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Here is the source code for the BillTransition class: import javautil*; import javaawt*; import javaawtimage*; public abstract class BillTransition { static Hashtable object_table = new Hashtable(20); public Image[] cells; public int delay; Component owner; int cell_w; int cell_h; int pixels_per_cell; int[] current_pixels; int[] next_pixels; int[] work_pixels; public abstract void init(Component owner, int[] current_pixels, int[] next_pixels); final protected void init(Component owner, int[] current_pixels, int[] next_pixels, int number_of_cells, int delay) { thisdelay = delay; thisnext_pixels = next_pixels; thiscurrent_pixels = current_pixels; thisowner = owner; cells = new Image[number_of_cells]; cell_w = ownergetSize()width; cell_h = ownergetSize()height; pixels_per_cell = cell_w * cell_h; work_pixels = new int[pixels_per_cell];
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final protected void init(Component owner, int[] current_pixels, int[] next_pixels, int number_of_cells) { init(owner, current_pixels, next_pixels, number_of_cells, 120); } final void createCellFromWorkPixels(int cell) { cells[cell] = ownercreateImage( new MemoryImageSource(cell_w, cell_h, work_pixels, 0, cell_w)); ownerprepareImage(cells[cell], null); }
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The ColumnTransition class changes one image into another by drawing increasingly large columns of the new image onto the old image The column sizes increase to the left, and the same pixels are always drawn on the left side of each column This makes the billboard appear to be sliding in from behind the old billboard through vertical slots in the current billboard To create the cells for this transition, the billboard space is split up into a number of columns, each column 24 pixels wide Each of the seven image cells the transition will create will have pixels on the left side of each column from the old image and pixels on the right side from the new image The first cell that is created only starts out with the three right pixels in each column taken from the new image With each successive cell, three more pixels are filled in from the new image The last cell has only the three left pixels in each column from the old image Because the width of the image space is most likely not perfectly divisible by 24, there will be some remaining pixels remaining on the right side of the image These pixels are accounted for in each cell with the rightmost_columns_max_width and rightmost_columns_x_start variables
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init( )
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The init( ) function starts by calling the base class' init( ) method to initialize the variables contained within this base class It goes on to initialize the variables associated with the rightmost column and then copies all of the pixels from the current billboard into the work pixels The loop that follows creates all of the cell frames The nextCell( ) method changes work_pixels, and the method inherited from the BillTransition class, createCellFromWorkPixels( ), is used to convert these pixels into an image Because the process of creating the cells can be very demanding on the CPU, Robert tells the thread to sleep occasionally to allow other threads to run
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The nextCell( ) method modifies the work_pixels array for the next cell It loops through each line of the image starting from the bottom line and fills part of each column by copying pixels from the next billboard onto the work_pixels array It does not ever need to copy pixels from the old billboard, because these were already copied to the array in the init( ) method It's worth repeating that the pixel arrays used to form the images are only onedimensional Every width pixel represents one horizontal line of the image
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The Code
Here is the source code for the ColumnTransition class: import javaawt*; import javaawtimage*; public class ColumnTransition extends BillTransition { final static int CELLS = 7; final static int WIDTH_INCREMENT = 3; final static int MAX_COLUMN_WIDTH = 24; int rightmost_columns_max_width; int rightmost_columns_x_start;
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int column_width = WIDTH_INCREMENT; public void init(Component owner, int[] current, int[] next) { init(owner, current, next, CELLS, 200); rightmost_columns_max_width = cell_w % MAX_COLUMN_WIDTH; rightmost_columns_x_start = cell_w - rightmost_columns_max_ width; Systemarraycopy(current_pixels, 0, work_pixels, 0, pixels_per_cell); for(int c = 0; c < CELLS; ++c) { try { Threadsleep(100); } catch (InterruptedException e)
NextCell(); try { Threadsleep(100); } catch (InterruptedException e) createCellFromWorkPixels(c); column_width += WIDTH_INCREMENT;
} work_pixels = null;
void NextCell() { int old_column_width = MAX_COLUMN_WIDTH - column_width; for(int p = pixels_per_cell - cell_w; p >= 0; p -= cell_w) { for (int x = 0; x < rightmost_columns_x_start; x += MAX_COLUMN_WIDTH) { Systemarraycopy(next_pixels, x + p, work_pixels, old_column_width + x + p, column_width); } if(old_column_width <= rightmost_columns_max_width) { Systemarraycopy(next_pixels, rightmost_columns_x_start + p, work_pixels, rightmost_columns_x_start + old_column_width + p - 1, rightmost_columns_max_width old_column_width + 1); } } } } Here is what the column transition looks like before, during, and after:
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