零、前言
第一次接触SVG时，被它的强大折服，下面两个小例子可以看看
SVG 文字sin型曲线动画、SVG绘制星空效果
Android5.0+也支持矢量图VectorDrawable，是变异削弱版的SVG,但已经非常强大了
本来不想写SVG的path的，但是发现需要用到，还是总结一下吧
留图镇楼
手撕路径动画：
| path变形 | 变形+旋转 |
|---|---|
 |
 |
常规动画
一、SVG的Path
1.SVG中的Path(有点反人类,可忽略)
命令 含义
M/m (x,y)+ 移动当前位置
L/l (x,y)+ 从当前位置绘制线段到指定位置
H/h (x)+ 从当前位置绘制,水平线到达指定的 x 坐标
V/v (x)+ 从当前位置绘制竖直线到达指定的 y 坐标
Z/z 闭合当前路径
C/c (x1,y1,x2,y2,x,y)+ 从当前位置绘制三次贝塞尔曲线到指定位置
S/s (x2,y2,x,y)+ 从当前位置光滑绘制三次贝塞尔曲线到指定位置
Q/q (x1,y1,x,y)+ 从当前位置绘制,二次贝塞尔曲线到指定位置
T/t (x,y)+ 从当前位置光滑绘制,二次贝塞尔曲线到指定位置
A/a (rx,ry,xr,laf,sf,x,y) 从当前位置绘制弧线到指定位置
2.一开始觉得挺好玩,但是看到...
<path d="M886.786268 386.409745l-17.009967-2.551495a267.623477 267.623477 0 0 1-229.634551-229.351052l-2.267996-17.009967h-17.293466a290.586932 290.586932 0 0 0-226.799557 85.049834l-5.38649 5.669989-12.473975 149.687708 41.107419-41.10742a193.913621 193.913621 0 0 1 135.229236-56.699889 243.242525 243.242525 0 0 0 12.473976 40.82392 22.112957 22.112957 0 0 0-9.071982 5.10299L18.710963 859.853821C-13.324474 891.889258 3.968992 954.542636 11.339978 981.475083a23.813953 23.813953 0 0 1 0 3.401993 21.545958 21.545958 0 0 0 6.236988 15.308971l5.10299 5.10299 6.520487 6.236987h2.551495a22.112957 22.112957 0 0 0 5.953488 0h3.685493a264.221484 264.221484 0 0 0 66.905869 11.339978 75.127353 75.127353 0 0 0 54.715394-18.710963l537.51495-534.963455a22.112957 22.112957 0 0 0 5.10299-9.071983 219.712071 219.712071 0 0 0 40.82392 12.473976 194.48062 194.48062 0 0 1-56.699889 135.512735l-40.82392 41.10742 149.404208-12.757475 5.669989-5.38649a290.019934 290.019934 0 0 0 85.049834-226.799557zM134.378738 975.238095c-6.803987 6.803987-26.081949 11.623477-80.230344-3.685493-15.025471-54.148394-10.20598-73.426357-3.685493-79.946843l532.128461-535.530454a293.138427 293.138427 0 0 0 23.813954 32.885935 9.922481 9.922481 0 0 0-3.685493 2.267996l-60.101883 60.101882a21.262458 21.262458 0 0 0 0 30.334441 21.829457 21.829457 0 0 0 15.025471 6.236988 22.396456 22.396456 0 0 0 15.025471-5.953488l60.101882-60.385382a8.221484 8.221484 0 0 0 2.267996-3.685493 235.58804 235.58804 0 0 0 32.885935 23.813953zM779.339978 595.348837l-28.349945 1.984496A234.170543 234.170543 0 0 0 788.128461 453.599114v-17.009967l-17.009967-2.267995A208.939092 208.939092 0 0 1 590.529347 255.149502l-2.551495-17.009967H552.82392A235.871539 235.871539 0 0 0 425.249169 271.875969l2.267996-26.932447a247.211517 247.211517 0 0 1 173.501661-67.189369 310.431894 310.431894 0 0 0 245.227021 245.51052A247.495017 247.495017 0 0 1 779.339978 595.348837z
立马觉得不好玩了，SVG的路径基本上都是用设计软件制作的
咱就乖乖做个伸手党吧，这事交给设计师：svg的资源网站：Iconfont-阿里巴巴矢量图标库
3.SVG转为Android可用Xml
下载的svg在Android可不能直接用哦,你有3种选择：
3.1--AS自带的转换
3.2--网上在线转换:网址
3.3--批量转化：
前两者都是单文件的转化,如果很多文件就有一个一个来
so,我自己写了工具类,批量转化一下：详情可见：第三个工具
工具现在已经使用正则匹配了，更加精确,转换1000+,暂无失误情况
二、VectorDrawable的使用
vector一览：
path标签一览：
1.修改颜色:两种方法
方法1：直接改：fillColor
方法2：使用时：android:tint="@color/red"
2.分组与变换(吾王之剑岂可不正)
用group将path包起来就可以对path进行变换了
<group
android:rotation="-45"
android:scaleX="0.7"
android:scaleY="0.7"
android:translateY="450">
<path
...
<path
...
</group>
3.线条与填充
关于path的知识和填充模式在Android关于Path你所知道的和不知道的一切,讲的很详细，这里就不费神了
三、矢量动画
动画基本套路如下--简单画一个示意图：
1:路径动画：trimPathEnd
1.1--矢量图主体：icon_close.xml
记得为path取个名字(随意)：
android:name="trim_path"
<?xml version="1.0" encoding="utf-8"?>
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="48dp"
android:height="48dp"
android:viewportWidth="1024"
android:viewportHeight="1024">
<path
android:strokeColor="@color/black"
android:strokeWidth="10"
android:name="trim_path"
android:pathData="M548.992 503.744L885.44 167.328a31.968 31.968 0 1 0-45.248-45.248L503.744 458.496 167.328 122.08a31.968 31.968 0 1 0-45.248 45.248l336.416 336.416L122.08 840.16a31.968 31.968 0 1 0 45.248 45.248l336.416-336.416L840.16 885.44a31.968 31.968 0 1 0 45.248-45.248L548.992 503.744z" /></vector>
1.2--objectAnimator动画：trim_path_animator.xml
<?xml version="1.0" encoding="utf-8"?>
<objectAnimator
xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="2000"
android:interpolator="@android:interpolator/linear"
android:propertyName="trimPathEnd"
android:valueFrom="0.0"
android:valueTo="1.0"
android:valueType="floatType"/>
1.3--动画承载体：anima_close.xml
<animated-vector
xmlns:android="http://schemas.android.com/apk/res/android"
android:drawable="@drawable/icon_close">
<target
android:animation="@animator/trim_path_animator"
android:name="trim_path"/>
</animated-vector>
1.4--使用
<ImageView
android:id="@+id/id_iv"
android:layout_width="200dp"
android:layout_height="200dp"
android:src="@drawable/anima_close"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
//点击时：
Drawable drawable = mIdIv.getDrawable();
if (drawable instanceof Animatable){
((Animatable) drawable).start();
}
2.常规动画
非要平移或缩放还是针对View吧，矢量图是有边界的，超出边界不显示
2.1:--颜色动画:color_animator.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:ordering="sequentially">
<objectAnimator
android:duration="2000"
android:propertyName="strokeColor"
android:valueFrom="@color/black"
android:valueTo="@color/red"/>
<objectAnimator
android:duration="2000"
android:propertyName="strokeColor"
android:valueFrom="@color/red"
android:valueTo="@color/black"/>
</set>
2.2:--透明度动画:alpha_animator.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:ordering="sequentially">
<objectAnimator
android:duration="1500"
android:propertyName="strokeAlpha"
android:valueFrom="1f"
android:valueTo="0.5f"/>
<objectAnimator
android:duration="1500"
android:propertyName="strokeAlpha"
android:valueFrom="0.5f"
android:valueTo="1f"/>
</set>
2.3：--旋转动画:rotation_animator_360.xml
<?xml version="1.0" encoding="utf-8"?>
<set
xmlns:android="http://schemas.android.com/apk/res/android"
android:ordering="sequentially">
<objectAnimator
android:duration="1500"
android:propertyName="rotation"
android:valueFrom="0"
android:valueTo="360"/>
<objectAnimator
android:duration="1500"
android:propertyName="rotation"
android:valueFrom="360"
android:valueTo="0"/>
</set>
2.3：矢量图：icon_setting.xml
<?xml version="1.0" encoding="utf-8"?>
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="48dp"
android:height="48dp"
android:viewportWidth="1024"
android:viewportHeight="1024">
<group android:name="container"
android:pivotX="512"
android:pivotY="512">
<path
android:name="setting_path"
android:pathData="M514.216481 977.624786c-55.577806 0.002047-89.432869-13.881149-91.457991-14.734586-6.476505-2.729158-10.8143-8.92937-11.160177-15.94925-0.354064-7.203052-0.674359-14.411221-0.994654-21.620413-0.618077-13.917988-1.257643-28.307719-2.143826-42.354644-0.528026-8.348132-1.026376-8.606005-2.88163-9.564843-6.768147-3.497661-14.646582-6.115278-22.98755-8.885368-7.208169-2.39556-14.662955-4.871961-22.014386-8.124028-4.52199-2.001587-8.719592-4.269233-12.780071-6.462179-4.65809-2.51631-9.058306-4.89345-13.099343-6.385431-4.536316-1.684362-10.599406 3.223415-21.657252 14.137998-2.720971 2.686179-5.535063 5.464455-8.398274 7.985882l-28.677133 25.26236c-5.973038 5.26184-14.663978 6.053879-21.490453 1.958608-94.435813-56.662511-123.892705-127.005602-125.100206-129.972167-2.650363-6.509251-1.333368-13.96199 3.38612-19.168572l27.558659-30.40345c2.249227-2.480494 4.53734-4.933359 6.749728-7.306406 4.301979-4.612041 8.368598-8.971325 12.106736-13.455453 0.12996-0.706081 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android:strokeWidth="8"
android:strokeColor="#000"/>
</group>
</vector>
3.4:动画整合：anima_setting.xml
<animated-vector
xmlns:android="http://schemas.android.com/apk/res/android"
android:drawable="@drawable/icon_setting">
<target
android:name="setting_path"
android:animation="@animator/alpha_animator"/>
<target
android:name="container"
android:animation="@animator/rotation_animator_360"/>
<target
android:animation="@animator/color_animator"
android:name="setting_path"/>
<target
android:animation="@animator/trim_path_animator"
android:name="setting_path"/>
</animated-vector>
使用同上，不赘述了
3.5:路径转换动画
左上角的箭头是不是很惊艳：,第一次看到还以为是代码的效果呢,原来矢量图也可以轻松实现
注意：对路径进行
objectAnimator,前提，path操作符都要一一对应
好吧，看来想躲都躲不掉了，那就来看看svg的path吧
四、SVG的path全指南：
1.操作符：M/m,L/l,H/h,V/v
大写字母都是绝对坐标,小写字母是相对坐标(相对尾点)
<?xml version="1.0" encoding="utf-8"?>
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="48dp"
android:height="48dp"
android:viewportWidth="100"
android:viewportHeight="100">
<!--将指标轴平移-->
<group
android:translateX="4"
android:translateY="4">
<path
android:strokeColor="@color/black"
android:strokeWidth="4"
android:pathData="M0,0 L20 20 0,30,60,60 H 0 V100"/>
</group>
</vector>
2.操作符：CSQT/csqt
注：小写字母也是相对坐标，只演示大写字母,小写字母自己对应一下就行了
C/c是三次贝塞尔：曾经写过一篇详细分析：详见
S/s是简化版的三次贝塞尔，根据一点，自动顺滑，具体怎么顺滑，看个大概吧...
Q/q是二次贝塞尔，三次的都会了，二次的还远吗? T/t简易版二次贝塞尔，需要至少两个才能发挥曲线作用
3.操作符:A/a
A(rx, ry, xr, laf, sf, x,y)----绘制弧线--最复杂的命令
rx - （radius-x）弧线所在椭圆的 x 半轴长
ry - （radius-y）弧线所在椭圆的 y 半轴长
xr - （xAxis-rotation）弧线所在椭圆的长轴角度
laf - （large-arc-flag）是否选择弧长较长的那一段弧
sf - （sweep-flag）是否选择逆时针方向的那一段弧
x, y- 弧的终点位置
五、路径属性动画
好了，知识储备有了，开始画图了，画个箭头和三横还不小case
箭头：M8,50, l100,0 M0,47, l40,40 M0,52 l40 -40
菜单：M0,50, l80,0 M0,80, l80,0 M0,20 l80 0
| path变形 | 变形+旋转 |
|---|---|
|
|
1.将两个path字符串放入string.xml
直接写也可以，但复用不方便
<resources>
<string name="app_name">test</string>
<string name="path_from">M8,50, l100,0 M0,47, l40,40 M0,52 l40 -40 </string>
<string name="path_to">M0,50, l80,0 M0,80, l80,0 M0,20 l80 0</string>
</resources>
2.矢量图：path_test.xml
<?xml version="1.0" encoding="utf-8"?>
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="48dp"
android:height="48dp"
android:viewportWidth="100"
android:viewportHeight="100">
<group
android:translateX="4"
android:translateY="4">
<path
android:pathData="M0,0 A30,50,90,0,1,50,50"
android:strokeWidth="4"
android:strokeColor="@color/black"/>
</group>
</vector>
3.旋转动画：rotation_animator.xml
<?xml version="1.0" encoding="utf-8"?>
<objectAnimator
xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="1000"
android:propertyName="rotation"
android:valueFrom="0"
android:valueTo="180"/>
4.路径动画：path_animator.xml
<?xml version="1.0" encoding="utf-8"?>
<objectAnimator
xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="1000"
android:interpolator="@android:interpolator/linear"
android:propertyName="pathData"
android:valueFrom="@string/path_from"
android:valueTo="@string/path_to"
android:valueType="pathType"/>
5.矢量图文件：icon_path.xml
<?xml version="1.0" encoding="utf-8"?>
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="48dp"
android:height="48dp"
android:viewportWidth="100"
android:viewportHeight="100">
<group android:name="container"
android:translateX="8"
android:pivotX="50"
android:scaleY="0.8"
android:scaleX="0.8"
android:pivotY="50">
<path
android:name="alpha_anim"
android:pathData="@string/path_from"
android:strokeWidth="8"
android:strokeColor="#000"/>
</group>
</vector>
6.整合动画：anima_path.xml
<animated-vector
xmlns:android="http://schemas.android.com/apk/res/android"
android:drawable="@drawable/icon_path">
<target
android:name="alpha_anim"
android:animation="@animator/path_animator"/>
<target
android:name="container"
android:animation="@animator/rotation_animator">
</target>
</animated-vector>
ok,这样就行了，你可以随意定制两个路径，但必须保证两个路径的指令相同，不然会崩
后记：捷文规范
1.本文成长记录及勘误表
| 项目源码 | 日期 | 备注 |
|---|---|---|
| V0.1--github | 2018-12-8 | Android资源res之矢量图完全指南（附赠SVG-path命令分析） |
2.更多关于我
| 笔名 | 微信 | 爱好 | |
|---|---|---|---|
| 张风捷特烈 | 1981462002 | zdl1994328 | 语言 |
| 我的github | 我的简书 | 我的掘金 | 个人网站 |
3.声明
1----本文由张风捷特烈原创,转载请注明
2----欢迎广大编程爱好者共同交流
3----个人能力有限，如有不正之处欢迎大家批评指证，必定虚心改正
4----看到这里，我在此感谢你的喜欢与支持
