colors - Java Bouncing ball app with random colour -


i have been handed task of making ball bounce in program have created. trying focus on more advanced features, second ball (which have done successfully) , making ball change random colour each time bounces.

i quite new java, , coding in general, have managed make both both change random colour first time hit wall. however, cannot seem make change different colour each time bounces. have suggestions how accomplish this?

import java.awt.color; import java.awt.graphics; import java.util.random;   public class mainclass extends javax.swing.jframe implements runnable { int width ; int height ; int ball; int ball2; int posx; int posy; int posx2; int posy2; int dx = 8; int dy = 8;//dx dy varuiables movement of ball int dx2 = -8; int dy2 = -8; random rand = new random(); float r = rand.nextfloat(); float g = rand.nextfloat(); float b = rand.nextfloat(); float r2 = rand.nextfloat(); float g2 = rand.nextfloat(); float b2 = rand.nextfloat(); color randomcolor = new color(r, g, b); color randomcolor2 = new color(r2,g2,b2); color c1 = color.blue; color c2 = color.green; thread move = new thread (this);   public void paint(graphics g) {     g.setcolor(color.black);     g.fillrect(0,0,width,height);     g.setcolor(c1);     g.filloval(posx ,posy ,ball,ball);      g.setcolor(c2);     g.filloval(posx2,posy2, ball2,ball2);      // sets starting position of oval(ball)   }    public void run(){   try {         while (true){           posx=posx+dx;           posy=posy+dy;           posx2=posx2+dx2;           posy2=posy2+dy2;           //this speed of ball           repaint();            move.sleep(100);             //this shows ball on screen                 if (posy > height - ball)                 {                     dy = dy *-1;                     c1 = randomcolor;                   }                 if ( posy <0 - ball)                 {                     dy = dy *-1;                     c1 = randomcolor;                   }                 if(posx > width - ball)                 {                     c1 = randomcolor;                     dx = dx*-1;                  }                 if(posx <0 - ball )                 {                     c1 = randomcolor;                     dx = dx*-1;                  }                 // code first ball                 if(posx > width - ball2 || posx <0 - ball2)                 {                     dx2 = dx2*-1;                     c2 = randomcolor2;                 }                 if(posy > height - ball2 || posy <0 - ball2)                 {                     dy2 = dy2 *-1;                     c2 = randomcolor2;                 }       }     }   catch(exception ex) {       ex.printstacktrace();    } }  public mainclass() {     initcomponents();     this.setresizable(false);     width = getwidth();     height = getheight();     //this code creates program dimensions     posx = width/2;     posy = height/2;     posx2 = width/2;     posy2 = height/2;     ball = 20;     ball2= 20;

change color of randomcolor each time after set next time set different.


Comments

Post a Comment

Popular posts from this blog

php - failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request -

this code i'm using find latitude , longitude of place: function coords($address){ echo $url="http://maps.googleapis.com/maps/api/geocode/json?address=".$address; $json = file_get_contents(urlencode($url)); $data = json_decode($json, true); print_r($data['results'][0]['geometry']['location']['lat']); print_r($data['results'][0]['geometry']['location']['lng']); } however returns warning: failed open stream: http request failed! http/1.0 400 bad request if use above code in simple procedure works fine not in function. note: have tried curl_init()... method produced same result? instead of encoding whole url encode address part. following code work fine $add='jamshoro phase 2'; $url="http://maps.googleapis.com/maps/api/geocode/json?address=".urlencode($add); $json = file_get_contents($url); $data = json_decode($json, true); print_r($data['r
Read more

java - How to filter a backspace keyboard input -

i have code gives message when key number pressed: txtvalueofclause.addeventfilter(keyevent.key_typed, new eventhandler<keyevent>() { @override public void handle(keyevent t) { char ar[] = t.getcharacter().tochararray(); char ch = ar[t.getcharacter().tochararray().length - 1]; if (!(ch >= '0' && ch <= '9')) { system.out.println("the char entered not number"); t.consume(); } } }); now if press on wrong button , press backspace remove it, error message. how can add backspace input if statement? i have found answer: txtvalueofclause.addeventfilter(keyevent.key_typed, new eventhandler<keyevent>() { @override public void handle(keyevent t) { char ar[] = t.getcharacter().tochararray(); char ch = ar[t.getcharacter().tochar
Read more

java - Show Soft Keyboard when EditText Appears -

i have code in android app, alert dialog , keyboard, , when dialog shown want keyboard appear. not , not sure why? here code: final alertdialog.builder alert = new alertdialog.builder(this); alert.settitle("title"); alert.setmessage("message"); final edittext input = new edittext(this); input.setinputtype(inputtype.type_class_number); alert.setview(input); input.setonfocuschangelistener(new view.onfocuschangelistener() { @override public void onfocuschange(view v, boolean hasfocus) { if (hasfocus) { log.i(tag, "in focus"); inputmethodmanager inputmethodmanager = (inputmethodmanager) getsystemservice(context.input_method_service); inputmethodmanager.showsoftinput(input, inputmethodmanager.show_implicit); } } }); but keyboard not appear though edit text in focus, , tell appear why, doesn't come up? thanks in advance.
Read more