Explain what is fontmetrics in java, JAVA Programming

Assignment Help:

Explain what is FontMetrics in Java?

No word wrapping is completed when you draw a string in an applet, even if you embed newlines in the string along with \n. If you expect that a string may not fit in the applet, you should possibly use a TextArea Component instead. You'll learn about text areas and other AWT Components next class. Therefore there are times when you will require concerning yourself along with how much space a particular string will occupy. You search this out with a FontMetrics object. FontMetrics permit you to determine the height, width or other useful characteristics of a particular string, character, or array of characters in a particular font.

As an example the following program expands on the DrawString applet. Previously text would run off the side of the page if the string was too long to fit in the applet. Presently the string will wrap around if essential.

In order to tell where and whether to wrap the String, you required to measure the string, not its length in characters which can be variable but rather its width and height in pixels. Measurements of this sort on strings clearly depend on the font that's used to draw the string. All other things being equal a 14 point string will be wider than the similar string in 12 or 10 point type.

To measure character and string sizes you need to look at the FontMetrics of the current font. To obtain a FontMetrics object for the current Graphics object you use the java.awt.Graphics.getFontMetrics() method. From java.awt.FontMetrics you'll need fm.stringWidth(String s) to return the width of a string within a particular font, and fm.getLeading() to obtain the appropriate line spacing for the font. There are several more methods in java.awt.FontMetrics that let you measure the heights and widths of exact characters as well as ascenders, descenders and more, but these three methods will be enough for this program.

At last you'll need the StringTokenizer class from java.util to split up the String into individual words. therefore you do required to be careful lest some annoying beta tester (or, worse yet, end user) tries to see what happens when they feed the word antidisestablishmentarianism or supercalifragilisticexpialidocious into an applet that's 50 pixels across.

import java.applet.*;
import java.awt.*;
import java.util.*;

public class WrapTextApplet extends Applet {

private String inputFromPage;

public void init() {
this.inputFromPage = this.getParameter("Text");
}

public void paint(Graphics g) {

int line = 1;
int linewidth = 0;
int margin = 5;
StringBuffer sb = new StringBuffer();
FontMetrics fm = g.getFontMetrics();
StringTokenizer st = new StringTokenizer(inputFromPage);

while (st.hasMoreTokens()) {
String nextword = st.nextToken();
if (fm.stringWidth(sb.toString() + nextword) + margin <
this.getSize().width) {
sb.append(nextword);
sb.append(' ');
}
else if (sb.length() == 0) {
g.drawString(nextword, margin, line*fm.getHeight());
line++;
}
else {
g.drawString(sb.toString(), margin, line*fm.getHeight());
sb = new StringBuffer(nextword + " ");
line++;
}

}
if (sb.length() > 0) {
g.drawString(sb.toString(), margin, line*fm.getHeight());
line++;
}

}

}


Related Discussions:- Explain what is fontmetrics in java

Design a bond class, In the lectures, we have written programs for bond pri...

In the lectures, we have written programs for bond pricing in discrete time. We have also talked about the theory for bond pricing and yields in continuous time. In this exercise,

Heap and Stack memory allocation in java, Each time an object is started in...

Each time an object is started in Java it goes into the area of memory named as heap. The primitive variables like double and int are allocated in the stack, if they are local inst

What is static in java, What is static in java? Static means one per cl...

What is static in java? Static means one per class, not one for each object no matter how many example of a class might exist. This means that you can use them without making a

Student, short Java application that stores words in an Array or ArrayList....

short Java application that stores words in an Array or ArrayList.

I want someone to fix some bugs in a java app, I want someone to fix some b...

I want someone to fix some bugs in a java app Project Description: I have a small app in java, but it has some issues, the app is running. But we need to make it work more st

Moving test, After refactor the main class to become abstract class, I want...

After refactor the main class to become abstract class, I want to move test method from tset clas of main class to subclass, how to do that?

A java gui application, Design A Word document/ report containing pro...

Design A Word document/ report containing program design documentation, including UML diagrams (Use case, class and sequence) and written descriptions of each class or module

What is testing for equality in java, What is Testing for Equality in java?...

What is Testing for Equality in java? Testing for equality is a little trickier. You would expect to test if two numbers are equal through using the = sign. However the = sign

How do i include static files within a jsp page, Static resources should al...

Static resources should always be contained using the JSP include directive. This way, the inclusion is performed just once during the translation phase. Do note that you should al

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd