Java Movingball (Collation)

1  Packagedemo;2 3 /**4 * Java Movingball (collation)5 * Disclaimer:6 * This source code does not have the comment, has forgotten why to write him, basically should be because at that time thought the fun. 7 * Sometimes think about it, maybe because that's what you want to do with that effect. 8  *9 * 2016-1-2 Shenzhen Nanshan Ping Shan village ZengjianfengTen  */ One  A ImportJava.awt.Color; - ImportJava.awt.Graphics; -  the ImportJavax.swing.JFrame; - ImportJavax.swing.JPanel; -  -  Public classMovingballextendsJPanel { +  -     Private Static Final LongSerialversionuid = 1L; +     Static intCenterX = 600/2; A     Static intCenterY = 600/2; at     FinalBall Ball =NewBall (CenterX, centery); -     BooleanCicleflag =true; -     intCiclesemi = 0; -     DoubleAngle = 0; -     intBallcicle = 30; -      PublicMovingball () { in start (); -     } to @Override +      Public voidPaint (Graphics graphics) { -         Super. Paint (graphics); the          This. SetBackground (color.black); * Graphics.setcolor (color.blue); $Graphics.fillarc (CENTERX-CICLESEMI/2, CENTERY-CICLESEMI/2, Ciclesemi, Ciclesemi, 0, 360);Panax Notoginseng ball.drawing (graphics); - Graphics.setcolor (color.white); theGraphics.drawarc (CENTERX-CICLESEMI/2, CENTERY-CICLESEMI/2, Ciclesemi, Ciclesemi, 0, 360); +Graphics.fillarc ((int) (Centerx+ciclesemi/2*math.cos (angle*math.pi/180)-BALLCICLE/2), (int) (Centery+ciclesemi/2*math.sin (angle*math.pi/180)-ballcicle/2), ballcicle, ballcicle, 0, 360); AGraphics.fillarc ((int) (Centerx+ciclesemi/2*math.cos ((angle+180) *math.pi/180)-BALLCICLE/2), (int) (Centery+ciclesemi/2*math.sin ((angle+180) *math.pi/180)-ballcicle/2), ballcicle, ballcicle, 0, 360); the     } +      Public voidstart () { -         NewThread (NewRunnable () { $              $ @Override -              Public voidrun () { -                  while(true) { the                     Try { - ballmove (ball);Wuyi                          the                         if(Cicleflag = =true) { -Ciclesemi + = 2; Wu                             if(Ciclesemi >CenterX) { -Cicleflag =false; About                             } $}Else { -Ciclesemi-= 2; -                             if(Ciclesemi < 0) { -Cicleflag =true; A                             } +                         } theAngle + +; - repaint (); $Thread.Sleep (20); the}Catch(interruptedexception e) { the e.printstacktrace (); the                     } the                 } -                  in             } the  the              Public voidballmove (Ball ball) { AboutBall.x + =Ball.dx; theBall.y + =Ball.dy; the                 if(Ball.x < | | ball.x > CENTERX*2-50) { theBALL.DX =-Ball.dx; +}Else if(Ball.y < | | ball.y > CENTERY*2-50) { -Ball.dy =-Ball.dy; the                 }Bayi             } the }). Start (); the     }  -      -      Public Static voidMain (string[] args) { theJFrame JFrame =NewJFrame (); theJframe.settitle ("Movingball"); theJframe.setsize (centerx*2, centery*2); the jframe.setdefaultcloseoperation (jframe.exit_on_close); -Jframe.setlocationrelativeto (NULL); the          theMovingball Moveball =NewMovingball (); the Jframe.add (moveball);94Jframe.setvisible (true); the     } the } the 98 classball{ About     Static intStep = 10; -     intx;101     inty;102     intDX;103     intdy;104     Doubleangle; the     intCicle = 30;106      PublicBall (intXinty) {107          This. x =x;108          This. y =y;109          This. Angle = Math.random () *360; the         if(Angle <= 180) {111DX = (int) (Step*math.cos (angle*math.pi/180)); theDY = (int) (Step*math.sin (angle*math.pi/180));113}Else { theDX = (int) (Step*math.cos (angle*math.pi/180)); theDY =-(int) (Step*math.sin (angle*math.pi/180)); the         }117     }118      PublicBall (intXintYintangle) {119          This. x =x; -          This. y =y;121          This. Angle =angle;122         if(Angle <= 180) {123DX = (int) (Step*math.cos (angle*math.pi/180));124DY = (int) (Step*math.sin (angle*math.pi/180)); the}Else {126DX = (int) (Step*math.cos (angle*math.pi/180));127DY =-(int) (Step*math.sin (angle*math.pi/180)); -         };129     } the      Public voidDrawing (Graphics graphics) {131 Graphics.setcolor (color.white); theGraphics.fillarc ( This. X-CICLE/2, This. Y-CICLE/2, Cicle, cicle, 0, 360);133     }134}

Effect

Java Movingball (grooming)