private static void drawDisks(ArrayList[] pegList) {
int peg, j, k;
RectShape rect = null;
// erase the previous drawing and set the line and labels
DrawTools.eraseWindow();
line.draw();
pTextA.draw();
pTextB.draw();
pTextC.draw();
// scan pegList to identify the disks on each peg; use the
// disk value set rectangle attributs using constants from
// arraysxPos, diskWidth, and color; then draw the
// disk (rectangle)
for (peg = 0; peg <= 2; peg++)
for (j = 0; j < pegList[peg].size(); j++) {
k = ((Integer) (pegList[peg]).get(j)).intValue();
rect = new RectShape(xPos[peg * 6 + k], 4 - (j * 0.5), diskWidth[k], 0.5, color[k]);
rect.draw();
}
// delay the frame 1 second
DrawTools.delayWindow(1.0);
}
public static void main(String[] args) {
// number of disks
int n = 0, i;
// enter the number of disks on the command line.
// convert args[0] to n
try {
n = Integer.parseInt(args[0]);
} catch (ArrayIndexOutOfBoundsException aiobe) {
System.err.println("***\n Enter the number of disks " + "on the command line\n***");
System.exit(1);
}
// declare a three element array for the three needles.
// each element is an ArrayList of integers that holds
// the stack of disks for each needle
ArrayList[] needleList = new ArrayList[3];
for (i = 0; i < needleList.length; i++) needleList[i] = new ArrayList();
// initialize needle = 0 to hold the n disks 0, 1, ..., n-1
for (i = 0; i < n; i++) needleList[0].add(i);
// open the drawing surface and display initial disks
DrawTools.openWindow();
drawDisks(needleList);
// call recursive function
hanoi(n, 0, 1, 2, needleList);
// view final display and close the drawing surface
DrawTools.viewWindow();
DrawTools.closeWindow();
}