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Here is the source code for the SmashTransition class:
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import javaawt*; import javaawtimage*; public class SmashTransition extends BillTransition { final static int CELLS = 8; final static float FOLDS = 80f; static int[] fill_pixels; static void setupFillPixels(int width) { if(fill_pixels != null && fill_pixelslength <= width) { return; } fill_pixels = new int[width]; for(int f = 0; f < width; ++f) { fill_pixels[f] = 0xFFFFFFFF; }
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int drop_amount; int location; public void init(Component owner, int[] current, int[] next) { init(owner, current, next, CELLS, 160); setupFillPixels(cell_w); drop_amount = (cell_h / CELLS) * cell_w; location = pixels_per_cell - ((cell_h / CELLS) / 2) * cell_w; for(int c = CELLS - 1; c >= 0; c) { try { Threadsleep(100); } catch (InterruptedException e) {} Smash(c + 1); try { Threadsleep(150); } catch (InterruptedException e) {} createCellFromWorkPixels(c); location -= drop_amount; } work_pixels = null; } void Smash(int max_fold) { Systemarraycopy(next_pixels, pixels_per_cell - location, work_pixels, 0, location); int height = cell_h - location / cell_w; float fold_offset_adder = (float)max_fold * FOLDS / (float)height; float fold_offset = 00f; int fold_width = cell_w - max_fold; float src_y_adder = (float)cell_h / (float)height; float src_y_offset = cell_h - src_y_adder / 2; for(int p = pixels_per_cell - cell_w; p >= location; p -= cell_w) { Systemarraycopy(fill_pixels, 0, work_pixels, p, cell_w); Systemarraycopy(current_pixels, (int)src_y_offset * cell_w, work_pixels, p + (int)fold_offset, fold_width); src_y_offset -= src_y_adder; fold_offset += fold_offset_adder; if(fold_offset < 00 || fold_offset >= max_fold) { fold_offset_adder *= -10f; }
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Here is what the smash transition looks like before, during, and after:
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TearTransitionjava
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The TearTransition creates the illusion of the current billboard getting torn off the applet like a piece of paper It gets ripped upwards and toward the left to reveal the next billboard image underneath There is only one member variable used in this transition, x_cross It is used as a multiplier to create the tear effect The larger the value of this variable, the smaller the tear effect will appear to be The code for this transition has many optimizations One optimization of significance is to create the cell frames in reverse order, building the last cell frame first and the first, last In their normal order, each subsequent cell frame reveals a little bit more of the new image underneath If the frames were to be created in the normal order, the tear effect would have to be drawn, along with the new image pixels revealed in the current frame, which had been covered by the tearing effect in the previous frame Doing it in reverse only requires redrawing the tearing effect each cell frame For example, the last frame, created first, starts out with the tearing effect using only a small portion of the upper-left corner of the image, while the rest of the pixels are taken from the new billboard image In the second to the last frame, which is created second, the new tear effect draws over a little bit more of the upper-left corner of the image, while the rest of the image remains the same The cell frames that follow draw the new tear effect over more and more of the image, but always covering up the old tear effect from the last frame
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init( )
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The init( ) method for this transition starts like all other transitions, with a call to the base class' init( ) method It then copies all of the new billboard's pixels into the work_pixels array and copies the first line of the old billboard's pixels onto the first line of the work_pixels array After the x_cross variable is initialized, the init( ) method loops through each cell frame in reverse order Inside the loop, it creates each cell frame and decreases the value of the x_cross variable
Tear( )
The Tear( ) method modifies the work_pixels array for the next cell It draws the tear effect onto the work pixels It draws the tear effect line by line To draw one line, the method copies pixels from the old image pixels into the work_pixels array It uses two counters, one that is an index into the work_pixels array, the destination, and one that references an index into the array of pixels for the old billboard, the source Both counters are started at zero The destination counter is always incremented by one The source counter, however, is incremented by a floating-point number that is always greater than one When the loop is run until the destination index is larger than the width of the line,
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the result is the source index growing faster than the destination index The overall effect is that in the destination, only a number of pixels on the left side of the image will be copied from the source The pixels taken from the source will skip some pixels, resulting in pixels taken from the source being evenly distributed across the line Each line of the cell frame will use a larger value for the floating-point number on the line above This makes lines toward the bottom draw on fewer pixels for the tear effect than lines toward the top This method has one big optimization that it uses to get around the slow array indexing in Java Whenever a element in an array is used, bounds checking is done to ensure that the index is within the bounds of the array There is a performance hit involved in this bounds checking The standard Java class, System, provides a method that allows you to copy sections of arrays from one array to another almost as fast or as fast as copying one array element into another This method is used to speed up the creation lines within the cell frames It only uses this method when the applet knows some of the source pixels will be adjacent to one another If the applet skips at least every other pixel from the source image, then it will use the standard loop method An x_increment value less than 05 indicates that less than 15 will be added to the source index counter each time, and there will be a speed benefit from using the array copy method for a particular line
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