Camera实现动画Papaer效果

来源：互联网发布：ubuntu中文语言包 apt 编辑：程序博客网时间：2024/04/30 07:55

https://github.com/Ramotion/folding-cell-android

paperw work分析

package com.ramotion.foldingcell.animations;import android.graphics.Camera;import android.graphics.Matrix;import android.view.animation.Animation;import android.view.animation.Interpolator;import android.view.animation.Transformation;/** * Main piece of fold animation */public class FoldAnimation extends Animation {    public enum FoldAnimationMode {        FOLD_UP, UNFOLD_DOWN, FOLD_DOWN, UNFOLD_UP    }    private final FoldAnimationMode mFoldMode;    private float mFromDegrees;    private float mToDegrees;    private float mCenterX;    private float mCenterY;    private Camera mCamera;    public FoldAnimation(FoldAnimationMode foldMode, long duration) {        this.mFoldMode = foldMode;        this.setFillAfter(true);        this.setDuration(duration);    }    public FoldAnimation withAnimationListener(AnimationListener animationListener) {        this.setAnimationListener(animationListener);        return this;    }    public FoldAnimation withStartOffset(int offset) {        this.setStartOffset(offset);        return this;    }    public FoldAnimation withInterpolator(Interpolator interpolator) {        if (interpolator != null) {            this.setInterpolator(interpolator);        }        return this;    }    @Override    public void initialize(int width, int height, int parentWidth, int parentHeight) {        super.initialize(width, height, parentWidth, parentHeight);        this.mCamera = new Camera();        this.mCenterX = width / 2;        switch (mFoldMode) {            case FOLD_UP:                this.mCenterY = 0;                this.mFromDegrees = 0;                this.mToDegrees = 90;                break;            case FOLD_DOWN:                this.mCenterY = height;                this.mFromDegrees = 0;                this.mToDegrees = -90;                break;            case UNFOLD_UP:                this.mCenterY = height;                this.mFromDegrees = -90;                this.mToDegrees = 0;                break;            case UNFOLD_DOWN:                this.mCenterY = 0;                this.mFromDegrees = 90;                this.mToDegrees = 0;                break;            default:                throw new IllegalStateException("Unknown animation mode.");        }    }    @Override    protected void applyTransformation(float interpolatedTime, Transformation t) {        final Camera camera = mCamera;        final Matrix matrix = t.getMatrix();        final float fromDegrees = mFromDegrees;        final float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);        camera.save();        camera.rotateX(degrees);        camera.getMatrix(matrix);        camera.restore();        matrix.preTranslate(-mCenterX, -mCenterY);        matrix.postTranslate(mCenterX, mCenterY);    }    @Override    public String toString() {        return "FoldAnimation{" +                "mFoldMode=" + mFoldMode +                ", mFromDegrees=" + mFromDegrees +                ", mToDegrees=" + mToDegrees +                '}';    }}

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