Figuring out where a mouse click is under an image

I want to create a JFrame (or JPanel) where the whole area is one big gif (or icon etc) and I want to make some areas of this panel react to mouse clicks and other areas display messages.
There are two ways that I can think of doing this.
The first is that I figure out the x and y coordinates of each area and check to see if each mouse click is within that area.
The second way is to see if I can figure out how to put something like transparent JButtons over the areas that I want to accept mouse clicks (all the areas will be rectangular) and just do what JButtons do normally.
The second way sounds easier but I don't know how to do that.
Does anyone have opinions on which way I should do it?
Thanks

To me the first method sounds eaiser.
A third possible idea? Add a bunch of JPanels to the frame and have split the image into several pieces that are painted by each JPanel. Then use a mouse listener to detect clicks. (Seems easier than trying to make JButton transparent and placing it at the correct point).

Similar Messages

Newbie for the life of me can't figure out where in contact.php you tell it where to send form?

Thx for any help.
I know it's got to be so obbvious.
Why would you send in php vs html?
<?php
if(!$_POST) exit;
$email = $_POST['email'];
//$error[] = preg_match('/\b[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b/i', $_POST['email']) ? '' : 'INVALID EMAIL ADDRESS';
if(!eregi("^[a-z0-9]+([_\\.-][a-z0-9]+)*" ."@"."([a-z0-9]+([\.-][a-z0-9]+)*)+"."\\.[a-z]{2,}"."$",$email )){
$error.="Invalid email address entered";
$errors=1;
if($errors==1) echo $error;
else{
$values = array ('name','email','message');
$required = array('name','email','message');
$your_email = "[email protected]";
$email_subject = "New Message: ".$_POST['subject'];
$email_content = "new message:\n";
foreach($values as $key => $value){
 if(in_array($value,$required)){
if ($key != 'subject' && $key != 'company') {
 if( empty($_POST[$value]) ) { echo 'PLEASE FILL IN REQUIRED FIELDS'; exit; }
$email_content .= $value.': '.$_POST[$value]."\n";
if(@mail($your_email,$email_subject,$email_content)) {
echo 'Message sent!';
} else {
echo 'ERROR!';
?>

Thanks. I'm working with different hosts and I guess thats where the confusion for me is coming in. In bluehost, I simply submit my form through form action to http://www.bluehost/bluemail. With the php form construction it 's form action is contact.php. Does this mean that the server I'm working with will uinderstand how to process contact.php and where to send it based on paramaters previously submitted? Or do I instruct the server via the php form? Thanks again
Date: Wed, 8 Feb 2012 13:50:11 -0700
From: [email protected]
To: [email protected]
Subject: Newbie for the life of me can't figure out where in contact.php you tell it where to send form?
 Re: Newbie for the life of me can't figure out where in contact.php you tell it where to send form?
 created by mhollis55 in Dreamweaver - View the full discussion
The reason why this is done in php is because php is server-side scripting. It's telling your server to do stuff. HTML doesn't tell your server anything, it tells the client (the web browser loading it) to do things. Only your server can send an email.
 Replies to this message go to everyone subscribed to this thread, not directly to the person who posted the message. To post a reply, either reply to this email or visit the message page: http://forums.adobe.com/message/4194407#4194407
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 Start a new discussion in Dreamweaver by email or at Adobe Forums
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Can't figure out where NullPointerException is coming from

I will attach the code I have below. It is almost entirely done but i am getting a NullPointerException that is driving me nuts, and I can't figure out were it is coming from.
Help is greatly appreciated.
First code:
import java.util.Scanner;
import java.io.*;
import java.util.Random;
import java.util.Collection;
public class DistributionPlagiarist
 public static void main(String[] args) throws IOException
 Scanner keyboard = new Scanner(System.in);
 int keyLength=0, phraseLength=0, numberOfPhrases=0;
 String inputFileName="", keepReadingFromFile="", theFile="";
 FrequencyLibrary text = new DenseFrequencyLibrary();
 if(args.length != 4)
 System.out.println("The command line arguments you entered do not match what is needed. Please try again.");
 System.exit(0);
 for(int count=0; count<args.length; count++)
 keyLength = Integer.parseInt(args[0]);
 phraseLength = Integer.parseInt(args[1]);
 numberOfPhrases = Integer.parseInt(args[2]);
 inputFileName = args[3];
 if(keyLength < 0)
 while(keyLength < 0)
 System.out.print("The length of the key (" + keyLength + ")" + " you entered is less than zero.\nPlease enter another key length: ");
 keyLength = keyboard.nextInt();
 System.out.println();
 if(phraseLength < 0)
 while(phraseLength < 0)
 System.out.print("The desired length of the phrase (" + phraseLength + ")" + " you entered is less than zero.\nPlease enter another phrase length: ");
 keyLength = keyboard.nextInt();
 System.out.println();
 if(numberOfPhrases <= 0)
 while(numberOfPhrases <= 0)
 System.out.print("The desired number of phrases (" + keyLength + ")" + " you entered is not applicable.\nPlease choose another number: ");
 keyLength = keyboard.nextInt();
 System.out.println();
 File file=new File(inputFileName);
 boolean exists = file.exists();
 if (exists == false)
 while(exists == false)
 System.out.println("The file you are searching for does not exist. Please place it in this programs directory.");
 System.out.print("Please re-enter the file name: ");
 inputFileName = keyboard.nextLine();
 file=new File(inputFileName);
 exists = file.exists();
 int count=keyLength, start=0, stop=0;
 FileReader freader = new FileReader(inputFileName);
 BufferedReader inputFile = new BufferedReader(freader);
 while(keepReadingFromFile != null)
 keepReadingFromFile = inputFile.readLine();
 if(keepReadingFromFile == null)
 break;
 else
 theFile = theFile + keepReadingFromFile;
 while(count < theFile.length())
 String name = theFile.substring(start, keyLength+stop);
 char singleCharacter = theFile.charAt(count);
 text.add(name, singleCharacter);
 start++;
 stop++;
 count++;
 int countNumberOfPhrases=0;
 while(numberOfPhrases > 0)
 countNumberOfPhrases++;
 String phrase = randomphrase(text, phraseLength, keyLength);
 System.out.println("Phrase " + countNumberOfPhrases + ":\n" + phrase);
 numberOfPhrases--;
 private static String randomphrase(FrequencyLibrary textLibrary, int phraseLengthToMake, int startLength)
 String startString="";
 char characterToAdd=' ';
 startLength++;
 Random generator = new Random();
 int sizeOfLibrary=textLibrary.size()/2, randomInt = generator.nextInt(sizeOfLibrary+1), value=0;
 Collection<String> stringNames = textLibrary.makeStringCollection();
 for(String stringFromCollection : stringNames)
 if(randomInt == value)
 startString = stringFromCollection;
 value++;
 String thePhrase = new String(startString);
 System.out.println("INITIAL START:" + startString + "TTTT");
 int substringStart=1;
 while(startLength < phraseLengthToMake)
 characterToAdd = textLibrary.randomUniformChoose(startString);
 thePhrase = thePhrase + characterToAdd;
 System.out.println("CHARACTER:" + characterToAdd + "TTTT");
 System.out.println("PHRASE:" + thePhrase + "TTTT");
 startString = thePhrase.substring(substringStart, thePhrase.length());
 boolean answer = textLibrary.contains(startString);
 System.out.println(answer);
 System.out.println("NEW STRING:" + startString + "TTTT");
 startLength++;
 substringStart++;
 return thePhrase;
}Second code:
import java.util.Collection;
import java.util.HashMap;
public class DenseFrequencyLibrary implements FrequencyLibrary
 private HashMap<String, MultiSetOfChar> bookTitleAndCharacterAndIntegerHashMap = new HashMap<String, MultiSetOfChar>();
 private MultiSetOfChar keyAndValuePairs = new DenseMultiSetOfChar();
 * Creates a new DenseFrequencyLibrary with all the essential things clear;
 DenseFrequencyLibrary()
 bookTitleAndCharacterAndIntegerHashMap.clear();
 * Input the value from the creation of the DensneMultiSetOfChar into a HashMap. If the key
 * already exists then the value associated with it is updated by one.
 * @param character a char to be used in forming the HashMap
 * @return characterMap
 private HashMap<String, MultiSetOfChar> inputIntoMap(String name, char character)
 if(!bookTitleAndCharacterAndIntegerHashMap.containsKey(name))
 keyAndValuePairs = new DenseMultiSetOfChar(character);
 else
 keyAndValuePairs.add(character);
 this.bookTitleAndCharacterAndIntegerHashMap.put(name, keyAndValuePairs); //input character and value
 return bookTitleAndCharacterAndIntegerHashMap; //return the new HashMap
 * Returns the number of books in the library.
 * @return |b|, ie the number of books in b
 public int size()
 int numberOfBooks=bookTitleAndCharacterAndIntegerHashMap.size();
 return numberOfBooks;
 * Searches the library for an occurrence of a given book
 * @param target the name of a book to be searched for in the library
 * @return true if and only if the argument is already a book title in the library.
 public boolean contains(String target)
 boolean bookIsInLibrary=false;
 if(bookTitleAndCharacterAndIntegerHashMap.containsKey(target))
 bookIsInLibrary = true;
 return bookIsInLibrary;
 * Returns the MultiSetOfChar that represents the occurrences of the individual characters
 * in the text of the book indicated by the argument.
 * @param target
 * @return MultiSetOfChar
 public MultiSetOfChar getFrequencies(String target)
 MultiSetOfChar frequencyMultiSetOfChar = bookTitleAndCharacterAndIntegerHashMap.get(target);
 return frequencyMultiSetOfChar;
 * Modifies the character occurrences associated with name to include one more occurrence of element.
 * @param name string of the name of the book
 * @param element character to add to the specified book
 public void add(String name, char element)
 bookTitleAndCharacterAndIntegerHashMap = inputIntoMap(name, element);
 * Modifies the character occurrences associated with name to include one less occurrence of element.
 * @param name string of the name of the book
 * @param element character to be removed from the specified book
 * @return true if and only if the book is modified.
 public boolean remove(String name, char element)
 boolean characterWasRemovedFromBook=false;
 //if the target character is in the map then remove it
 if(bookTitleAndCharacterAndIntegerHashMap.containsKey(name))
 MultiSetOfChar keyAndValuePairs = bookTitleAndCharacterAndIntegerHashMap.get(name);
 keyAndValuePairs.remove(element);
 characterWasRemovedFromBook = true; //set answer to true because the HashMap was changed
 else //target does not exist in the HashMap
 characterWasRemovedFromBook = false; //set answer to false because the HashMap was not changed
 return characterWasRemovedFromBook;
 * Returns a random character, chosen from the same distribution as the characters appear in the book.
 * For example, if 5% of the characters in "Alice in Wonderland" are an 'A', then this method should
 * return an 'A' about 5% of the time.
 * @param name string of the name of the book to search through and remove a character
 * @return true if and only if the argument is already a book title in the library.
 public char randomUniformChoose(String name)
 MultiSetOfChar keyAndValuePairs = bookTitleAndCharacterAndIntegerHashMap.get(name);
 char randomCharacter = keyAndValuePairs.randomUniformChoose();
 return randomCharacter; //return the random character pulled out
 public Collection<String> makeStringCollection()
 Collection<String> stringCollection = bookTitleAndCharacterAndIntegerHashMap.keySet();
 return stringCollection;
}Third code:
import java.util.HashMap;
import java.util.Set;
import java.util.Collection;
import java.util.Random;
* DenseMultiSetOfChar implements MultiSetOfChar.
* @mathmodel b is a finite multiset
* @mathdef
* |b| is the cardinality of b
* ||c,b|| is the number of occurrences of element c in b
* @author Kyle Hiltner
public class DenseMultiSetOfChar implements MultiSetOfChar
 private char characterInput=' ';
 private HashMap<Character, Integer> characterMap = new HashMap<Character, Integer>();
 * Create a new DenseMultiSetOfChar with zero argument
 DenseMultiSetOfChar()
 characterMap.clear(); //clear static HashMap
 * Create a new DenseMultiSetOfChar with the passed in value.
 * @param newChar character input to be added to the HashMap
 DenseMultiSetOfChar(char newChar)
 this.characterInput = newChar; //set characterInput to the value passed in
 characterMap = inputIntoMap(this.characterInput); //call private procedure to add characterInput to HashMap
 * Input the value from the creation of the DensneMultiSetOfChar into a HashMap. If the key
 * already exists then the value associated with it is updated by one.
 * @param character a char to be used in forming the HashMap
 * @return characterMap
 private HashMap<Character, Integer> inputIntoMap(char character)
 //if the character is not in the HashMap then add it with the starting value of 1
 if(!characterMap.containsKey(character))
 characterMap.put(character, 1); //input character and value
 else //character does exist
 int value = characterMap.get(character); //get the value for the specified key
 value++; //increase the value so as to show that another character was added
 characterMap.put(character, value); //place the character and new value in the HashMap
 return characterMap; //return the new HashMap
 * Returns the number of elements in this multiset (ie its cardinality).
 * Note that since multisets can include duplicates, the cardinality may be
 * larger than the number of distinct elements. Also, the total number of
 * items in the multiset is bounded above by Integer.MAX_VALUE.
 * @return |b|, ie the cardinality of b
 public int getCardinality()
 int totalElementsInMap=0;
 Collection<Integer> integerCollection = characterMap.values(); //create a collection for easy iteration
 //iterate through each value in the HashMap and compute the total number of elements in the HashMap
 for(Integer valueFromCollection : integerCollection)
 totalElementsInMap = totalElementsInMap + valueFromCollection; //compute new value of total values
 return totalElementsInMap; //return the final total value
 * Returns the number of occurrences of a given element in the multiset. A
 * simple identity relating getElementCount and getCardinality is that the
 * sum of getElementCount for each char is equal to the cardinality of the
 * set.
 * @param target
 * char to be counted in the multiset
 * @return ||target,b||, ie the number of occurrences of target in b
 public int getElementCount(char target)
 int numberOfGivenCharacters=0; //set initial value
 //if the HashMap contains the target character then numberOfGivenCharacters is set to the value
 if(characterMap.containsKey(target))
 numberOfGivenCharacters = characterMap.get(target); //set numberOfGivenCharacters to the value assigned to the target character
 return numberOfGivenCharacters; //return the value for the target character
 * Returns a set such that every element in the multiset is in the set (but
 * no duplicates). The cardinality of the returned set must be less than or
 * equal to |b|. The cardinality of the two are equal if and only if b
 * contains no duplicate elements.
 * @return a set of Character, s, such that: 
 * (for all (Character)i in s : (char)i in b) and 
 * (for all (char)i in b : (Character)i in s)
 public Set<Character> getElementSet()
 Set<Character> characterSet = characterMap.keySet(); //create a Set from the keys of characters in the HashMap
 return characterSet; //return the character Set
 * Adds a single element to the multiset. This operation always increases
 * the cardinality of the multiset by 1, assuming that the maximum capacity
 * of Integer.MAX_VALUE has not been reached.
 * @param item
 * the char to be added to b
 * @requires |b| < Integer.MAX_VALUE
 * @alters b
 * @ensures b = #b union {item}
 public void add(char item)
 characterMap = inputIntoMap(item); //call the private method to add new character (item) to the HashMap
 * Removes the target, if it is present in the multiset. The method returns
 * true if and only if it changes the multiset.
 * @param target
 * the char to be removed
 * @alters b
 * @ensures (target not in #b) ==> (b = #b) 
 * (target in #b) ==> (b union {target} = #b)
 * @return target in #b
 public boolean remove(char target)
 boolean answer=false; //set initial value to false
 //if the target character is in the map then remove it
 if(characterMap.containsKey(target))
 int value = characterMap.get(target); //find the value associated with the target character
 //if the value is 1 call remove from the HashMap and remove key and value
 if(value == 1)
 characterMap.remove(target); //remove key and value from the HashMap
 else //value is greater than 1
 value--; //decrease value to show removal
 characterMap.put(target, value); //replace target character with new value back into the HashMap
 answer = true; //set answer to true because the HashMap was changed
 else //target does not exist in the HashMap
 answer = false; //set answer to false because the HashMap was not changed
 return answer; //return answer
 * Returns a char chosen randomly based on the contents of the multiset.
 * This operation does not remove the char from the multiset or change the
 * multiset in any way. In particular, the cardinality of the multiset is
 * the same before and after this method.
 * 
 * Characters should be returned with a random distribution equal to the
 * distribution of characters in the multiset. That is, for a character that
 * appears N times in a multiset of cardinality M, the probability of that
 * character being returned is N / M. For example, a multiset that contains
 * only the character 'a', possibly many times, would always result in an
 * 'a' being generated. On the other hand, a multiset with an equal number
 * of 'a' and 'b' elements would return an 'a' approximately half the time
 * and a 'b' the other half.
 * @requires |b| >= 1
 * @return char c with probability p, where: 
 * p = ||c,b|| / |b|
 public char randomUniformChoose()
 char randomCharacter=' ';
 Random generator = new Random();
 int totalElementsInMap=0;
 Collection<Integer> integerCollection = characterMap.values(); //create a collection for easy iteration
 //iterate through each value in the HashMap and compute the total number of elements in the HashMap.
 //Do this in case a remove call was made
 for(Integer valueFromCollection : integerCollection)
 totalElementsInMap = totalElementsInMap + valueFromCollection; //compute new value of total values
 int randomInt = generator.nextInt(totalElementsInMap+1), lowerValue=0, upperValue=0;
 Collection<Character> keyCollection = characterMap.keySet();
 //iterate through each value in the HashMap and compute the total number of elements in the HashMap
 for(Character keyFromCollection : keyCollection)
 upperValue = upperValue + characterMap.get(keyFromCollection);
 if(randomInt == upperValue)
 randomCharacter = keyFromCollection;
 if(randomInt >= lowerValue && randomInt <= upperValue)
 randomCharacter = keyFromCollection;
 lowerValue = upperValue + 1;
 return randomCharacter; //return the random character pulled out
}The Error:
Exception in thread "main" java.lang.NullPointerException
 at DenseFrequencyLibrary.randomUniformChoose(DenseFrequencyLibrary.java:137)
 at DistributionPlagiarist.randomphrase(DistributionPlagiarist.java:146)
 at DistributionPlagiarist.main(DistributionPlagiarist.java:112)I will attempt to explain what this does in as few words as possible. For a breakdown of the lab go urlhttp://www.cse.ohio-state.edu/~paolo/teaching/494MJ/labs/lab8.shtml{url}. If you don't feel like reading that: THe program reads in some command line arguments. From there it reads from the file provided in the command line and creates "keys" from the specified length. From there I need to create a phrase of the specified length. If i am supposed to create more then one then i do. That is pretty much it. I can't figure out where (really why) the NullPointerException error is coming from.
Help is appreciated!!

Post the actual error text (copy and paste, don't "interpret" it) here.
It should include a stack trace which references a line number of the program -
unless you suppressed the trace, in which case change your error handling
so that the trace is produced.
Identify which program line in your post the error is pointing to so that we can match
the error with your program, since your post doesn't have line numbers..
Edited by: ChuckBing on Nov 16, 2007 7:19 PM
Also - posting large amounts of code (as you did) will reduce the chance of anyone helping

It keeps saying my hard drive is almost full even though I delete as much as possible and use an external hard drive, cant figure out where else I need to look?

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Model Identifier:          MacBookPro5,5
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Number Of Processors:          1
Total Number Of Cores:          2
L2 Cache:          3 MB
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Is there somewhere to look to see a breakdown of what memory is used where?
Thanks for your help!

How can I figure out where are the heaviest volumes in order to get rid of the useless stuff?.

How can I figure out where are the heaviest volumes in order to get rid of the useless stuff?.

How about a few specific NOUNs to replace the vague references you have made. A little context.
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What sort of STUFF are you trying to eliminate ?

Help me figure out where to start learning flex/flash/air/etc.

Hi all,
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What is a good learning path for those tools?
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For creating a web application using Flash, there are broadly two workflows (with different tools to use):
If you are a designer, you may want to start learning Adobe Flash Professional for a more design oriented feel application development:
http://www.adobe.com/products/flash/
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If you are a developer you would generally find Flex more natural because it allows you to code your application. For this you can use the Adobe opensource Software development kit or Adobe Flash Builder The Flash Builder IDE comes with support for intelligent coding, debugging, and visual design and features powerful testing tools that speed up development and lead to higher performing applications.
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http://www.adobe.com/devnet/flex/videotraining/
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See:
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Restore from backup. See:
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Have you got iChat. There have been examples where this was the cause. If you have, turn it off to check. You could also go to activity monitor to check what parts of you system are active.

Extra spacing - can't figure out where it is coming from.

Hello,
I am trying to close the gap between the sentence "We can cover your overdrafts in two different ways" and the actual two points. I can not figure out where all that space is coming from:
http://www.tellgcu.com/melanie.shefchik
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The space is there as a result of the default margin/padding on the .mainbody paragraph tag.
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font-family: Verdana, Geneva, sans-serif;
font-size: 10px;
padding: 0 0 10px 0;
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An overdraft occurs when you do not have enough money in your account to cover a transaction, but we pay it
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Can't figure out where "up arrow" command on Mac for keyboard shortcuts.

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michael60 wrote:
Many, many thanks.
In my Java Prefs App I unchecked
J2SE 5.0
J2SE 1.4.2 was already unchecked.
Did I get this right?
Wasnt sure if I was was disabling Java or Java Script here....
That is Java. Those are also really old versions. You can actually keep them turned on in Java Preferences.
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Figuring out System's Double-clicking speed

Hi everybody!
I have a task to implement event handling. I would like to know how I can find out the double-clicking speed of the underlying system.
This would be the short description. Here some background for those interested: I am aware, that I do get double-click events by the system, but I need to detect triple, quatro and so on clicks, too. Thus, I accumulate the mouse pressed / mouse released events and start a timer that gives me a time out, after which I send the real event to the next layer. I, thus, need to figure out the system's double-click speed in order to set the timeout correctly.
Any help will be greatly appreciated!
Thanks
PI

I don't think you can. Supposedly this is because it's OS dependant. What if you are on an OS that doesn't use a mouse. DOS for example. Whatever would they return?
Oh, I don't know, hmmmm, maybe... Satan!
(or zero)
Anyways, maybe you could track the separate clicks yourself and time the interval between them and use your own double click speed. Just an idea. Otherwise, it's System.exec() with some small .exe or JNI.

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