圆形剪裁(ClipOval)
new ClipOval(
child: new SizedBox(
100.0,
height:100.0,
child: new Image.network("https://sfault-avatar.b0.upaiyun.com/206/120/2061206110-5afe2c9d40fa3_huge256",fit: BoxFit.fill,),
),
),
圆角矩形剪裁(ClipRRect)
new ClipRRect(
borderRadius: new BorderRadius.all(
new Radius.circular(10.0)),
child: new SizedBox(
100.0,
height:100.0,
child: new Image.network("https://sfault-avatar.b0.upaiyun.com/206/120/2061206110-5afe2c9d40fa3_huge256",fit: BoxFit.fill,),
),
)
矩形剪裁(ClipRect)
这个控件需要定义clipper参数才能使用，不然没有效果。
class _MyClipper extends CustomClipper<Rect>{
@override
Rect getClip(Size size) {
return new Rect.fromLTRB(10.0, 10.0, size.width - 10.0, size.height- 10.0);
}
@override
bool shouldReclip(CustomClipper<Rect> oldClipper) {
return true;
}
}
new ClipRect(
clipper: new _MyClipper(),
child:new SizedBox(
100.0,
height:100.0,
child: new Image.network("https://sfault-avatar.b0.upaiyun.com/206/120/2061206110-5afe2c9d40fa3_huge256",fit: BoxFit.fill,),
) ,
),
路径剪裁(ClipPath)
class _StarCliper extends CustomClipper<Path>{
final double radius;
_StarCliper({this.radius});
/// 角度转弧度公式
double degree2Radian(int degree) {
return (Math.pi * degree / 180);
}
@override
Path getClip(Size size) {
double radius = this.radius;
Path path = new Path();
double radian = degree2Radian(36);// 36为五角星的角度
double radius_in = (radius * Math.sin(radian / 2) / Math
.cos(radian)); // 中间五边形的半径
path.moveTo((radius * Math.cos(radian / 2)), 0.0);// 此点为多边形的起点
path.lineTo((radius * Math.cos(radian / 2) + radius_in
* Math.sin(radian)),
(radius - radius * Math.sin(radian / 2)));
path.lineTo((radius * Math.cos(radian / 2) * 2),
(radius - radius * Math.sin(radian / 2)));
path.lineTo((radius * Math.cos(radian / 2) + radius_in
* Math.cos(radian / 2)),
(radius + radius_in * Math.sin(radian / 2)));
path.lineTo(
(radius * Math.cos(radian / 2) + radius
* Math.sin(radian)), (radius + radius
* Math.cos(radian)));
path.lineTo((radius * Math.cos(radian / 2)),
(radius + radius_in));
path.lineTo(
(radius * Math.cos(radian / 2) - radius
* Math.sin(radian)), (radius + radius
* Math.cos(radian)));
path.lineTo((radius * Math.cos(radian / 2) - radius_in
* Math.cos(radian / 2)),
(radius + radius_in * Math.sin(radian / 2)));
path.lineTo(0.0, (radius - radius * Math.sin(radian / 2)));
path.lineTo((radius * Math.cos(radian / 2) - radius_in
* Math.sin(radian)),
(radius - radius * Math.sin(radian / 2)));
path.close();// 使这些点构成封闭的多边形
return path;
}
@override
bool shouldReclip(_StarCliper oldClipper) {
return this.radius != oldClipper.radius;
}
}
先定义好五角星的路径ClipRect,然后:
new ClipPath(
clipper: new _StarCliper(radius: 50.0),
child:new SizedBox(
100.0,
height:100.0,
child: new Image.network("https://sfault-avatar.b0.upaiyun.com/206/120/2061206110-5afe2c9d40fa3_huge256",fit: BoxFit.fill,),
) ,
)
转载：https://segmentfault.com/a/1190000015149101?utm_source=index-hottest