自定义View——游动锦鲤实践

一个对于自定义View的尝试，主要用于尝试熟悉自定义View的实现过程，有些小瑕疵。

布局文件

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><ImageViewandroid:id="@+id/iv_fish"android:layout_width="wrap_content"android:layout_height="wrap_content"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent" /></androidx.constraintlayout.widget.ConstraintLayout>

使用布局——MainAvtivity

package com.hnucm.otherapp;import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ImageView ivFish = findViewById(R.id.iv_fish);ivFish.setImageDrawable(new FishDrawable());}
}

主要实现——FishDrawable

package com.hnucm.otherapp;import android.animation.ValueAnimator;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PixelFormat;
import android.graphics.Point;
import android.graphics.PointF;
import android.graphics.drawable.Drawable;
import android.view.animation.LinearInterpolator;
import android.widget.HeaderViewListAdapter;import androidx.annotation.NonNull;
import androidx.annotation.Nullable;/*** @author created by lvjunkai* @date 2021-09-27* @description: 实现一个自定义锦鲤的绘制*/
public class FishDrawable extends Drawable {//路径private Path mPath;//画笔private Paint mPaint;//身体外透明度private final static int OTHER_ALPHA = 110;//身体透明度private final static int BODY_ALPHA = 160;//鱼头半径，用于改变鱼的大小private final static int HEAD_RADIUS = 150;//坐标private PointF middlePoint;//鱼朝向private float fishMainAngle = 90;//鱼身长度private final static float BODY_LENGTH = 3.2f * HEAD_RADIUS;//寻找鱼鳍起点的线长private final static float FIND_FINS_LENGTH = 0.9f * HEAD_RADIUS;//鱼鳍的长度private final static float FINS_LENGTH = 1.3f * HEAD_RADIUS;//-------------鱼尾----------------//尾部大圆的半径（圆心就是身体底部的中点）private final static float BIG_CIRCLE_RADIUS = HEAD_RADIUS * 0.7f;//尾部中圆的半径private final static float MIDDLE_CIRCLE_RADIUS = BIG_CIRCLE_RADIUS * 0.6f;//尾部小圆的半径private final static float SMALL_CIRCLE_RADIUS = MIDDLE_CIRCLE_RADIUS * 0.4f;// --寻找尾部中圆圆心的线长private final static float FIND_MIDDLE_CIRCLE_LENGTH = BIG_CIRCLE_RADIUS + MIDDLE_CIRCLE_RADIUS;// --寻找尾部小圆圆心的线长private final static float FIND_SMALL_CIRCLE_LENGTH = MIDDLE_CIRCLE_RADIUS * (0.4f + 2.7f);// --寻找大三角形底边中心点的线长private final static float FIND_TRIANGLE_LENGTH = MIDDLE_CIRCLE_RADIUS * 2.7f;private float currentValue = 0;private float currentValue1 = 0;private float currentValue2 = 0;//构造函数，用于初始化drawablepublic FishDrawable(){init();}//初始化private void init(){mPath = new Path();//路径mPaint = new Paint();//画笔mPaint.setAntiAlias(true);//抗锯齿mPaint.setDither(true);//防抖mPaint.setStyle(Paint.Style.FILL);//画笔类型填充mPaint.setARGB(OTHER_ALPHA,244,92,71);//设置颜色//鱼重心的坐标middlePoint = new PointF(4.18f * HEAD_RADIUS,4.18f * HEAD_RADIUS);//属性动画ValueAnimator valueAnimator = ValueAnimator.ofFloat(0,360);
//        ValueAnimator valueAnimator = ValueAnimator.ofFloat(-1,1);valueAnimator.setDuration(1000);
//        valueAnimator.setRepeatMode(ValueAnimator.REVERSE);valueAnimator.setRepeatMode(ValueAnimator.RESTART);valueAnimator.setRepeatCount(ValueAnimator.INFINITE);valueAnimator.setInterpolator(new LinearInterpolator());valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animator) {currentValue = (float) animator.getAnimatedValue();invalidateSelf();}});valueAnimator.start();}//绘制@Overridepublic void draw(@NonNull Canvas canvas) {//        float fishAngle = fishMainAngle + currentValue * 20;
//        float fishAngle = fishMainAngle + currentValue * 10;float fishAngle = (float) (fishMainAngle + Math.sin(Math.toRadians(currentValue * 1)) * 10);//圆心PointF headPoint = calculatePoint(middlePoint,BODY_LENGTH / 2,fishAngle);//以圆心为中心，半径为HEAD_RADIUS，用画笔画圆canvas.drawCircle(headPoint.x,headPoint.y,HEAD_RADIUS,mPaint);//绘制右鱼鳍PointF rightFinsPoint = calculatePoint(headPoint,FIND_FINS_LENGTH,fishAngle - 110);makeFins(canvas,rightFinsPoint,fishAngle,true);//绘制左鱼鳍PointF leftFinsPoint = calculatePoint(headPoint,FIND_FINS_LENGTH,fishAngle + 110);makeFins(canvas,leftFinsPoint,fishAngle,false);//身体底部的中心点PointF bodyBottomCenterPoint = calculatePoint(headPoint,BODY_LENGTH,fishAngle - 180);//画节肢1
//        makeSegment(canvas,bodyBottomCenterPoint,BIG_CIRCLE_RADIUS,MIDDLE_CIRCLE_RADIUS,
//                FIND_MIDDLE_CIRCLE_LENGTH,fishAngle,true);PointF middleCircleCenterPoint = makeSegment(canvas,bodyBottomCenterPoint,BIG_CIRCLE_RADIUS,MIDDLE_CIRCLE_RADIUS,FIND_MIDDLE_CIRCLE_LENGTH,fishAngle,true);//画节肢2
//        PointF middleCircleCenterPoint = calculatePoint(bodyBottomCenterPoint,
//                FIND_MIDDLE_CIRCLE_LENGTH,fishAngle - 180);makeSegment(canvas,middleCircleCenterPoint,MIDDLE_CIRCLE_RADIUS,SMALL_CIRCLE_RADIUS,FIND_SMALL_CIRCLE_LENGTH,fishAngle,false);//画尾巴makeTriangle(canvas,middleCircleCenterPoint,FIND_TRIANGLE_LENGTH,BIG_CIRCLE_RADIUS,fishAngle);makeTriangle(canvas,middleCircleCenterPoint,FIND_TRIANGLE_LENGTH - 10,BIG_CIRCLE_RADIUS - 20,fishAngle);//画身体makeBody(canvas,headPoint,bodyBottomCenterPoint,fishAngle);}//绘制鱼鳍private void makeFins(Canvas canvas, PointF startPoint, float fishAngle,boolean isRightFins) {float controlAngle = 115;//二阶贝塞尔曲线的控制点坐标PointF controlPoint = calculatePoint(startPoint,1.8f * FINS_LENGTH,isRightFins ? fishAngle - controlAngle : fishAngle + controlAngle);//结束点坐标PointF endPoint = calculatePoint(startPoint,FINS_LENGTH,fishAngle - 180);mPath.reset();mPath.moveTo(startPoint.x,startPoint.y);mPath.quadTo(controlPoint.x,controlPoint.y,endPoint.x,endPoint.y);canvas.drawPath(mPath,mPaint);}//绘制节肢private PointF makeSegment(Canvas canvas,PointF bottomCenterPoint,float bigRadius,float smallRadius,float findSmallCircleLength,float fishAngle,boolean hasBigCircle){float segmentAngle;if(hasBigCircle){//            segmentAngle = fishAngle + currentValue * 30;segmentAngle = (float) (fishAngle + Math.sin(Math.toRadians(currentValue * 2)) * 30);}else{//            segmentAngle = fishAngle + currentValue * 50;segmentAngle = (float) (fishAngle + Math.sin(Math.toRadians(currentValue * 3)) * 50);}//梯形上底的中心点（中等大的圆的圆心）
//        PointF upperCenterPoint = calculatePoint(bottomCenterPoint,findSmallCircleLength,
//                fishAngle - 180);PointF upperCenterPoint = calculatePoint(bottomCenterPoint,findSmallCircleLength,segmentAngle - 180);//梯形的四个点
//        PointF bottomLeftPoint = calculatePoint(bottomCenterPoint,bigRadius,fishAngle + 90);
//        PointF bottomRightPoint = calculatePoint(bottomCenterPoint,bigRadius,fishAngle - 90);
//        PointF upperLeftPoint = calculatePoint(upperCenterPoint,smallRadius,fishAngle + 90);
//        PointF upperRightPoint = calculatePoint(upperCenterPoint,smallRadius,fishAngle - 90);PointF bottomLeftPoint = calculatePoint(bottomCenterPoint,bigRadius,segmentAngle + 90);PointF bottomRightPoint = calculatePoint(bottomCenterPoint,bigRadius,segmentAngle - 90);PointF upperLeftPoint = calculatePoint(upperCenterPoint,smallRadius,segmentAngle + 90);PointF upperRightPoint = calculatePoint(upperCenterPoint,smallRadius,segmentAngle - 90);if(hasBigCircle){//画大圆canvas.drawCircle(bottomCenterPoint.x,bottomCenterPoint.y,bigRadius,mPaint);}//画小圆canvas.drawCircle(upperCenterPoint.x,upperCenterPoint.y,smallRadius,mPaint);//画梯形mPath.reset();mPath.moveTo(bottomLeftPoint.x,bottomLeftPoint.y);mPath.lineTo(upperLeftPoint.x,upperLeftPoint.y);mPath.lineTo(upperRightPoint.x,upperRightPoint.y);mPath.lineTo(bottomRightPoint.x,bottomRightPoint.y);canvas.drawPath(mPath,mPaint);//绘制节肢2和三角形的起始点，必须在这儿返回return upperCenterPoint;}//绘制尾巴private void makeTriangle(Canvas canvas, PointF startPoint,float findCenterLength,float findEdgeLength,float fishAngle){//三角形底边的中心点PointF centerPoint = calculatePoint(startPoint,findCenterLength,fishAngle - 180);//三角形底边的两点PointF leftPoint = calculatePoint(centerPoint,findEdgeLength,fishAngle + 90);PointF rightPoint = calculatePoint(centerPoint,findEdgeLength,fishAngle - 90);//绘制三角形mPath.reset();mPath.moveTo(startPoint.x,startPoint.y);mPath.lineTo(leftPoint.x,leftPoint.y);mPath.lineTo(rightPoint.x,rightPoint.y);canvas.drawPath(mPath,mPaint);}//绘制身体private void makeBody(Canvas canvas,PointF headPoint,PointF bodyBottomCenterPoint,float fishAngle){//身体的四个点PointF topLeftPoint = calculatePoint(headPoint,HEAD_RADIUS,fishAngle + 90);PointF topRightPoint = calculatePoint(headPoint,HEAD_RADIUS,fishAngle - 90);PointF bottomLeftPoint = calculatePoint(bodyBottomCenterPoint,BIG_CIRCLE_RADIUS,fishAngle + 90);PointF bottomRightPoint = calculatePoint(bodyBottomCenterPoint,BIG_CIRCLE_RADIUS,fishAngle - 90);// 二阶贝塞尔曲线的控制点，决定鱼的胖瘦PointF controlLeft = calculatePoint(headPoint,BODY_LENGTH * 0.56f,fishAngle + 130);PointF controlRight = calculatePoint(headPoint,BODY_LENGTH * 0.56f,fishAngle - 130);//画身体mPath.reset();mPath.moveTo(topLeftPoint.x,topLeftPoint.y);mPath.quadTo(controlLeft.x,controlLeft.y,bottomLeftPoint.x,bottomLeftPoint.y);mPath.lineTo(bottomRightPoint.x,bottomRightPoint.y);mPath.quadTo(controlRight.x,controlRight.y,topRightPoint.x,topRightPoint.y);mPaint.setAlpha(BODY_ALPHA);canvas.drawPath(mPath,mPaint);}//计算公式  传入起始点坐标，给出两点之间的长度，两点连线和x坐标的夹角，求出点的坐标public static PointF calculatePoint(PointF startPoint,float length,float angle){float deltaX = (float) (Math.cos(Math.toRadians(angle)) * length);float deltaY = (float) (Math.sin(Math.toRadians(angle - 180)) * length);return new PointF(startPoint.x + deltaX,startPoint.y + deltaY);}//设置透明度@Overridepublic void setAlpha(int alpha) {mPaint.setAlpha(alpha);}//设置颜色过滤器@Overridepublic void setColorFilter(@Nullable ColorFilter colorFilter) {mPaint.setColorFilter(colorFilter);}//设置alpha值@Overridepublic int getOpacity() {return PixelFormat.TRANSLUCENT;}//宽@Overridepublic int getIntrinsicWidth() {return (int) (8.38f * HEAD_RADIUS);}//高@Overridepublic int getIntrinsicHeight() {return (int) (8.38f * HEAD_RADIUS);}
}

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自定义View——游动锦鲤实践

目录

自定义View——游动锦鲤实践

布局文件

使用布局——MainAvtivity

主要实现——FishDrawable

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