Android Effects--rain of particle effects

Last Update:2015-09-02 Source: Internet

Author: User

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1. Behavior of individual Raindrops2. Improve the behavior of raindrops and tectonic rain scenes3. Define properties in XML that can control rain------------------------------------------------------1. Behavior of a single Raindrop: a line segment in motionStarting point: startX, starty;Termination point: stopx, stopy;Frame Class for Custom view<pre> public Abstract classBaseviewextendsView {thread thread; publicbaseview (context context, attributeset attrs) {Super(context, attrs); } publicBaseview (context Context) {Super(context); } @OverrideFinal protected voidOnDraw (canvas Canvas) {//prohibit subclass overrides, use final if(thread = =NULL) {thread=NewMyThread (); Thread.Start (); } Else{drawsub (canvas); } } protected Abstract voidLogic (); protected Abstract voiddrawsub (canvas canvas); @OverrideFinal protected voidOndetachedfromwindow () {//end when leaving the screen//Ondetachedfromwindow is called after destroying the resource (both destroying the View)running =false; Super. Ondetachedfromwindow (); } Private Booleanrunning =true; classMyThreadextendsThread {@Override public voidRun () { while(running) {logic (); Postinvalidate (); //the thread updates the drawing and calls the OnDraw method again Try{thread.sleep (50);//It's too fast for the naked eye to see, to Sleep.}Catch(interruptedexception E) {//TODO auto-generated Catch blockE.printstacktrace (); } } } }}</pre>customizing individual Raindrop Rainview<pre> public classRainviewextendsBaseview {Private floatStartX = 0; Private floatStarty = 0;//Start point Private floatSTOPX = 0; Private floatStopy = 0;//Stop point Private floatSizex = 0; Private floatSizey = 0; PrivatePaint paint; publicRainview (context Context) {Super(context); //TODO auto-generated Constructor stub } publicrainview (context context, attributeset attrs) {Super(context, attrs); Sizex= 10; Sizey= 30; //the shape of a single raindrop, represented by a line segmentStartX = 100; Starty= 0; STOPX= StartX +sizex; Stopy= Starty +sizey; Paint=NewPaint (); Paint.setcolor (0xFFFFFFFF); } @Overrideprotected voidlogic () {//Let the rain move floatopt = 0.3f; StartX+ = Sizex *opt; STOPX+ = Sizex *opt; Starty+ = Sizey *opt; Stopy+ = Sizey *opt; //when the rain drops out of the screen, let it go back to the starting point if(starty > GetHeight () | | StartX >getwidth ()) {startX= 100; Starty= 0; STOPX= StartX +sizex; Stopy= Starty +sizey; }} @Overrideprotected voiddrawsub (canvas Canvas) {//Drawsub completing the drawing operationcanvas.drawline (startX, starty, stopx, stopy, paint); }}</pre>Using in the layout file<pre><Framelayoutxmlns:android= "http://schemas.android.com/apk/res/android"Xmlns:tools= "http://schemas.android.com/tools"Android:id= "@+id/container"Android:layout_width= "match_parent"Android:layout_height= "match_parent"Tools:context= "com.carloz.raineffect.MainActivity" > < Com.carloz.raineffect.v1.single_rain. RainvieWAndroid:layout_width= "match_parent"Android:layout_height= "match_parent"Android:background= "#ff000000" /></Framelayout></pre>The effect is as Follows:2. Improve the behavior of raindrops and tectonic rain scenes2.1 Abstract The Raindrop effect and behavior* The speed and length of raindrops is variable* The tilt angle of the raindrops is Variable.* The position of raindrops is Variable.<pre> public classRainitem {Private intwidth; Private intheight; publicRainitem (intWidthintHeight) { this. width =width; this. Height =height; Init (); } Private floatStartX = 0; Private floatStarty = 0;//Start point Private floatSTOPX = 0; Private floatStopy = 0;//Stop point Private floatSizex = 0; Private floatSizey = 0; PrivatePaint paint; Private floatopt; PrivateRandom random; public voidInit () {//TODO auto-generated Method StubRandom =NewRandom (); Sizex= 1 + random.nextint (10);//randomly changing the angle of the raindropsSizey = 1 + random.nextint (20); //the shape of a single raindrop, represented by a line segmentStartX = Random.nextint ( this. width); Starty= Random.nextint ( this. height);//randomly changing the position of raindropsSTOPX = StartX +sizex; Stopy= Starty +sizey; Paint=NewPaint (); Paint.setcolor (0xFFFFFFFF); } public voidDraw (canvas Canvas) {canvas.drawline (startX, starty, stopx, stopy, paint); } public voidmove () {//Let the rain moveopt = 0.2f + random.nextfloat ();//randomly changing the speed and length of raindropsStartX + = Sizex *opt; STOPX+ = Sizex *opt; Starty+ = Sizey *opt; Stopy+ = Sizey *opt; //when the rain drops out of the screen, let it go back to the starting point if(starty > this. Height | | StartX > this. Width) {startX= Random.nextint ( this. width); Starty= Random.nextint ( this. height); STOPX= StartX +sizex; Stopy= Starty +sizey; } }}</pre>2.2 Defining multiple RaindropsIn the Add abstract Baseview method: protected abstract void init ();<pre>classMyThreadextendsThread {@Override public voidrun () { init (); while(running) {logic (); Postinvalidate (); //the thread updates the drawing and calls the OnDraw method again Try{thread.sleep (50);//It's too fast for the naked eye to see, to Sleep.}Catch(interruptedexception E) {//TODO auto-generated Catch blockE.printstacktrace (); } } }}</pre><pre> public classRainviewextendsBaseview {ArrayList<RainItem> rainlist =NewArraylist<rainitem>(); intSize = 80; publicRainview (context Context) {Super(context); } publicrainview (context context, attributeset attrs) {Super(context, attrs); } @Overrideprotected voidInit () {//TODO auto-generated Method Stub for(inti = 0; I < size; i++) {rainitem Item=Newrainitem (getwidth (), getheight ()); Rainlist.add (item); }} @Overrideprotected voidlogic () { for(rainitem Item:rainlist) {item.move (); }} @Overrideprotected voiddrawsub (canvas Canvas) {//Drawsub completing the drawing operation for(rainitem Item:rainlist) {item.draw (canvas); } }}</pre>The effect is as Follows:3. Define properties in XML that can control rainAndroid Effects--rain of particle effects

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