Android绘制波浪曲线，效果很赞的。
16lz
2022-01-21
github地址：https://github.com/sddyljsx/Android-SurfView-WaveViewpackage neal.canvas;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.graphics.RectF;import android.util.AttributeSet;import android.view.View;/** * Created by songxun.sx on 2015/8/14. */public class MyView extends View { NextFrameAction nextFrameAction; RectF rectF; Paint paint; Paint paint2; Paint paint3; Path path; Path path1; int width; int height; int w = 0; double startTime; int waveAmplitude; int waveRange; int highLevel; public MyView(Context context) { super(context); } public MyView(Context context, AttributeSet attrs) { super(context, attrs); } public MyView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } private void init() { nextFrameAction = new NextFrameAction(); width = getMeasuredWidth(); height = getMeasuredHeight(); waveRange = width; rectF = new RectF(5, 5, width - 5, height - 5); paint = new Paint(); paint2 = new Paint(); paint3=new Paint(); paint.setAntiAlias(true); paint.setColor(Color.RED); paint3.setAntiAlias(true); paint3.setColor(0x99ff0000); paint2.setAntiAlias(true); paint2.setStyle(Paint.Style.STROKE); paint2.setStrokeWidth(5); paint2.setColor(Color.RED); path = new Path(); path1 = new Path(); startTime = System.currentTimeMillis(); waveAmplitude = 20; highLevel = (int) (height * (0.5) + waveAmplitude); } protected class NextFrameAction implements Runnable { @Override public void run() { path.reset(); path1.reset(); path.addArc(rectF, 90.0f - 145.0f / 2.0f, 145.0f); path1.addArc(rectF, 90.0f - 145.0f / 2.0f, 145.0f); w += 5; if (w >= (width - 5) * 2) { w = 0; } for (int i = 5; i < width - 5; i++) { path.lineTo(i, (float) (highLevel + waveAmplitude * Math.cos((float) (i + w) / (float) (width - 5) * Math.PI))); path1.lineTo(i, (float) (highLevel - waveAmplitude * Math.cos((float) (i + w) / (float) (width - 5) * Math.PI))); } path.close(); path1.close(); invalidate(); } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); init(); } @Override protected void onDraw(Canvas canvas) { canvas.drawCircle(width / 2, height / 2, width / 2 - 5, paint2); //canvas.drawArc(rectF,90.0f-145.0f/2.0f,145.0f,false,paint); canvas.drawPath(path, paint); canvas.drawPath(path1,paint3); postDelayed(nextFrameAction, 4); }}surfaceview代码：package neal.canvas;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.graphics.PixelFormat;import android.graphics.RectF;import android.util.AttributeSet;import android.view.SurfaceHolder;import android.view.SurfaceView;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.ScheduledThreadPoolExecutor;import java.util.concurrent.TimeUnit;/** * Created by songxun.sx on 2015/8/17. */public class MyView2 extends SurfaceView implements SurfaceHolder.Callback { SurfaceHolder surfaceHolder; NextFrameAction nextFrameAction; RectF rectF; Paint paint; Paint paint2; Paint paint3; Path path; Path path1; int width; int height; int w = 0; double startTime; int waveAmplitude; int waveRange; int highLevel; Canvas canvas; public MyView2(Context context) { super(context); } public MyView2(Context context, AttributeSet attrs) { super(context, attrs); } public MyView2(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } private void init() { nextFrameAction = new NextFrameAction(); width = getMeasuredWidth(); height = getMeasuredHeight(); waveRange = width; rectF = new RectF(5, 5, width - 5, height - 5); paint = new Paint(); paint2 = new Paint(); paint3 = new Paint(); paint.setAntiAlias(true); paint.setColor(Color.RED); paint3.setAntiAlias(true); paint3.setColor(0x99ff0000); paint2.setAntiAlias(true); paint2.setStyle(Paint.Style.STROKE); paint2.setStrokeWidth(5); paint2.setColor(Color.RED); path = new Path(); path1 = new Path(); startTime = System.currentTimeMillis(); waveAmplitude = 20; highLevel = (int) (height * (0.5) + waveAmplitude); surfaceHolder = this.getHolder(); //为SurfaceHolder添加一个回调函数 surfaceHolder.addCallback(this); setZOrderOnTop(true);//设置画布 背景透明 surfaceHolder.setFormat(PixelFormat.TRANSLUCENT); } protected class NextFrameAction implements Runnable { @Override public void run() { path.reset(); path1.reset(); path.addArc(rectF, 90.0f - 145.0f / 2.0f, 145.0f); path1.addArc(rectF, 90.0f - 145.0f / 2.0f, 145.0f); w += 5; if (w >= (width - 5) * 2) { w = 0; } for (int i = 5; i < width - 5; i++) { path.lineTo(i, (float) (highLevel + waveAmplitude * Math.cos((float) (i + w) / (float) (width - 5) * Math.PI))); path1.lineTo(i, (float) (highLevel - waveAmplitude * Math.cos((float) (i + w) / (float) (width - 5) * Math.PI))); } path.close(); path1.close(); Draw(); } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); init(); } protected void Draw() { canvas = surfaceHolder.lockCanvas(); canvas.drawColor(Color.WHITE); canvas.drawCircle(width / 2, height / 2, width / 2 - 5, paint2); canvas.drawArc(rectF,90.0f-145.0f/2.0f,145.0f,false,paint); canvas.drawPath(path, paint); canvas.drawPath(path1, paint3); surfaceHolder.unlockCanvasAndPost(canvas); } @Override public void surfaceCreated(SurfaceHolder holder) { ScheduledExecutorService executorService= new ScheduledThreadPoolExecutor(1); NextFrameAction nextFrameAction=new NextFrameAction(); executorService.scheduleAtFixedRate(nextFrameAction, 4, 4, TimeUnit.MILLISECONDS); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceDestroyed(SurfaceHolder holder) { }}更多相关文章
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