《Pro Android Graphics》讀書筆記之第四節

標籤：android   style   class   blog   c   code   

Android Procedural Animation: : XML, Concepts and OptimizationProcedural Animation Concepts: Tweens and Interpolators 

Interpolator：http://developer.android.com/reference/android/animation/TimeInterpolator.html

Procedural Animation Data Values: Ranges and Pivot Point 

範圍和中心點

Procedural Animation Transforms: Rotate, Scale, Translatescale：One of them involves sizerotation：involves orientation (which direction that something is facing)translation：involves movementProcedural Animation Compositing: Alpha Blending Procedural Animation Timing: Using Duration and Offsets Procedural Animation Loops: RepeatCount and RepeatMode 

repeatCount interger（loop forever use infinite(-1)）

RepeatMode：restart (1)

reverse (2)

The <set> Tag: Using XML to Group Procedural Animation 

android.view.animation

 rule of thumb is to apply your transformational parameters locally

Procedural Animation vs. Frame Animation: The Trade-Off Frame Animation

memory intensive（需要更多記憶體）：Displaying the image from memory onto the View is fairly straightforward and does not require any complex calculations, so all processing involves moving each frame’s image asset from memory over to display screen.

Procedural animation 

tends to be more processing intensive（需要更多計算）

Creating a Procedural Animation Definition Using XML

Animation pagAni = AnimationUtils.loadAnimation(this, R.anim.pag_anim);（view）pag.startAnimation(pagAni);

Using Set to Create a More Complex Procedural Animation Rotation Transformation: Going a Bit Too Far with FX Tweaking Transform Values: The Ease of Adjusting XML