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nseq = 0; while(sthasMoreTokens() && nseq < MAXSEQ) { sequence[nseq] = intDef(stnextToken(), 0); nseq++; } try { Image img = getImage(getDocumentBase(), getParameter("img")); MediaTracker t = new MediaTracker(this); taddImage(img, 0); twaitForID(0); int iw = imggetWidth(null); int ih = imggetHeight(null); int tw = iw / tilex; int th = ih / tiley; CropImageFilter f; FilteredImageSource fis; for (int y=0; y<tiley; y++) { for (int x=0; x<tilex; x++) { f = new CropImageFilter(tw*x, th*y, tw, th); fis = new FilteredImageSource(imggetSource(), f); int i = y*tilex+x; cell[i] = createImage(fis); taddImage(cell[i], i); } } twaitForAll(); } catch (InterruptedException e) { Systemoutprintln("Image Load Interrupted"); } } public void update(Graphics g) { } public void paint(Graphics g) { gdrawImage(cell[sequence[idx]], 0, 0, null); } Thread t; public void start() { t = new Thread(this); stopFlag = false; tstart(); } public void stop() { stopFlag = true; } public void run() {
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25:
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idx = 0; while (true) { paint(getGraphics()); idx = (idx + 1) % nseq; try { Threadsleep(1000/framerate); } catch (InterruptedException e) { Systemoutprintln("Animation Interrupted"); return; } if(stopFlag) return; } } }
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The following applet tag shows the famous locomotion study by Eadweard Muybridge, which proved that horses do, indeed, get all four hooves off the ground at once (Of course, you can substitute another image file in your own applet)
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<applet code=Animation width=67 height=48> <param name=img value=horsegif> <param name=rows value=3> <param name=cols value=4> <param name=sequence value=0,1,2,3,4,5,6,7,8,9,10,11> <param name=framerate value=15> </applet>
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Figure 25-12 shows the applet running Notice the source image that has been loaded below the applet using a normal <img> tag
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FIGURE 25-12
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Part II:
The Java Library
Additional Imaging Classes
In addition to the imaging classes described in this chapter, javaawtimage supplies several others that offer enhanced control over the imaging process and that support advanced imaging techniques Also available is the imaging package called javaximageio This package supports plug-ins that handle various image formats If sophisticated graphical output is of special interest to you, then you will want to explore the additional classes found in javaawtimage and javaximageio
The Concurrency Utilities
rom the start, Java has provided built-in support for multithreading and synchronization For example, new threads can be created by implementing Runnable or by extending Thread, synchronization is available by use of the synchronized keyword, and interthread communication is supported by the wait( ) and notify( ) methods that are defined by Object In general, this built-in support for multithreading was one of Java s most important innovations and is still one of its major strengths However, as conceptually pure as Java s original support for multithreading is, it is not ideal for all applications especially those that make extensive use of multiple threads For example, the original multithreading support does not provide several high-level features, such as semaphores, thread pools, and execution managers, that facilitate the creation of intensive concurrent programs It is important to explain at the outset that many Java programs make use of multithreading and are therefore concurrent For example, most applets use multithreading However, as it is used in this chapter, the term concurrent program refers to a program that makes extensive, integral use of concurrently executing threads of execution An example of such a program is one that uses separate threads to simultaneously compute the partial results of a larger computation Another example is a program that coordinates the activities of several threads, each of which seeks access to information in a database In this case, read-only accesses might be handled differently from those that require read/write capabilities To handle the needs of a concurrent program, JDK 5 added the concurrency utilities, also commonly referred to as the concurrent API The concurrency utilities supply many features that had long been wanted by programmers who develop concurrent applications For example, they offer the semaphore, cyclic barriers, countdown latches, thread pools, execution managers, locks, several concurrent collections, and a streamlined way to use threads to obtain computational results The concurrent API is quite large, and many of the issues surrounding its use are quite complex It is beyond the scope of this book to discuss all of its facets Moreover, the alternatives offered by the concurrency utilities are not designed for use by most programs Simply put: Unless you are writing programs with a significant amount of concurrency, in most cases, Java s traditional support for multithreading and synchronization is not only sufficient, but in many cases also is preferable to the capabilities offered by the concurrent API The preceding paragraph notwithstanding, it is important for all programmers to have a general, working knowledge of the concurrent API Furthermore, there are some parts of it,
Part II:
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