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

What is the string concatenation, What is the String Concatenation + Op...

What is the String Concatenation + Operator is employed to concatenate strings - System.out.pritln ("Hello" + "World") will print Hello World on console String concatenat

Benefits of spring framework, Benefits of Spring framework : Spring can...

Benefits of Spring framework : Spring can effectively organize your middle tier objects as given in the diagram above, whether or not you select to use EJB. Applications create

What is a jsp and what is it used for?, Java Server Pages (JSP) is a platfo...

Java Server Pages (JSP) is a platform independent presentation layer technology that comes with SUN s J2EE platform. JSPs are normal HTML pages with Java code pieces embedded in th

Equation tool, i need help i hav done the gui part of my project and some s...

i need help i hav done the gui part of my project and some simple symbols but to display some complex symbols like integration and all but it shud be clear with lower and upper lim

Bluej program, program to find the frequency of a digit in a number

program to find the frequency of a digit in a number

Explain role of actionservlet , ActionServlet performs the role of Contro...

ActionServlet performs the role of Controller: ? Process user requests ? Verify what the user is trying to achieve according to the request ? Pull data from the model (if

Write a program that will analyze stocks, Write a program in java that will...

Write a program in java that will analyze stock data and purchase stock with the user''s specific risk and investment. User will select risk from a GUI, high, medium or low and inp

Compression, 1 occurrence of "oog", and 1 occurrence each of "goog", "oogo"...

1 occurrence of "oog", and 1 occurrence each of "goog", "oogo",

Develop an android app for me, Project Description: I need someone to pr...

Project Description: I need someone to prepare an android app for me and provide it to me asap. The app details to be provided on pm Skills required: Java, Android

Develope a simple polling web application, Develop a simple polling (voting...

Develop a simple polling (voting) web application according to the following specifications: Initially a page should be presented to the user where he can enter his/her name

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