Java Small case (planetary movement)

Java Small Case

Planetary Movement: Reference: 300 episodes

Using the software: Idea2017,java

1, Photo gallery: Here (idea image source placed in the target directory, to access to), it is recommended to look up from small ...

2, define MyFrame

 Packagemy.university;Importjava.awt.*;ImportJava.awt.event.WindowAdapter;Importjava.awt.event.WindowEvent; Public classMyFrameextendsFrame { Public voidLaunchfram () {setSize (Content.game_with,content.game_high); SetLocation (100,100); SetVisible (true); NewPaintthread (). Start (); Addwindowlistener (NewWindowadapter () {@Override Public voidwindowclosing (windowevent e) {system.exit (0);    }        }); }   Private classPaintthreadextendsthread{ Public voidrun () { while(true) {repaint (); Try{Thread.Sleep (50); } Catch(interruptedexception e) {e.printstacktrace (); }            }        }   }}

2, define the Imageutil class:

 Packagemy.university;ImportJavax.imageio.ImageIO;Importjava.awt.*;ImportJava.awt.image.BufferedImage;Importjava.io.IOException;ImportJava.net.URL; Public classImageutil {PrivateImageutil () {}//does the tool class constitute a private,?     Public StaticImage getImage (String path) {URL URL=imageutil.class. getresource (path); /*System.out.println (ImageUtil.class.getClassLoader (). GetResource ("")); Result is file:/d:/xxxxx/sparkdemo/sparksql/target/classes/*/bufferedimage Image=NULL; Try{image=imageio.read (URL); } Catch(IOException e) {e.printstacktrace (); }        returnimage; }}

3, define the constant class, equivalent to the configuration file

 Package my.university;  Public class Content {    publicstaticfinalint game_with=500;      Public Static Final int game_high=500;}

4, defining the Start class

 Packagemy.university;Importjava.awt.*; Public classStart { Public Doublex;  Public Doubley;  Public DoubleWith ;  Public Doubleheight;    Image Image;  PublicStart () {}//default constructs, for subclass inheritance     PublicStart (image image) { This. image=image;  This. With=image.getwidth (NULL);  This. Height=image.getheight (NULL); }     PublicStart (image Image,DoubleXDoubley) {         This(image);  This. x=x;  This. y=y; }     PublicStart (String Path,DoubleXDoubley) {         This(Imageutil.getimage (path), x, y); }     Public voidDraw (Graphics g) {g.drawimage (image, (int) x, (int) Y,NULL); }}

5, defining the plant class

 Packagemy.university;Importjava.awt.*;/*** Created by Administrator on 2017/8/12.*/ Public classPlantextendsStart {DoubleLongaxis;//The long axis of an ellipse    DoubleShortaxis;//the short axis of an ellipse    DoubleSpeed//Speed of Flight    Doubledegree;    Start Center; BooleanStatellite;  PublicPlant () {} PublicPlant (Start center,string Path,DoubleLongaxis,DoubleShortaxis,DoubleSpeed ) {        Super(Imageutil.getimage (path));  This. center=Center;  This. x=center.x+Longaxis;  This. y=Center.y;  This. longaxis=Longaxis;  This. shortaxis=Shortaxis;  This. speed=Speed ;; }     PublicPlant (Start center,string Path,DoubleLongaxis,DoubleShortaxis,DoubleSpeed,boolean Statellite) {        This(center, Path, Longaxis, Shortaxis, speed);  This. statellite=Statellite; }     PublicPlant (image image) {Super(image); }     PublicPlant (image Image,DoubleXDoubley) {        Super(image, X, y); }    //Draw Track     Public voidDrawtrace (Graphics g) {DoubleOvalx,ovaly,ovalwidth,ovalheight; Ovalwidth= Longaxis*2; Ovalheight= Shortaxis*2; Ovalx= (CENTER.X+CENTER.WITH/2)-Longaxis; Ovaly= (CENTER.Y+CENTER.HEIGHT/2)-Shortaxis; Color C=G.getcolor (); G.setcolor (Color.Blue);
G.drawoval ((int) Ovalx, (int) Ovaly, (int) Ovalwidth, (intovalheight);//define the upper-left coordinate of the rectangle and the width and height, and draw an ellipse in the rectangle G.setcolor (c); }    //Moving     Public voidMove () {x=center.x+center.with/2+longaxis*Math.Cos (degree); Y=center.y+center.height/2+shortaxis*Math.sin (degree); Degree+=Speed ; }     Public voidDraw (Graphics g) {Super. Draw (g);        Move (); if(!statellite)        {Drawtrace (g); }    }}

6, set to invoke class

 Packagemy.university;Importjava.awt.*; Public classSolarframeextendsmyframe {Image bg=imageutil.getimage ("Images/bg.jpg"); Start Sun=NewStart ("Images/sun.jpg", CONTENT.GAME_WITH/2,CONTENT.GAME_HIGH/2); Plant Mercurys=NewPlant (Sun, "images/mercury.jpg", 50, 30, 0.2); Plant Venus=NewPlant (Sun, "images/venus.jpg", 60, 40, 0.3); Plant Earth=NewPlant (Sun, "images/earth.jpg", 100,50,0.4); Plant Mars=NewPlant (Sun, "images/mars.jpg", 120, 60, 0.5); Plant Jupiter=NewPlant (Sun, "images/jupiter.jpg", 140, 70, 0.6); Plant Saturn=NewPlant (Earth, "images/saturn.jpg", 160,80,0.7,true); Plant Uranus=NewPlant (Sun, "images/uranus.jpg", 180, 90, 0.8); Plant Neptune=NewPlant (Sun, "images/neptune.jpg", 200, 100, 0.9); Plant Moon=NewPlant (Earth, "images/moon.jpg", 30, 20, 0.3,true);  Public voidPaint (Graphics g) {g.drawimage (bg,0,0,NULL);        Sun.draw (g);        Mercurys.draw (g);        Venus.draw (g);        Earth.draw (g);        Mars.draw (g);        Jupiter.draw (g);        Saturn.draw (g);        Uranus.draw (g);        Neptune.draw (g);    Moon.draw (g); }     Public Static voidMain (string[] args) {Newsolarframe (). Launchfram (); }}

Finally, attach the code

Java Small case (planetary movement)