improvement: use a 360 motion system

sonic-radiance.love/scenes/battlesystem/actors/movable.lua

@@ -28,6 +28,8 @@ end
 function Movable:initMovementSystem()
   self.xprevious, self.yprevious, self.zprevious  = self.x, self.y, self.z
   self.xspeed, self.yspeed, self.zspeed = 0,0,0
+  self.speed = 0
+  self.angle = 0
   self.direction = self.start.direction
   self.directionPrevious = self.start.direction
   self.directionLocked = false
@@ -43,6 +45,7 @@ end
 
 function Movable:stopMoving()
   self.xspeed, self.yspeed, self.zspeed = 0,0,0
+  self.speed = 0
   if (self.movementType == MOVEMENT_TWEENER) then
     self:unlockTag("goTo")
     self.tweens:removeNamedTween("goTo")
@@ -108,13 +111,18 @@ end
 
 -- MOTION HANDLING
 
-function Movable:setMotion(xspeed, yspeed)
-  self.xspeed = xspeed
-  self.yspeed = yspeed
+function Movable:setMotion(speed, angle)
+  self.speed = speed
+  self.angle = angle
   self.movementType = MOVEMENT_MOTION
 end
 
+function Movable:setMotionToPoint(speed, dx, dy)
+    self:setMotion(speed, utils.math.pointDirection(self.x, self.y, dx, dy))
+end
+
 function Movable:updateMotion(dt)
+  self.xspeed, self.yspeed = utils.math.lengthdir(self.speed, self.angle)
   self.x = self.x + (self.xspeed) * dt
   self.y = self.y + (self.yspeed) * dt
 end
@@ -160,11 +168,9 @@ end
 
 function Movable:jumpTo(dx, dy, height, speed, useDefaultAnimation)
   height = height or 4
-  speed = speed or 8
+  self:setMotionToPoint(speed, dx, dy)
+
   self:setJump(height, 0, useDefaultAnimation)
-  local dir = utils.math.pointDirection(self.x, self.y, dx, dy)
-  local hspeed, vspeed = utils.math.lengthdir(speed, dir)
-  self:setMotion(hspeed, vspeed)
   self.jump.isMotionJump = true
 end