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How to make a body jump while moving in an ellipse — Gideros Forum
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    How to make a body jump while moving in an ellipse

    simransimran Member
    edited May 2014 in General questions
    I have given piece of code for a game that is to be played in landscape left mode. first piece of code is executed as soon as the player enters the frame and this results in motion of player along an ellipse. the code inside first else is executed when user touches the screen and at this moment I want the player to jump, and code inside second jump is executed when touch ends that is player gets back to initial position, please help me what shall be the code to make the player jump while in elliptical motion

    if playertouch == false then
    if playertouchend == false then
    x = 215 + math.cos(angle)*195
    y = 130 + math.sin(angle)*115
    else
    --code to jump here
    end
    else
    --code to get back down

    end

    Likes: Yan

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    Comments

    • simransimran Member
      To, jump, I need to use Z axis , right? or is it possible to do it alone using angle?, please? and it's possible only with z axis, how to do that, since setPosition allows only x, y psitions to set, help :/
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    • amin13aamin13a Member
      Hi simran
      Try this Code:(just copy it to main.lua)
      -- You can jump by holding touch and back by release! (Sorry for my English :D)
      application:setOrientation("landscapeLeft") -- good in 480*800


      local xc = 400 -- X center of Ellipse
      local yc = 200 -- Y center of Ellipse
      local a = 400 -- big radius
      local b = 100 -- small radius
      local speed = 0.5 -- speed of rotating
      local jump = 0
      local maxjump = 50 -- can jump THIS pixel above
      local jumpspeed = 1 -- speed of jumping

      local theta = 0
      local degree = math.pi / 180
      local sinus = math.sin
      local cosinus = math.cos

      local sprite = gideros.class(Sprite)
      function sprite:init()
      self.jump = false
      local mesh = Mesh.new()
      mesh:setVertex(1,0,0)
      mesh:setVertex(2,10,0)
      mesh:setVertex(3,10,30)
      mesh:setVertex(4,0,30)
      mesh:setIndices(1,1,2,2,3,3,4,1,5,3,6,4)
      mesh:setColorTransform(0.9,0,0,1)
      self:addChild(mesh)
      self:addEventListener(Event.ENTER_FRAME, self.onEnterFrame,self)
      self:addEventListener(Event.TOUCHES_BEGIN, self.onTouchesBegin, self)
      self:addEventListener(Event.TOUCHES_END, self.onTouchesEnd, self)


      end
      function sprite:onEnterFrame()
      if theta > 3600 then
      theta = 3600 - theta
      end
      if self.jump and jump < maxjump then
      jump = jump + jumpspeed
      elseif jump > 0 then
      jump = jump - jumpspeed
      end

      local angle = theta*degree
      local x = xc + a * cosinus(angle)
      local y = yc + b * sinus(angle) - jump
      self:setPosition(x,y)
      theta = theta + speed
      end
      function sprite:onTouchesBegin()
      self.jump = true
      end
      function sprite:onTouchesEnd()
      self.jump = false
      end

      mysprite = sprite.new()
      stage:addChild(mysprite)



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    • simransimran Member
      no, it did not work for me :(
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    • amin13aamin13a Member
      what is exactly your problem? (don't be sad :D)
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    • amin13aamin13a Member
      Gideros is 2D gameEngine and there is no z axis here.
      your body can jump in y axis (like most platform games)
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    • simransimran Member
      edited May 2014
      @amin13a : Okay, no z axis, but I need a combination of x and y movement while it jumps,
      this is what I am using for its motion in ellipse

      x = 215 + math.cos(angle)*195
      y = 130 + math.sin(angle)*115

      Now, what shall i do to make the body jump while it is in motion along the ellipse, I want it to jump in the constraints of the ellipse.
      Any idea, please?

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    • amin13aamin13a Member
      if jump means going further from center of ellipse (but remain on the elliptical path)
      you can change my code by this order:

      local jump = 1
      local maxjump = 1.2 -- can jump THIS pixel above
      local jumpspeed = 0.02 -- speed of jumping



      local x = xc + a * cosinus(angle)* jump
      local y = yc + b * sinus(angle) *jump
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    • amin13aamin13a Member
      Edit:
      elseif jump > 0 then
      must be changed by:
      elseif jump > 1 then
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    • simransimran Member
      Following code worked, Thanks for your help ;D

      if playertouch then
      speed = 10
      angle2 = 30
      speedx = math.cos(20)
      speedy = math.sin(130)
      velocityx = speed*speedx
      velocityy = speed*speedy
      for i = 1, 1 do
      x = x + velocityx
      y = y + velocityy
      self: setScaleY(1.8)
      end

      elseif playertouch == false then
      for i = 1,1 do
      x = x - velocityx
      y = y - velocityy
      x = 215 + math.cos(angle)*195
      y = 130 + math.sin(angle)*115
      self:setScaleY(1)
      end
      else
      x = 215 + math.cos(angle)*195
      y = 130 + math.sin(angle)*115
      end
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