public TreeViewer(String title, int ulx, int uly, int pw, int ph) {
super(title, ulx, uly, pw, ph);
// code to initialize instance variables before animation begins:
// ------------------------------------------------------------------
state = "regular";
spread = 1;
levelHeight = 10; // 10 levels for the camera region height
tree = new SackBST();
String fileName = FileBrowser.chooseFile(true);
try {
Scanner input = new Scanner(new File(fileName));
String s;
while (input.hasNext()) {
s = input.nextLine();
if (s != null) {
tree.add(s);
}
}
input.close();
} catch (Exception e) {
System.out.println("File load failed");
System.exit(1);
}
// code to finish setting up entire window:
// ------------------------------------------------------------------
setBackgroundColor(new Color(128, 128, 200));
// code to set up camera(s)
// ------------------------------------------------------------------
cameras.add(new Camera(10, 50, camw, camh, 0, 100, 0, new Color(255, 200, 255)));
cameras.add(new Camera(10, 50 + camh + 10, camw, 20, 0, 100, 0, new Color(255, 255, 255)));
// ------------------------------------------------------------------
// start up the animation:
super.start();
}
public void keyPressed(KeyEvent e) {
int code = e.getKeyCode();
Camera cam = cameras.get(0);
if (state.equals("regular")) {
if (code == KeyEvent.VK_L) {
cam.shiftRegion(0.25, 0);
} else if (code == KeyEvent.VK_R) {
cam.shiftRegion(-0.25, 0);
} else if (code == KeyEvent.VK_U) {
cam.shiftRegion(0, -0.25);
} else if (code == KeyEvent.VK_D) {
cam.shiftRegion(0, 0.25);
} else if (code == KeyEvent.VK_S) {
cam.scaleRegion(1.1, 1.1);
} else if (code == KeyEvent.VK_B) {
cam.scaleRegion(1 / 1.1, 1 / 1.1);
} else if (code == KeyEvent.VK_W) {
spread *= 1.1;
} else if (code == KeyEvent.VK_N) {
spread /= 1.1;
} else if (code == KeyEvent.VK_H) {
cam.setRegion(0, 100, 0, 100);
}
} // regular state
else if (state.equals("add")) {
if (code == KeyEvent.VK_ENTER) {
state = "regular";
if (!stringToAdd.equals("")) tree.add(stringToAdd);
} else if (code == KeyEvent.VK_DELETE || code == KeyEvent.VK_BACK_SPACE) {
if (stringToAdd.length() > 0)
stringToAdd = stringToAdd.substring(0, stringToAdd.length() - 1);
}
} // add state
}