working on rotation and scaling of light bodies

examples/short.lua

@@ -86,12 +86,6 @@ function love.keypressed(k)
 		if colorAberration == 0.0 then
 			colorAberration = 3.0
 		end
-	elseif k == "f" then
-    lightWorld:remove(lightMouse)
-	elseif k == "g" then
-    lightWorld:remove(circleTest)
-	elseif k == "d" then
-    lightWorld:remove(rectangleTest)
   end
 end
 
@@ -122,6 +116,17 @@ function love.update(dt)
     polygonTest:move((dt * 200), 0)
   end
 
+	if love.keyboard.isDown("f") then
+    polygonTest:scale(0.005)
+	elseif love.keyboard.isDown("a") then
+    polygonTest:scale(-0.005)
+  end
+	if love.keyboard.isDown("s") then
+    polygonTest:rotate(0.05)
+	elseif love.keyboard.isDown("d") then
+    polygonTest:rotate(-0.05) 
+  end
+
 	if love.keyboard.isDown("-") then
 		scale = scale - 0.01
 	elseif love.keyboard.isDown("=") then

lib/body.lua

@@ -28,6 +28,10 @@ local function new(id, type, ...)
 	obj.tileY = 0
   obj.zheight = 1
 
+  obj.rotation = 0
+  obj.scalex = 1
+  obj.scaley = 1
+ 
   obj.castsNoShadow = false
   obj.visible = true
   obj.is_on_screen = true
@@ -49,21 +53,19 @@ local function new(id, type, ...)
 
     obj:setShadowType('circle', args[3], args[4], args[5])
 	elseif obj.type == "rectangle" then
-		obj.x = args[1] or 0
+		local x = args[1] or 0
-		obj.y = args[2] or 0
+		local y = args[2] or 0
+    local width = args[3] or 64
+    local height = args[4] or 64
+    local ox = args[5] or width * 0.5
+    local oy = args[6] or height * 0.5
 
-    local rectangle_canvas = love.graphics.newCanvas(args[3], args[4])
+    obj:setPoints(
-    util.drawto(rectangle_canvas, 0, 0, 1, function()
+      x - ox, y - oy,
-      love.graphics.rectangle('fill', 0, 0, args[3], args[4]) 
+      x - ox + width, y - oy,
-    end)
+      x - ox + width, y - oy + height,
-    obj.img = love.graphics.newImage(rectangle_canvas:getImageData()) 
+      x - ox,  y - oy + height
-    obj.imgWidth = obj.img:getWidth()
+    )
-    obj.imgHeight = obj.img:getHeight()
-    obj.ix = obj.imgWidth * 0.5
-    obj.iy = obj.imgHeight * 0.5
-    obj:generateNormalMapFlat("top")
-
-    obj:setShadowType('rectangle', args[3], args[4])
 	elseif obj.type == "polygon" then
     obj:setPoints(...)
 	elseif obj.type == "image" then
@@ -106,29 +108,69 @@ local function new(id, type, ...)
     obj.oy = obj.height * 0.5
     obj.reflection = true
 	end
-  obj.old_x, obj.old_y = obj.x, obj.y
+
+  obj:commit_changes()
 
   return obj
 end
 
 -- refresh
 function body:refresh()
-  if self.shadowType == "rectangle" then
+  if self.shadowType == 'polygon' and self:has_changed() then
-    self.data = {
+    local dx, dy, dr, dsx, dsy = self:changes()
-      self.x - self.ox, self.y - self.oy,
+    if self:position_changed() then
-      self.x - self.ox + self.width, self.y - self.oy,
+      for i = 1, #self.data, 2 do
-      self.x - self.ox + self.width, self.y - self.oy + self.height,
+        self.data[i], self.data[i+1] = self.data[i] + dx, self.data[i+1] + dy
-      self.x - self.ox, self.y - self.oy + self.height
+      end
-    }
-  elseif self.shadowType == 'polygon' and (self.old_x ~= self.x or self.old_y ~= self.y) then
-    local dx, dy = self.x - self.old_x, self.y - self.old_y
-    for i = 1, #self.data, 2 do
-      self.data[i], self.data[i+1] = self.data[i] + dx, self.data[i+1] + dy
     end
-    self.old_x, self.old_y = self.x, self.y
+    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
+    end
+    self:commit_changes()
   end
 end
 
+function body:has_changed()
+  return self:position_changed() or self:rotation_changed() or self:scale_changed()
+end
+
+function body:position_changed()
+  return self.old_x ~= self.x or 
+         self.old_y ~= self.y
+end
+
+function body:rotation_changed()
+  return self.old_rotation ~= self.rotation
+end
+
+function body:scale_changed()
+  return self.old_scalex ~= self.scalex or
+         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
+  self.old_scalex, self.old_scaley = self.scalex, self.scaley
+end
+
 function body:newGrid(frameWidth, frameHeight, imageWidth, imageHeight, left, top, border)
   return anim8.newGrid(
     frameWidth, frameHeight, 
@@ -162,6 +204,7 @@ function body:pauseAtEnd() self.animation:pauseAtEnd() end
 function body:pauseAtStart() self.animation:pauseAtStart() end
 
 function body:update(dt)
+  self:refresh()
   if self.type == "animation" and self.animation then
     local frame = self.animation.frames[self.animation.position]
     _,_,self.width, self.height = frame:getViewport()
@@ -173,12 +216,29 @@ function body:update(dt)
   end
 end
 
+function body:rotate(angle)
+  self:setRotation(self.rotation + angle)
+end
+
+function body:setRotation(angle)
+  self.rotation = angle
+end
+
+function body:scale(sx, sy)
+  self.scalex = self.scalex + sx
+  self.scaley = self.scaley + (sy or sx)
+end
+
+function body:setScale(sx, sy)
+  self.scalex = sx
+  self.scaley = sy or sx
+end
+
 -- set position
 function body:setPosition(x, y)
   if x ~= self.x or y ~= self.y then
     self.x = x
     self.y = y
-    self:refresh()
   end
 end
 
@@ -190,7 +250,6 @@ function body:move(x, y)
   if y then
     self.y = self.y + y
   end
-  self:refresh()
 end
 
 -- get x position
@@ -218,19 +277,11 @@ function body:getImageHeight()
   return self.imgHeight
 end
 
--- set dimension
-function body:setDimension(width, height)
-  self.width = width
-  self.height = height
-  self:refresh()
-end
-
 -- set offset
 function body:setOffset(ox, oy)
   if ox ~= self.ox or oy ~= self.oy then
     self.ox = ox
     self.oy = oy
-    self:refresh()
   end
 end
 
@@ -453,11 +504,18 @@ function body:setShadowType(type, ...)
     self.ox = args[2] or 0
     self.oy = args[3] or 0
   elseif self.shadowType == "rectangle" then
+    self.shadowType = "polygon"
     self.width = args[1] or 64
     self.height = args[2] or 64
     self.ox = args[3] or self.width * 0.5
     self.oy = args[4] or self.height * 0.5
-    self:refresh()
+
+    self.data = {
+      self.x - self.ox,  self.y - self.oy,
+      self.x - self.ox + self.width, self.y - self.oy,
+      self.x - self.ox + self.width, self.y - self.oy + self.height,
+      self.x - self.ox,  self.y - self.oy + self.height
+    }
   elseif self.shadowType == "polygon" then
     self.data = args or {0, 0, 0, 0, 0, 0}
   elseif self.shadowType == "image" then
@@ -507,16 +565,16 @@ function body:inRange(l, t, w, h, s)
 end
 
 function body:drawAnimation()
-  self.animation:draw(self.img, self.x - self.ix, self.y - self.iy)
+  self.animation:draw(self.img, self.x, self.y, self.rotation, self.scalex, self.scaley, self.ix, self.iy)
 end
 
 function body:drawNormal()
   if not self.refraction and not self.reflection and self.normalMesh then
     love.graphics.setColor(255, 255, 255)
     if self.type == 'animation' then
-      self.animation:draw(self.normal, self.x - self.nx, self.y - self.ny)
+      self.animation:draw(self.normal, self.x, self.y, self.rotation, self.scalex, self.scaley, self.nx, self.ny)
     else
-      love.graphics.draw(self.normalMesh, self.x - self.nx, self.y - self.ny)
+      love.graphics.draw(self.normalMesh, self.x, self.y, self.rotation, self.scalex, self.scaley, self.nx, self.ny)
     end
   end
 end
@@ -526,8 +584,6 @@ function body:drawGlow()
 
   if self.type == "circle" then
     love.graphics.circle("fill", self.x, self.y, self.radius)
-  elseif self.type == "rectangle" then
-    love.graphics.rectangle("fill", self.x, self.y, self.width, self.height)
   elseif self.type == "polygon" then
     love.graphics.polygon("fill", unpack(self.data))
   elseif (self.type == "image" or self.type == "animation") and self.img then
@@ -541,9 +597,9 @@ function body:drawGlow()
     end
 
     if self.type == "animation" then
-      self.animation:draw(self.img, self.x - self.ix, self.y - self.iy)
+      self.animation:draw(self.img, self.x, self.y, self.rotation, self.scalex, self.scaley, self.ix, self.iy)
     else
-      love.graphics.draw(self.img, self.x - self.ix, self.y - self.iy)
+      love.graphics.draw(self.img, self.x, self.y, self.rotation, self.scalex, self.scaley, self.ix, self.iy)
     end
 
     love.graphics.setShader()
@@ -554,10 +610,10 @@ 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(self.normal, self.x - self.nx, self.y - self.ny)
+      love.graphics.draw(self.normal, self.x, self.y, self.rotation, self.scalex, self.scaley, self.nx, self.ny)
     else
       self.normalMesh:setVertices(self.normalVert)
-      love.graphics.draw(self.normalMesh, self.x - self.nx, self.y - self.ny)
+      love.graphics.draw(self.normalMesh, self.x, self.y, self.rotation, self.scalex, self.scaley, self.nx, self.ny)
     end
   end
 
@@ -566,14 +622,12 @@ function body:drawRefraction()
   if not self.refractive then
     if self.type == "circle" then
       love.graphics.circle("fill", self.x, self.y, self.radius)
-    elseif self.type == "rectangle" then
-      love.graphics.rectangle("fill", self.x, self.y, self.width, self.height)
     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, self.y - self.iy)
+      love.graphics.draw(self.img, self.x, self.y, self.rotation, self.scalex, self.scaley, self.ix, self.iy)
     elseif self.type == 'animation' then
-      self.animation:draw(self.img, self.x - self.ix, self.y - self.iy)
+      self.animation:draw(self.img, self.x, self.y, self.rotation, self.scalex, self.scaley, self.ix, self.iy)
     end
   end
 end
@@ -582,21 +636,21 @@ 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, self.y - self.ny)
+    love.graphics.draw(self.normalMesh, self.x, self.y, self.rotation, self.scalex, self.scaley, self.nx, self.ny)
   end
   if self.reflective and self.img then
     love.graphics.setColor(0, 255, 0)
     if self.type == 'animation' then
-      self.animation:draw(self.img, self.x - self.ix, self.y - self.iy)
+      self.animation:draw(self.img, self.x, self.y, self.rotation, self.scalex, self.scaley, self.ix, self.iy)
     else
-      love.graphics.draw(self.img, self.x - self.ix, self.y - self.iy)
+      love.graphics.draw(self.img, self.x, self.y, self.rotation, self.scalex, self.scaley, self.ix, self.iy)
     end
   elseif not self.reflection and self.img then
     love.graphics.setColor(0, 0, 0)
     if self.type == 'animation' then
-      self.animation:draw(self.img, self.x - self.ix, self.y - self.iy)
+      self.animation:draw(self.img, self.x, self.y, self.rotation, self.scalex, self.scaley, self.ix, self.iy)
     else
-      love.graphics.draw(self.img, self.x - self.ix, self.y - self.iy)
+      love.graphics.draw(self.img, self.x, self.y, self.rotation, self.scalex, self.scaley, self.ix, self.iy)
     end
   end
 end
@@ -607,9 +661,9 @@ function body:drawMaterial()
     love.graphics.setColor(255, 255, 255)
     self.materialShader:send("material", self.material)
     if self.type == 'animation' then
-      self.animation:draw(self.normal, self.x - self.nx, self.y - self.ny)
+      self.animation:draw(self.normal, self.x, self.y, self.rotation, self.scalex, self.scaley, self.nx, self.ny)
     else
-      love.graphics.draw(self.normal, self.x - self.nx, self.y - self.ny)
+      love.graphics.draw(self.normal, self.x, self.y, self.rotation, self.scalex, self.scaley, self.nx, self.ny)
     end
     love.graphics.setShader()
   end
@@ -617,7 +671,7 @@ end
 
 function body:drawStencil()
   if not self.refraction and not self.reflection and not self.castsNoShadow then
-    love.graphics.draw(self.img, self.x - self.ix, self.y - self.iy)
+    love.graphics.draw(self.img, self.x, self.y, self.rotation, self.scalex, self.scaley, self.ix, self.iy)
   end
 end
 
@@ -627,7 +681,7 @@ function body:drawShadow(light)
   end
    
   love.graphics.setColor(self.red, self.green, self.blue, self.alpha)
-  if self.shadowType == "rectangle" or self.shadowType == "polygon" then
+  if self.shadowType == "polygon" then
     self:drawPolyShadow(light)
   elseif self.shadowType == "circle" then
     self:drawCircleShadow(light)
@@ -721,7 +775,7 @@ function body:drawImageShadow(light)
     {0, shadowStartY, 0, 1, self.red, self.green, self.blue, self.alpha}
   })
 
-  love.graphics.draw(self.shadowMesh, self.x - self.ox, self.y - self.oy, 0, s, s)
+  love.graphics.draw(self.shadowMesh, self.x, self.y, self.rotation, self.scalex, self.scaley, self.ox, self.oy)
 end
 
 return setmetatable({new = new}, {__call = function(_, ...) return new(...) end})

lib/vector.lua

@@ -43,4 +43,23 @@ function vector:dist(b)
   return math.sqrt(math.pow(b.x - self.x, 2) + math.pow(b.y-self.y, 2))
 end
 
+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
+end
+
 return setmetatable({new = new}, {__call = function(_, ...) return new(...) end})