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
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<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
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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
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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
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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：
以上就是本文的全部内容，帮助大家轻松实现浪漫的雪花雨滴效果，大家可以把效果运用到自己的项目中，希望大家喜欢。
