Solved

Randomly scaling fillOval

Posted on 2004-10-01
22
285 Views
Last Modified: 2013-11-22
I have:

page.fillOval(x-4, y-4, 8, 8);

in the API docs I read:

fillOval
public abstract void fillOval
                          (int x,
                           int y,
                           int width,
                           int height)Fills an oval bounded by the specified rectangle with the current color.

Parameters:
x - the x coordinate of the upper left corner of the oval to be filled.
y - the y coordinate of the upper left corner of the oval to be filled.
width - the width of the oval to be filled.
height - the height of the oval to be filled.

---------------
So how might I approach randomly scaling this?

Something like:
page.fillOval*(1 + (int)(100*Math.random()));  //to scale randomly from [1-100]?????
0
Comment
Question by:smkJackstraw
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 12
  • 6
  • 4
22 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 12205113
*Where* are you scaling it?
0
 
LVL 92

Expert Comment

by:objects
ID: 12205139
double scaling = Math.random();
page.fillOval(x, y, w*scaling, h*scaling);
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 12205148
Something like:


int width = getWidth();
int height = getHeight();
int scaledWidth = (int)(Math.random() * getWidth());
int scaledHeight = (int)(Math.random() * getHeight());

fillOval(width - scaledWidth, height - scaledHeigth, scaledWidth, scaledHeight);
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 86

Assisted Solution

by:CEHJ
CEHJ earned 150 total points
ID: 12205153
>>int scaledWidth = (int)(Math.random() * getWidth());

should have been

int scaledWidth = (int)(Math.random() * width);

and same for height
0
 

Author Comment

by:smkJackstraw
ID: 12205165
So I can't scale the object as a whole, but rather need to scale the fillOval perameters?
0
 
LVL 92

Expert Comment

by:objects
ID: 12205166
if you want to centre the scaled oval then simply offset the x,y.

0
 
LVL 92

Expert Comment

by:objects
ID: 12205171
to scale the ovject as a whole you would apply a scaling transformation to the Graphics context
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 12205175
What does 'the object' refer to?
0
 
LVL 92

Expert Comment

by:objects
ID: 12205176
g2d.scale(xscale, yscale);
g2d.fillOval(...
0
 
LVL 92

Accepted Solution

by:
objects earned 350 total points
ID: 12205180
public void paintComponent(Graphics g)
{
   Graphics2D g2d = (Graphics2D) g.create();
   g2d.scale(xscale, yscale);
   g2d.fillOval(x, y, w, h);
   g2d.dispose();
}
0
 
LVL 92

Expert Comment

by:objects
ID: 12205198
any other painting you also do with that context will then also be scaled
0
 

Author Comment

by:smkJackstraw
ID: 12205235
Is there a way to add points after people respond to questions?  You both deserve the points.  I can't help but laugh watching you guys/gals battle to deliver new insite into my learning.  Give me a few minutes to digest...lol!
0
 
LVL 92

Expert Comment

by:objects
ID: 12205240
sorry, 500 is the max allowed.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 12205255
500's quite enough for this type of question ;-)
0
 

Author Comment

by:smkJackstraw
ID: 12205440
Here's where I've landed:

private int x = 50, y = 50;
private boolean mouseHere = false;
private Color c = Color.red;
private int width = getWidth();
private int height = getHeight();
private int scaleRange = 100;
private int scaledWidth = ((1 + (int)(scaleRange*Math.random())) * width);
private int scaledHeight = ((1 + (int)(scaleRange*Math.random())) * height);
private int newX, newY;

//  Random scaling of fillOval at mouse location
//  rescale in range [1-100]
public void randomScale(MouseEvent event, Graphics newOval)
{
      newX = event.getX();
      newY = event.getY();
      newOval.fillOval(x - newX, y - newY, scaledWidth, scaledHeight);
}

// Definition of the mouse listener as an inner class
//Note:  E:\depaul\docs\api\java\awt\event\AWTEventListener.html
private class ClickListener implements MouseListener
{
      // Record the location of the mouse click event
      public void mouseClicked(MouseEvent event)
      {
            x = event.getX();
            y = event.getY();
            randomColor();
            //randomScale();
            repaint();
      }
}

Now this leads me to my previous question "How do I call one method from another method in the same class?"  which I'm slowly getting my head around.  The //randomScale(); give a compile error because I have parameters in the randomScale method.  How do I call this method?

I believe I can drop the x = event.getX(); and y = event.getY(); once I can call randomScale();.

Last is there a resourse online to study examples of these types of calls?
0
 
LVL 92

Expert Comment

by:objects
ID: 12205456
you need to do your painting in your paint() method as in your previous q
0
 
LVL 92

Expert Comment

by:objects
ID: 12205464
you also need to do some reorganising a little.

your mouse listener needs to update the dimensions of the oval you need to paint, and then call repaint()
the actual painting should be done in the paintComponent() method

see the code I posted in the previous question as it should be similkiar to that.
0
 
LVL 92

Expert Comment

by:objects
ID: 12205467
0
 

Author Comment

by:smkJackstraw
ID: 12206059
Where does the .dispose come form in the previous example?  I'll be working on this over the weekend.  Having a hard time with the organization and understanding what your saying.  Pts...forthcoming.
0
 
LVL 92

Expert Comment

by:objects
ID: 12206074
dispose() fress up the resources used by the graphics context.
As it created a new instance of the context (using create()) it is also responsible for releasing the resources once they are no longer needed.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 12213028
8-)
0
 
LVL 92

Expert Comment

by:objects
ID: 12213890
(:
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Introduction This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
Viewers will learn about if statements in Java and their use The if statement: The condition required to create an if statement: Variations of if statements: An example using if statements:
This tutorial explains how to use the VisualVM tool for the Java platform application. This video goes into detail on the Threads, Sampler, and Profiler tabs.

733 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question