Flutter 实现酷炫的3D效果示例代码
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2022-07-04 17:04:40
此文讲解3个酷炫的3d动画效果。下面是要实现的效果:flutter 中3d效果是通过 transform 组件实现的,没有变换效果的实现:class transformdemo extends sta...
此文讲解3个酷炫的3d动画效果。
下面是要实现的效果:
flutter 中3d效果是通过 transform 组件实现的,没有变换效果的实现:
class transformdemo extends statelesswidget { @override widget build(buildcontext context) { return scaffold( appbar: appbar( title: text('3d 变换demo'), ), body: container( alignment: alignment.center, color: colors.white, child: text('3d 变换demo'), ), ); } }
通过 gesturedetector 组件添加滑动事件监听:
@override widget build(buildcontext context) { return scaffold( appbar: appbar( title: text('3d 变换demo'), ), body: gesturedetector( onpanupdate: (details) { print('$details'); }, child: container( alignment: alignment.center, color: colors.white, child: text('3d 变换demo'), ), ), ); }
添加 transform 对组件进入旋转:
@override widget build(buildcontext context) { return transform( transform: matrix4.identity() ..setentry(3, 2, 0.001) ..rotatex(pi/6) ..rotatey(pi/6), alignment: alignment.center, child: scaffold( appbar: appbar( title: text('3d 变换demo'), ), body: gesturedetector( onpanupdate: (details) { }, child: container( alignment: alignment.center, color: colors.white, child: text('3d 变换demo'), ), ), )); }
将滑动的偏移和旋转进行关联:
class transformdemo extends statefulwidget { @override _transformdemostate createstate() => _transformdemostate(); } class _transformdemostate extends state<transformdemo> { double _rotatex = .0; double _rotatey = .0; @override widget build(buildcontext context) { return transform( transform: matrix4.identity() ..rotatex(_rotatex) ..rotatey(_rotatey), alignment: alignment.center, child: scaffold( appbar: appbar( title: text('3d 变换demo'), ), body: gesturedetector( onpanupdate: (details) { setstate(() { _rotatex += details.delta.dy * .01; _rotatey += details.delta.dx * -.01; }); }, child: container( alignment: alignment.center, color: colors.white, child: text('3d 变换demo'), ), ), )); } }
基本已经实现了3d效果,但效果比较生硬,尤其垂直方向旋转的时候远点和近点在屏幕上的宽度是一样,
添加近大远小的效果:
transform( transform: matrix4.identity() ..setentry(3, 2, 0.001) ..rotatex(_rotatex) ..rotatey(_rotatey), ...
翻书效果
上面的效果类似于翻书的效果。
实现的原理:
将图片左右切割为两部分,两张图片共分割为4个新的组件,如下图,分别为1、2、3、4
代码实现:
_child1 = cliprect( child: align( alignment: alignment.centerleft, widthfactor: 0.5, child: child1, ), ); _child2 = cliprect( child: align( alignment: alignment.centerright, widthfactor: 0.5, child: child1, ), ); _child3 = cliprect( child: align( alignment: alignment.centerleft, widthfactor: 0.5, child: child2, ), ); _child4 = cliprect( child: align( alignment: alignment.centerright, widthfactor: 0.5, child: child2, ), );
将第一张图片放在第二种图片的上面,先旋转 组件2 从 0度到 90度,然后再旋转 组件3 从 -90度到0度,代码实现:
row( mainaxisalignment: mainaxisalignment.center, children: <widget>[ stack( children: [ _child1, transform( alignment: alignment.centerright, transform: matrix4.identity() ..setentry(3, 2, 0.001) ..rotatey(_animation1.value), child: _child3, ), ], ), container( width: 3, color: colors.white, ), stack( children: [ _child4, transform( alignment: alignment.centerleft, transform: matrix4.identity() ..setentry(3, 2, 0.001) ..rotatey(_animation.value), child: _child2, ) ], ) ], )
动画控制器设置:
@override void initstate() { init(); _controller = animationcontroller(vsync: this, duration: duration(seconds: 5)) ..addlistener(() { setstate(() {}); }); _animation = tween(begin: .0, end: pi / 2) .animate(curvedanimation(parent: _controller, curve: interval(.0, .5))); _animation1 = tween(begin: -pi / 2, end: 0.0).animate( curvedanimation(parent: _controller, curve: interval(.5, 1.0))); _controller.forward(); super.initstate(); }
其中 child1, child2为两种图片,代码如下:
_flipupdemostate( container( width: 300, height: 400, child: image.asset( 'assets/images/b.jpg', fit: boxfit.cover, ), ), container( width: 300, height: 400, child: image.asset( 'assets/images/c.jpeg', fit: boxfit.cover, ), ))
最后生成的效果就是开始的翻书效果。
上面是左右翻页效果,同理换成上下翻页效果:
@override widget build(buildcontext context) { return scaffold( appbar: appbar(), body: column( mainaxisalignment: mainaxisalignment.center, children: <widget>[ stack( children: [ _upperchild1, transform( alignment: alignment.bottomcenter, transform: matrix4.identity() ..setentry(3, 2, 0.003) ..rotatex(_animation1.value), child: _upperchild2, ), ], ), sizedbox( height: 2, ), stack( children: [ _lowerchild2, transform( alignment: alignment.topcenter, transform: matrix4.identity() ..setentry(3, 2, 0.003) ..rotatex(_animation.value), child: _lowerchild1, ) ], ) ], ), ); }
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