- #Can you put a picture in bluej program how to#
- #Can you put a picture in bluej program full#
- #Can you put a picture in bluej program series#
In this case, every time the Animate loop goes around once, a different image should be shown.
Use repaint() any time you know something has changed and thedisplay needs to be changed to bring it up to date. This statement requests that theapplet's paint() method be called so that the screen can beupdated. The first thing that happens in the while loop is a call to theapplet's repaint() method. A while (runner = thisThread) statement in Line44 causes Lines 45≥1 to loop until something causes these two Thread objects to have different values. Loading and Displaying ImagesĪs with most threaded programs, the run() method contains the mainpart of the program. The pause variable keeps track of the number of millisecondsto pause after displaying each image in an animation. Because all parameters from a Web page are received as strings, the Integer.parseInt() method is needed to convert the text into aninteger. The speed of the animation is specified by a "pause"parameter. If less than six image files have beenspecified by parameters, the Animate applet will determine this duringthe init() method when imageText equals null afterLine 15. The totalPicture integer variable determines how many differentimages will be displayed in an animation. The maximum number of images that can be displayed by thisapplet is six, but you could raise this number by making changes to Lines 6 and13. Theparameters should have names starting at "image0" and endingat the last image of the animation, such as "image3" in thishour's example. The Animate applet retrieves images as parameters on a Web page. The Thread.sleep() method is an effective wayto determine how long each image should be displayed before the next image isshown. The Animate program uses the same threaded applet structure that youused during Hour 19, "Creating a Threaded Program." Threads are alsouseful in animation programming because they give you the ability to control thetiming of the animation. Without threads, animation often takes up so much of the Javainterpreter's time that the rest of a program's graphical userinterface is sluggish to respond. This becomes especially important in a Swingprogram that must be able to respond to user input while an animation is takingplace.
#Can you put a picture in bluej program full#
Listing 24.1 The Full Text of Animate.java 1: import java.awt.* 2: 3: public class Animate extends 4: implements Runnable īecause animation is usually a process that continues over a period of time,the portion of the program that manipulates and animates images should bedesigned to run in its own thread. EnterListing 24.1 into the file, and remember to save the file when you're doneentering the text. Several details about the animation will be customizable withparameters, so you can replace any images of your own for those provided forthis example.Ĭreate a new file in your word processor called Animate.java.
#Can you put a picture in bluej program series#
The first program you will be writing today uses a series of image files tocreate an animated picture of the Anastasia Island Lighthouse in St.
You can do this to simulate motion or tocreate some other effect. JPG files that are displayedin the same place in a certain order. Many animations on Web pages are a seriesof image files, usually. Using the update() method to reduce flickering problemsĮstablishing rules for the movement of an imageĬomputer animation at its most basic consists of drawing an image at aspecific place, moving the location of the image, and telling the computer toredraw the image at its new location. The following topics will be covered:Ĭycling through an image array to produce animation For the last hour on Java'smultimedia capabilities, and the last hour of the book, you will learn how todisplay image files in GIF and JPEG formats in your programs and present them inanimated sequences.
#Can you put a picture in bluej program how to#
Unfortunately, SamsPublishing declined my request to buy you a pony, so the best I can offer as areward is the most entertaining subject in the book: animation.Īt this point, you have learned how to use text, fonts, color, lines,polygons, and sound in your Java programs. Whether you are reading this book in 24 one-hour sessions or in a single24-hour-long-bring-me-more-coffee-can't-feel-my-hand-are-you-going-to-finish-that-donutmarathon, you deserve something for making it all this way. Sams Teach Yourself Java 2 in 24 Hours, 3rd Edition
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