topical media & game development
student-ar-org-papervision3d-core-animation-channel-AbstractChannel3D.ax
student-ar-org-papervision3d-core-animation-channel-AbstractChannel3D.ax
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package org.papervision3d.core.animation.channel
{
import org.papervision3d.core.animation.AnimationKeyFrame3D;
import org.papervision3d.objects.DisplayObject3D;
author: Tim Knip
public class @ax-student-ar-org-papervision3d-core-animation-channel-AbstractChannel3D
{
The target for this animation channel.
public var target:DisplayObject3D;
Name of the channel.
public var name:String;
Array of keyframes.
public var keyFrames:Array;
Start time in seconds.
public var startTime:Number;
End time in seconds.
public var endTime:Number;
Current time in seconds.
public var currentTime:Number;
Current keyframe as index into keyFrames array.
public var currentIndex:int;
Next keyframe as index into keyFrames array.
public var nextIndex:int;
Current keyframe.
public var currentKeyFrame:AnimationKeyFrame3D;
Next keyframe.
public var nextKeyFrame:AnimationKeyFrame3D;
Total duration in seconds.
public var duration:Number;
Value between 0 and 1 indicating current position inbetween current and next keyframe.
public var frameAlpha:Number;
Duration of the interval between current and next frame in seconds.
public var frameDuration:Number;
Constructor.
@param parent
@param target
@param name
public function @ax-student-ar-org-papervision3d-core-animation-channel-AbstractChannel3D(target:DisplayObject3D, name:String = null)
{
this.target = target;
this.name = name;
this.startTime = this.endTime = 0;
this.keyFrames = new Array();
this.currentKeyFrame =this.nextKeyFrame = null;
this.currentIndex = this.nextIndex = -1;
this.frameAlpha = 0;
}
Adds a new keyframe.
@param keyframe
@return The added keyframe.
public function addKeyFrame(keyframe:AnimationKeyFrame3D):AnimationKeyFrame3D
{
if(this.keyFrames.length)
{
this.startTime = Math.min(this.startTime, keyframe.time);
this.endTime = Math.max(this.endTime, keyframe.time);
}
else
{
this.startTime = this.endTime = keyframe.time;
}
this.duration = this.endTime - this.startTime;
this.keyFrames.push(keyframe);
this.keyFrames.sortOn("time", Array.NUMERIC);
return keyframe;
}
Updates this channel.
@param keyframe
public function updateToFrame(keyframe:uint):void
{
if(!this.keyFrames.length)
{
return;
}
currentIndex = keyframe;
currentIndex = currentIndex < this.keyFrames.length - 1 ? currentIndex : 0;
nextIndex = currentIndex + 1;
currentKeyFrame = this.keyFrames[currentIndex];
nextKeyFrame = this.keyFrames[nextIndex];
frameDuration = nextKeyFrame.time - currentKeyFrame.time;
frameAlpha = 0;
currentTime = currentKeyFrame.time;
}
Updates this channel by time.
public function updateToTime(time:Number):void
{
currentIndex = Math.floor((this.keyFrames.length-1) * time);
currentIndex = currentIndex < this.keyFrames.length - 1 ? currentIndex : 0;
nextIndex = currentIndex + 1;
currentKeyFrame = this.keyFrames[currentIndex];
nextKeyFrame = this.keyFrames[nextIndex];
frameDuration = nextKeyFrame ? nextKeyFrame.time - currentKeyFrame.time : currentKeyFrame.time;
currentTime = time * this.duration;
frameAlpha = (currentTime - currentKeyFrame.time) / frameDuration;
// clamp between 0 and 1
frameAlpha = frameAlpha < 0 ? 0 : frameAlpha;
frameAlpha = frameAlpha > 1 ? 1 : frameAlpha;
}
}
}
(C) Æliens
04/09/2009
You may not copy or print any of this material without explicit permission of the author or the publisher.
In case of other copyright issues, contact the author.
