Android营造雪花和雨滴浪漫效果
作者:mmsx 时间:2022-11-14 22:47:40
本文在实现雪花效果的基础上,根据漫天飞舞雪花,实现下雨天场景的效果,使用eclipse android 版本,具体内容如下
雪花效果图:
具体代码:
1、漫天飞舞的雪花主要代码
SnowView
<span style="font-size:14px;">package com.ex</span>ample.snowflake.view;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
/**
* 雪花视图, DELAY时间重绘, 绘制NUM_SNOWFLAKES个雪花
*/
public class SnowView extends View {
private static final int NUM_SNOWFLAKES = 150; // 雪花数量
private static final int DELAY = 5; // 延迟
private SnowFlake[] mSnowFlakes; // 雪花
public SnowView(Context context) {
super(context);
}
public SnowView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public SnowView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
if (w != oldw || h != oldh) {
initSnow(w, h);
}
}
private void initSnow(int width, int height) {
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); // 抗锯齿
paint.setColor(Color.WHITE); // 白色雪花
paint.setStyle(Paint.Style.FILL); // 填充;
mSnowFlakes = new SnowFlake[NUM_SNOWFLAKES];
//mSnowFlakes所有的雪花都生成放到这里面
for (int i = 0; i < NUM_SNOWFLAKES; ++i) {
mSnowFlakes[i] = SnowFlake.create(width, height, paint);
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//for返回SnowFlake
for (SnowFlake s : mSnowFlakes) {
//然后进行绘制
s.draw(canvas);
}
// 隔一段时间重绘一次, 动画效果
getHandler().postDelayed(runnable, DELAY);
}
// 重绘线程
private Runnable runnable = new Runnable() {
@Override
public void run() {
//自动刷新
invalidate();
}
};
}
SnowFlake
package com.example.snowflake.view;
import com.example.snowflake.RandomGenerator;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
/**
* 雪花的类, 移动, 移出屏幕会重新设置位置.
*/
public class SnowFlake {
// 雪花的角度
private static final float ANGE_RANGE = 0.1f; // 角度范围
private static final float HALF_ANGLE_RANGE = ANGE_RANGE / 2f; // 一般的角度
private static final float HALF_PI = (float) Math.PI / 2f; // 半PI
private static final float ANGLE_SEED = 25f; // 角度随机种子
private static final float ANGLE_DIVISOR = 10000f;
// 雪花的移动速度
private static final float INCREMENT_LOWER = 2f;
private static final float INCREMENT_UPPER = 4f;
// 雪花的大小
private static final float FLAKE_SIZE_LOWER = 7f;
private static final float FLAKE_SIZE_UPPER = 20f;
private final RandomGenerator mRandom; // 随机控制器
private final Point mPosition; // 雪花位置
private float mAngle; // 角度
private final float mIncrement; // 雪花的速度
private final float mFlakeSize; // 雪花的大小
private final Paint mPaint; // 画笔
private SnowFlake(RandomGenerator random, Point position, float angle, float increment, float flakeSize, Paint paint) {
mRandom = random;
mPosition = position;
mIncrement = increment;
mFlakeSize = flakeSize;
mPaint = paint;
mAngle = angle;
}
public static SnowFlake create(int width, int height, Paint paint) {
RandomGenerator random = new RandomGenerator();
int x = random.getRandom(width);
int y = random.getRandom(height);
Point position = new Point(x, y);
float angle = random.getRandom(ANGLE_SEED) / ANGLE_SEED * ANGE_RANGE + HALF_PI - HALF_ANGLE_RANGE;
float increment = random.getRandom(INCREMENT_LOWER, INCREMENT_UPPER);
float flakeSize = random.getRandom(FLAKE_SIZE_LOWER, FLAKE_SIZE_UPPER);
return new SnowFlake(random, position, angle, increment, flakeSize, paint);
}
// 绘制雪花
public void draw(Canvas canvas) {
int width = canvas.getWidth();
int height = canvas.getHeight();
move(width, height);
canvas.drawCircle(mPosition.x, mPosition.y, mFlakeSize, mPaint);
}
// 移动雪花
private void move(int width, int height) {
//x水平方向,那么需要晃动,主要设置这个值就可以,现在取消晃动了
//如果 mPosition.x不加上后面那个值,就不会晃动了
double x = mPosition.x + (mIncrement * Math.cos(mAngle));
//y是竖直方向,就是下落
double y = mPosition.y + (mIncrement * Math.sin(mAngle));
mAngle += mRandom.getRandom(-ANGLE_SEED, ANGLE_SEED) / ANGLE_DIVISOR;
//这个是设置雪花位置,如果在很短时间内刷新一次,就是连起来的动画效果
mPosition.set((int) x, (int) y);
// 移除屏幕, 重新开始
if (!isInside(width, height)) {
// 重置雪花
reset(width);
}
}
// 判断是否在其中
private boolean isInside(int width, int height) {
int x = mPosition.x;
int y = mPosition.y;
return x > mFlakeSize -5 && x + mFlakeSize <= width && y >= -mFlakeSize - 1 && y - mFlakeSize < height;
}
// 重置雪花
private void reset(int width) {
mPosition.x = mRandom.getRandom(width);
mPosition.y = (int) (-mFlakeSize - 1); // 最上面
mAngle = mRandom.getRandom(ANGLE_SEED) / ANGLE_SEED * ANGE_RANGE + HALF_PI - HALF_ANGLE_RANGE;
}
}
2、实现下雨天效果代码
RainView
package com.example.raindrop.view;
import com.example.raindrop.R;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
/**
* 雨滴视图, DELAY时间重绘, 绘制NUM_SNOWFLAKES个雨滴
*/
public class RainView extends View {
private static final int NUM_SNOWFLAKES = 150; // 雨滴数量
private static final int DELAY = 5; // 延迟
private RainFlake[] mSnowFlakes; // 雨滴
public RainView(Context context) {
super(context);
}
public RainView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public RainView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
if (w != oldw || h != oldh) {
initSnow(w, h);
}
}
private void initSnow(int width, int height) {
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); // 抗锯齿
paint.setColor(getResources().getColor(R.color.colorWater)); // 雨滴的颜色
paint.setStyle(Paint.Style.FILL); // 填充;
mSnowFlakes = new RainFlake[NUM_SNOWFLAKES];
//mSnowFlakes所有的雨滴都生成放到这里面
for (int i = 0; i < NUM_SNOWFLAKES; ++i) {
mSnowFlakes[i] = RainFlake.create(width, height, paint);
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//for返回SnowFlake
for (RainFlake s : mSnowFlakes) {
//然后进行绘制
s.draw(canvas);
}
// 隔一段时间重绘一次, 动画效果
getHandler().postDelayed(runnable, DELAY);
}
// 重绘线程
private Runnable runnable = new Runnable() {
@Override
public void run() {
//自动刷新
invalidate();
}
};
}
RainFlake
package com.example.raindrop.view;
import com.example.raindrop.RandomGenerator;
import android.graphics.Canvas;
import android.graphics.Paint;
/**
* 雨滴的类, 移动, 移出屏幕会重新设置位置.
*/
public class RainFlake {
// 雨滴的移动速度
private static final float INCREMENT_LOWER = 6f;
private static final float INCREMENT_UPPER = 8f;
// 雨滴的大小
private static final float FLAKE_SIZE_LOWER = 2f;
private static final float FLAKE_SIZE_UPPER = 5f;
private final float mIncrement; // 雨滴的速度
private final float mFlakeSize; // 雨滴的大小
private final Paint mPaint; // 画笔
private Line mLine; // 雨滴
private RandomGenerator mRandom;
private RainFlake(RandomGenerator random,Line line, float increment, float flakeSize, Paint paint) {
mRandom = random;
mLine = line;
mIncrement = increment;
mFlakeSize = flakeSize;
mPaint = paint;
}
//生成雨滴
public static RainFlake create(int width, int height, Paint paint) {
RandomGenerator random = new RandomGenerator();
int [] nline;
nline = random.getLine(width, height);
Line line = new Line(nline[0], nline[1], nline[2], nline[3]);
float increment = random.getRandom(INCREMENT_LOWER, INCREMENT_UPPER);
float flakeSize = random.getRandom(FLAKE_SIZE_LOWER, FLAKE_SIZE_UPPER);
return new RainFlake(random,line, increment, flakeSize, paint);
}
// 绘制雨滴
public void draw(Canvas canvas) {
int width = canvas.getWidth();
int height = canvas.getHeight();
drawLine(canvas, width, height);
}
/**
* 改成线条,类似于雨滴效果
* @param canvas
* @param width
* @param height
*/
private void drawLine(Canvas canvas, int width, int height) {
//设置线宽
mPaint.setStrokeWidth(mFlakeSize);
//y是竖直方向,就是下落
double y1 = mLine.y1 + (mIncrement * Math.sin(1.5));
double y2 = mLine.y2 + (mIncrement * Math.sin(1.5));
//这个是设置雨滴位置,如果在很短时间内刷新一次,就是连起来的动画效果
mLine.set(mLine.x1,(int) y1,mLine.x2 ,(int) y2);
if (!isInsideLine(height)) {
resetLine(width,height);
}
canvas.drawLine(mLine.x1, mLine.y1, mLine.x2, mLine.y2, mPaint);
}
// 判断是否在其中
private boolean isInsideLine(int height) {
return mLine.y1 < height && mLine.y2 < height;
}
// 重置雨滴
private void resetLine(int width, int height) {
int [] nline;
nline = mRandom.getLine(width, height);
mLine.x1 = nline[0];
mLine.y1 = nline[1];
mLine.x2 = nline[2];
mLine.y2 = nline[3];
}
}
雨滴效果图:
标签:Android,雪花,雨滴
![](/images/zang.png)
![](/images/jiucuo.png)
猜你喜欢
Qt QTableWidget基本操作及使用
2022-05-22 23:15:55
![](https://img.aspxhome.com/file/2023/5/117775_0s.gif)
Java字符流和字节流对文件操作的区别
2022-06-08 10:32:01
![](https://img.aspxhome.com/file/2023/3/113413_0s.png)
feignclient https 接口调用报证书错误的解决方案
2021-08-20 18:35:55
![](https://img.aspxhome.com/file/2023/8/66518_0s.jpg)
Java Integer及int装箱拆箱对比
2023-04-22 04:21:11
Java使用DFA算法实现敏感词过滤的示例代码
2022-10-21 00:56:13
![](https://img.aspxhome.com/file/2023/8/77138_0s.png)
Java基础-Java的体系结构
2022-05-18 00:19:05
![](https://img.aspxhome.com/file/2023/1/63501_0s.png)
mybatis sum(参数) 列名作为参数的问题
2022-06-16 01:45:44
Android动态加载布局实现技巧介绍
2022-03-06 13:31:48
![](https://img.aspxhome.com/file/2023/2/137662_0s.png)
Java中Runnable与Callable接口的区别详解
2021-12-22 11:33:28
Android实现探探图片滑动效果
2022-11-14 17:09:19
![](https://img.aspxhome.com/file/2023/0/138990_0s.jpg)
C# 正则表达式进阶
2022-12-26 01:56:32
浅谈Java基准性能测试之JMH
2023-01-25 13:17:40
Android实现左滑删除控件
2023-03-02 21:36:49
![](https://img.aspxhome.com/file/2023/6/106826_0s.gif)
详解JAVA高质量代码之数组与集合
2022-03-31 16:42:07
C#中神器类BlockingCollection的实现详解
2022-10-13 07:41:02
基于java实现斗地主代码实例解析
2023-09-07 00:31:15
![](https://img.aspxhome.com/file/2023/4/100664_0s.png)
Java定时器问题实例解析
2021-08-21 21:02:53
Android车载多媒体开发MediaSession框架示例详解
2022-08-10 19:49:20
![](https://img.aspxhome.com/file/2023/1/116161_0s.jpg)
c# 实现轮询算法实例代码
2023-01-30 03:48:51
Java环境变量的设置方法(图文教程)
2023-01-02 17:51:42
![](https://img.aspxhome.com/file/2023/4/102134_0s.jpg)