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lin.zhang01
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使用数学向量原理实现view上的贴纸功能
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‎.gitignore‎

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# kdiff3 ignore
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*.orig
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# maven ignore
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target/
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# eclipse ignore
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.settings/
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.project
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.classpath
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# idea ignore
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.idea/
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*.ipr
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*.iml
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*.iws
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# temp ignore
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*.log
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*.cache
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*.diff
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*.patch
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*.tmp
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# system ignore
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.DS_Store
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Thumbs.db
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# package ignore (optional)
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# *.jar
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# *.war
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# *.zip
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# *.tar
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# *.tar.gz
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local.properties
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build/
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app/build/
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.gradle/
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**/*.iml

‎app/.gitignore‎

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/build

‎app/build.gradle‎

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apply plugin: 'com.android.application'
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android {
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compileSdkVersion 26
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defaultConfig {
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applicationId "com.zhanglin.labelview"
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minSdkVersion 16
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targetSdkVersion 26
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versionCode 1
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versionName "1.0"
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testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
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}
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buildTypes {
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release {
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minifyEnabled false
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proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
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}
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}
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}
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dependencies {
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implementation fileTree(dir: 'libs', include: ['*.jar'])
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implementation 'com.android.support:appcompat-v7:26.1.0'
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implementation 'com.android.support.constraint:constraint-layout:1.0.2'
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testImplementation 'junit:junit:4.12'
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androidTestImplementation 'com.android.support.test:runner:1.0.1'
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androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
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}

‎app/proguard-rules.pro‎

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# Add project specific ProGuard rules here.
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# You can control the set of applied configuration files using the
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# proguardFiles setting in build.gradle.
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#
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# For more details, see
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# http://developer.android.com/guide/developing/tools/proguard.html
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# If your project uses WebView with JS, uncomment the following
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# and specify the fully qualified class name to the JavaScript interface
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# class:
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#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
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# public *;
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#}
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# Uncomment this to preserve the line number information for
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# debugging stack traces.
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#-keepattributes SourceFile,LineNumberTable
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# If you keep the line number information, uncomment this to
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# hide the original source file name.
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#-renamesourcefileattribute SourceFile

‎app/src/androidTest/java/com/zhanglin/labelview/ExampleInstrumentedTest.java‎

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package com.zhanglin.labelview;
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import android.content.Context;
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import android.support.test.InstrumentationRegistry;
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import android.support.test.runner.AndroidJUnit4;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import static org.junit.Assert.*;
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/**
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* Instrumented test, which will execute on an Android device.
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*
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* @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
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*/
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@RunWith(AndroidJUnit4.class)
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public class ExampleInstrumentedTest {
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@Test
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public void useAppContext() throws Exception {
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// Context of the app under test.
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Context appContext = InstrumentationRegistry.getTargetContext();
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assertEquals("com.zhanglin.labelview", appContext.getPackageName());
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}
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}

‎app/src/main/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.zhanglin.labelview">
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<application
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android:allowBackup="true"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:roundIcon="@mipmap/ic_launcher_round"
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android:supportsRtl="true"
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android:theme="@style/AppTheme">
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<activity android:name=".MainActivity">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎app/src/main/java/com/zhanglin/labelview/MainActivity.java‎

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package com.zhanglin.labelview;
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import android.support.v7.app.AppCompatActivity;
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import android.os.Bundle;
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import android.view.View;
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import com.zhanglin.labelview.view.LabelTextView;
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public class MainActivity extends AppCompatActivity {
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private boolean isShow = true;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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findViewById(R.id.label).setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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isShow = !isShow;
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((LabelTextView) v).showOrHideLabel(isShow);
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}
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});
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}
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}

‎app/src/main/java/com/zhanglin/labelview/util/MyPointF.java‎

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package com.zhanglin.labelview.util;
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import android.graphics.Point;
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public class MyPointF extends android.graphics.PointF implements Cloneable {
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public float z;
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public MyPointF(float x, float y) {
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this(x, y, 0f);
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}
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public MyPointF(float x, float y, float z) {
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super(x, y);
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this.z = z;
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}
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public MyPointF moveTo(Phasor v, float len) {
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return moveTo(v, len, false);
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}
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public MyPointF moveTo(Phasor v, float len, boolean isDirectionPhasor) {
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if (isDirectionPhasor) {
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this.x = this.x + v.x * len;
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this.y = this.y + v.y * len;
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} else {
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Phasor v0 = v.getDirectionPhasor();
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this.x = this.x + v0.x * len;
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this.y = this.y + v0.y * len;
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}
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return this;
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}
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public MyPointF moveTo(Phasor v) {
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this.x = this.x + v.x;
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this.y = this.y + v.y;
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return this;
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}
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public Point toPoint() {
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return new Point(Math.round(this.x), Math.round(this.y));
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}
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public MyPointF clone() {
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return new MyPointF(x, y);
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}
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@Override
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public String toString() {
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String str = "(%f,%f,%f)";
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return String.format(str, x, y, z);
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}
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}

‎app/src/main/java/com/zhanglin/labelview/util/Phasor.java‎

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package com.zhanglin.labelview.util;
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public class Phasor implements Cloneable {
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float x;
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float y;
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//z 屏幕内外方向
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float z;
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public Phasor() {
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x = 0;
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y = 0;
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z = 0;
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}
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public Phasor(float dx, float dy) {
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this(dx, dy, 0f);
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}
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public Phasor(float dx, float dy, float dz) {
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this.x = dx;
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this.y = dy;
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this.z = dz;
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}
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//p1->p2
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public Phasor(MyPointF p1, MyPointF p2) {
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this.x = p2.x - p1.x;
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this.y = p2.y - p1.y;
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this.z = p2.z - p1.z;
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}
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//向量点积
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public float point(Phasor p) {
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return p.x * x + p.y * y + p.z * z;
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}
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//向量叉积
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public Phasor x(Phasor v) {
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float x1 = y * v.z - z * v.y;
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float y1 = z * v.x - x * v.z;
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float z1 = x * v.y - y * v.x;
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return new Phasor(x1, y1, z1);
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}
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public Phasor getDirectionPhasor() {
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float d = (float) Math.sqrt(this.x * this.x + this.y * this.y);
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Phasor p = new Phasor(x / d, y / d);
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return p;
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}
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public float length() {
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return (float) Math.sqrt(x * x + y * y + z * z);
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}
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public void reverse() {
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this.x = -this.x;
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this.y = -this.y;
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this.z = -this.z;
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}
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public double angleBy(Phasor v) {
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float cosx = getDirectionPhasor().point(v.getDirectionPhasor());
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double radians = Math.acos(cosx);
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return radians;
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}
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@Override
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public String toString() {
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String str = "(x=%f,y=%f)";
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return String.format(str, x, y);
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}
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public Phasor clone() {
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return new Phasor(x, y, z);
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}
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//在同屏幕旋转
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public void rotate(double radians) {
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double sint = Math.sin(radians);
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double cost = Math.cos(radians);
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float x1 = (float) (x * cost + y * sint);
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float y1 = (float) (y * cost - x * sint);
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this.x = x1;
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this.y = y1;
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}
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}

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