[Anark] Follow Mouse (Interactive Behavior)

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发表于 2011-10-21 08:15:00 |只看该作者 |倒序浏览

            Follow Mouse (Interactive Behavior)


         Summary


         Causes the object to follow the mouse around the screen.


            Category


            Latest Behaviors


            Author


            Gavin Kistner


            Difficulty


            (Reference)


            Time to Complete


            5 Minutes


         Downloads


         Click Here

         to download the associated files.


         (This document covers version 1.0.1 of the 'Follow Mouse' behavior, current as of 2005-Feb-11)


         Description


         The

            When to Follow

         property controls when the object follows the mouse. By default, the object always follows the mouse, but you can have it only occur when the mouse is down (much like the Draggable behavior), when a certain key is down, or a variety of other events. If you use the last option, “

            (Action Controlled)

         ”, the object will only start following the mouse when the Start Following action is invoked on this behavior.


         By default, the object reacts instantly to changes in the mouse position. The various Advanced Properties described below allow you to control how the object follows the mouse.


         The

            Follow Delay

         property specifies how many frames the object should wait before following the mouse. For example, a value of ‘10’ means that the object will try to move to where the mouse was 10 frames ago, while the default value of 0 causes it to always move to where the mouse is right now.


         The

            Screen Offset

         property specifies a fixed offset (in pixels) from the mouse position that the object should move towards. For example, a value of “50, -20, 0” will cause the object to move to a spot 50 pixels to the right and 20 pixels below where the cursor is. (The z value is always ignored.)


         The

            Spring Tension

         property controls how hard the object is pulled to the desired spot. A value of 100 causes it to instantly snap to the desired spot, while a value of 50 causes it to move 50% of the distance each frame. Lower values give the object a smoother reaction to changes in the mouse position.


         Finally, the

            Holdoff Distance

         is a fixed distance (in the object space) that the object should stay away from the mouse. This is similar to the

            Screen Offset

         , but


         a) it is specified in world units, not pixels, and


         b) it specifies only distance, not location.


         Think of

            Holdoff Distance

         as a rigid pole attached between the end position and the object, which can pivot on both ends. The object will chase the mouse but stop before catching it, and if the mouse moves toward the object, it will push off to ensure it stays away from the mouse.


         All properties can be used in any combination. (Although some combinations may produce ‘interesting’ effects.)


         Basic Properties


            When to Follow


            When is this behavior active?


            Trigger Key


            If 'When to Follow' is 'Key Down', the name of the key to watch for.


            Stop on Reverse?


            Stop following the mouse when the 'opposite' event occurs?


         Advanced Properties


            Follow Delay


            Number of frames behind the mouse to trail.


            Screen Offset


            Fixed X/Y offset from the mouse for the object move to.


            Spring Tension


            How strong is the 'spring' between the object and the mouse? (100 is a rigid attachment.)


            Holdoff Distance


            Distance away from the the mouse/offset to keep.


         Actions


            Start Following


            Start applying this behavior.


            Stop Following


            Stop applying this behavior.


            Toggle


            If the parent is following the mouse, stop it; otherwise, start it.


         Events


            Started


            Fires when the behavior is started.


            Stopped


            Fires when the behavior is stopped.


         Demonstration


            View Demonstration Project


            Download Project File