Sin Path Movement

 

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Sin Path Movement

--©1999 Matthijs Klinkert, buro Zicht, Delft, The Netherlands --Startposition X: enter the X-startposition on the stage in pixels. --Startposition Y: enter the Y-startposition on the stage in pixels. --Speed: enter the speed of movement 1 = slow, 10 = fast. --Amplitude: enter the amplitude of the funtion in pixels. --Period: enter the period of the function in pixels. --Which direction: choose left or right. property pMyXpos, pMyYpos, pSpeed, pPeriod, pAmplitude, pMyDirection on beginSprite me      set the locH of sprite the spriteNum of me = pMyXpos   set the locV of sprite the spriteNum of me = pMyYpos   add(the actorList, me)    end on endSprite me      deleteOne(the actorList,me)    end -- on stepFrame me      if pMyDirection = "Right" then     set pMyXpos = pMyXpos + pSpeed   else     set pMyXpos = pMyXpos - pSpeed   end if      set stageWidth = the stageRight - the stageLeft      if pMyDirection = "Right" then     if pMyXpos > stageWidth then       set pMyXpos = 0     end if   else     if pMyXpos < 0 then       set pMyXpos = stageWidth     end if   end if      set the locH of sprite (the spriteNum of me) = pMyXpos   set x = the locH of sprite the spriteNum of me   set the locV of sprite (the spriteNum of me) = ¬ pMyYpos + integer(float(pAmplitude*(sin((float(pMyXpos)/float(pPeriod))*PI))))   set y = the locV of sprite the spriteNum of me   updateStage    end on getPropertyDescriptionList me     set propList = [#pMyXpos: [#comment: "Startposition X (in pixels)", #format: #integer,¬ #default: 0], #pMyYpos: [#comment: "Startposition Y (in pixels)", #format: #integer,¬ #default: 0], #pSpeed: [#comment: "Speed", #range: [1,2,3,4,5,6,7,8,9,10], #format: #integer,¬ #default: 5], #pAmplitude: [#comment: "Aplitude", #format: #integer, #default: 30], ¬ #pPeriod: [#comment: "Period", #format: #integer, #default: 50], ¬ #pMyDirection: [#comment:"Which direction?", #range: ["Left", "Right"], #format: #string,¬ #default: "Right"]]   return propList   end on getBehaviorDescription me     return "©1999 Matthijs Klinkert, buro Zicht, Delft, The Netherlands" && RETURN && RETURN &¬ "• Startposition X: enter the X-startposition on the stage in pixels."¬ && RETURN &¬ "• Startposition Y: enter the Y-startposition on the stage in pixels." && RETURN &¬ "• Speed: enter the speed of movement 1 = slow, 10 = fast." && RETURN &¬ "• Amplitude: enter the amplitude of the funtion in pixels." && RETURN &¬ "• Period: enter the period of the function in pixels." && RETURN &¬ "• Which direction: choose left or right." end