Draw a Circle Based on Entered Values Javafx

#one

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Random Circle Generator with user input

Posted 06 Apr 2010 - 12:23 AM

Here is my problem. I am trying to generate a number of circles in random locations and with random sizes in my defined JFrame. This is to be done based on the input (int) from the user. I am using Scanner for the input and not having whatever issues there. The JFrame works and the code compiles and executes fine but only i circle appears. How practice I get the user inputted integer to tell the programme to draw the circles at random locals and with random sizes the number of times the user has entered? I volition post the code of the program below. It is separated into a component and viewer.

Component Lawmaking:

import javax.swing.JComponent; import javax.swing.JPanel; import coffee.awt.Graphics; import java.awt.Graphics2D; import java.util.Random; import java.awt.geom.Ellipse2D; import javax.swing.JFrame; import java.util.Scanner;  /** A CircleComponent draws a number of random circles. */ public class CircleComponent extends JComponent {    /**    Constructs a CircleComponent that draws a given number of circles.    @param n the number of circles to draw.    */    public void CircleComponent(int n)    { 	 	/** 	Constructs a circle n times, based on user input, in random locations with random bore. 	*/	 	    		n = 1; 		Random generator = new Random();	    } 	 	   int n = 1; 		 	   public void paintComponent(Graphics g)       { 	       			//Recover Graphics2D 	   	        Graphics2D g2 = (Graphics2D) g;   		 			 		   //Depict the circle 			Ellipse2D.Double circle = new Ellipse2D.Double(l, 100, 30, sixty); 	                g2.draw(circle);   		      		  		} 		 		 		  		 		 	      	private Random generator; 	private int number; 	 }            

and the Viewer Lawmaking:

import javax.swing.JFrame; import java.util.Scanner; import javax.swing.JLabel;  /**    */ public class CircleViewer {    public static void main(Cord[] args) 	{		 	   Scanner in = new Scanner(Organisation.in); 		   		 		 		 		System.out.println("Enter the number of circles y'all want to see  "); 		Organisation.out.print("(Please enter an integer between i and 20):  "); 		int i = in.nextInt(); 	 		 		 		 		  		JFrame frame2 = new JFrame();       frame2.setSize(800, 800); 	   frame2.setTitle("Circle Viewer"); 		frame2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 		    	CircleComponent component = new CircleComponent (); 		frame2.add together(component); 		 		 	   frame2.setVisible(true);  		 	} 		   	 	  }            

Any help with the random generation dictated by the user input would be great. Additionally, all of the circles must stay completely inside the frame. I am not sure how to fix that either but call back I tin effigy it out after some sleep .

EDIT: Inserted code tags, PennyBoki. Delight in futurity. And try not to utilize large fonts. Thanks.

This mail has been edited by PennyBoki: 06 April 2010 - 01:39 AM
Reason for edit:: code tags and large fonts

Is This A Practiced Question/Topic? 0

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#ii PennyBoki

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Re: Random Circle Generator with user input

Posted 06 Apr 2010 - 02:21 AM

Hello I made corrections in your codes and added comments, please follow the comments and I call back yous'll clear things upwards a little chip.

Component Code:

import javax.swing.JComponent; import javax.swing.JPanel; import coffee.awt.Graphics; import java.awt.Graphics2D; import java.util.Random; import java.awt.geom.Ellipse2D; import javax.swing.JFrame; import coffee.util.Scanner; import java.lang.Math;  /** A CircleComponent draws a number of random circles. */ public class CircleComponent extends JComponent {    /**    Constructs a CircleComponent that draws a given number of circles.    @param due north the number of circles to draw.    */    int hlp;//I need this to pass n to the for loop so that I can count the number of circles     CircleComponent(int northward)    {                  /**         Constructs a circle n times, based on user input, in random locations with random bore.         */              hlp=n; // hlp gets the value of n, that is i in CircleViewr.coffee            }                                              	public void paintComponent(Graphics g)       	    {               Random generator = new Random(); //I create generator here instead of the constructor                          //Recover Graphics2D                         Graphics2D g2 = (Graphics2D) 1000;                                                                //Draw the circle                    for(int i=0;i<hlp;i++)//I apply for loop so That i could repeat the drawing hlp times                    {                    	/*Encounter the genetartor.nextInt()%100+100 I use it to generate me some random locations*/                    	Ellipse2D.Double circumvolve = new Ellipse2D.Double(generator.nextInt()%100+100, generator.nextInt()%100+100, 50, 50);                         g2.draw(circumvolve);                           //System.out.println(generator.nextInt()%100+100);                    }                                                                                }          }            

and the Viewer Code:

import javax.swing.JFrame; import coffee.util.Scanner; import javax.swing.JLabel;  /**    */ public class CircleViewer {    public static void principal(Cord[] args)         {                          		 Scanner in = new Scanner(Organisation.in);                                      System.out.println("Enter the number of circles you want to see  ");                 System.out.print("(Please enter an integer between ane and 20):  ");                 int i = in.nextInt();                                                      JFrame frame2 = new JFrame();       			frame2.setSize(800, 800);            		frame2.setTitle("Circle Viewer");                 frame2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);          		          		/*You need to pass the input of the user so that it could go to the constructor and            		*then to the for loop when you count the circles*/                		CircleComponent component = new CircleComponent (i);                   frame2.add(component);                                              		frame2.setVisible(true);                          }     }            

I hope this will assist you lot larn!

#3 wpdaddy7

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Re: Random Circle Generator with user input

Posted 06 April 2010 - 08:55 AM

Thanks for the aid. I accept a problem with the input of (i) into the line:

CircleComponent component = new CircleComponent(i);            

It returns this mistake lawmaking:

CircleViewer.coffee:23: cannot find symbol
symbol : constructor CircleComponent(int)
location: class CircleComponent
CircleComponent component = new CircleComponent(i);

This fault goes abroad when I remove the (i) but and so no circle is present when the plan runs. Prior to inserting the

generator.nextInt()%100+100            

in the CircleComponent I was seeing at least one circle appear when I ran the programme. now I am seeing nada.

???

#iv Dogstopper

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Re: Random Circle Generator with user input

Posted 06 Apr 2010 - 03:41 PM

A constructor has no render blazon...

public class CircleComponent extends JComponent {    /**    Constructs a CircleComponent that draws a given number of circles.    @param n the number of circles to describe.    */    public CircleComponent(int n)    {                                     this.northward = north;                   // This ceases to exist beyond this method/constructor                 Random generator = new Random();            }                     int due north = one;            

As you can come across, i prepare the object'due south "n" variable (this.n) to the "n" passed to the method. Also, the Random object needs to be an instance variable to use elsewhere.

#5 wpdaddy7

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Re: Random Circumvolve Generator with user input

Posted 06 April 2010 - 06:02 PM

Cheers for the assistance. I am at present seeing random circles. I was able to gear up that problem and I at present accept circles with random size and location. Still, I am non getting the input in the viewer to dictate the number of circles. I will post the updated code below.

Component Code

import javax.swing.JComponent; import javax.swing.JPanel; import java.awt.Graphics; import java.awt.Graphics2D; import java.util.Random; import java.awt.geom.Ellipse2D; import javax.swing.JFrame; import java.util.*;   /** A CircleComponent draws a number of random circles. */ public class CircleComponent extends JComponent {    /**    Constructs a CircleComponent that draws a given number of circles.    @param n the number of circles to draw.    */ 	 	int nu;  //I employ this to pass the user input, n, through the loop. 	    public void CircleComponent(int due north)    { 	 	   //Constructs a circle n times, based on user input, in random locations with random bore. 	    		int i=northward; //Gets the value of n, for utilise in CircleViewer. 		    } 	    		public void paintComponent(Graphics g)       { 	      //Create random generator 			Random generator = new Random();	 			  			//Recover Graphics2D 	   	Graphics2D g2 = (Graphics2D) grand;   		 			//Construct the loop allowing the input from the user, hlp, to be used as a parameter. 			for(int n=one;n<=20;north++) 			{ 		      //Draw the circle with random locations and random size available. 			   Ellipse2D.Double circle = new Ellipse2D.Double(generator.nextInt()%200+200,generator.nextInt()%200+200,generator.nextInt()%100+100,generator.nextInt()%100+100); 	         g2.draw(circumvolve);  			}  		      		  		} }            

Viewer Code

import javax.swing.JComponent; import javax.swing.JPanel; import java.awt.Graphics; import java.awt.Graphics2D; import java.util.Random; import java.awt.geom.Ellipse2D; import javax.swing.JFrame; import coffee.util.*;   /** A CircleComponent draws a number of random circles. */ public class CircleComponent extends JComponent {    /**    Constructs a CircleComponent that draws a given number of circles.    @param n the number of circles to draw.    */ 	 	int nu;  //I apply this to pass the user input, n, through the loop. 	    public void CircleComponent(int due north)    { 	 	   //Constructs a circle n times, based on user input, in random locations with random diameter. 	    		int i=northward; //Gets the value of due north, for use in CircleViewer. 		    } 	    		public void paintComponent(Graphics g)       { 	      //Create random generator 			Random generator = new Random();	 			  			//Recover Graphics2D 	   	Graphics2D g2 = (Graphics2D) one thousand;   		 			//Construct the loop assuasive the input from the user, hlp, to exist used equally a parameter. 			for(int northward=1;n<=20;due north++) 			{ 		      //Draw the circumvolve with random locations and random size available. 			   Ellipse2D.Double circle = new Ellipse2D.Double(generator.nextInt()%200+200,generator.nextInt()%200+200,generator.nextInt()%100+100,generator.nextInt()%100+100); 	         g2.describe(circle);  			}  		      		  		} }            

Thanks for the help. This is my first time doing whatsoever programming. I have been learning Coffee for about x weeks now and it is nevertheless a little foreign to me.

ingallsroys1977.blogspot.com

Source: https://www.dreamincode.net/forums/topic/166377-random-circle-generator-with-user-input/

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