converted the complex example to use the proper way of transformation

examples/complex.lua

@@ -120,6 +120,7 @@ function love.load()
 
 	offsetX = 0.0
 	offsetY = 0.0
+  scale = 1.0
 	offsetOldX = 0.0
 	offsetOldY = 0.0
 	offsetChanged = false
@@ -176,14 +177,10 @@ function love.update(dt)
 		offsetX = offsetX - dt * 200
 	end
 
-	if offsetX ~= offsetOldX or offsetY ~= offsetOldY then
+	if love.keyboard.isDown("-") then
-		offsetChanged = true
+		scale = scale - 0.01
-		for i = 2, lightWorld:getLightCount() do
+	elseif love.keyboard.isDown("=") then
-      local light = lightWorld:getLight(i)
+		scale = scale + 0.01
-			light:setPosition(light:getX() + (offsetX - offsetOldX), light:getY() + (offsetY - offsetOldY))
-		end
-	else
-		offsetChanged = false
 	end
 
   for i = 1, lightWorld:getLightCount() do
@@ -195,10 +192,6 @@ function love.update(dt)
 
   for i = 1, phyCnt do
 		if phyBody[i] and (phyBody[i]:isAwake() or offsetChanged) then
-			if offsetChanged then
-				phyBody[i]:setX(phyBody[i]:getX() + (offsetX - offsetOldX))
-				phyBody[i]:setY(phyBody[i]:getY() + (offsetY - offsetOldY))
-			end
 			if phyLight[i]:getType() == "polygon" then
 				phyLight[i]:setPoints(phyBody[i]:getWorldPoints(phyShape[i]:getPoints()))
 			elseif phyLight[i]:getType() == "circle" then
@@ -213,9 +206,6 @@ function love.update(dt)
 			--if math.mod(i, 2) == 0  then
 				phyLight[i]:setNormalTileOffset(tileX, tileY)
 			--end
-			if offsetChanged then
-				phyLight[i]:setPosition(phyLight[i]:getX() + (offsetX - offsetOldX), phyLight[i]:getY() + (offsetY - offsetOldY))
-			end
 		end
   end
 
@@ -223,9 +213,6 @@ function love.update(dt)
 		physicWorld:update(dt)
 	end
 
-	offsetOldX = offsetX
-	offsetOldY = offsetY
-
 	-- draw shader
 	if colorAberration > 0.0 then
 		-- vert / horz blur
@@ -246,7 +233,11 @@ end
 
 function love.draw()
 	-- set shader buffer
-  lightWorld:draw()
+  love.graphics.push()
+    love.graphics.translate(offsetX, offsetY)
+    love.graphics.scale(scale)
+    lightWorld:draw(offsetX,offsetY, scale)
+  love.graphics.pop()
 
 	love.graphics.draw(imgLight, mx - 5, (my - 5) - (16.0 + (math.sin(lightDirection) + 1.0) * 64.0))
 
@@ -349,7 +340,7 @@ function drawBackground(l,t,w,h)
 	else
 		love.graphics.setColor(255, 255, 255)
 		if textureOn then
-			love.graphics.draw(imgFloor, quadScreen, offsetX % 32 - 32, offsetY % 24 - 24)
+			love.graphics.draw(imgFloor, quadScreen, 0,0)
 		else
 			love.graphics.rectangle("fill", 0, 0, love.graphics.getWidth(), love.graphics.getHeight())
 		end

lib/body.lua

@@ -399,7 +399,7 @@ function body:shadowStencil()
   end
 end
 
-function body:drawShadow(light, l,t,w,h,s)
+function body:drawShadow(light)
   if self.alpha < 1.0 then
     love.graphics.setBlendMode("multiplicative")
     love.graphics.setColor(self.red, self.green, self.blue)
@@ -457,18 +457,18 @@ function body:drawShadow(light, l,t,w,h,s)
     }
 
     self.shadowMesh:setVertices(self.shadowVert)
-    love.graphics.draw(self.shadowMesh, self.x - self.ox + l, self.y - self.oy + t, 0, s, s)
+    love.graphics.draw(self.shadowMesh, self.x - self.ox, self.y - self.oy, 0, s, s)
   end
 end
 
-function body:drawPixelShadow(l,t,w,h)
+function body:drawPixelShadow()
   if self.type == "image" and self.normalMesh then
     love.graphics.setColor(255, 255, 255)
     love.graphics.draw(self.normalMesh, self.x - self.nx, self.y - self.ny)
   end
 end
 
-function body:drawGlow(l,t,w,h)
+function body:drawGlow()
   if self.glowStrength > 0.0 then
     love.graphics.setColor(self.glowRed * self.glowStrength, self.glowGreen * self.glowStrength, self.glowBlue * self.glowStrength)
   else
@@ -497,14 +497,14 @@ function body:drawGlow(l,t,w,h)
   love.graphics.setShader()
 end
 
-function body:drawRefraction(l,t,w,h)
+function body:drawRefraction()
   if self.refraction and self.normal then
     love.graphics.setColor(255, 255, 255)
     if self.tileX == 0.0 and self.tileY == 0.0 then
-      love.graphics.draw(normal, self.x - self.nx + l, self.y - self.ny + t)
+      love.graphics.draw(normal, self.x - self.nx, self.y - self.ny)
     else
       self.normalMesh:setVertices(self.normalVert)
-      love.graphics.draw(self.normalMesh, self.x - self.nx + l, self.y - self.ny + t)
+      love.graphics.draw(self.normalMesh, self.x - self.nx, self.y - self.ny)
     end
   end
 
@@ -518,32 +518,32 @@ function body:drawRefraction(l,t,w,h)
     elseif self.type == "polygon" then
       love.graphics.polygon("fill", unpack(self.data))
     elseif self.type == "image" and self.img then
-      love.graphics.draw(self.img, self.x - self.ix + l, self.y - self.iy + t)
+      love.graphics.draw(self.img, self.x - self.ix, self.y - self.iy)
     end
   end
 end
 
-function body:drawReflection(l,t,w,h)
+function body:drawReflection()
   if self.reflection and self.normal then
     love.graphics.setColor(255, 0, 0)
     self.normalMesh:setVertices(self.normalVert)
-    love.graphics.draw(self.normalMesh, self.x - self.nx + l, self.y - self.ny + t)
+    love.graphics.draw(self.normalMesh, self.x - self.nx, self.y - self.ny)
   end
   if self.reflective and self.img then
     love.graphics.setColor(0, 255, 0)
-    love.graphics.draw(self.img, self.x - self.ix + l, self.y - self.iy + t)
+    love.graphics.draw(self.img, self.x - self.ix, self.y - self.iy)
   elseif not self.reflection and self.img then
     love.graphics.setColor(0, 0, 0)
-    love.graphics.draw(self.img, self.x - self.ix + l, self.y - self.iy + t)
+    love.graphics.draw(self.img, self.x - self.ix, self.y - self.iy)
   end
 end
 
-function body:drawMaterial(l,t,w,h)
+function body:drawMaterial()
   if self.material and self.normal then
     love.graphics.setShader(self.materialShader)
     love.graphics.setColor(255, 255, 255)
     self.materialShader:send("material", self.material)
-    love.graphics.draw(self.normal, self.x - self.nx + l, self.y - self.ny + t)
+    love.graphics.draw(self.normal, self.x - self.nx, self.y - self.ny)
     love.graphics.setShader()
   end
 end

lib/light.lua

@@ -142,17 +142,16 @@ function light:drawShadow(l,t,w,h,s,bodies, canvas)
       end
     end
 
+    -- draw shadow
     self.shadow:clear()
-    self.shader:send("lightPosition", {self.x - l, h - (self.y - t), self.z})
+    util.drawto(self.shadow, l, t, s, function()
+      self.shader:send("lightPosition", {self.x + l, h - (self.y + t), self.z})
       self.shader:send("lightRange", self.range)
       self.shader:send("lightColor", {self.red / 255.0, self.green / 255.0, self.blue / 255.0})
       self.shader:send("lightSmooth", self.smooth)
       self.shader:send("lightGlow", {1.0 - self.glowSize, self.glowStrength})
       self.shader:send("lightAngle", math.pi - self.angle / 2.0)
       self.shader:send("lightDirection", self.direction)
-
-    -- draw shadow
-    util.drawto(self.shadow, l, t, s, function()
       love.graphics.setShader(self.shader)
       love.graphics.setInvertedStencil(stencils.shadow(shadow_geometry, bodies))
       love.graphics.setBlendMode("additive")
@@ -178,9 +177,9 @@ function light:drawShadow(l,t,w,h,s,bodies, canvas)
     end)
 
     -- update shine
+    self.shine:clear(255, 255, 255)
     util.drawto(self.shine, l, t, s, function()
       love.graphics.setShader(self.shader)
-      self.shine:clear(255, 255, 255)
       love.graphics.setBlendMode("alpha")
       love.graphics.setStencil(stencils.colorShadow(bodies))
       love.graphics.rectangle("fill", -l,-t,w,h)

lib/light_world.lua

@@ -131,7 +131,7 @@ function light_world:drawShadow(l,t,w,h,s)
   util.drawto(self.shadow, l, t, s, function()
     love.graphics.setColor(unpack(self.ambient))
     love.graphics.setBlendMode("alpha")
-    love.graphics.rectangle("fill", l, t, w, h)
+    love.graphics.rectangle("fill", -l, -t, w, h)
     for i = 1, #self.lights do
       self.lights[i]:drawShadow(l,t,w,h,s,self.body, self.shadow)
     end
@@ -151,7 +151,7 @@ function light_world:drawShine(l,t,w,h,s)
   util.drawto(self.shine, l, t, s, function()
     love.graphics.setColor(unpack(self.ambient))
     love.graphics.setBlendMode("alpha")
-    love.graphics.rectangle("fill", l, t, w, h)
+    love.graphics.rectangle("fill", -l, -t, w, h)
     love.graphics.setColor(255, 255, 255)
     love.graphics.setBlendMode("additive")
     for i = 1, #self.lights do