.data[i+1])
point = point:rotate(self.rotation)
point = point:scale(self.scalex, self.scaley)
self.data[i], self.data[i+1] = (point + center):unpack()
end
self:commit_changes()
end
end
function body:has_changed()
return self:position_changed() or self:rotation_changed() or self:scale_changed()
return self:position_changed() or
self:rotation_changed() or
self:scale_changed()
end
function body:position_changed()
@ -157,14 +149,6 @@ function body:scale_changed()
self.old_scaley ~= self.scaley
end
function body:changes()
return self.x - self.old_x,
self.y - self.old_y,
self.rotation - self.old_rotation,
self.scalex - self.old_scalex,
self.scaley - self.old_scaley
end
function body:commit_changes()
self.old_x, self.old_y = self.x, self.y
self.old_rotation = self.rotation
@ -331,28 +315,37 @@ end
-- set polygon data
function body:setPoints(...)
local points = {...}
self.x, self.y, self.width, self.height = points[1], points[2], 0, 0
for i = 1, #points, 2 do
local px, py = points[i], points[i+1]
self.unit_data = {...}
--calculate l,r,t,b
self.x, self.y, self.width, self.height = self.unit_data[1], self.unit_data[2], 0, 0
for i = 1, #self.unit_data, 2 do
local px, py = self.unit_data[i], self.unit_data[i+1]
if px < self.x then self.x = px end
if py < self.y then self.y = py end
if px > self.width then self.width = px end
if py > self.height then self.height = py end
end
-- normalize width and height
self.width = self.width - self.x
self.height = self.height - self.y
for i = 1, #points, 2 do
points[i], points[i+1] = points[i] - self.x, points[i+1] - self.y
for i = 1, #self.unit_data, 2 do
self.unit_data[i], self.unit_data[i+1] = self.unit_data[i] - self.x, self.unit_data[i+1] - self.y
end
self.x = self.x + (self.width * 0.5)
self.y = self.y + (self.height * 0.5)
local poly_canvas = love.graphics.newCanvas(self.width, self.height)
util.drawto(poly_canvas, 0, 0, 1, function()
love.graphics.polygon('fill', points)
love.graphics.polygon('fill', self.unit_data)
end)
--normalize points to be around the center x y
for i = 1, #self.unit_data, 2 do
self.unit_data[i], self.unit_data[i+1] = self.unit_data[i] - self.width * 0.5, self.unit_data[i+1] - self.height * 0.5
end
self.img = love.graphics.newImage(poly_canvas:getImageData())
self.imgWidth = self.img:getWidth()
self.imgHeight = self.img:getHeight()

20
lib/vector.lua
View File

@ -47,19 +47,13 @@ function vector:unpack()
return self.x, self.y
end
function vector:rotateAround(origin, angle)
local s = math.sin(angle)
local c = math.cos(angle)
-- translate point back to origin
self.x = self.x - origin.x
self.y = self.y - origin.y
-- rotate point
self.x = (self.x * c - self.y * s)
self.y = (self.x * s + self.y * c)
-- translate point back
self.x = self.x + origin.x
self.y = self.y + origin.y
return self
function vector:rotate(theta)
return new((math.cos(theta) * self.x) - (math.sin(theta) * self.y),
(math.sin(theta) * self.x) + (math.cos(theta) * self.y))
end
function vector:scale(sx, sy)
return new(self.x * sx, self.y * sy)
end
return setmetatable({new = new}, {__call = function(_, ...) return new(...) end})